diff --git a/.python-version b/.python-version deleted file mode 100644 index 24ee5b1..0000000 --- a/.python-version +++ /dev/null @@ -1 +0,0 @@ -3.13 diff --git a/Makefile b/Makefile index 93178b4..aa0e6f2 100644 --- a/Makefile +++ b/Makefile @@ -5,7 +5,7 @@ lint: flake8 . test: - pytest --cov context_async_sqlalchemy exmaples/fastapi_example/tests --cov-report=term-missing + pytest --cov context_async_sqlalchemy examples/fastapi_example/tests --cov-report=term-missing uv: uv sync diff --git a/README.md b/README.md index 181669a..e6140fc 100644 --- a/README.md +++ b/README.md @@ -2,11 +2,30 @@ [![PyPI](https://img.shields.io/pypi/v/context-async-sqlalchemy.svg)](https://pypi.org/project/context-async-sqlalchemy/) +[DOCUMENTATION](https://krylosov-aa.github.io/context-async-sqlalchemy/) -ContextVar + async sqlalchemy = happiness. +Provides a super convenient way to work with sqlalchemy in asynchronous +applications. It takes care of the issues of managing the lifecycle of engine, +session, and transactions without being a wrapper. + +The main task is to get quick and easy access to the session and not worry +about when to open and when to close it. + +The key features are: + +- Super easy to use +- Automatically manages the lifecycle of engine, session, and transaction +(autocommit/autorollback) +- It doesn't interfere with manually opening and closing sessions and +transactions when needed. +- Does not depend on the web framework +- It is not a wrapper over sqlalchemy +- It is convenient to test +- Host switching in runtime +- It can manage multiple databases and multiple sessions to a single database +- Provides tools for concurrent sql queries +- Lazy initialization is everywhere -A convenient way to configure and interact with async sqlalchemy session - through context in asynchronous applications. ## What does usage look like? @@ -14,271 +33,41 @@ A convenient way to configure and interact with async sqlalchemy session from context_async_sqlalchemy import db_session from sqlalchemy import insert -from database import master # your configured connection to the database +from database import connection # your configured connection to the database from models import ExampleTable # just some model for example async def some_func() -> None: # Created a session (no connection to the database yet) - # If you call db_session again, it will return the same session - # even in child coroutines. - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values(text="example_with_db_session") # On the first request, a connection and transaction were opened await session.execute(stmt) - - # The commit and closing of the session will occur automatically -``` - - -## How to use - -The repository includes an example integration with FastAPI, -which describes numerous workflows. -[FastAPI example](https://github.com/krylosov-aa/context-async-sqlalchemy/tree/main/exmaples/fastapi_example/routes) - - -It also includes two types of test setups you can use in your projects. -The library currently has 90% test coverage. The tests are in the -examples, as we want to test not in the abstract but in the context of a real -asynchronous web application. - -[FastAPI tests example](https://github.com/krylosov-aa/context-async-sqlalchemy/tree/main/exmaples/fastapi_example/tests) - -### The most basic example - -#### 1. Configure the connection to the database - -for example for PostgreSQL database.py: -```python -from sqlalchemy.ext.asyncio import ( - async_sessionmaker, - AsyncEngine, - AsyncSession, - create_async_engine, -) - -from context_async_sqlalchemy import DBConnect - - -def create_engine(host: str) -> AsyncEngine: - """ - database connection parameters. - """ - # In production code, you will probably take these parameters from env - pg_user = "krylosov-aa" - pg_password = "" - pg_port = 6432 - pg_db = "test" - return create_async_engine( - f"postgresql+asyncpg://" - f"{pg_user}:{pg_password}" - f"@{host}:{pg_port}" - f"/{pg_db}", - future=True, - pool_pre_ping=True, - ) - - -def create_session_maker( - engine: AsyncEngine, -) -> async_sessionmaker[AsyncSession]: - """session parameters""" - return async_sessionmaker( - engine, class_=AsyncSession, expire_on_commit=False - ) - - -master = DBConnect( - host="127.0.0.1", - engine_creator=create_engine, - session_maker_creator=create_session_maker, -) - -``` - -#### 2. Manage Database connection lifecycle -Configure the connection to the database at the begin of your application's life. -Close the resources at the end of your application's life - - -Example for FastAPI: - -```python -from contextlib import asynccontextmanager -from typing import Any, AsyncGenerator -from fastapi import FastAPI - -from database import master - - -@asynccontextmanager -async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]: - """Database connection lifecycle management""" - yield - await master.close() # Close the engine if it was open -``` - - -#### 3. Setup context lifetime - -For a contextual session to work, a context needs to be set. This assumes some -kind of middleware. - - -You can use ready-made FastAPI middleware: -```python -from fastapi import FastAPI -from context_async_sqlalchemy import add_fastapi_db_session_middleware - -app = FastAPI() - -add_fastapi_db_session_middleware(app) -``` - - -I'll use FastAPI middleware as an example: -```python -from fastapi import Request -from starlette.middleware.base import ( # type: ignore[attr-defined] - Response, - RequestResponseEndpoint, -) - -from context_async_sqlalchemy import ( - init_db_session_ctx, - is_context_initiated, - reset_db_session_ctx, - auto_commit_by_status_code, - rollback_all_sessions, -) - - -async def fastapi_db_session_middleware( - request: Request, call_next: RequestResponseEndpoint -) -> Response: - """ - Database session lifecycle management. - The session itself is created on demand in db_session(). - - Transaction auto-commit is implemented if there is no exception and - the response status is < 400. Otherwise, a rollback is performed. - - But you can commit or rollback manually in the handler. - """ - # Tests have different session management rules - # so if the context variable is already set, we do nothing - if is_context_initiated(): - return await call_next(request) - - # We set the context here, meaning all child coroutines will receive the - # same context. And even if a child coroutine requests the - # session first, the dictionary itself is shared, and this coroutine will - # add the session to dictionary = shared context. - token = init_db_session_ctx() - try: - response = await call_next(request) - await auto_commit_by_status_code(response.status_code) - return response - except Exception: - await rollback_all_sessions() - raise - finally: - await reset_db_session_ctx(token) -``` - - -#### 4. Write a function that will work with the session - -```python -from sqlalchemy import insert - -from context_async_sqlalchemy import db_session - -from database import master -from models import ExampleTable - - -async def handler_with_db_session() -> None: - """ - An example of a typical handle that uses a context session to work with - a database. - Autocommit or autorollback occurs automatically at the end of a request - (in middleware). - """ - # Created a session (no connection to the database yet) + # If you call db_session again, it will return the same session # even in child coroutines. - session = await db_session(master) - - stmt = insert(ExampleTable).values(text="example_with_db_session") - - # On the first request, a connection and transaction were opened + session = await db_session(connection) + + # The second request will use the same connection and the same transaction await session.execute(stmt) -``` - - -## Master/Replica or several databases at the same time - -This is why `db_session` and other functions accept `DBConnect` as input. -This way, you can work with multiple hosts simultaneously, -for example, with the master and the replica. - -libpq can detect the master and replica to create an engine. However, it only -does this once during creation. This handler helps change the host on the fly -if the master or replica changes. Let's imagine that you have a third-party -functionality that helps determine the master or replica. - -In this example, the host is not set from the very beginning, but will be -calculated during the first call to create a session. -```python -from context_async_sqlalchemy import DBConnect - -from master_replica_helper import get_master, get_replica - - -async def renew_master_connect(connect: DBConnect) -> None: - """Updates the host if the master has changed""" - master_host = await get_master() - if master_host != connect.host: - await connect.change_host(master_host) - - -master = DBConnect( - engine_creator=create_engine, - session_maker_creator=create_session_maker, - before_create_session_handler=renew_master_connect, -) - - -async def renew_replica_connect(connect: DBConnect) -> None: - """Updates the host if the replica has changed""" - replica_host = await get_replica() - if replica_host != connect.host: - await connect.change_host(replica_host) - - -replica = DBConnect( - engine_creator=create_engine, - session_maker_creator=create_session_maker, - before_create_session_handler=renew_replica_connect, -) + # The commit and closing of the session will occur automatically ``` -## Testing - -The library provides several ready-made utils that can be used in tests, -for example in fixtures. It helps write tests that share a common transaction -between the test and the application, so data isolation between tests is -achieved through fast transaction rollback. - +## How it works -You can see the capabilities in the examples: +Here is a very simplified diagram of how everything works: -[Here are tests with a common transaction between the -application and the tests.](https://github.com/krylosov-aa/context-async-sqlalchemy/blob/main/exmaples/fastapi_example/tests/transactional/__init__.py) +![basic schema.png](docs_sources/docs/img/basic_schema.png) +1. Before executing your code, the middleware will prepare a container in +which the sessions required by your code will be stored. +The container is saved in contextvars +2. Your code accesses the library to create new sessions and retrieve +existing ones +3. After your code, middleware will automatically commit or roll back open +transactions. Closes open sessions and clears the context. -[And here's an example with different transactions.](https://github.com/krylosov-aa/context-async-sqlalchemy/blob/main/exmaples/fastapi_example/tests/non_transactional/__init__.py) +The library also provides the ability to commit, rollback, and close at any +time, without waiting for the end of the request, without any problems. diff --git a/context_async_sqlalchemy/__init__.py b/context_async_sqlalchemy/__init__.py index 83b6532..e70442b 100644 --- a/context_async_sqlalchemy/__init__.py +++ b/context_async_sqlalchemy/__init__.py @@ -5,7 +5,6 @@ get_db_session_from_context, put_db_session_to_context, pop_db_session_from_context, - run_in_new_ctx, ) from .connect import DBConnect from .session import ( @@ -23,9 +22,15 @@ rollback_all_sessions, close_all_sessions, ) +from .run_in_new_context import run_in_new_ctx +from .starlette_utils import ( + add_starlette_http_db_session_middleware, + starlette_http_db_session_middleware, +) + from .fastapi_utils import ( - fastapi_db_session_middleware, - add_fastapi_db_session_middleware, + fastapi_http_db_session_middleware, + add_fastapi_http_db_session_middleware, ) __all__ = [ @@ -48,6 +53,8 @@ "commit_all_sessions", "rollback_all_sessions", "close_all_sessions", - "fastapi_db_session_middleware", - "add_fastapi_db_session_middleware", + "add_starlette_http_db_session_middleware", + "starlette_http_db_session_middleware", + "fastapi_http_db_session_middleware", + "add_fastapi_http_db_session_middleware", ] diff --git a/context_async_sqlalchemy/connect.py b/context_async_sqlalchemy/connect.py index 7a1bca5..f252b9d 100644 --- a/context_async_sqlalchemy/connect.py +++ b/context_async_sqlalchemy/connect.py @@ -66,10 +66,10 @@ async def change_host(self, host: str) -> None: async def create_session(self) -> AsyncSession: """Creates a new session""" - maker = await self.get_session_maker() + maker = await self.session_maker() return maker() - async def get_session_maker(self) -> async_sessionmaker[AsyncSession]: + async def session_maker(self) -> async_sessionmaker[AsyncSession]: """Gets the session maker""" if self._before_create_session_handler: await self._before_create_session_handler(self) diff --git a/context_async_sqlalchemy/context.py b/context_async_sqlalchemy/context.py index 4f23a57..3c96a58 100644 --- a/context_async_sqlalchemy/context.py +++ b/context_async_sqlalchemy/context.py @@ -1,16 +1,18 @@ -from contextvars import ContextVar, copy_context, Token -from typing import Any, Awaitable, Callable, Generator, TypeVar +from contextvars import ContextVar, Token +from typing import Any, Generator from sqlalchemy.ext.asyncio import AsyncSession from .connect import DBConnect -def init_db_session_ctx() -> Token[dict[str, AsyncSession] | None]: +def init_db_session_ctx( + force: bool = False, +) -> Token[dict[str, AsyncSession] | None]: """ Initiates a context for storing sessions """ - if is_context_initiated(): + if not force and is_context_initiated(): raise Exception("Context already initiated") return _init_db_session_ctx() @@ -73,30 +75,6 @@ def sessions_stream() -> Generator[AsyncSession, Any, None]: yield session -AsyncCallableResult = TypeVar("AsyncCallableResult") -AsyncCallable = Callable[..., Awaitable[AsyncCallableResult]] - - -async def run_in_new_ctx( - callable_func: AsyncCallable[AsyncCallableResult], - *args: Any, - **kwargs: Any, -) -> AsyncCallableResult: - """ - Runs a function in a new context with new sessions that have their - own connection. - The intended use is to run multiple database queries concurrently. - - example of use: - await asyncio.gather( - run_in_new_ctx(your_function_with_db_session, ...), - run_in_new_ctx(your_function_with_db_session, ...), - ) - """ - new_ctx = copy_context() - return await new_ctx.run(_new_ctx_wrapper, callable_func, *args, **kwargs) - - _db_session_ctx: ContextVar[dict[str, AsyncSession] | None] = ContextVar( "db_session_ctx", default=None ) @@ -112,15 +90,3 @@ def _get_initiated_context() -> dict[str, AsyncSession]: def _init_db_session_ctx() -> Token[dict[str, AsyncSession] | None]: session_ctx: dict[str, AsyncSession] | None = {} return _db_session_ctx.set(session_ctx) - - -async def _new_ctx_wrapper( - callable_func: AsyncCallable[AsyncCallableResult], - *args: Any, - **kwargs: Any, -) -> AsyncCallableResult: - token = _init_db_session_ctx() - try: - return await callable_func(*args, **kwargs) - finally: - await reset_db_session_ctx(token) diff --git a/context_async_sqlalchemy/fastapi_utils/__init__.py b/context_async_sqlalchemy/fastapi_utils/__init__.py index 81a60d0..4112aa5 100644 --- a/context_async_sqlalchemy/fastapi_utils/__init__.py +++ b/context_async_sqlalchemy/fastapi_utils/__init__.py @@ -1,9 +1,9 @@ from .middleware import ( - fastapi_db_session_middleware, - add_fastapi_db_session_middleware, + fastapi_http_db_session_middleware, + add_fastapi_http_db_session_middleware, ) __all__ = [ - "fastapi_db_session_middleware", - "add_fastapi_db_session_middleware", + "fastapi_http_db_session_middleware", + "add_fastapi_http_db_session_middleware", ] diff --git a/context_async_sqlalchemy/fastapi_utils/middleware.py b/context_async_sqlalchemy/fastapi_utils/middleware.py index 4a219ce..70b168d 100644 --- a/context_async_sqlalchemy/fastapi_utils/middleware.py +++ b/context_async_sqlalchemy/fastapi_utils/middleware.py @@ -1,27 +1,22 @@ -from fastapi import FastAPI, Request +from fastapi import FastAPI from starlette.middleware.base import ( # type: ignore[attr-defined] + Request, Response, RequestResponseEndpoint, - BaseHTTPMiddleware, ) from context_async_sqlalchemy import ( - init_db_session_ctx, - is_context_initiated, - reset_db_session_ctx, - auto_commit_by_status_code, - rollback_all_sessions, + add_starlette_http_db_session_middleware, + starlette_http_db_session_middleware, ) -def add_fastapi_db_session_middleware(app: FastAPI) -> None: +def add_fastapi_http_db_session_middleware(app: FastAPI) -> None: """Adds middleware to the application""" - app.add_middleware( - BaseHTTPMiddleware, dispatch=fastapi_db_session_middleware - ) + add_starlette_http_db_session_middleware(app) -async def fastapi_db_session_middleware( +async def fastapi_http_db_session_middleware( request: Request, call_next: RequestResponseEndpoint ) -> Response: """ @@ -33,22 +28,4 @@ async def fastapi_db_session_middleware( But you can commit or rollback manually in the handler. """ - # Tests have different session management rules - # so if the context variable is already set, we do nothing - if is_context_initiated(): - return await call_next(request) - - # We set the context here, meaning all child coroutines will receive the - # same context. And even if a child coroutine requests the - # session first, the dictionary itself is shared, and this coroutine will - # add the session to dictionary = shared context. - token = init_db_session_ctx() - try: - response = await call_next(request) - await auto_commit_by_status_code(response.status_code) - return response - except Exception: - await rollback_all_sessions() - raise - finally: - await reset_db_session_ctx(token) + return await starlette_http_db_session_middleware(request, call_next) diff --git a/context_async_sqlalchemy/run_in_new_context.py b/context_async_sqlalchemy/run_in_new_context.py new file mode 100644 index 0000000..ff4fdbc --- /dev/null +++ b/context_async_sqlalchemy/run_in_new_context.py @@ -0,0 +1,52 @@ +from contextvars import copy_context +from typing import Any, Awaitable, Callable, TypeVar + +from .context import init_db_session_ctx, reset_db_session_ctx +from .auto_commit import commit_all_sessions, rollback_all_sessions + + +AsyncCallableResult = TypeVar("AsyncCallableResult") +AsyncCallable = Callable[..., Awaitable[AsyncCallableResult]] + + +async def run_in_new_ctx( + callable_func: AsyncCallable[AsyncCallableResult], + *args: Any, + **kwargs: Any, +) -> AsyncCallableResult: + """ + Runs a function in a new context with new sessions that have their + own connection. + + It will commit the transaction automatically if callable_func does not + raise exceptions. Otherwise, the transaction will be rolled back. + + The intended use is to run multiple database queries concurrently. + + example of use: + await asyncio.gather( + run_in_new_ctx( + your_function_with_db_session, some_arg, some_kwarg=123, + ), + run_in_new_ctx(your_function_with_db_session, ...), + ) + """ + new_ctx = copy_context() + return await new_ctx.run(_new_ctx_wrapper, callable_func, *args, **kwargs) + + +async def _new_ctx_wrapper( + callable_func: AsyncCallable[AsyncCallableResult], + *args: Any, + **kwargs: Any, +) -> AsyncCallableResult: + token = init_db_session_ctx(force=True) + try: + result = await callable_func(*args, **kwargs) + await commit_all_sessions() + return result + except Exception: + await rollback_all_sessions() + raise + finally: + await reset_db_session_ctx(token) diff --git a/context_async_sqlalchemy/session.py b/context_async_sqlalchemy/session.py index 741da31..e639b0c 100644 --- a/context_async_sqlalchemy/session.py +++ b/context_async_sqlalchemy/session.py @@ -99,7 +99,7 @@ async def new_non_ctx_session( async with new_non_ctx_session(connect) as session: await session.execute(...) """ - session_maker = await connect.get_session_maker() + session_maker = await connect.session_maker() async with session_maker() as session: yield session diff --git a/context_async_sqlalchemy/starlette_utils/__init__.py b/context_async_sqlalchemy/starlette_utils/__init__.py new file mode 100644 index 0000000..f2198c0 --- /dev/null +++ b/context_async_sqlalchemy/starlette_utils/__init__.py @@ -0,0 +1,9 @@ +from .http_middleware import ( + add_starlette_http_db_session_middleware, + starlette_http_db_session_middleware, +) + +__all__ = [ + "add_starlette_http_db_session_middleware", + "starlette_http_db_session_middleware", +] diff --git a/context_async_sqlalchemy/starlette_utils/http_middleware.py b/context_async_sqlalchemy/starlette_utils/http_middleware.py new file mode 100644 index 0000000..95099b3 --- /dev/null +++ b/context_async_sqlalchemy/starlette_utils/http_middleware.py @@ -0,0 +1,58 @@ +from starlette.applications import Starlette +from starlette.middleware.base import ( # type: ignore[attr-defined] + Request, + Response, + RequestResponseEndpoint, + BaseHTTPMiddleware, +) + +from context_async_sqlalchemy import ( + init_db_session_ctx, + is_context_initiated, + reset_db_session_ctx, + auto_commit_by_status_code, + rollback_all_sessions, +) + + +def add_starlette_http_db_session_middleware(app: Starlette) -> None: + """Adds middleware to the application""" + app.add_middleware( + BaseHTTPMiddleware, dispatch=starlette_http_db_session_middleware + ) + + +async def starlette_http_db_session_middleware( + request: Request, call_next: RequestResponseEndpoint +) -> Response: + """ + Database session lifecycle management. + The session itself is created on demand in db_session(). + + Transaction auto-commit is implemented if there is no exception and + the response status is < 400. Otherwise, a rollback is performed. + + But you can commit or rollback manually in the handler. + """ + # Tests have different session management rules + # so if the context variable is already set, we do nothing + if is_context_initiated(): + return await call_next(request) + + # We set the context here, meaning all child coroutines will receive the + # same context. And even if a child coroutine requests the + # session first, the container itself is shared, and this coroutine will + # add the session to container = shared context. + token = init_db_session_ctx() + try: + response = await call_next(request) + # using the status code, we decide to commit or rollback all sessions + await auto_commit_by_status_code(response.status_code) + return response + except Exception: + # If an exception occurs, we roll all sessions back + await rollback_all_sessions() + raise + finally: + # Close all sessions and clear the context + await reset_db_session_ctx(token) diff --git a/context_async_sqlalchemy/test_utils.py b/context_async_sqlalchemy/test_utils.py index fa0234b..137f499 100644 --- a/context_async_sqlalchemy/test_utils.py +++ b/context_async_sqlalchemy/test_utils.py @@ -18,7 +18,7 @@ async def rollback_session( connection: DBConnect, ) -> AsyncGenerator[AsyncSession]: """A session that always rolls back""" - session_maker = await connection.get_session_maker() + session_maker = await connection.session_maker() async with session_maker() as session: try: yield session @@ -55,7 +55,7 @@ async def put_savepoint_session_in_ctx( It is also important to use this function inside set_test_context. """ - session_maker = await connection.get_session_maker() + session_maker = await connection.session_maker() async with session_maker( # Bind to the same connection bind=await session.connection(), diff --git a/docs/404.html b/docs/404.html new file mode 100644 index 0000000..25405ed --- /dev/null +++ b/docs/404.html @@ -0,0 +1,125 @@ + + + + + + + + context-async-sqlalchemy + + + + + + + + + + + +
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Using flexbox, we + * achieve it in such a way that it will look like the following: + * + * [No repo_name] + * Next >> // On the first page + * << Previous Next >> // On all subsequent pages + * + * [With repo_name] + * Next >> // On the first page + * << Previous Next >> // On all subsequent pages + * + * https://github.com/mkdocs/mkdocs/issues/2012 + */ +.rst-versions .rst-current-version { + padding: 0 12px; + display: flex; + font-size: initial; + justify-content: space-between; + align-items: center; + line-height: 40px; +} + +/* + * Please note that this amendment also involves removing certain inline-styles + * from the file ./mkdocs/themes/readthedocs/versions.html. + * + * https://github.com/mkdocs/mkdocs/issues/2012 + */ +.rst-current-version span { + flex: 1; + text-align: center; +} diff --git a/docs/getting_started/index.html b/docs/getting_started/index.html new file mode 100644 index 0000000..1cbf0f8 --- /dev/null +++ b/docs/getting_started/index.html @@ -0,0 +1,269 @@ + + + + + + + + Getting started - context-async-sqlalchemy + + + + + + + + + + + + + +
+ + +
+ +
+
+ +
+
+
+
+ +

from starlette.applications import Starlette

+

Getting started

+

Configure the connection to the database

+

for example for PostgreSQL database.py:

+
from sqlalchemy.ext.asyncio import (
+    async_sessionmaker,
+    AsyncEngine,
+    AsyncSession,
+    create_async_engine,
+)
+
+from context_async_sqlalchemy import DBConnect
+
+
+def create_engine(host: str) -> AsyncEngine:
+    """
+    database connection parameters.
+    """
+
+    # In production code, you will probably take these parameters from env
+    pg_user = "krylosov-aa"
+    pg_password = ""
+    pg_port = 6432
+    pg_db = "test"
+    return create_async_engine(
+        f"postgresql+asyncpg://"
+        f"{pg_user}:{pg_password}"
+        f"@{host}:{pg_port}"
+        f"/{pg_db}",
+        future=True,
+        pool_pre_ping=True,
+    )
+
+
+def create_session_maker(
+    engine: AsyncEngine,
+) -> async_sessionmaker[AsyncSession]:
+    """session parameters"""
+    return async_sessionmaker(
+        engine, class_=AsyncSession, expire_on_commit=False
+    )
+
+
+connection = DBConnect(
+    host="127.0.0.1",
+    engine_creator=create_engine,
+    session_maker_creator=create_session_maker,
+)
+
+

Manage Database connection lifecycle

+

Close the resources at the end of your application's life

+

Example for FastAPI:

+
from contextlib import asynccontextmanager
+from typing import Any, AsyncGenerator
+from fastapi import FastAPI
+
+from database import connection
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]:
+    """Database connection lifecycle management"""
+    yield
+    await connection.close()  # Close the engine if it was open
+
+

Setup middleware

+

Middleware takes on the most important and complex work of managing context and sessions.

+

You can use ready-made middlewares:

+

FastAPI

+
from context_async_sqlalchemy.fastapi_utils import (
+    add_fastapi_http_db_session_middleware,
+)
+
+app = FastAPI(...)
+add_fastapi_http_db_session_middleware(app)
+
+

Starlette

+
from context_async_sqlalchemy.starlette_utils import (
+    add_starlette_http_db_session_middleware,
+)
+
+app = Starlette(...)
+add_starlette_http_db_session_middleware(app)
+
+

Write own

+

If there is no ready-made solution for you, don't worry! You can see +how it works and write your own.

+

Use it

+
from context_async_sqlalchemy import db_session
+from sqlalchemy import insert
+
+from database import connection  # your configured connection to the database
+from models import ExampleTable  # just some model for example
+
+async def some_func() -> None:
+    # Created a session (no connection to the database yet)
+    session = await db_session(connection)
+
+    stmt = insert(ExampleTable).values(text="example_with_db_session")
+
+    # On the first request, a connection and transaction were opened
+    await session.execute(stmt)
+
+    # If you call db_session again, it will return the same session
+    # even in child coroutines.
+    session = await db_session(connection)
+
+    # The second request will use the same connection and the same transaction
+    await session.execute(stmt)
+
+    # The commit and closing of the session will occur automatically
+
+

Examples

+

The repository includes an example integration with FastAPI, +which describes numerous workflows. +FastAPI example

+

It also includes two types of test setups you can use in your projects.

+

All library tests are in the examples, as we want to test not in the abstract +but in the context of a real asynchronous web application.

+

FastAPI tests example

+ +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + « Previous + + + Next » + + +
+ + + + + + + + + diff --git a/docs/how_middleware_works/index.html b/docs/how_middleware_works/index.html new file mode 100644 index 0000000..4b95e0c --- /dev/null +++ b/docs/how_middleware_works/index.html @@ -0,0 +1,192 @@ + + + + + + + + How middleware works - context-async-sqlalchemy + + + + + + + + + + + + + +
+ + +
+ +
+
+ +
+
+
+
+ +

How middleware works

+

The biggest part of the work and magic happens in middleware. +The library strives to provide ready-made solutions so that you don't have to +worry. But they are not always there. +Therefore, we will tell you how starlette middleware works, +using the example of which you can write your own.

+
from starlette.middleware.base import (  # type: ignore[attr-defined]
+    Request,
+    Response,
+    RequestResponseEndpoint,
+    BaseHTTPMiddleware,
+)
+
+from context_async_sqlalchemy import (
+    init_db_session_ctx,
+    is_context_initiated,
+    reset_db_session_ctx,
+    auto_commit_by_status_code,
+    rollback_all_sessions,
+)
+
+async def starlette_http_db_session_middleware(
+    request: Request, call_next: RequestResponseEndpoint
+) -> Response:
+    """
+    Database session lifecycle management.
+    The session itself is created on demand in db_session().
+
+    Transaction auto-commit is implemented if there is no exception and
+        the response status is < 400. Otherwise, a rollback is performed.
+
+    But you can commit or rollback manually in the handler.
+    """
+    # Tests have different session management rules
+    # so if the context variable is already set, we do nothing
+    if is_context_initiated():
+        return await call_next(request)
+
+    # We set the context here, meaning all child coroutines will receive the
+    # same context. And even if a child coroutine requests the
+    # session first, the container itself is shared, and this coroutine will
+    # add the session to container = shared context.
+    token = init_db_session_ctx()
+    try:
+        response = await call_next(request)
+        # using the status code, we decide to commit or rollback all sessions
+        await auto_commit_by_status_code(response.status_code)
+        return response
+    except Exception:
+        # If an exception occurs, we roll all sessions back
+        await rollback_all_sessions()
+        raise
+    finally:
+        # Close all sessions and clear the context
+        await reset_db_session_ctx(token)
+
+ +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + « Previous + + + +
+ + + + + + + + + diff --git a/docs/img/basic_schema.png b/docs/img/basic_schema.png new file mode 100644 index 0000000..fe043fa Binary files /dev/null and b/docs/img/basic_schema.png differ diff --git a/docs/img/favicon.ico b/docs/img/favicon.ico new file mode 100644 index 0000000..e85006a Binary files /dev/null and b/docs/img/favicon.ico differ diff --git a/docs/index.html b/docs/index.html new file mode 100644 index 0000000..961072a --- /dev/null +++ b/docs/index.html @@ -0,0 +1,206 @@ + + + + + + + + context-async-sqlalchemy + + + + + + + + + + + + + +
+ + +
+ +
+
+ +
+
+
+
+ +

context-async-sqlalchemy

+

PyPI

+

SOURCE CODE

+

Provides a super convenient way to work with sqlalchemy in asynchronous +applications. It takes care of the issues of managing the lifecycle of engine, +session, and transactions without being a wrapper.

+

The main task is to get quick and easy access to the session and not worry +about when to open and when to close it.

+

The key features are:

+
    +
  • Super easy to use
  • +
  • Automatically manages the lifecycle of engine, session, and transaction +(autocommit/autorollback)
  • +
  • It doesn't interfere with manually opening and closing sessions and +transactions when needed.
  • +
  • Does not depend on the web framework
  • +
  • It is not a wrapper over sqlalchemy
  • +
  • It is convenient to test
  • +
  • Host switching in runtime
  • +
  • It can manage multiple databases and multiple sessions to a single database
  • +
  • Provides tools for concurrent sql queries
  • +
+

What does usage look like?

+
from context_async_sqlalchemy import db_session
+from sqlalchemy import insert
+
+from database import connection  # your configured connection to the database
+from models import ExampleTable  # just some model for example
+
+async def some_func() -> None:
+    # Created a session (no connection to the database yet)
+    session = await db_session(connection)
+
+    stmt = insert(ExampleTable).values(text="example_with_db_session")
+
+    # On the first request, a connection and transaction were opened
+    await session.execute(stmt)
+
+    # If you call db_session again, it will return the same session
+    # even in child coroutines.
+    session = await db_session(connection)
+
+    # The second request will use the same connection and the same transaction
+    await session.execute(stmt)
+
+    # The commit and closing of the session will occur automatically
+
+

How it works

+

Here is a very simplified diagram of how everything works:

+

basic schema.png

+
    +
  1. Before executing your code, the middleware will prepare a container in +which the sessions required by your code will be stored. +The container is saved in contextvars
  2. +
  3. Your code accesses the library to create new sessions and retrieve +existing ones
  4. +
  5. After your code, middleware will automatically commit or roll back open +transactions. Closes open sessions and clears the context.
  6. +
+

The library also provides the ability to commit, rollback, and close at any +time, without waiting for the end of the request, without any problems.

+ +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + + Next » + + +
+ + + + + + + + + + + diff --git a/docs/js/html5shiv.min.js b/docs/js/html5shiv.min.js new file mode 100644 index 0000000..1a01c94 --- /dev/null +++ b/docs/js/html5shiv.min.js @@ -0,0 +1,4 @@ +/** +* @preserve HTML5 Shiv 3.7.3 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed +*/ +!function(a,b){function c(a,b){var c=a.createElement("p"),d=a.getElementsByTagName("head")[0]||a.documentElement;return c.innerHTML="x",d.insertBefore(c.lastChild,d.firstChild)}function d(){var a=t.elements;return"string"==typeof a?a.split(" "):a}function e(a,b){var c=t.elements;"string"!=typeof c&&(c=c.join(" ")),"string"!=typeof a&&(a=a.join(" ")),t.elements=c+" "+a,j(b)}function f(a){var b=s[a[q]];return b||(b={},r++,a[q]=r,s[r]=b),b}function g(a,c,d){if(c||(c=b),l)return c.createElement(a);d||(d=f(c));var e;return e=d.cache[a]?d.cache[a].cloneNode():p.test(a)?(d.cache[a]=d.createElem(a)).cloneNode():d.createElem(a),!e.canHaveChildren||o.test(a)||e.tagUrn?e:d.frag.appendChild(e)}function 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+ + +
+ +
+
+
    +
  • + +
  • + Edit on GitHub +
  • +
+
+
+
+
+ +

Master/Replica or several databases at the same time

+

This is why db_session and other functions accept DBConnect as input. +This way, you can work with multiple hosts simultaneously, for example, +with the master and the replica.

+

DBConnect also accepts factories instead of ready-made objects, so that you +can easily change the host at the right time.

+

For example, libpq can detect the master and replica to create an engine. +However, it only does this once during creation. before_create_session_handler +helps change the host in the runtime if the master or replica changes. +You need a third-party functionality that helps determine the master or +replica. +I hope I can give you a ready solution soon too.

+

The engine will not be created immediately when DBConnect is initialized. +This will only happen on the first request. The library is lazy in many places.

+
from context_async_sqlalchemy import DBConnect
+
+from master_replica_helper import get_master, get_replica
+
+
+async def renew_master_connect(connect: DBConnect) -> None:
+    """Updates the host if the master has changed"""
+    master_host = await get_master()
+    if master_host != connect.host:
+        await connect.change_host(master_host)
+
+
+master = DBConnect(
+    ...,
+    before_create_session_handler=renew_master_connect,
+)
+
+
+async def renew_replica_connect(connect: DBConnect) -> None:
+    """Updates the host if the replica has changed"""
+    replica_host = await get_replica()
+    if replica_host != connect.host:
+        await connect.change_host(replica_host)
+
+
+replica = DBConnect(
+    ...,
+    before_create_session_handler=renew_replica_connect,
+)
+
+ +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + « Previous + + + Next » + + +
+ + + + + + + + + diff --git a/docs/search.html b/docs/search.html new file mode 100644 index 0000000..66b67bf --- /dev/null +++ b/docs/search.html @@ -0,0 +1,132 @@ + + + + + + + + context-async-sqlalchemy + + + + + + + + + + + +
+ + +
+ +
+
+
    +
  • +
  • +
  • +
+
+
+
+
+ + +

Search Results

+ + + +
+ Searching... +
+ + +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + + +
+ + + + + + + + + diff --git a/docs/search/lunr.js b/docs/search/lunr.js new file mode 100644 index 0000000..aca0a16 --- /dev/null +++ b/docs/search/lunr.js @@ -0,0 +1,3475 @@ +/** + * lunr - http://lunrjs.com - A bit like Solr, but much smaller and not as bright - 2.3.9 + * Copyright (C) 2020 Oliver Nightingale + * @license MIT + */ + +;(function(){ + +/** + * A convenience function for configuring and constructing + * a new lunr Index. + * + * A lunr.Builder instance is created and the pipeline setup + * with a trimmer, stop word filter and stemmer. + * + * This builder object is yielded to the configuration function + * that is passed as a parameter, allowing the list of fields + * and other builder parameters to be customised. + * + * All documents _must_ be added within the passed config function. + * + * @example + * var idx = lunr(function () { + * this.field('title') + * this.field('body') + * this.ref('id') + * + * documents.forEach(function (doc) { + * this.add(doc) + * }, this) + * }) + * + * @see {@link lunr.Builder} + * @see {@link lunr.Pipeline} + * @see {@link lunr.trimmer} + * @see {@link lunr.stopWordFilter} + * @see {@link lunr.stemmer} + * @namespace {function} lunr + */ +var lunr = function (config) { + var builder = new lunr.Builder + + builder.pipeline.add( + lunr.trimmer, + lunr.stopWordFilter, + lunr.stemmer + ) + + builder.searchPipeline.add( + lunr.stemmer + ) + + config.call(builder, builder) + return builder.build() +} + +lunr.version = "2.3.9" +/*! + * lunr.utils + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * A namespace containing utils for the rest of the lunr library + * @namespace lunr.utils + */ +lunr.utils = {} + +/** + * Print a warning message to the console. + * + * @param {String} message The message to be printed. + * @memberOf lunr.utils + * @function + */ +lunr.utils.warn = (function (global) { + /* eslint-disable no-console */ + return function (message) { + if (global.console && console.warn) { + console.warn(message) + } + } + /* eslint-enable no-console */ +})(this) + +/** + * Convert an object to a string. + * + * In the case of `null` and `undefined` the function returns + * the empty string, in all other cases the result of calling + * `toString` on the passed object is returned. + * + * @param {Any} obj The object to convert to a string. + * @return {String} string representation of the passed object. + * @memberOf lunr.utils + */ +lunr.utils.asString = function (obj) { + if (obj === void 0 || obj === null) { + return "" + } else { + return obj.toString() + } +} + +/** + * Clones an object. + * + * Will create a copy of an existing object such that any mutations + * on the copy cannot affect the original. + * + * Only shallow objects are supported, passing a nested object to this + * function will cause a TypeError. + * + * Objects with primitives, and arrays of primitives are supported. + * + * @param {Object} obj The object to clone. + * @return {Object} a clone of the passed object. + * @throws {TypeError} when a nested object is passed. + * @memberOf Utils + */ +lunr.utils.clone = function (obj) { + if (obj === null || obj === undefined) { + return obj + } + + var clone = Object.create(null), + keys = Object.keys(obj) + + for (var i = 0; i < keys.length; i++) { + var key = keys[i], + val = obj[key] + + if (Array.isArray(val)) { + clone[key] = val.slice() + continue + } + + if (typeof val === 'string' || + typeof val === 'number' || + typeof val === 'boolean') { + clone[key] = val + continue + } + + throw new TypeError("clone is not deep and does not support nested objects") + } + + return clone +} +lunr.FieldRef = function (docRef, fieldName, stringValue) { + this.docRef = docRef + this.fieldName = fieldName + this._stringValue = stringValue +} + +lunr.FieldRef.joiner = "/" + +lunr.FieldRef.fromString = function (s) { + var n = s.indexOf(lunr.FieldRef.joiner) + + if (n === -1) { + throw "malformed field ref string" + } + + var fieldRef = s.slice(0, n), + docRef = s.slice(n + 1) + + return new lunr.FieldRef (docRef, fieldRef, s) +} + +lunr.FieldRef.prototype.toString = function () { + if (this._stringValue == undefined) { + this._stringValue = this.fieldName + lunr.FieldRef.joiner + this.docRef + } + + return this._stringValue +} +/*! + * lunr.Set + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * A lunr set. + * + * @constructor + */ +lunr.Set = function (elements) { + this.elements = Object.create(null) + + if (elements) { + this.length = elements.length + + for (var i = 0; i < this.length; i++) { + this.elements[elements[i]] = true + } + } else { + this.length = 0 + } +} + +/** + * A complete set that contains all elements. + * + * @static + * @readonly + * @type {lunr.Set} + */ +lunr.Set.complete = { + intersect: function (other) { + return other + }, + + union: function () { + return this + }, + + contains: function () { + return true + } +} + +/** + * An empty set that contains no elements. + * + * @static + * @readonly + * @type {lunr.Set} + */ +lunr.Set.empty = { + intersect: function () { + return this + }, + + union: function (other) { + return other + }, + + contains: function () { + return false + } +} + +/** + * Returns true if this set contains the specified object. + * + * @param {object} object - Object whose presence in this set is to be tested. + * @returns {boolean} - True if this set contains the specified object. + */ +lunr.Set.prototype.contains = function (object) { + return !!this.elements[object] +} + +/** + * Returns a new set containing only the elements that are present in both + * this set and the specified set. + * + * @param {lunr.Set} other - set to intersect with this set. + * @returns {lunr.Set} a new set that is the intersection of this and the specified set. + */ + +lunr.Set.prototype.intersect = function (other) { + var a, b, elements, intersection = [] + + if (other === lunr.Set.complete) { + return this + } + + if (other === lunr.Set.empty) { + return other + } + + if (this.length < other.length) { + a = this + b = other + } else { + a = other + b = this + } + + elements = Object.keys(a.elements) + + for (var i = 0; i < elements.length; i++) { + var element = elements[i] + if (element in b.elements) { + intersection.push(element) + } + } + + return new lunr.Set (intersection) +} + +/** + * Returns a new set combining the elements of this and the specified set. + * + * @param {lunr.Set} other - set to union with this set. + * @return {lunr.Set} a new set that is the union of this and the specified set. + */ + +lunr.Set.prototype.union = function (other) { + if (other === lunr.Set.complete) { + return lunr.Set.complete + } + + if (other === lunr.Set.empty) { + return this + } + + return new lunr.Set(Object.keys(this.elements).concat(Object.keys(other.elements))) +} +/** + * A function to calculate the inverse document frequency for + * a posting. This is shared between the builder and the index + * + * @private + * @param {object} posting - The posting for a given term + * @param {number} documentCount - The total number of documents. + */ +lunr.idf = function (posting, documentCount) { + var documentsWithTerm = 0 + + for (var fieldName in posting) { + if (fieldName == '_index') continue // Ignore the term index, its not a field + documentsWithTerm += Object.keys(posting[fieldName]).length + } + + var x = (documentCount - documentsWithTerm + 0.5) / (documentsWithTerm + 0.5) + + return Math.log(1 + Math.abs(x)) +} + +/** + * A token wraps a string representation of a token + * as it is passed through the text processing pipeline. + * + * @constructor + * @param {string} [str=''] - The string token being wrapped. + * @param {object} [metadata={}] - Metadata associated with this token. + */ +lunr.Token = function (str, metadata) { + this.str = str || "" + this.metadata = metadata || {} +} + +/** + * Returns the token string that is being wrapped by this object. + * + * @returns {string} + */ +lunr.Token.prototype.toString = function () { + return this.str +} + +/** + * A token update function is used when updating or optionally + * when cloning a token. + * + * @callback lunr.Token~updateFunction + * @param {string} str - The string representation of the token. + * @param {Object} metadata - All metadata associated with this token. + */ + +/** + * Applies the given function to the wrapped string token. + * + * @example + * token.update(function (str, metadata) { + * return str.toUpperCase() + * }) + * + * @param {lunr.Token~updateFunction} fn - A function to apply to the token string. + * @returns {lunr.Token} + */ +lunr.Token.prototype.update = function (fn) { + this.str = fn(this.str, this.metadata) + return this +} + +/** + * Creates a clone of this token. Optionally a function can be + * applied to the cloned token. + * + * @param {lunr.Token~updateFunction} [fn] - An optional function to apply to the cloned token. + * @returns {lunr.Token} + */ +lunr.Token.prototype.clone = function (fn) { + fn = fn || function (s) { return s } + return new lunr.Token (fn(this.str, this.metadata), this.metadata) +} +/*! + * lunr.tokenizer + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * A function for splitting a string into tokens ready to be inserted into + * the search index. Uses `lunr.tokenizer.separator` to split strings, change + * the value of this property to change how strings are split into tokens. + * + * This tokenizer will convert its parameter to a string by calling `toString` and + * then will split this string on the character in `lunr.tokenizer.separator`. + * Arrays will have their elements converted to strings and wrapped in a lunr.Token. + * + * Optional metadata can be passed to the tokenizer, this metadata will be cloned and + * added as metadata to every token that is created from the object to be tokenized. + * + * @static + * @param {?(string|object|object[])} obj - The object to convert into tokens + * @param {?object} metadata - Optional metadata to associate with every token + * @returns {lunr.Token[]} + * @see {@link lunr.Pipeline} + */ +lunr.tokenizer = function (obj, metadata) { + if (obj == null || obj == undefined) { + return [] + } + + if (Array.isArray(obj)) { + return obj.map(function (t) { + return new lunr.Token( + lunr.utils.asString(t).toLowerCase(), + lunr.utils.clone(metadata) + ) + }) + } + + var str = obj.toString().toLowerCase(), + len = str.length, + tokens = [] + + for (var sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd++) { + var char = str.charAt(sliceEnd), + sliceLength = sliceEnd - sliceStart + + if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) { + + if (sliceLength > 0) { + var tokenMetadata = lunr.utils.clone(metadata) || {} + tokenMetadata["position"] = [sliceStart, sliceLength] + tokenMetadata["index"] = tokens.length + + tokens.push( + new lunr.Token ( + str.slice(sliceStart, sliceEnd), + tokenMetadata + ) + ) + } + + sliceStart = sliceEnd + 1 + } + + } + + return tokens +} + +/** + * The separator used to split a string into tokens. Override this property to change the behaviour of + * `lunr.tokenizer` behaviour when tokenizing strings. By default this splits on whitespace and hyphens. + * + * @static + * @see lunr.tokenizer + */ +lunr.tokenizer.separator = /[\s\-]+/ +/*! + * lunr.Pipeline + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * lunr.Pipelines maintain an ordered list of functions to be applied to all + * tokens in documents entering the search index and queries being ran against + * the index. + * + * An instance of lunr.Index created with the lunr shortcut will contain a + * pipeline with a stop word filter and an English language stemmer. Extra + * functions can be added before or after either of these functions or these + * default functions can be removed. + * + * When run the pipeline will call each function in turn, passing a token, the + * index of that token in the original list of all tokens and finally a list of + * all the original tokens. + * + * The output of functions in the pipeline will be passed to the next function + * in the pipeline. To exclude a token from entering the index the function + * should return undefined, the rest of the pipeline will not be called with + * this token. + * + * For serialisation of pipelines to work, all functions used in an instance of + * a pipeline should be registered with lunr.Pipeline. Registered functions can + * then be loaded. If trying to load a serialised pipeline that uses functions + * that are not registered an error will be thrown. + * + * If not planning on serialising the pipeline then registering pipeline functions + * is not necessary. + * + * @constructor + */ +lunr.Pipeline = function () { + this._stack = [] +} + +lunr.Pipeline.registeredFunctions = Object.create(null) + +/** + * A pipeline function maps lunr.Token to lunr.Token. A lunr.Token contains the token + * string as well as all known metadata. A pipeline function can mutate the token string + * or mutate (or add) metadata for a given token. + * + * A pipeline function can indicate that the passed token should be discarded by returning + * null, undefined or an empty string. This token will not be passed to any downstream pipeline + * functions and will not be added to the index. + * + * Multiple tokens can be returned by returning an array of tokens. Each token will be passed + * to any downstream pipeline functions and all will returned tokens will be added to the index. + * + * Any number of pipeline functions may be chained together using a lunr.Pipeline. + * + * @interface lunr.PipelineFunction + * @param {lunr.Token} token - A token from the document being processed. + * @param {number} i - The index of this token in the complete list of tokens for this document/field. + * @param {lunr.Token[]} tokens - All tokens for this document/field. + * @returns {(?lunr.Token|lunr.Token[])} + */ + +/** + * Register a function with the pipeline. + * + * Functions that are used in the pipeline should be registered if the pipeline + * needs to be serialised, or a serialised pipeline needs to be loaded. + * + * Registering a function does not add it to a pipeline, functions must still be + * added to instances of the pipeline for them to be used when running a pipeline. + * + * @param {lunr.PipelineFunction} fn - The function to check for. + * @param {String} label - The label to register this function with + */ +lunr.Pipeline.registerFunction = function (fn, label) { + if (label in this.registeredFunctions) { + lunr.utils.warn('Overwriting existing registered function: ' + label) + } + + fn.label = label + lunr.Pipeline.registeredFunctions[fn.label] = fn +} + +/** + * Warns if the function is not registered as a Pipeline function. + * + * @param {lunr.PipelineFunction} fn - The function to check for. + * @private + */ +lunr.Pipeline.warnIfFunctionNotRegistered = function (fn) { + var isRegistered = fn.label && (fn.label in this.registeredFunctions) + + if (!isRegistered) { + lunr.utils.warn('Function is not registered with pipeline. This may cause problems when serialising the index.\n', fn) + } +} + +/** + * Loads a previously serialised pipeline. + * + * All functions to be loaded must already be registered with lunr.Pipeline. + * If any function from the serialised data has not been registered then an + * error will be thrown. + * + * @param {Object} serialised - The serialised pipeline to load. + * @returns {lunr.Pipeline} + */ +lunr.Pipeline.load = function (serialised) { + var pipeline = new lunr.Pipeline + + serialised.forEach(function (fnName) { + var fn = lunr.Pipeline.registeredFunctions[fnName] + + if (fn) { + pipeline.add(fn) + } else { + throw new Error('Cannot load unregistered function: ' + fnName) + } + }) + + return pipeline +} + +/** + * Adds new functions to the end of the pipeline. + * + * Logs a warning if the function has not been registered. + * + * @param {lunr.PipelineFunction[]} functions - Any number of functions to add to the pipeline. + */ +lunr.Pipeline.prototype.add = function () { + var fns = Array.prototype.slice.call(arguments) + + fns.forEach(function (fn) { + lunr.Pipeline.warnIfFunctionNotRegistered(fn) + this._stack.push(fn) + }, this) +} + +/** + * Adds a single function after a function that already exists in the + * pipeline. + * + * Logs a warning if the function has not been registered. + * + * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline. + * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline. + */ +lunr.Pipeline.prototype.after = function (existingFn, newFn) { + lunr.Pipeline.warnIfFunctionNotRegistered(newFn) + + var pos = this._stack.indexOf(existingFn) + if (pos == -1) { + throw new Error('Cannot find existingFn') + } + + pos = pos + 1 + this._stack.splice(pos, 0, newFn) +} + +/** + * Adds a single function before a function that already exists in the + * pipeline. + * + * Logs a warning if the function has not been registered. + * + * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline. + * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline. + */ +lunr.Pipeline.prototype.before = function (existingFn, newFn) { + lunr.Pipeline.warnIfFunctionNotRegistered(newFn) + + var pos = this._stack.indexOf(existingFn) + if (pos == -1) { + throw new Error('Cannot find existingFn') + } + + this._stack.splice(pos, 0, newFn) +} + +/** + * Removes a function from the pipeline. + * + * @param {lunr.PipelineFunction} fn The function to remove from the pipeline. + */ +lunr.Pipeline.prototype.remove = function (fn) { + var pos = this._stack.indexOf(fn) + if (pos == -1) { + return + } + + this._stack.splice(pos, 1) +} + +/** + * Runs the current list of functions that make up the pipeline against the + * passed tokens. + * + * @param {Array} tokens The tokens to run through the pipeline. + * @returns {Array} + */ +lunr.Pipeline.prototype.run = function (tokens) { + var stackLength = this._stack.length + + for (var i = 0; i < stackLength; i++) { + var fn = this._stack[i] + var memo = [] + + for (var j = 0; j < tokens.length; j++) { + var result = fn(tokens[j], j, tokens) + + if (result === null || result === void 0 || result === '') continue + + if (Array.isArray(result)) { + for (var k = 0; k < result.length; k++) { + memo.push(result[k]) + } + } else { + memo.push(result) + } + } + + tokens = memo + } + + return tokens +} + +/** + * Convenience method for passing a string through a pipeline and getting + * strings out. This method takes care of wrapping the passed string in a + * token and mapping the resulting tokens back to strings. + * + * @param {string} str - The string to pass through the pipeline. + * @param {?object} metadata - Optional metadata to associate with the token + * passed to the pipeline. + * @returns {string[]} + */ +lunr.Pipeline.prototype.runString = function (str, metadata) { + var token = new lunr.Token (str, metadata) + + return this.run([token]).map(function (t) { + return t.toString() + }) +} + +/** + * Resets the pipeline by removing any existing processors. + * + */ +lunr.Pipeline.prototype.reset = function () { + this._stack = [] +} + +/** + * Returns a representation of the pipeline ready for serialisation. + * + * Logs a warning if the function has not been registered. + * + * @returns {Array} + */ +lunr.Pipeline.prototype.toJSON = function () { + return this._stack.map(function (fn) { + lunr.Pipeline.warnIfFunctionNotRegistered(fn) + + return fn.label + }) +} +/*! + * lunr.Vector + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * A vector is used to construct the vector space of documents and queries. These + * vectors support operations to determine the similarity between two documents or + * a document and a query. + * + * Normally no parameters are required for initializing a vector, but in the case of + * loading a previously dumped vector the raw elements can be provided to the constructor. + * + * For performance reasons vectors are implemented with a flat array, where an elements + * index is immediately followed by its value. E.g. [index, value, index, value]. This + * allows the underlying array to be as sparse as possible and still offer decent + * performance when being used for vector calculations. + * + * @constructor + * @param {Number[]} [elements] - The flat list of element index and element value pairs. + */ +lunr.Vector = function (elements) { + this._magnitude = 0 + this.elements = elements || [] +} + + +/** + * Calculates the position within the vector to insert a given index. + * + * This is used internally by insert and upsert. If there are duplicate indexes then + * the position is returned as if the value for that index were to be updated, but it + * is the callers responsibility to check whether there is a duplicate at that index + * + * @param {Number} insertIdx - The index at which the element should be inserted. + * @returns {Number} + */ +lunr.Vector.prototype.positionForIndex = function (index) { + // For an empty vector the tuple can be inserted at the beginning + if (this.elements.length == 0) { + return 0 + } + + var start = 0, + end = this.elements.length / 2, + sliceLength = end - start, + pivotPoint = Math.floor(sliceLength / 2), + pivotIndex = this.elements[pivotPoint * 2] + + while (sliceLength > 1) { + if (pivotIndex < index) { + start = pivotPoint + } + + if (pivotIndex > index) { + end = pivotPoint + } + + if (pivotIndex == index) { + break + } + + sliceLength = end - start + pivotPoint = start + Math.floor(sliceLength / 2) + pivotIndex = this.elements[pivotPoint * 2] + } + + if (pivotIndex == index) { + return pivotPoint * 2 + } + + if (pivotIndex > index) { + return pivotPoint * 2 + } + + if (pivotIndex < index) { + return (pivotPoint + 1) * 2 + } +} + +/** + * Inserts an element at an index within the vector. + * + * Does not allow duplicates, will throw an error if there is already an entry + * for this index. + * + * @param {Number} insertIdx - The index at which the element should be inserted. + * @param {Number} val - The value to be inserted into the vector. + */ +lunr.Vector.prototype.insert = function (insertIdx, val) { + this.upsert(insertIdx, val, function () { + throw "duplicate index" + }) +} + +/** + * Inserts or updates an existing index within the vector. + * + * @param {Number} insertIdx - The index at which the element should be inserted. + * @param {Number} val - The value to be inserted into the vector. + * @param {function} fn - A function that is called for updates, the existing value and the + * requested value are passed as arguments + */ +lunr.Vector.prototype.upsert = function (insertIdx, val, fn) { + this._magnitude = 0 + var position = this.positionForIndex(insertIdx) + + if (this.elements[position] == insertIdx) { + this.elements[position + 1] = fn(this.elements[position + 1], val) + } else { + this.elements.splice(position, 0, insertIdx, val) + } +} + +/** + * Calculates the magnitude of this vector. + * + * @returns {Number} + */ +lunr.Vector.prototype.magnitude = function () { + if (this._magnitude) return this._magnitude + + var sumOfSquares = 0, + elementsLength = this.elements.length + + for (var i = 1; i < elementsLength; i += 2) { + var val = this.elements[i] + sumOfSquares += val * val + } + + return this._magnitude = Math.sqrt(sumOfSquares) +} + +/** + * Calculates the dot product of this vector and another vector. + * + * @param {lunr.Vector} otherVector - The vector to compute the dot product with. + * @returns {Number} + */ +lunr.Vector.prototype.dot = function (otherVector) { + var dotProduct = 0, + a = this.elements, b = otherVector.elements, + aLen = a.length, bLen = b.length, + aVal = 0, bVal = 0, + i = 0, j = 0 + + while (i < aLen && j < bLen) { + aVal = a[i], bVal = b[j] + if (aVal < bVal) { + i += 2 + } else if (aVal > bVal) { + j += 2 + } else if (aVal == bVal) { + dotProduct += a[i + 1] * b[j + 1] + i += 2 + j += 2 + } + } + + return dotProduct +} + +/** + * Calculates the similarity between this vector and another vector. + * + * @param {lunr.Vector} otherVector - The other vector to calculate the + * similarity with. + * @returns {Number} + */ +lunr.Vector.prototype.similarity = function (otherVector) { + return this.dot(otherVector) / this.magnitude() || 0 +} + +/** + * Converts the vector to an array of the elements within the vector. + * + * @returns {Number[]} + */ +lunr.Vector.prototype.toArray = function () { + var output = new Array (this.elements.length / 2) + + for (var i = 1, j = 0; i < this.elements.length; i += 2, j++) { + output[j] = this.elements[i] + } + + return output +} + +/** + * A JSON serializable representation of the vector. + * + * @returns {Number[]} + */ +lunr.Vector.prototype.toJSON = function () { + return this.elements +} +/* eslint-disable */ +/*! + * lunr.stemmer + * Copyright (C) 2020 Oliver Nightingale + * Includes code from - http://tartarus.org/~martin/PorterStemmer/js.txt + */ + +/** + * lunr.stemmer is an english language stemmer, this is a JavaScript + * implementation of the PorterStemmer taken from http://tartarus.org/~martin + * + * @static + * @implements {lunr.PipelineFunction} + * @param {lunr.Token} token - The string to stem + * @returns {lunr.Token} + * @see {@link lunr.Pipeline} + * @function + */ +lunr.stemmer = (function(){ + var step2list = { + "ational" : "ate", + "tional" : "tion", + "enci" : "ence", + "anci" : "ance", + "izer" : "ize", + "bli" : "ble", + "alli" : "al", + "entli" : "ent", + "eli" : "e", + "ousli" : "ous", + "ization" : "ize", + "ation" : "ate", + "ator" : "ate", + "alism" : "al", + "iveness" : "ive", + "fulness" : "ful", + "ousness" : "ous", + "aliti" : "al", + "iviti" : "ive", + "biliti" : "ble", + "logi" : "log" + }, + + step3list = { + "icate" : "ic", + "ative" : "", + "alize" : "al", + "iciti" : "ic", + "ical" : "ic", + "ful" : "", + "ness" : "" + }, + + c = "[^aeiou]", // consonant + v = "[aeiouy]", // vowel + C = c + "[^aeiouy]*", // consonant sequence + V = v + "[aeiou]*", // vowel sequence + + mgr0 = "^(" + C + ")?" + V + C, // [C]VC... is m>0 + meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$", // [C]VC[V] is m=1 + mgr1 = "^(" + C + ")?" + V + C + V + C, // [C]VCVC... is m>1 + s_v = "^(" + C + ")?" + v; // vowel in stem + + var re_mgr0 = new RegExp(mgr0); + var re_mgr1 = new RegExp(mgr1); + var re_meq1 = new RegExp(meq1); + var re_s_v = new RegExp(s_v); + + var re_1a = /^(.+?)(ss|i)es$/; + var re2_1a = /^(.+?)([^s])s$/; + var re_1b = /^(.+?)eed$/; + var re2_1b = /^(.+?)(ed|ing)$/; + var re_1b_2 = /.$/; + var re2_1b_2 = /(at|bl|iz)$/; + var re3_1b_2 = new RegExp("([^aeiouylsz])\\1$"); + var re4_1b_2 = new RegExp("^" + C + v + "[^aeiouwxy]$"); + + var re_1c = /^(.+?[^aeiou])y$/; + var re_2 = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/; + + var re_3 = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/; + + var re_4 = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/; + var re2_4 = /^(.+?)(s|t)(ion)$/; + + var re_5 = /^(.+?)e$/; + var re_5_1 = /ll$/; + var re3_5 = new RegExp("^" + C + v + "[^aeiouwxy]$"); + + var porterStemmer = function porterStemmer(w) { + var stem, + suffix, + firstch, + re, + re2, + re3, + re4; + + if (w.length < 3) { return w; } + + firstch = w.substr(0,1); + if (firstch == "y") { + w = firstch.toUpperCase() + w.substr(1); + } + + // Step 1a + re = re_1a + re2 = re2_1a; + + if (re.test(w)) { w = w.replace(re,"$1$2"); } + else if (re2.test(w)) { w = w.replace(re2,"$1$2"); } + + // Step 1b + re = re_1b; + re2 = re2_1b; + if (re.test(w)) { + var fp = re.exec(w); + re = re_mgr0; + if (re.test(fp[1])) { + re = re_1b_2; + w = w.replace(re,""); + } + } else if (re2.test(w)) { + var fp = re2.exec(w); + stem = fp[1]; + re2 = re_s_v; + if (re2.test(stem)) { + w = stem; + re2 = re2_1b_2; + re3 = re3_1b_2; + re4 = re4_1b_2; + if (re2.test(w)) { w = w + "e"; } + else if (re3.test(w)) { re = re_1b_2; w = w.replace(re,""); } + else if (re4.test(w)) { w = w + "e"; } + } + } + + // Step 1c - replace suffix y or Y by i if preceded by a non-vowel which is not the first letter of the word (so cry -> cri, by -> by, say -> say) + re = re_1c; + if (re.test(w)) { + var fp = re.exec(w); + stem = fp[1]; + w = stem + "i"; + } + + // Step 2 + re = re_2; + if (re.test(w)) { + var fp = re.exec(w); + stem = fp[1]; + suffix = fp[2]; + re = re_mgr0; + if (re.test(stem)) { + w = stem + step2list[suffix]; + } + } + + // Step 3 + re = re_3; + if (re.test(w)) { + var fp = re.exec(w); + stem = fp[1]; + suffix = fp[2]; + re = re_mgr0; + if (re.test(stem)) { + w = stem + step3list[suffix]; + } + } + + // Step 4 + re = re_4; + re2 = re2_4; + if (re.test(w)) { + var fp = re.exec(w); + stem = fp[1]; + re = re_mgr1; + if (re.test(stem)) { + w = stem; + } + } else if (re2.test(w)) { + var fp = re2.exec(w); + stem = fp[1] + fp[2]; + re2 = re_mgr1; + if (re2.test(stem)) { + w = stem; + } + } + + // Step 5 + re = re_5; + if (re.test(w)) { + var fp = re.exec(w); + stem = fp[1]; + re = re_mgr1; + re2 = re_meq1; + re3 = re3_5; + if (re.test(stem) || (re2.test(stem) && !(re3.test(stem)))) { + w = stem; + } + } + + re = re_5_1; + re2 = re_mgr1; + if (re.test(w) && re2.test(w)) { + re = re_1b_2; + w = w.replace(re,""); + } + + // and turn initial Y back to y + + if (firstch == "y") { + w = firstch.toLowerCase() + w.substr(1); + } + + return w; + }; + + return function (token) { + return token.update(porterStemmer); + } +})(); + +lunr.Pipeline.registerFunction(lunr.stemmer, 'stemmer') +/*! + * lunr.stopWordFilter + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * lunr.generateStopWordFilter builds a stopWordFilter function from the provided + * list of stop words. + * + * The built in lunr.stopWordFilter is built using this generator and can be used + * to generate custom stopWordFilters for applications or non English languages. + * + * @function + * @param {Array} token The token to pass through the filter + * @returns {lunr.PipelineFunction} + * @see lunr.Pipeline + * @see lunr.stopWordFilter + */ +lunr.generateStopWordFilter = function (stopWords) { + var words = stopWords.reduce(function (memo, stopWord) { + memo[stopWord] = stopWord + return memo + }, {}) + + return function (token) { + if (token && words[token.toString()] !== token.toString()) return token + } +} + +/** + * lunr.stopWordFilter is an English language stop word list filter, any words + * contained in the list will not be passed through the filter. + * + * This is intended to be used in the Pipeline. If the token does not pass the + * filter then undefined will be returned. + * + * @function + * @implements {lunr.PipelineFunction} + * @params {lunr.Token} token - A token to check for being a stop word. + * @returns {lunr.Token} + * @see {@link lunr.Pipeline} + */ +lunr.stopWordFilter = lunr.generateStopWordFilter([ + 'a', + 'able', + 'about', + 'across', + 'after', + 'all', + 'almost', + 'also', + 'am', + 'among', + 'an', + 'and', + 'any', + 'are', + 'as', + 'at', + 'be', + 'because', + 'been', + 'but', + 'by', + 'can', + 'cannot', + 'could', + 'dear', + 'did', + 'do', + 'does', + 'either', + 'else', + 'ever', + 'every', + 'for', + 'from', + 'get', + 'got', + 'had', + 'has', + 'have', + 'he', + 'her', + 'hers', + 'him', + 'his', + 'how', + 'however', + 'i', + 'if', + 'in', + 'into', + 'is', + 'it', + 'its', + 'just', + 'least', + 'let', + 'like', + 'likely', + 'may', + 'me', + 'might', + 'most', + 'must', + 'my', + 'neither', + 'no', + 'nor', + 'not', + 'of', + 'off', + 'often', + 'on', + 'only', + 'or', + 'other', + 'our', + 'own', + 'rather', + 'said', + 'say', + 'says', + 'she', + 'should', + 'since', + 'so', + 'some', + 'than', + 'that', + 'the', + 'their', + 'them', + 'then', + 'there', + 'these', + 'they', + 'this', + 'tis', + 'to', + 'too', + 'twas', + 'us', + 'wants', + 'was', + 'we', + 'were', + 'what', + 'when', + 'where', + 'which', + 'while', + 'who', + 'whom', + 'why', + 'will', + 'with', + 'would', + 'yet', + 'you', + 'your' +]) + +lunr.Pipeline.registerFunction(lunr.stopWordFilter, 'stopWordFilter') +/*! + * lunr.trimmer + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * lunr.trimmer is a pipeline function for trimming non word + * characters from the beginning and end of tokens before they + * enter the index. + * + * This implementation may not work correctly for non latin + * characters and should either be removed or adapted for use + * with languages with non-latin characters. + * + * @static + * @implements {lunr.PipelineFunction} + * @param {lunr.Token} token The token to pass through the filter + * @returns {lunr.Token} + * @see lunr.Pipeline + */ +lunr.trimmer = function (token) { + return token.update(function (s) { + return s.replace(/^\W+/, '').replace(/\W+$/, '') + }) +} + +lunr.Pipeline.registerFunction(lunr.trimmer, 'trimmer') +/*! + * lunr.TokenSet + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * A token set is used to store the unique list of all tokens + * within an index. Token sets are also used to represent an + * incoming query to the index, this query token set and index + * token set are then intersected to find which tokens to look + * up in the inverted index. + * + * A token set can hold multiple tokens, as in the case of the + * index token set, or it can hold a single token as in the + * case of a simple query token set. + * + * Additionally token sets are used to perform wildcard matching. + * Leading, contained and trailing wildcards are supported, and + * from this edit distance matching can also be provided. + * + * Token sets are implemented as a minimal finite state automata, + * where both common prefixes and suffixes are shared between tokens. + * This helps to reduce the space used for storing the token set. + * + * @constructor + */ +lunr.TokenSet = function () { + this.final = false + this.edges = {} + this.id = lunr.TokenSet._nextId + lunr.TokenSet._nextId += 1 +} + +/** + * Keeps track of the next, auto increment, identifier to assign + * to a new tokenSet. + * + * TokenSets require a unique identifier to be correctly minimised. + * + * @private + */ +lunr.TokenSet._nextId = 1 + +/** + * Creates a TokenSet instance from the given sorted array of words. + * + * @param {String[]} arr - A sorted array of strings to create the set from. + * @returns {lunr.TokenSet} + * @throws Will throw an error if the input array is not sorted. + */ +lunr.TokenSet.fromArray = function (arr) { + var builder = new lunr.TokenSet.Builder + + for (var i = 0, len = arr.length; i < len; i++) { + builder.insert(arr[i]) + } + + builder.finish() + return builder.root +} + +/** + * Creates a token set from a query clause. + * + * @private + * @param {Object} clause - A single clause from lunr.Query. + * @param {string} clause.term - The query clause term. + * @param {number} [clause.editDistance] - The optional edit distance for the term. + * @returns {lunr.TokenSet} + */ +lunr.TokenSet.fromClause = function (clause) { + if ('editDistance' in clause) { + return lunr.TokenSet.fromFuzzyString(clause.term, clause.editDistance) + } else { + return lunr.TokenSet.fromString(clause.term) + } +} + +/** + * Creates a token set representing a single string with a specified + * edit distance. + * + * Insertions, deletions, substitutions and transpositions are each + * treated as an edit distance of 1. + * + * Increasing the allowed edit distance will have a dramatic impact + * on the performance of both creating and intersecting these TokenSets. + * It is advised to keep the edit distance less than 3. + * + * @param {string} str - The string to create the token set from. + * @param {number} editDistance - The allowed edit distance to match. + * @returns {lunr.Vector} + */ +lunr.TokenSet.fromFuzzyString = function (str, editDistance) { + var root = new lunr.TokenSet + + var stack = [{ + node: root, + editsRemaining: editDistance, + str: str + }] + + while (stack.length) { + var frame = stack.pop() + + // no edit + if (frame.str.length > 0) { + var char = frame.str.charAt(0), + noEditNode + + if (char in frame.node.edges) { + noEditNode = frame.node.edges[char] + } else { + noEditNode = new lunr.TokenSet + frame.node.edges[char] = noEditNode + } + + if (frame.str.length == 1) { + noEditNode.final = true + } + + stack.push({ + node: noEditNode, + editsRemaining: frame.editsRemaining, + str: frame.str.slice(1) + }) + } + + if (frame.editsRemaining == 0) { + continue + } + + // insertion + if ("*" in frame.node.edges) { + var insertionNode = frame.node.edges["*"] + } else { + var insertionNode = new lunr.TokenSet + frame.node.edges["*"] = insertionNode + } + + if (frame.str.length == 0) { + insertionNode.final = true + } + + stack.push({ + node: insertionNode, + editsRemaining: frame.editsRemaining - 1, + str: frame.str + }) + + // deletion + // can only do a deletion if we have enough edits remaining + // and if there are characters left to delete in the string + if (frame.str.length > 1) { + stack.push({ + node: frame.node, + editsRemaining: frame.editsRemaining - 1, + str: frame.str.slice(1) + }) + } + + // deletion + // just removing the last character from the str + if (frame.str.length == 1) { + frame.node.final = true + } + + // substitution + // can only do a substitution if we have enough edits remaining + // and if there are characters left to substitute + if (frame.str.length >= 1) { + if ("*" in frame.node.edges) { + var substitutionNode = frame.node.edges["*"] + } else { + var substitutionNode = new lunr.TokenSet + frame.node.edges["*"] = substitutionNode + } + + if (frame.str.length == 1) { + substitutionNode.final = true + } + + stack.push({ + node: substitutionNode, + editsRemaining: frame.editsRemaining - 1, + str: frame.str.slice(1) + }) + } + + // transposition + // can only do a transposition if there are edits remaining + // and there are enough characters to transpose + if (frame.str.length > 1) { + var charA = frame.str.charAt(0), + charB = frame.str.charAt(1), + transposeNode + + if (charB in frame.node.edges) { + transposeNode = frame.node.edges[charB] + } else { + transposeNode = new lunr.TokenSet + frame.node.edges[charB] = transposeNode + } + + if (frame.str.length == 1) { + transposeNode.final = true + } + + stack.push({ + node: transposeNode, + editsRemaining: frame.editsRemaining - 1, + str: charA + frame.str.slice(2) + }) + } + } + + return root +} + +/** + * Creates a TokenSet from a string. + * + * The string may contain one or more wildcard characters (*) + * that will allow wildcard matching when intersecting with + * another TokenSet. + * + * @param {string} str - The string to create a TokenSet from. + * @returns {lunr.TokenSet} + */ +lunr.TokenSet.fromString = function (str) { + var node = new lunr.TokenSet, + root = node + + /* + * Iterates through all characters within the passed string + * appending a node for each character. + * + * When a wildcard character is found then a self + * referencing edge is introduced to continually match + * any number of any characters. + */ + for (var i = 0, len = str.length; i < len; i++) { + var char = str[i], + final = (i == len - 1) + + if (char == "*") { + node.edges[char] = node + node.final = final + + } else { + var next = new lunr.TokenSet + next.final = final + + node.edges[char] = next + node = next + } + } + + return root +} + +/** + * Converts this TokenSet into an array of strings + * contained within the TokenSet. + * + * This is not intended to be used on a TokenSet that + * contains wildcards, in these cases the results are + * undefined and are likely to cause an infinite loop. + * + * @returns {string[]} + */ +lunr.TokenSet.prototype.toArray = function () { + var words = [] + + var stack = [{ + prefix: "", + node: this + }] + + while (stack.length) { + var frame = stack.pop(), + edges = Object.keys(frame.node.edges), + len = edges.length + + if (frame.node.final) { + /* In Safari, at this point the prefix is sometimes corrupted, see: + * https://github.com/olivernn/lunr.js/issues/279 Calling any + * String.prototype method forces Safari to "cast" this string to what + * it's supposed to be, fixing the bug. */ + frame.prefix.charAt(0) + words.push(frame.prefix) + } + + for (var i = 0; i < len; i++) { + var edge = edges[i] + + stack.push({ + prefix: frame.prefix.concat(edge), + node: frame.node.edges[edge] + }) + } + } + + return words +} + +/** + * Generates a string representation of a TokenSet. + * + * This is intended to allow TokenSets to be used as keys + * in objects, largely to aid the construction and minimisation + * of a TokenSet. As such it is not designed to be a human + * friendly representation of the TokenSet. + * + * @returns {string} + */ +lunr.TokenSet.prototype.toString = function () { + // NOTE: Using Object.keys here as this.edges is very likely + // to enter 'hash-mode' with many keys being added + // + // avoiding a for-in loop here as it leads to the function + // being de-optimised (at least in V8). From some simple + // benchmarks the performance is comparable, but allowing + // V8 to optimize may mean easy performance wins in the future. + + if (this._str) { + return this._str + } + + var str = this.final ? '1' : '0', + labels = Object.keys(this.edges).sort(), + len = labels.length + + for (var i = 0; i < len; i++) { + var label = labels[i], + node = this.edges[label] + + str = str + label + node.id + } + + return str +} + +/** + * Returns a new TokenSet that is the intersection of + * this TokenSet and the passed TokenSet. + * + * This intersection will take into account any wildcards + * contained within the TokenSet. + * + * @param {lunr.TokenSet} b - An other TokenSet to intersect with. + * @returns {lunr.TokenSet} + */ +lunr.TokenSet.prototype.intersect = function (b) { + var output = new lunr.TokenSet, + frame = undefined + + var stack = [{ + qNode: b, + output: output, + node: this + }] + + while (stack.length) { + frame = stack.pop() + + // NOTE: As with the #toString method, we are using + // Object.keys and a for loop instead of a for-in loop + // as both of these objects enter 'hash' mode, causing + // the function to be de-optimised in V8 + var qEdges = Object.keys(frame.qNode.edges), + qLen = qEdges.length, + nEdges = Object.keys(frame.node.edges), + nLen = nEdges.length + + for (var q = 0; q < qLen; q++) { + var qEdge = qEdges[q] + + for (var n = 0; n < nLen; n++) { + var nEdge = nEdges[n] + + if (nEdge == qEdge || qEdge == '*') { + var node = frame.node.edges[nEdge], + qNode = frame.qNode.edges[qEdge], + final = node.final && qNode.final, + next = undefined + + if (nEdge in frame.output.edges) { + // an edge already exists for this character + // no need to create a new node, just set the finality + // bit unless this node is already final + next = frame.output.edges[nEdge] + next.final = next.final || final + + } else { + // no edge exists yet, must create one + // set the finality bit and insert it + // into the output + next = new lunr.TokenSet + next.final = final + frame.output.edges[nEdge] = next + } + + stack.push({ + qNode: qNode, + output: next, + node: node + }) + } + } + } + } + + return output +} +lunr.TokenSet.Builder = function () { + this.previousWord = "" + this.root = new lunr.TokenSet + this.uncheckedNodes = [] + this.minimizedNodes = {} +} + +lunr.TokenSet.Builder.prototype.insert = function (word) { + var node, + commonPrefix = 0 + + if (word < this.previousWord) { + throw new Error ("Out of order word insertion") + } + + for (var i = 0; i < word.length && i < this.previousWord.length; i++) { + if (word[i] != this.previousWord[i]) break + commonPrefix++ + } + + this.minimize(commonPrefix) + + if (this.uncheckedNodes.length == 0) { + node = this.root + } else { + node = this.uncheckedNodes[this.uncheckedNodes.length - 1].child + } + + for (var i = commonPrefix; i < word.length; i++) { + var nextNode = new lunr.TokenSet, + char = word[i] + + node.edges[char] = nextNode + + this.uncheckedNodes.push({ + parent: node, + char: char, + child: nextNode + }) + + node = nextNode + } + + node.final = true + this.previousWord = word +} + +lunr.TokenSet.Builder.prototype.finish = function () { + this.minimize(0) +} + +lunr.TokenSet.Builder.prototype.minimize = function (downTo) { + for (var i = this.uncheckedNodes.length - 1; i >= downTo; i--) { + var node = this.uncheckedNodes[i], + childKey = node.child.toString() + + if (childKey in this.minimizedNodes) { + node.parent.edges[node.char] = this.minimizedNodes[childKey] + } else { + // Cache the key for this node since + // we know it can't change anymore + node.child._str = childKey + + this.minimizedNodes[childKey] = node.child + } + + this.uncheckedNodes.pop() + } +} +/*! + * lunr.Index + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * An index contains the built index of all documents and provides a query interface + * to the index. + * + * Usually instances of lunr.Index will not be created using this constructor, instead + * lunr.Builder should be used to construct new indexes, or lunr.Index.load should be + * used to load previously built and serialized indexes. + * + * @constructor + * @param {Object} attrs - The attributes of the built search index. + * @param {Object} attrs.invertedIndex - An index of term/field to document reference. + * @param {Object} attrs.fieldVectors - Field vectors + * @param {lunr.TokenSet} attrs.tokenSet - An set of all corpus tokens. + * @param {string[]} attrs.fields - The names of indexed document fields. + * @param {lunr.Pipeline} attrs.pipeline - The pipeline to use for search terms. + */ +lunr.Index = function (attrs) { + this.invertedIndex = attrs.invertedIndex + this.fieldVectors = attrs.fieldVectors + this.tokenSet = attrs.tokenSet + this.fields = attrs.fields + this.pipeline = attrs.pipeline +} + +/** + * A result contains details of a document matching a search query. + * @typedef {Object} lunr.Index~Result + * @property {string} ref - The reference of the document this result represents. + * @property {number} score - A number between 0 and 1 representing how similar this document is to the query. + * @property {lunr.MatchData} matchData - Contains metadata about this match including which term(s) caused the match. + */ + +/** + * Although lunr provides the ability to create queries using lunr.Query, it also provides a simple + * query language which itself is parsed into an instance of lunr.Query. + * + * For programmatically building queries it is advised to directly use lunr.Query, the query language + * is best used for human entered text rather than program generated text. + * + * At its simplest queries can just be a single term, e.g. `hello`, multiple terms are also supported + * and will be combined with OR, e.g `hello world` will match documents that contain either 'hello' + * or 'world', though those that contain both will rank higher in the results. + * + * Wildcards can be included in terms to match one or more unspecified characters, these wildcards can + * be inserted anywhere within the term, and more than one wildcard can exist in a single term. Adding + * wildcards will increase the number of documents that will be found but can also have a negative + * impact on query performance, especially with wildcards at the beginning of a term. + * + * Terms can be restricted to specific fields, e.g. `title:hello`, only documents with the term + * hello in the title field will match this query. Using a field not present in the index will lead + * to an error being thrown. + * + * Modifiers can also be added to terms, lunr supports edit distance and boost modifiers on terms. A term + * boost will make documents matching that term score higher, e.g. `foo^5`. Edit distance is also supported + * to provide fuzzy matching, e.g. 'hello~2' will match documents with hello with an edit distance of 2. + * Avoid large values for edit distance to improve query performance. + * + * Each term also supports a presence modifier. By default a term's presence in document is optional, however + * this can be changed to either required or prohibited. For a term's presence to be required in a document the + * term should be prefixed with a '+', e.g. `+foo bar` is a search for documents that must contain 'foo' and + * optionally contain 'bar'. Conversely a leading '-' sets the terms presence to prohibited, i.e. it must not + * appear in a document, e.g. `-foo bar` is a search for documents that do not contain 'foo' but may contain 'bar'. + * + * To escape special characters the backslash character '\' can be used, this allows searches to include + * characters that would normally be considered modifiers, e.g. `foo\~2` will search for a term "foo~2" instead + * of attempting to apply a boost of 2 to the search term "foo". + * + * @typedef {string} lunr.Index~QueryString + * @example Simple single term query + * hello + * @example Multiple term query + * hello world + * @example term scoped to a field + * title:hello + * @example term with a boost of 10 + * hello^10 + * @example term with an edit distance of 2 + * hello~2 + * @example terms with presence modifiers + * -foo +bar baz + */ + +/** + * Performs a search against the index using lunr query syntax. + * + * Results will be returned sorted by their score, the most relevant results + * will be returned first. For details on how the score is calculated, please see + * the {@link https://lunrjs.com/guides/searching.html#scoring|guide}. + * + * For more programmatic querying use lunr.Index#query. + * + * @param {lunr.Index~QueryString} queryString - A string containing a lunr query. + * @throws {lunr.QueryParseError} If the passed query string cannot be parsed. + * @returns {lunr.Index~Result[]} + */ +lunr.Index.prototype.search = function (queryString) { + return this.query(function (query) { + var parser = new lunr.QueryParser(queryString, query) + parser.parse() + }) +} + +/** + * A query builder callback provides a query object to be used to express + * the query to perform on the index. + * + * @callback lunr.Index~queryBuilder + * @param {lunr.Query} query - The query object to build up. + * @this lunr.Query + */ + +/** + * Performs a query against the index using the yielded lunr.Query object. + * + * If performing programmatic queries against the index, this method is preferred + * over lunr.Index#search so as to avoid the additional query parsing overhead. + * + * A query object is yielded to the supplied function which should be used to + * express the query to be run against the index. + * + * Note that although this function takes a callback parameter it is _not_ an + * asynchronous operation, the callback is just yielded a query object to be + * customized. + * + * @param {lunr.Index~queryBuilder} fn - A function that is used to build the query. + * @returns {lunr.Index~Result[]} + */ +lunr.Index.prototype.query = function (fn) { + // for each query clause + // * process terms + // * expand terms from token set + // * find matching documents and metadata + // * get document vectors + // * score documents + + var query = new lunr.Query(this.fields), + matchingFields = Object.create(null), + queryVectors = Object.create(null), + termFieldCache = Object.create(null), + requiredMatches = Object.create(null), + prohibitedMatches = Object.create(null) + + /* + * To support field level boosts a query vector is created per + * field. An empty vector is eagerly created to support negated + * queries. + */ + for (var i = 0; i < this.fields.length; i++) { + queryVectors[this.fields[i]] = new lunr.Vector + } + + fn.call(query, query) + + for (var i = 0; i < query.clauses.length; i++) { + /* + * Unless the pipeline has been disabled for this term, which is + * the case for terms with wildcards, we need to pass the clause + * term through the search pipeline. A pipeline returns an array + * of processed terms. Pipeline functions may expand the passed + * term, which means we may end up performing multiple index lookups + * for a single query term. + */ + var clause = query.clauses[i], + terms = null, + clauseMatches = lunr.Set.empty + + if (clause.usePipeline) { + terms = this.pipeline.runString(clause.term, { + fields: clause.fields + }) + } else { + terms = [clause.term] + } + + for (var m = 0; m < terms.length; m++) { + var term = terms[m] + + /* + * Each term returned from the pipeline needs to use the same query + * clause object, e.g. the same boost and or edit distance. The + * simplest way to do this is to re-use the clause object but mutate + * its term property. + */ + clause.term = term + + /* + * From the term in the clause we create a token set which will then + * be used to intersect the indexes token set to get a list of terms + * to lookup in the inverted index + */ + var termTokenSet = lunr.TokenSet.fromClause(clause), + expandedTerms = this.tokenSet.intersect(termTokenSet).toArray() + + /* + * If a term marked as required does not exist in the tokenSet it is + * impossible for the search to return any matches. We set all the field + * scoped required matches set to empty and stop examining any further + * clauses. + */ + if (expandedTerms.length === 0 && clause.presence === lunr.Query.presence.REQUIRED) { + for (var k = 0; k < clause.fields.length; k++) { + var field = clause.fields[k] + requiredMatches[field] = lunr.Set.empty + } + + break + } + + for (var j = 0; j < expandedTerms.length; j++) { + /* + * For each term get the posting and termIndex, this is required for + * building the query vector. + */ + var expandedTerm = expandedTerms[j], + posting = this.invertedIndex[expandedTerm], + termIndex = posting._index + + for (var k = 0; k < clause.fields.length; k++) { + /* + * For each field that this query term is scoped by (by default + * all fields are in scope) we need to get all the document refs + * that have this term in that field. + * + * The posting is the entry in the invertedIndex for the matching + * term from above. + */ + var field = clause.fields[k], + fieldPosting = posting[field], + matchingDocumentRefs = Object.keys(fieldPosting), + termField = expandedTerm + "/" + field, + matchingDocumentsSet = new lunr.Set(matchingDocumentRefs) + + /* + * if the presence of this term is required ensure that the matching + * documents are added to the set of required matches for this clause. + * + */ + if (clause.presence == lunr.Query.presence.REQUIRED) { + clauseMatches = clauseMatches.union(matchingDocumentsSet) + + if (requiredMatches[field] === undefined) { + requiredMatches[field] = lunr.Set.complete + } + } + + /* + * if the presence of this term is prohibited ensure that the matching + * documents are added to the set of prohibited matches for this field, + * creating that set if it does not yet exist. + */ + if (clause.presence == lunr.Query.presence.PROHIBITED) { + if (prohibitedMatches[field] === undefined) { + prohibitedMatches[field] = lunr.Set.empty + } + + prohibitedMatches[field] = prohibitedMatches[field].union(matchingDocumentsSet) + + /* + * Prohibited matches should not be part of the query vector used for + * similarity scoring and no metadata should be extracted so we continue + * to the next field + */ + continue + } + + /* + * The query field vector is populated using the termIndex found for + * the term and a unit value with the appropriate boost applied. + * Using upsert because there could already be an entry in the vector + * for the term we are working with. In that case we just add the scores + * together. + */ + queryVectors[field].upsert(termIndex, clause.boost, function (a, b) { return a + b }) + + /** + * If we've already seen this term, field combo then we've already collected + * the matching documents and metadata, no need to go through all that again + */ + if (termFieldCache[termField]) { + continue + } + + for (var l = 0; l < matchingDocumentRefs.length; l++) { + /* + * All metadata for this term/field/document triple + * are then extracted and collected into an instance + * of lunr.MatchData ready to be returned in the query + * results + */ + var matchingDocumentRef = matchingDocumentRefs[l], + matchingFieldRef = new lunr.FieldRef (matchingDocumentRef, field), + metadata = fieldPosting[matchingDocumentRef], + fieldMatch + + if ((fieldMatch = matchingFields[matchingFieldRef]) === undefined) { + matchingFields[matchingFieldRef] = new lunr.MatchData (expandedTerm, field, metadata) + } else { + fieldMatch.add(expandedTerm, field, metadata) + } + + } + + termFieldCache[termField] = true + } + } + } + + /** + * If the presence was required we need to update the requiredMatches field sets. + * We do this after all fields for the term have collected their matches because + * the clause terms presence is required in _any_ of the fields not _all_ of the + * fields. + */ + if (clause.presence === lunr.Query.presence.REQUIRED) { + for (var k = 0; k < clause.fields.length; k++) { + var field = clause.fields[k] + requiredMatches[field] = requiredMatches[field].intersect(clauseMatches) + } + } + } + + /** + * Need to combine the field scoped required and prohibited + * matching documents into a global set of required and prohibited + * matches + */ + var allRequiredMatches = lunr.Set.complete, + allProhibitedMatches = lunr.Set.empty + + for (var i = 0; i < this.fields.length; i++) { + var field = this.fields[i] + + if (requiredMatches[field]) { + allRequiredMatches = allRequiredMatches.intersect(requiredMatches[field]) + } + + if (prohibitedMatches[field]) { + allProhibitedMatches = allProhibitedMatches.union(prohibitedMatches[field]) + } + } + + var matchingFieldRefs = Object.keys(matchingFields), + results = [], + matches = Object.create(null) + + /* + * If the query is negated (contains only prohibited terms) + * we need to get _all_ fieldRefs currently existing in the + * index. This is only done when we know that the query is + * entirely prohibited terms to avoid any cost of getting all + * fieldRefs unnecessarily. + * + * Additionally, blank MatchData must be created to correctly + * populate the results. + */ + if (query.isNegated()) { + matchingFieldRefs = Object.keys(this.fieldVectors) + + for (var i = 0; i < matchingFieldRefs.length; i++) { + var matchingFieldRef = matchingFieldRefs[i] + var fieldRef = lunr.FieldRef.fromString(matchingFieldRef) + matchingFields[matchingFieldRef] = new lunr.MatchData + } + } + + for (var i = 0; i < matchingFieldRefs.length; i++) { + /* + * Currently we have document fields that match the query, but we + * need to return documents. The matchData and scores are combined + * from multiple fields belonging to the same document. + * + * Scores are calculated by field, using the query vectors created + * above, and combined into a final document score using addition. + */ + var fieldRef = lunr.FieldRef.fromString(matchingFieldRefs[i]), + docRef = fieldRef.docRef + + if (!allRequiredMatches.contains(docRef)) { + continue + } + + if (allProhibitedMatches.contains(docRef)) { + continue + } + + var fieldVector = this.fieldVectors[fieldRef], + score = queryVectors[fieldRef.fieldName].similarity(fieldVector), + docMatch + + if ((docMatch = matches[docRef]) !== undefined) { + docMatch.score += score + docMatch.matchData.combine(matchingFields[fieldRef]) + } else { + var match = { + ref: docRef, + score: score, + matchData: matchingFields[fieldRef] + } + matches[docRef] = match + results.push(match) + } + } + + /* + * Sort the results objects by score, highest first. + */ + return results.sort(function (a, b) { + return b.score - a.score + }) +} + +/** + * Prepares the index for JSON serialization. + * + * The schema for this JSON blob will be described in a + * separate JSON schema file. + * + * @returns {Object} + */ +lunr.Index.prototype.toJSON = function () { + var invertedIndex = Object.keys(this.invertedIndex) + .sort() + .map(function (term) { + return [term, this.invertedIndex[term]] + }, this) + + var fieldVectors = Object.keys(this.fieldVectors) + .map(function (ref) { + return [ref, this.fieldVectors[ref].toJSON()] + }, this) + + return { + version: lunr.version, + fields: this.fields, + fieldVectors: fieldVectors, + invertedIndex: invertedIndex, + pipeline: this.pipeline.toJSON() + } +} + +/** + * Loads a previously serialized lunr.Index + * + * @param {Object} serializedIndex - A previously serialized lunr.Index + * @returns {lunr.Index} + */ +lunr.Index.load = function (serializedIndex) { + var attrs = {}, + fieldVectors = {}, + serializedVectors = serializedIndex.fieldVectors, + invertedIndex = Object.create(null), + serializedInvertedIndex = serializedIndex.invertedIndex, + tokenSetBuilder = new lunr.TokenSet.Builder, + pipeline = lunr.Pipeline.load(serializedIndex.pipeline) + + if (serializedIndex.version != lunr.version) { + lunr.utils.warn("Version mismatch when loading serialised index. Current version of lunr '" + lunr.version + "' does not match serialized index '" + serializedIndex.version + "'") + } + + for (var i = 0; i < serializedVectors.length; i++) { + var tuple = serializedVectors[i], + ref = tuple[0], + elements = tuple[1] + + fieldVectors[ref] = new lunr.Vector(elements) + } + + for (var i = 0; i < serializedInvertedIndex.length; i++) { + var tuple = serializedInvertedIndex[i], + term = tuple[0], + posting = tuple[1] + + tokenSetBuilder.insert(term) + invertedIndex[term] = posting + } + + tokenSetBuilder.finish() + + attrs.fields = serializedIndex.fields + + attrs.fieldVectors = fieldVectors + attrs.invertedIndex = invertedIndex + attrs.tokenSet = tokenSetBuilder.root + attrs.pipeline = pipeline + + return new lunr.Index(attrs) +} +/*! + * lunr.Builder + * Copyright (C) 2020 Oliver Nightingale + */ + +/** + * lunr.Builder performs indexing on a set of documents and + * returns instances of lunr.Index ready for querying. + * + * All configuration of the index is done via the builder, the + * fields to index, the document reference, the text processing + * pipeline and document scoring parameters are all set on the + * builder before indexing. + * + * @constructor + * @property {string} _ref - Internal reference to the document reference field. + * @property {string[]} _fields - Internal reference to the document fields to index. + * @property {object} invertedIndex - The inverted index maps terms to document fields. + * @property {object} documentTermFrequencies - Keeps track of document term frequencies. + * @property {object} documentLengths - Keeps track of the length of documents added to the index. + * @property {lunr.tokenizer} tokenizer - Function for splitting strings into tokens for indexing. + * @property {lunr.Pipeline} pipeline - The pipeline performs text processing on tokens before indexing. + * @property {lunr.Pipeline} searchPipeline - A pipeline for processing search terms before querying the index. + * @property {number} documentCount - Keeps track of the total number of documents indexed. + * @property {number} _b - A parameter to control field length normalization, setting this to 0 disabled normalization, 1 fully normalizes field lengths, the default value is 0.75. + * @property {number} _k1 - A parameter to control how quickly an increase in term frequency results in term frequency saturation, the default value is 1.2. + * @property {number} termIndex - A counter incremented for each unique term, used to identify a terms position in the vector space. + * @property {array} metadataWhitelist - A list of metadata keys that have been whitelisted for entry in the index. + */ +lunr.Builder = function () { + this._ref = "id" + this._fields = Object.create(null) + this._documents = Object.create(null) + this.invertedIndex = Object.create(null) + this.fieldTermFrequencies = {} + this.fieldLengths = {} + this.tokenizer = lunr.tokenizer + this.pipeline = new lunr.Pipeline + this.searchPipeline = new lunr.Pipeline + this.documentCount = 0 + this._b = 0.75 + this._k1 = 1.2 + this.termIndex = 0 + this.metadataWhitelist = [] +} + +/** + * Sets the document field used as the document reference. Every document must have this field. + * The type of this field in the document should be a string, if it is not a string it will be + * coerced into a string by calling toString. + * + * The default ref is 'id'. + * + * The ref should _not_ be changed during indexing, it should be set before any documents are + * added to the index. Changing it during indexing can lead to inconsistent results. + * + * @param {string} ref - The name of the reference field in the document. + */ +lunr.Builder.prototype.ref = function (ref) { + this._ref = ref +} + +/** + * A function that is used to extract a field from a document. + * + * Lunr expects a field to be at the top level of a document, if however the field + * is deeply nested within a document an extractor function can be used to extract + * the right field for indexing. + * + * @callback fieldExtractor + * @param {object} doc - The document being added to the index. + * @returns {?(string|object|object[])} obj - The object that will be indexed for this field. + * @example Extracting a nested field + * function (doc) { return doc.nested.field } + */ + +/** + * Adds a field to the list of document fields that will be indexed. Every document being + * indexed should have this field. Null values for this field in indexed documents will + * not cause errors but will limit the chance of that document being retrieved by searches. + * + * All fields should be added before adding documents to the index. Adding fields after + * a document has been indexed will have no effect on already indexed documents. + * + * Fields can be boosted at build time. This allows terms within that field to have more + * importance when ranking search results. Use a field boost to specify that matches within + * one field are more important than other fields. + * + * @param {string} fieldName - The name of a field to index in all documents. + * @param {object} attributes - Optional attributes associated with this field. + * @param {number} [attributes.boost=1] - Boost applied to all terms within this field. + * @param {fieldExtractor} [attributes.extractor] - Function to extract a field from a document. + * @throws {RangeError} fieldName cannot contain unsupported characters '/' + */ +lunr.Builder.prototype.field = function (fieldName, attributes) { + if (/\//.test(fieldName)) { + throw new RangeError ("Field '" + fieldName + "' contains illegal character '/'") + } + + this._fields[fieldName] = attributes || {} +} + +/** + * A parameter to tune the amount of field length normalisation that is applied when + * calculating relevance scores. A value of 0 will completely disable any normalisation + * and a value of 1 will fully normalise field lengths. The default is 0.75. Values of b + * will be clamped to the range 0 - 1. + * + * @param {number} number - The value to set for this tuning parameter. + */ +lunr.Builder.prototype.b = function (number) { + if (number < 0) { + this._b = 0 + } else if (number > 1) { + this._b = 1 + } else { + this._b = number + } +} + +/** + * A parameter that controls the speed at which a rise in term frequency results in term + * frequency saturation. The default value is 1.2. Setting this to a higher value will give + * slower saturation levels, a lower value will result in quicker saturation. + * + * @param {number} number - The value to set for this tuning parameter. + */ +lunr.Builder.prototype.k1 = function (number) { + this._k1 = number +} + +/** + * Adds a document to the index. + * + * Before adding fields to the index the index should have been fully setup, with the document + * ref and all fields to index already having been specified. + * + * The document must have a field name as specified by the ref (by default this is 'id') and + * it should have all fields defined for indexing, though null or undefined values will not + * cause errors. + * + * Entire documents can be boosted at build time. Applying a boost to a document indicates that + * this document should rank higher in search results than other documents. + * + * @param {object} doc - The document to add to the index. + * @param {object} attributes - Optional attributes associated with this document. + * @param {number} [attributes.boost=1] - Boost applied to all terms within this document. + */ +lunr.Builder.prototype.add = function (doc, attributes) { + var docRef = doc[this._ref], + fields = Object.keys(this._fields) + + this._documents[docRef] = attributes || {} + this.documentCount += 1 + + for (var i = 0; i < fields.length; i++) { + var fieldName = fields[i], + extractor = this._fields[fieldName].extractor, + field = extractor ? extractor(doc) : doc[fieldName], + tokens = this.tokenizer(field, { + fields: [fieldName] + }), + terms = this.pipeline.run(tokens), + fieldRef = new lunr.FieldRef (docRef, fieldName), + fieldTerms = Object.create(null) + + this.fieldTermFrequencies[fieldRef] = fieldTerms + this.fieldLengths[fieldRef] = 0 + + // store the length of this field for this document + this.fieldLengths[fieldRef] += terms.length + + // calculate term frequencies for this field + for (var j = 0; j < terms.length; j++) { + var term = terms[j] + + if (fieldTerms[term] == undefined) { + fieldTerms[term] = 0 + } + + fieldTerms[term] += 1 + + // add to inverted index + // create an initial posting if one doesn't exist + if (this.invertedIndex[term] == undefined) { + var posting = Object.create(null) + posting["_index"] = this.termIndex + this.termIndex += 1 + + for (var k = 0; k < fields.length; k++) { + posting[fields[k]] = Object.create(null) + } + + this.invertedIndex[term] = posting + } + + // add an entry for this term/fieldName/docRef to the invertedIndex + if (this.invertedIndex[term][fieldName][docRef] == undefined) { + this.invertedIndex[term][fieldName][docRef] = Object.create(null) + } + + // store all whitelisted metadata about this token in the + // inverted index + for (var l = 0; l < this.metadataWhitelist.length; l++) { + var metadataKey = this.metadataWhitelist[l], + metadata = term.metadata[metadataKey] + + if (this.invertedIndex[term][fieldName][docRef][metadataKey] == undefined) { + this.invertedIndex[term][fieldName][docRef][metadataKey] = [] + } + + this.invertedIndex[term][fieldName][docRef][metadataKey].push(metadata) + } + } + + } +} + +/** + * Calculates the average document length for this index + * + * @private + */ +lunr.Builder.prototype.calculateAverageFieldLengths = function () { + + var fieldRefs = Object.keys(this.fieldLengths), + numberOfFields = fieldRefs.length, + accumulator = {}, + documentsWithField = {} + + for (var i = 0; i < numberOfFields; i++) { + var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]), + field = fieldRef.fieldName + + documentsWithField[field] || (documentsWithField[field] = 0) + documentsWithField[field] += 1 + + accumulator[field] || (accumulator[field] = 0) + accumulator[field] += this.fieldLengths[fieldRef] + } + + var fields = Object.keys(this._fields) + + for (var i = 0; i < fields.length; i++) { + var fieldName = fields[i] + accumulator[fieldName] = accumulator[fieldName] / documentsWithField[fieldName] + } + + this.averageFieldLength = accumulator +} + +/** + * Builds a vector space model of every document using lunr.Vector + * + * @private + */ +lunr.Builder.prototype.createFieldVectors = function () { + var fieldVectors = {}, + fieldRefs = Object.keys(this.fieldTermFrequencies), + fieldRefsLength = fieldRefs.length, + termIdfCache = Object.create(null) + + for (var i = 0; i < fieldRefsLength; i++) { + var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]), + fieldName = fieldRef.fieldName, + fieldLength = this.fieldLengths[fieldRef], + fieldVector = new lunr.Vector, + termFrequencies = this.fieldTermFrequencies[fieldRef], + terms = Object.keys(termFrequencies), + termsLength = terms.length + + + var fieldBoost = this._fields[fieldName].boost || 1, + docBoost = this._documents[fieldRef.docRef].boost || 1 + + for (var j = 0; j < termsLength; j++) { + var term = terms[j], + tf = termFrequencies[term], + termIndex = this.invertedIndex[term]._index, + idf, score, scoreWithPrecision + + if (termIdfCache[term] === undefined) { + idf = lunr.idf(this.invertedIndex[term], this.documentCount) + termIdfCache[term] = idf + } else { + idf = termIdfCache[term] + } + + score = idf * ((this._k1 + 1) * tf) / (this._k1 * (1 - this._b + this._b * (fieldLength / this.averageFieldLength[fieldName])) + tf) + score *= fieldBoost + score *= docBoost + scoreWithPrecision = Math.round(score * 1000) / 1000 + // Converts 1.23456789 to 1.234. + // Reducing the precision so that the vectors take up less + // space when serialised. Doing it now so that they behave + // the same before and after serialisation. Also, this is + // the fastest approach to reducing a number's precision in + // JavaScript. + + fieldVector.insert(termIndex, scoreWithPrecision) + } + + fieldVectors[fieldRef] = fieldVector + } + + this.fieldVectors = fieldVectors +} + +/** + * Creates a token set of all tokens in the index using lunr.TokenSet + * + * @private + */ +lunr.Builder.prototype.createTokenSet = function () { + this.tokenSet = lunr.TokenSet.fromArray( + Object.keys(this.invertedIndex).sort() + ) +} + +/** + * Builds the index, creating an instance of lunr.Index. + * + * This completes the indexing process and should only be called + * once all documents have been added to the index. + * + * @returns {lunr.Index} + */ +lunr.Builder.prototype.build = function () { + this.calculateAverageFieldLengths() + this.createFieldVectors() + this.createTokenSet() + + return new lunr.Index({ + invertedIndex: this.invertedIndex, + fieldVectors: this.fieldVectors, + tokenSet: this.tokenSet, + fields: Object.keys(this._fields), + pipeline: this.searchPipeline + }) +} + +/** + * Applies a plugin to the index builder. + * + * A plugin is a function that is called with the index builder as its context. + * Plugins can be used to customise or extend the behaviour of the index + * in some way. A plugin is just a function, that encapsulated the custom + * behaviour that should be applied when building the index. + * + * The plugin function will be called with the index builder as its argument, additional + * arguments can also be passed when calling use. The function will be called + * with the index builder as its context. + * + * @param {Function} plugin The plugin to apply. + */ +lunr.Builder.prototype.use = function (fn) { + var args = Array.prototype.slice.call(arguments, 1) + args.unshift(this) + fn.apply(this, args) +} +/** + * Contains and collects metadata about a matching document. + * A single instance of lunr.MatchData is returned as part of every + * lunr.Index~Result. + * + * @constructor + * @param {string} term - The term this match data is associated with + * @param {string} field - The field in which the term was found + * @param {object} metadata - The metadata recorded about this term in this field + * @property {object} metadata - A cloned collection of metadata associated with this document. + * @see {@link lunr.Index~Result} + */ +lunr.MatchData = function (term, field, metadata) { + var clonedMetadata = Object.create(null), + metadataKeys = Object.keys(metadata || {}) + + // Cloning the metadata to prevent the original + // being mutated during match data combination. + // Metadata is kept in an array within the inverted + // index so cloning the data can be done with + // Array#slice + for (var i = 0; i < metadataKeys.length; i++) { + var key = metadataKeys[i] + clonedMetadata[key] = metadata[key].slice() + } + + this.metadata = Object.create(null) + + if (term !== undefined) { + this.metadata[term] = Object.create(null) + this.metadata[term][field] = clonedMetadata + } +} + +/** + * An instance of lunr.MatchData will be created for every term that matches a + * document. However only one instance is required in a lunr.Index~Result. This + * method combines metadata from another instance of lunr.MatchData with this + * objects metadata. + * + * @param {lunr.MatchData} otherMatchData - Another instance of match data to merge with this one. + * @see {@link lunr.Index~Result} + */ +lunr.MatchData.prototype.combine = function (otherMatchData) { + var terms = Object.keys(otherMatchData.metadata) + + for (var i = 0; i < terms.length; i++) { + var term = terms[i], + fields = Object.keys(otherMatchData.metadata[term]) + + if (this.metadata[term] == undefined) { + this.metadata[term] = Object.create(null) + } + + for (var j = 0; j < fields.length; j++) { + var field = fields[j], + keys = Object.keys(otherMatchData.metadata[term][field]) + + if (this.metadata[term][field] == undefined) { + this.metadata[term][field] = Object.create(null) + } + + for (var k = 0; k < keys.length; k++) { + var key = keys[k] + + if (this.metadata[term][field][key] == undefined) { + this.metadata[term][field][key] = otherMatchData.metadata[term][field][key] + } else { + this.metadata[term][field][key] = this.metadata[term][field][key].concat(otherMatchData.metadata[term][field][key]) + } + + } + } + } +} + +/** + * Add metadata for a term/field pair to this instance of match data. + * + * @param {string} term - The term this match data is associated with + * @param {string} field - The field in which the term was found + * @param {object} metadata - The metadata recorded about this term in this field + */ +lunr.MatchData.prototype.add = function (term, field, metadata) { + if (!(term in this.metadata)) { + this.metadata[term] = Object.create(null) + this.metadata[term][field] = metadata + return + } + + if (!(field in this.metadata[term])) { + this.metadata[term][field] = metadata + return + } + + var metadataKeys = Object.keys(metadata) + + for (var i = 0; i < metadataKeys.length; i++) { + var key = metadataKeys[i] + + if (key in this.metadata[term][field]) { + this.metadata[term][field][key] = this.metadata[term][field][key].concat(metadata[key]) + } else { + this.metadata[term][field][key] = metadata[key] + } + } +} +/** + * A lunr.Query provides a programmatic way of defining queries to be performed + * against a {@link lunr.Index}. + * + * Prefer constructing a lunr.Query using the {@link lunr.Index#query} method + * so the query object is pre-initialized with the right index fields. + * + * @constructor + * @property {lunr.Query~Clause[]} clauses - An array of query clauses. + * @property {string[]} allFields - An array of all available fields in a lunr.Index. + */ +lunr.Query = function (allFields) { + this.clauses = [] + this.allFields = allFields +} + +/** + * Constants for indicating what kind of automatic wildcard insertion will be used when constructing a query clause. + * + * This allows wildcards to be added to the beginning and end of a term without having to manually do any string + * concatenation. + * + * The wildcard constants can be bitwise combined to select both leading and trailing wildcards. + * + * @constant + * @default + * @property {number} wildcard.NONE - The term will have no wildcards inserted, this is the default behaviour + * @property {number} wildcard.LEADING - Prepend the term with a wildcard, unless a leading wildcard already exists + * @property {number} wildcard.TRAILING - Append a wildcard to the term, unless a trailing wildcard already exists + * @see lunr.Query~Clause + * @see lunr.Query#clause + * @see lunr.Query#term + * @example query term with trailing wildcard + * query.term('foo', { wildcard: lunr.Query.wildcard.TRAILING }) + * @example query term with leading and trailing wildcard + * query.term('foo', { + * wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING + * }) + */ + +lunr.Query.wildcard = new String ("*") +lunr.Query.wildcard.NONE = 0 +lunr.Query.wildcard.LEADING = 1 +lunr.Query.wildcard.TRAILING = 2 + +/** + * Constants for indicating what kind of presence a term must have in matching documents. + * + * @constant + * @enum {number} + * @see lunr.Query~Clause + * @see lunr.Query#clause + * @see lunr.Query#term + * @example query term with required presence + * query.term('foo', { presence: lunr.Query.presence.REQUIRED }) + */ +lunr.Query.presence = { + /** + * Term's presence in a document is optional, this is the default value. + */ + OPTIONAL: 1, + + /** + * Term's presence in a document is required, documents that do not contain + * this term will not be returned. + */ + REQUIRED: 2, + + /** + * Term's presence in a document is prohibited, documents that do contain + * this term will not be returned. + */ + PROHIBITED: 3 +} + +/** + * A single clause in a {@link lunr.Query} contains a term and details on how to + * match that term against a {@link lunr.Index}. + * + * @typedef {Object} lunr.Query~Clause + * @property {string[]} fields - The fields in an index this clause should be matched against. + * @property {number} [boost=1] - Any boost that should be applied when matching this clause. + * @property {number} [editDistance] - Whether the term should have fuzzy matching applied, and how fuzzy the match should be. + * @property {boolean} [usePipeline] - Whether the term should be passed through the search pipeline. + * @property {number} [wildcard=lunr.Query.wildcard.NONE] - Whether the term should have wildcards appended or prepended. + * @property {number} [presence=lunr.Query.presence.OPTIONAL] - The terms presence in any matching documents. + */ + +/** + * Adds a {@link lunr.Query~Clause} to this query. + * + * Unless the clause contains the fields to be matched all fields will be matched. In addition + * a default boost of 1 is applied to the clause. + * + * @param {lunr.Query~Clause} clause - The clause to add to this query. + * @see lunr.Query~Clause + * @returns {lunr.Query} + */ +lunr.Query.prototype.clause = function (clause) { + if (!('fields' in clause)) { + clause.fields = this.allFields + } + + if (!('boost' in clause)) { + clause.boost = 1 + } + + if (!('usePipeline' in clause)) { + clause.usePipeline = true + } + + if (!('wildcard' in clause)) { + clause.wildcard = lunr.Query.wildcard.NONE + } + + if ((clause.wildcard & lunr.Query.wildcard.LEADING) && (clause.term.charAt(0) != lunr.Query.wildcard)) { + clause.term = "*" + clause.term + } + + if ((clause.wildcard & lunr.Query.wildcard.TRAILING) && (clause.term.slice(-1) != lunr.Query.wildcard)) { + clause.term = "" + clause.term + "*" + } + + if (!('presence' in clause)) { + clause.presence = lunr.Query.presence.OPTIONAL + } + + this.clauses.push(clause) + + return this +} + +/** + * A negated query is one in which every clause has a presence of + * prohibited. These queries require some special processing to return + * the expected results. + * + * @returns boolean + */ +lunr.Query.prototype.isNegated = function () { + for (var i = 0; i < this.clauses.length; i++) { + if (this.clauses[i].presence != lunr.Query.presence.PROHIBITED) { + return false + } + } + + return true +} + +/** + * Adds a term to the current query, under the covers this will create a {@link lunr.Query~Clause} + * to the list of clauses that make up this query. + * + * The term is used as is, i.e. no tokenization will be performed by this method. Instead conversion + * to a token or token-like string should be done before calling this method. + * + * The term will be converted to a string by calling `toString`. Multiple terms can be passed as an + * array, each term in the array will share the same options. + * + * @param {object|object[]} term - The term(s) to add to the query. + * @param {object} [options] - Any additional properties to add to the query clause. + * @returns {lunr.Query} + * @see lunr.Query#clause + * @see lunr.Query~Clause + * @example adding a single term to a query + * query.term("foo") + * @example adding a single term to a query and specifying search fields, term boost and automatic trailing wildcard + * query.term("foo", { + * fields: ["title"], + * boost: 10, + * wildcard: lunr.Query.wildcard.TRAILING + * }) + * @example using lunr.tokenizer to convert a string to tokens before using them as terms + * query.term(lunr.tokenizer("foo bar")) + */ +lunr.Query.prototype.term = function (term, options) { + if (Array.isArray(term)) { + term.forEach(function (t) { this.term(t, lunr.utils.clone(options)) }, this) + return this + } + + var clause = options || {} + clause.term = term.toString() + + this.clause(clause) + + return this +} +lunr.QueryParseError = function (message, start, end) { + this.name = "QueryParseError" + this.message = message + this.start = start + this.end = end +} + +lunr.QueryParseError.prototype = new Error +lunr.QueryLexer = function (str) { + this.lexemes = [] + this.str = str + this.length = str.length + this.pos = 0 + this.start = 0 + this.escapeCharPositions = [] +} + +lunr.QueryLexer.prototype.run = function () { + var state = lunr.QueryLexer.lexText + + while (state) { + state = state(this) + } +} + +lunr.QueryLexer.prototype.sliceString = function () { + var subSlices = [], + sliceStart = this.start, + sliceEnd = this.pos + + for (var i = 0; i < this.escapeCharPositions.length; i++) { + sliceEnd = this.escapeCharPositions[i] + subSlices.push(this.str.slice(sliceStart, sliceEnd)) + sliceStart = sliceEnd + 1 + } + + subSlices.push(this.str.slice(sliceStart, this.pos)) + this.escapeCharPositions.length = 0 + + return subSlices.join('') +} + +lunr.QueryLexer.prototype.emit = function (type) { + this.lexemes.push({ + type: type, + str: this.sliceString(), + start: this.start, + end: this.pos + }) + + this.start = this.pos +} + +lunr.QueryLexer.prototype.escapeCharacter = function () { + this.escapeCharPositions.push(this.pos - 1) + this.pos += 1 +} + +lunr.QueryLexer.prototype.next = function () { + if (this.pos >= this.length) { + return lunr.QueryLexer.EOS + } + + var char = this.str.charAt(this.pos) + this.pos += 1 + return char +} + +lunr.QueryLexer.prototype.width = function () { + return this.pos - this.start +} + +lunr.QueryLexer.prototype.ignore = function () { + if (this.start == this.pos) { + this.pos += 1 + } + + this.start = this.pos +} + +lunr.QueryLexer.prototype.backup = function () { + this.pos -= 1 +} + +lunr.QueryLexer.prototype.acceptDigitRun = function () { + var char, charCode + + do { + char = this.next() + charCode = char.charCodeAt(0) + } while (charCode > 47 && charCode < 58) + + if (char != lunr.QueryLexer.EOS) { + this.backup() + } +} + +lunr.QueryLexer.prototype.more = function () { + return this.pos < this.length +} + +lunr.QueryLexer.EOS = 'EOS' +lunr.QueryLexer.FIELD = 'FIELD' +lunr.QueryLexer.TERM = 'TERM' +lunr.QueryLexer.EDIT_DISTANCE = 'EDIT_DISTANCE' +lunr.QueryLexer.BOOST = 'BOOST' +lunr.QueryLexer.PRESENCE = 'PRESENCE' + +lunr.QueryLexer.lexField = function (lexer) { + lexer.backup() + lexer.emit(lunr.QueryLexer.FIELD) + lexer.ignore() + return lunr.QueryLexer.lexText +} + +lunr.QueryLexer.lexTerm = function (lexer) { + if (lexer.width() > 1) { + lexer.backup() + lexer.emit(lunr.QueryLexer.TERM) + } + + lexer.ignore() + + if (lexer.more()) { + return lunr.QueryLexer.lexText + } +} + +lunr.QueryLexer.lexEditDistance = function (lexer) { + lexer.ignore() + lexer.acceptDigitRun() + lexer.emit(lunr.QueryLexer.EDIT_DISTANCE) + return lunr.QueryLexer.lexText +} + +lunr.QueryLexer.lexBoost = function (lexer) { + lexer.ignore() + lexer.acceptDigitRun() + lexer.emit(lunr.QueryLexer.BOOST) + return lunr.QueryLexer.lexText +} + +lunr.QueryLexer.lexEOS = function (lexer) { + if (lexer.width() > 0) { + lexer.emit(lunr.QueryLexer.TERM) + } +} + +// This matches the separator used when tokenising fields +// within a document. These should match otherwise it is +// not possible to search for some tokens within a document. +// +// It is possible for the user to change the separator on the +// tokenizer so it _might_ clash with any other of the special +// characters already used within the search string, e.g. :. +// +// This means that it is possible to change the separator in +// such a way that makes some words unsearchable using a search +// string. +lunr.QueryLexer.termSeparator = lunr.tokenizer.separator + +lunr.QueryLexer.lexText = function (lexer) { + while (true) { + var char = lexer.next() + + if (char == lunr.QueryLexer.EOS) { + return lunr.QueryLexer.lexEOS + } + + // Escape character is '\' + if (char.charCodeAt(0) == 92) { + lexer.escapeCharacter() + continue + } + + if (char == ":") { + return lunr.QueryLexer.lexField + } + + if (char == "~") { + lexer.backup() + if (lexer.width() > 0) { + lexer.emit(lunr.QueryLexer.TERM) + } + return lunr.QueryLexer.lexEditDistance + } + + if (char == "^") { + lexer.backup() + if (lexer.width() > 0) { + lexer.emit(lunr.QueryLexer.TERM) + } + return lunr.QueryLexer.lexBoost + } + + // "+" indicates term presence is required + // checking for length to ensure that only + // leading "+" are considered + if (char == "+" && lexer.width() === 1) { + lexer.emit(lunr.QueryLexer.PRESENCE) + return lunr.QueryLexer.lexText + } + + // "-" indicates term presence is prohibited + // checking for length to ensure that only + // leading "-" are considered + if (char == "-" && lexer.width() === 1) { + lexer.emit(lunr.QueryLexer.PRESENCE) + return lunr.QueryLexer.lexText + } + + if (char.match(lunr.QueryLexer.termSeparator)) { + return lunr.QueryLexer.lexTerm + } + } +} + +lunr.QueryParser = function (str, query) { + this.lexer = new lunr.QueryLexer (str) + this.query = query + this.currentClause = {} + this.lexemeIdx = 0 +} + +lunr.QueryParser.prototype.parse = function () { + this.lexer.run() + this.lexemes = this.lexer.lexemes + + var state = lunr.QueryParser.parseClause + + while (state) { + state = state(this) + } + + return this.query +} + +lunr.QueryParser.prototype.peekLexeme = function () { + return this.lexemes[this.lexemeIdx] +} + +lunr.QueryParser.prototype.consumeLexeme = function () { + var lexeme = this.peekLexeme() + this.lexemeIdx += 1 + return lexeme +} + +lunr.QueryParser.prototype.nextClause = function () { + var completedClause = this.currentClause + this.query.clause(completedClause) + this.currentClause = {} +} + +lunr.QueryParser.parseClause = function (parser) { + var lexeme = parser.peekLexeme() + + if (lexeme == undefined) { + return + } + + switch (lexeme.type) { + case lunr.QueryLexer.PRESENCE: + return lunr.QueryParser.parsePresence + case lunr.QueryLexer.FIELD: + return lunr.QueryParser.parseField + case lunr.QueryLexer.TERM: + return lunr.QueryParser.parseTerm + default: + var errorMessage = "expected either a field or a term, found " + lexeme.type + + if (lexeme.str.length >= 1) { + errorMessage += " with value '" + lexeme.str + "'" + } + + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } +} + +lunr.QueryParser.parsePresence = function (parser) { + var lexeme = parser.consumeLexeme() + + if (lexeme == undefined) { + return + } + + switch (lexeme.str) { + case "-": + parser.currentClause.presence = lunr.Query.presence.PROHIBITED + break + case "+": + parser.currentClause.presence = lunr.Query.presence.REQUIRED + break + default: + var errorMessage = "unrecognised presence operator'" + lexeme.str + "'" + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + var nextLexeme = parser.peekLexeme() + + if (nextLexeme == undefined) { + var errorMessage = "expecting term or field, found nothing" + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + switch (nextLexeme.type) { + case lunr.QueryLexer.FIELD: + return lunr.QueryParser.parseField + case lunr.QueryLexer.TERM: + return lunr.QueryParser.parseTerm + default: + var errorMessage = "expecting term or field, found '" + nextLexeme.type + "'" + throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end) + } +} + +lunr.QueryParser.parseField = function (parser) { + var lexeme = parser.consumeLexeme() + + if (lexeme == undefined) { + return + } + + if (parser.query.allFields.indexOf(lexeme.str) == -1) { + var possibleFields = parser.query.allFields.map(function (f) { return "'" + f + "'" }).join(', '), + errorMessage = "unrecognised field '" + lexeme.str + "', possible fields: " + possibleFields + + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + parser.currentClause.fields = [lexeme.str] + + var nextLexeme = parser.peekLexeme() + + if (nextLexeme == undefined) { + var errorMessage = "expecting term, found nothing" + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + switch (nextLexeme.type) { + case lunr.QueryLexer.TERM: + return lunr.QueryParser.parseTerm + default: + var errorMessage = "expecting term, found '" + nextLexeme.type + "'" + throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end) + } +} + +lunr.QueryParser.parseTerm = function (parser) { + var lexeme = parser.consumeLexeme() + + if (lexeme == undefined) { + return + } + + parser.currentClause.term = lexeme.str.toLowerCase() + + if (lexeme.str.indexOf("*") != -1) { + parser.currentClause.usePipeline = false + } + + var nextLexeme = parser.peekLexeme() + + if (nextLexeme == undefined) { + parser.nextClause() + return + } + + switch (nextLexeme.type) { + case lunr.QueryLexer.TERM: + parser.nextClause() + return lunr.QueryParser.parseTerm + case lunr.QueryLexer.FIELD: + parser.nextClause() + return lunr.QueryParser.parseField + case lunr.QueryLexer.EDIT_DISTANCE: + return lunr.QueryParser.parseEditDistance + case lunr.QueryLexer.BOOST: + return lunr.QueryParser.parseBoost + case lunr.QueryLexer.PRESENCE: + parser.nextClause() + return lunr.QueryParser.parsePresence + default: + var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'" + throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end) + } +} + +lunr.QueryParser.parseEditDistance = function (parser) { + var lexeme = parser.consumeLexeme() + + if (lexeme == undefined) { + return + } + + var editDistance = parseInt(lexeme.str, 10) + + if (isNaN(editDistance)) { + var errorMessage = "edit distance must be numeric" + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + parser.currentClause.editDistance = editDistance + + var nextLexeme = parser.peekLexeme() + + if (nextLexeme == undefined) { + parser.nextClause() + return + } + + switch (nextLexeme.type) { + case lunr.QueryLexer.TERM: + parser.nextClause() + return lunr.QueryParser.parseTerm + case lunr.QueryLexer.FIELD: + parser.nextClause() + return lunr.QueryParser.parseField + case lunr.QueryLexer.EDIT_DISTANCE: + return lunr.QueryParser.parseEditDistance + case lunr.QueryLexer.BOOST: + return lunr.QueryParser.parseBoost + case lunr.QueryLexer.PRESENCE: + parser.nextClause() + return lunr.QueryParser.parsePresence + default: + var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'" + throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end) + } +} + +lunr.QueryParser.parseBoost = function (parser) { + var lexeme = parser.consumeLexeme() + + if (lexeme == undefined) { + return + } + + var boost = parseInt(lexeme.str, 10) + + if (isNaN(boost)) { + var errorMessage = "boost must be numeric" + throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end) + } + + parser.currentClause.boost = boost + + var nextLexeme = parser.peekLexeme() + + if (nextLexeme == undefined) { + parser.nextClause() + return + } + + switch (nextLexeme.type) { + case lunr.QueryLexer.TERM: + parser.nextClause() + return lunr.QueryParser.parseTerm + case lunr.QueryLexer.FIELD: + parser.nextClause() + return lunr.QueryParser.parseField + case lunr.QueryLexer.EDIT_DISTANCE: + return lunr.QueryParser.parseEditDistance + case lunr.QueryLexer.BOOST: + return lunr.QueryParser.parseBoost + case lunr.QueryLexer.PRESENCE: + parser.nextClause() + return lunr.QueryParser.parsePresence + default: + var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'" + throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end) + } +} + + /** + * export the module via AMD, CommonJS or as a browser global + * Export code from https://github.com/umdjs/umd/blob/master/returnExports.js + */ + ;(function (root, factory) { + if (typeof define === 'function' && define.amd) { + // AMD. Register as an anonymous module. + define(factory) + } else if (typeof exports === 'object') { + /** + * Node. Does not work with strict CommonJS, but + * only CommonJS-like environments that support module.exports, + * like Node. + */ + module.exports = factory() + } else { + // Browser globals (root is window) + root.lunr = factory() + } + }(this, function () { + /** + * Just return a value to define the module export. + * This example returns an object, but the module + * can return a function as the exported value. + */ + return lunr + })) +})(); diff --git a/docs/search/main.js b/docs/search/main.js new file mode 100644 index 0000000..a5e469d --- /dev/null +++ b/docs/search/main.js @@ -0,0 +1,109 @@ +function getSearchTermFromLocation() { + var sPageURL = window.location.search.substring(1); + var sURLVariables = sPageURL.split('&'); + for (var i = 0; i < sURLVariables.length; i++) { + var sParameterName = sURLVariables[i].split('='); + if (sParameterName[0] == 'q') { + return decodeURIComponent(sParameterName[1].replace(/\+/g, '%20')); + } + } +} + +function joinUrl (base, path) { + if (path.substring(0, 1) === "/") { + // path starts with `/`. Thus it is absolute. + return path; + } + if (base.substring(base.length-1) === "/") { + // base ends with `/` + return base + path; + } + return base + "/" + path; +} + +function escapeHtml (value) { + return value.replace(/&/g, '&') + .replace(/"/g, '"') + .replace(//g, '>'); +} + +function formatResult (location, title, summary) { + return ''; +} + +function displayResults (results) { + var search_results = document.getElementById("mkdocs-search-results"); + while (search_results.firstChild) { + search_results.removeChild(search_results.firstChild); + } + if (results.length > 0){ + for (var i=0; i < results.length; i++){ + var result = results[i]; + var html = formatResult(result.location, result.title, result.summary); + search_results.insertAdjacentHTML('beforeend', html); + } + } else { + var noResultsText = search_results.getAttribute('data-no-results-text'); + if (!noResultsText) { + noResultsText = "No results found"; + } + search_results.insertAdjacentHTML('beforeend', '

' + noResultsText + '

'); + } +} + +function doSearch () { + var query = document.getElementById('mkdocs-search-query').value; + if (query.length > min_search_length) { + if (!window.Worker) { + displayResults(search(query)); + } else { + searchWorker.postMessage({query: query}); + } + } else { + // Clear results for short queries + displayResults([]); + } +} + +function initSearch () { + var search_input = document.getElementById('mkdocs-search-query'); + if (search_input) { + search_input.addEventListener("keyup", doSearch); + } + var term = getSearchTermFromLocation(); + if (term) { + search_input.value = term; + doSearch(); + } +} + +function onWorkerMessage (e) { + if (e.data.allowSearch) { + initSearch(); + } else if (e.data.results) { + var results = e.data.results; + displayResults(results); + } else if (e.data.config) { + min_search_length = e.data.config.min_search_length-1; + } +} + +if (!window.Worker) { + console.log('Web Worker API not supported'); + // load index in main thread + $.getScript(joinUrl(base_url, "search/worker.js")).done(function () { + console.log('Loaded worker'); + init(); + window.postMessage = function (msg) { + onWorkerMessage({data: msg}); + }; + }).fail(function (jqxhr, settings, exception) { + console.error('Could not load worker.js'); + }); +} else { + // Wrap search in a web worker + var searchWorker = new Worker(joinUrl(base_url, "search/worker.js")); + searchWorker.postMessage({init: true}); + searchWorker.onmessage = onWorkerMessage; +} diff --git a/docs/search/search_index.json b/docs/search/search_index.json new file mode 100644 index 0000000..5d0e377 --- /dev/null +++ b/docs/search/search_index.json @@ -0,0 +1 @@ +{"config":{"indexing":"full","lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"context-async-sqlalchemy SOURCE CODE Provides a super convenient way to work with sqlalchemy in asynchronous applications. It takes care of the issues of managing the lifecycle of engine, session, and transactions without being a wrapper. The main task is to get quick and easy access to the session and not worry about when to open and when to close it. The key features are: Super easy to use Automatically manages the lifecycle of engine, session, and transaction (autocommit/autorollback) It doesn't interfere with manually opening and closing sessions and transactions when needed. Does not depend on the web framework It is not a wrapper over sqlalchemy It is convenient to test Host switching in runtime It can manage multiple databases and multiple sessions to a single database Provides tools for concurrent sql queries What does usage look like? from context_async_sqlalchemy import db_session from sqlalchemy import insert from database import connection # your configured connection to the database from models import ExampleTable # just some model for example async def some_func() -> None: # Created a session (no connection to the database yet) session = await db_session(connection) stmt = insert(ExampleTable).values(text=\"example_with_db_session\") # On the first request, a connection and transaction were opened await session.execute(stmt) # If you call db_session again, it will return the same session # even in child coroutines. session = await db_session(connection) # The second request will use the same connection and the same transaction await session.execute(stmt) # The commit and closing of the session will occur automatically How it works Here is a very simplified diagram of how everything works: Before executing your code, the middleware will prepare a container in which the sessions required by your code will be stored. The container is saved in contextvars Your code accesses the library to create new sessions and retrieve existing ones After your code, middleware will automatically commit or roll back open transactions. Closes open sessions and clears the context. The library also provides the ability to commit, rollback, and close at any time, without waiting for the end of the request, without any problems.","title":"context-async-sqlalchemy"},{"location":"#context-async-sqlalchemy","text":"SOURCE CODE Provides a super convenient way to work with sqlalchemy in asynchronous applications. It takes care of the issues of managing the lifecycle of engine, session, and transactions without being a wrapper. The main task is to get quick and easy access to the session and not worry about when to open and when to close it. The key features are: Super easy to use Automatically manages the lifecycle of engine, session, and transaction (autocommit/autorollback) It doesn't interfere with manually opening and closing sessions and transactions when needed. Does not depend on the web framework It is not a wrapper over sqlalchemy It is convenient to test Host switching in runtime It can manage multiple databases and multiple sessions to a single database Provides tools for concurrent sql queries","title":"context-async-sqlalchemy"},{"location":"#what-does-usage-look-like","text":"from context_async_sqlalchemy import db_session from sqlalchemy import insert from database import connection # your configured connection to the database from models import ExampleTable # just some model for example async def some_func() -> None: # Created a session (no connection to the database yet) session = await db_session(connection) stmt = insert(ExampleTable).values(text=\"example_with_db_session\") # On the first request, a connection and transaction were opened await session.execute(stmt) # If you call db_session again, it will return the same session # even in child coroutines. session = await db_session(connection) # The second request will use the same connection and the same transaction await session.execute(stmt) # The commit and closing of the session will occur automatically","title":"What does usage look like?"},{"location":"#how-it-works","text":"Here is a very simplified diagram of how everything works: Before executing your code, the middleware will prepare a container in which the sessions required by your code will be stored. The container is saved in contextvars Your code accesses the library to create new sessions and retrieve existing ones After your code, middleware will automatically commit or roll back open transactions. Closes open sessions and clears the context. The library also provides the ability to commit, rollback, and close at any time, without waiting for the end of the request, without any problems.","title":"How it works"},{"location":"getting_started/","text":"from starlette.applications import Starlette Getting started Configure the connection to the database for example for PostgreSQL database.py: from sqlalchemy.ext.asyncio import ( async_sessionmaker, AsyncEngine, AsyncSession, create_async_engine, ) from context_async_sqlalchemy import DBConnect def create_engine(host: str) -> AsyncEngine: \"\"\" database connection parameters. \"\"\" # In production code, you will probably take these parameters from env pg_user = \"krylosov-aa\" pg_password = \"\" pg_port = 6432 pg_db = \"test\" return create_async_engine( f\"postgresql+asyncpg://\" f\"{pg_user}:{pg_password}\" f\"@{host}:{pg_port}\" f\"/{pg_db}\", future=True, pool_pre_ping=True, ) def create_session_maker( engine: AsyncEngine, ) -> async_sessionmaker[AsyncSession]: \"\"\"session parameters\"\"\" return async_sessionmaker( engine, class_=AsyncSession, expire_on_commit=False ) connection = DBConnect( host=\"127.0.0.1\", engine_creator=create_engine, session_maker_creator=create_session_maker, ) Manage Database connection lifecycle Close the resources at the end of your application's life Example for FastAPI: from contextlib import asynccontextmanager from typing import Any, AsyncGenerator from fastapi import FastAPI from database import connection @asynccontextmanager async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]: \"\"\"Database connection lifecycle management\"\"\" yield await connection.close() # Close the engine if it was open Setup middleware Middleware takes on the most important and complex work of managing context and sessions. You can use ready-made middlewares: FastAPI from context_async_sqlalchemy.fastapi_utils import ( add_fastapi_http_db_session_middleware, ) app = FastAPI(...) add_fastapi_http_db_session_middleware(app) Starlette from context_async_sqlalchemy.starlette_utils import ( add_starlette_http_db_session_middleware, ) app = Starlette(...) add_starlette_http_db_session_middleware(app) Write own If there is no ready-made solution for you, don't worry! You can see how it works and write your own. Use it from context_async_sqlalchemy import db_session from sqlalchemy import insert from database import connection # your configured connection to the database from models import ExampleTable # just some model for example async def some_func() -> None: # Created a session (no connection to the database yet) session = await db_session(connection) stmt = insert(ExampleTable).values(text=\"example_with_db_session\") # On the first request, a connection and transaction were opened await session.execute(stmt) # If you call db_session again, it will return the same session # even in child coroutines. session = await db_session(connection) # The second request will use the same connection and the same transaction await session.execute(stmt) # The commit and closing of the session will occur automatically Examples The repository includes an example integration with FastAPI, which describes numerous workflows. FastAPI example It also includes two types of test setups you can use in your projects. All library tests are in the examples, as we want to test not in the abstract but in the context of a real asynchronous web application. FastAPI tests example","title":"Getting started"},{"location":"getting_started/#getting-started","text":"","title":"Getting started"},{"location":"getting_started/#configure-the-connection-to-the-database","text":"for example for PostgreSQL database.py: from sqlalchemy.ext.asyncio import ( async_sessionmaker, AsyncEngine, AsyncSession, create_async_engine, ) from context_async_sqlalchemy import DBConnect def create_engine(host: str) -> AsyncEngine: \"\"\" database connection parameters. \"\"\" # In production code, you will probably take these parameters from env pg_user = \"krylosov-aa\" pg_password = \"\" pg_port = 6432 pg_db = \"test\" return create_async_engine( f\"postgresql+asyncpg://\" f\"{pg_user}:{pg_password}\" f\"@{host}:{pg_port}\" f\"/{pg_db}\", future=True, pool_pre_ping=True, ) def create_session_maker( engine: AsyncEngine, ) -> async_sessionmaker[AsyncSession]: \"\"\"session parameters\"\"\" return async_sessionmaker( engine, class_=AsyncSession, expire_on_commit=False ) connection = DBConnect( host=\"127.0.0.1\", engine_creator=create_engine, session_maker_creator=create_session_maker, )","title":"Configure the connection to the database"},{"location":"getting_started/#manage-database-connection-lifecycle","text":"Close the resources at the end of your application's life Example for FastAPI: from contextlib import asynccontextmanager from typing import Any, AsyncGenerator from fastapi import FastAPI from database import connection @asynccontextmanager async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]: \"\"\"Database connection lifecycle management\"\"\" yield await connection.close() # Close the engine if it was open","title":"Manage Database connection lifecycle"},{"location":"getting_started/#setup-middleware","text":"Middleware takes on the most important and complex work of managing context and sessions. You can use ready-made middlewares:","title":"Setup middleware"},{"location":"getting_started/#fastapi","text":"from context_async_sqlalchemy.fastapi_utils import ( add_fastapi_http_db_session_middleware, ) app = FastAPI(...) add_fastapi_http_db_session_middleware(app)","title":"FastAPI"},{"location":"getting_started/#starlette","text":"from context_async_sqlalchemy.starlette_utils import ( add_starlette_http_db_session_middleware, ) app = Starlette(...) add_starlette_http_db_session_middleware(app)","title":"Starlette"},{"location":"getting_started/#write-own","text":"If there is no ready-made solution for you, don't worry! You can see how it works and write your own.","title":"Write own"},{"location":"getting_started/#use-it","text":"from context_async_sqlalchemy import db_session from sqlalchemy import insert from database import connection # your configured connection to the database from models import ExampleTable # just some model for example async def some_func() -> None: # Created a session (no connection to the database yet) session = await db_session(connection) stmt = insert(ExampleTable).values(text=\"example_with_db_session\") # On the first request, a connection and transaction were opened await session.execute(stmt) # If you call db_session again, it will return the same session # even in child coroutines. session = await db_session(connection) # The second request will use the same connection and the same transaction await session.execute(stmt) # The commit and closing of the session will occur automatically","title":"Use it"},{"location":"getting_started/#examples","text":"The repository includes an example integration with FastAPI, which describes numerous workflows. FastAPI example It also includes two types of test setups you can use in your projects. All library tests are in the examples, as we want to test not in the abstract but in the context of a real asynchronous web application. FastAPI tests example","title":"Examples"},{"location":"how_middleware_works/","text":"How middleware works The biggest part of the work and magic happens in middleware. The library strives to provide ready-made solutions so that you don't have to worry. But they are not always there. Therefore, we will tell you how starlette middleware works, using the example of which you can write your own. from starlette.middleware.base import ( # type: ignore[attr-defined] Request, Response, RequestResponseEndpoint, BaseHTTPMiddleware, ) from context_async_sqlalchemy import ( init_db_session_ctx, is_context_initiated, reset_db_session_ctx, auto_commit_by_status_code, rollback_all_sessions, ) async def starlette_http_db_session_middleware( request: Request, call_next: RequestResponseEndpoint ) -> Response: \"\"\" Database session lifecycle management. The session itself is created on demand in db_session(). Transaction auto-commit is implemented if there is no exception and the response status is < 400. Otherwise, a rollback is performed. But you can commit or rollback manually in the handler. \"\"\" # Tests have different session management rules # so if the context variable is already set, we do nothing if is_context_initiated(): return await call_next(request) # We set the context here, meaning all child coroutines will receive the # same context. And even if a child coroutine requests the # session first, the container itself is shared, and this coroutine will # add the session to container = shared context. token = init_db_session_ctx() try: response = await call_next(request) # using the status code, we decide to commit or rollback all sessions await auto_commit_by_status_code(response.status_code) return response except Exception: # If an exception occurs, we roll all sessions back await rollback_all_sessions() raise finally: # Close all sessions and clear the context await reset_db_session_ctx(token)","title":"How middleware works"},{"location":"how_middleware_works/#how-middleware-works","text":"The biggest part of the work and magic happens in middleware. The library strives to provide ready-made solutions so that you don't have to worry. But they are not always there. Therefore, we will tell you how starlette middleware works, using the example of which you can write your own. from starlette.middleware.base import ( # type: ignore[attr-defined] Request, Response, RequestResponseEndpoint, BaseHTTPMiddleware, ) from context_async_sqlalchemy import ( init_db_session_ctx, is_context_initiated, reset_db_session_ctx, auto_commit_by_status_code, rollback_all_sessions, ) async def starlette_http_db_session_middleware( request: Request, call_next: RequestResponseEndpoint ) -> Response: \"\"\" Database session lifecycle management. The session itself is created on demand in db_session(). Transaction auto-commit is implemented if there is no exception and the response status is < 400. Otherwise, a rollback is performed. But you can commit or rollback manually in the handler. \"\"\" # Tests have different session management rules # so if the context variable is already set, we do nothing if is_context_initiated(): return await call_next(request) # We set the context here, meaning all child coroutines will receive the # same context. And even if a child coroutine requests the # session first, the container itself is shared, and this coroutine will # add the session to container = shared context. token = init_db_session_ctx() try: response = await call_next(request) # using the status code, we decide to commit or rollback all sessions await auto_commit_by_status_code(response.status_code) return response except Exception: # If an exception occurs, we roll all sessions back await rollback_all_sessions() raise finally: # Close all sessions and clear the context await reset_db_session_ctx(token)","title":"How middleware works"},{"location":"master_replica/","text":"Master/Replica or several databases at the same time This is why db_session and other functions accept DBConnect as input. This way, you can work with multiple hosts simultaneously, for example, with the master and the replica. DBConnect also accepts factories instead of ready-made objects, so that you can easily change the host at the right time. For example, libpq can detect the master and replica to create an engine. However, it only does this once during creation. before_create_session_handler helps change the host in the runtime if the master or replica changes. You need a third-party functionality that helps determine the master or replica. I hope I can give you a ready solution soon too . The engine will not be created immediately when DBConnect is initialized. This will only happen on the first request. The library is lazy in many places. from context_async_sqlalchemy import DBConnect from master_replica_helper import get_master, get_replica async def renew_master_connect(connect: DBConnect) -> None: \"\"\"Updates the host if the master has changed\"\"\" master_host = await get_master() if master_host != connect.host: await connect.change_host(master_host) master = DBConnect( ..., before_create_session_handler=renew_master_connect, ) async def renew_replica_connect(connect: DBConnect) -> None: \"\"\"Updates the host if the replica has changed\"\"\" replica_host = await get_replica() if replica_host != connect.host: await connect.change_host(replica_host) replica = DBConnect( ..., before_create_session_handler=renew_replica_connect, )","title":"Master/Replica or several databases at the same time"},{"location":"master_replica/#masterreplica-or-several-databases-at-the-same-time","text":"This is why db_session and other functions accept DBConnect as input. This way, you can work with multiple hosts simultaneously, for example, with the master and the replica. DBConnect also accepts factories instead of ready-made objects, so that you can easily change the host at the right time. For example, libpq can detect the master and replica to create an engine. However, it only does this once during creation. before_create_session_handler helps change the host in the runtime if the master or replica changes. You need a third-party functionality that helps determine the master or replica. I hope I can give you a ready solution soon too . The engine will not be created immediately when DBConnect is initialized. This will only happen on the first request. The library is lazy in many places. from context_async_sqlalchemy import DBConnect from master_replica_helper import get_master, get_replica async def renew_master_connect(connect: DBConnect) -> None: \"\"\"Updates the host if the master has changed\"\"\" master_host = await get_master() if master_host != connect.host: await connect.change_host(master_host) master = DBConnect( ..., before_create_session_handler=renew_master_connect, ) async def renew_replica_connect(connect: DBConnect) -> None: \"\"\"Updates the host if the replica has changed\"\"\" replica_host = await get_replica() if replica_host != connect.host: await connect.change_host(replica_host) replica = DBConnect( ..., before_create_session_handler=renew_replica_connect, )","title":"Master/Replica or several databases at the same time"},{"location":"testing/","text":"Testing The library provides several ready-made utils that can be used in tests, for example in fixtures. It helps write tests that share a common transaction between the test and the application, so data isolation between tests is achieved through fast transaction rollback. You can see the capabilities in the examples: Here are tests with a common transaction between the application and the tests. And here's an example with different transactions.","title":"Testing"},{"location":"testing/#testing","text":"The library provides several ready-made utils that can be used in tests, for example in fixtures. It helps write tests that share a common transaction between the test and the application, so data isolation between tests is achieved through fast transaction rollback. You can see the capabilities in the examples: Here are tests with a common transaction between the application and the tests. And here's an example with different transactions.","title":"Testing"}]} \ No newline at end of file diff --git a/docs/search/worker.js b/docs/search/worker.js new file mode 100644 index 0000000..8628dbc --- /dev/null +++ b/docs/search/worker.js @@ -0,0 +1,133 @@ +var base_path = 'function' === typeof importScripts ? '.' : '/search/'; +var allowSearch = false; +var index; +var documents = {}; +var lang = ['en']; +var data; + +function getScript(script, callback) { + console.log('Loading script: ' + script); + $.getScript(base_path + script).done(function () { + callback(); + }).fail(function (jqxhr, settings, exception) { + console.log('Error: ' + exception); + }); +} + +function getScriptsInOrder(scripts, callback) { + if (scripts.length === 0) { + callback(); + return; + } + getScript(scripts[0], function() { + getScriptsInOrder(scripts.slice(1), callback); + }); +} + +function loadScripts(urls, callback) { + if( 'function' === typeof importScripts ) { + importScripts.apply(null, urls); + callback(); + } else { + getScriptsInOrder(urls, callback); + } +} + +function onJSONLoaded () { + data = JSON.parse(this.responseText); + var scriptsToLoad = ['lunr.js']; + if (data.config && data.config.lang && data.config.lang.length) { + lang = data.config.lang; + } + if (lang.length > 1 || lang[0] !== "en") { + scriptsToLoad.push('lunr.stemmer.support.js'); + if (lang.length > 1) { + scriptsToLoad.push('lunr.multi.js'); + } + if (lang.includes("ja") || lang.includes("jp")) { + scriptsToLoad.push('tinyseg.js'); + } + for (var i=0; i < lang.length; i++) { + if (lang[i] != 'en') { + scriptsToLoad.push(['lunr', lang[i], 'js'].join('.')); + } + } + } + loadScripts(scriptsToLoad, onScriptsLoaded); +} + +function onScriptsLoaded () { + console.log('All search scripts loaded, building Lunr index...'); + if (data.config && data.config.separator && data.config.separator.length) { + lunr.tokenizer.separator = new RegExp(data.config.separator); + } + + if (data.index) { + index = lunr.Index.load(data.index); + data.docs.forEach(function (doc) { + documents[doc.location] = doc; + }); + console.log('Lunr pre-built index loaded, search ready'); + } else { + index = lunr(function () { + if (lang.length === 1 && lang[0] !== "en" && lunr[lang[0]]) { + this.use(lunr[lang[0]]); + } else if (lang.length > 1) { + this.use(lunr.multiLanguage.apply(null, lang)); // spread operator not supported in all browsers: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator#Browser_compatibility + } + this.field('title'); + this.field('text'); + this.ref('location'); + + for (var i=0; i < data.docs.length; i++) { + var doc = data.docs[i]; + this.add(doc); + documents[doc.location] = doc; + } + }); + console.log('Lunr index built, search ready'); + } + allowSearch = true; + postMessage({config: data.config}); + postMessage({allowSearch: allowSearch}); +} + +function init () { + var oReq = new XMLHttpRequest(); + oReq.addEventListener("load", onJSONLoaded); + var index_path = base_path + '/search_index.json'; + if( 'function' === typeof importScripts ){ + index_path = 'search_index.json'; + } + oReq.open("GET", index_path); + oReq.send(); +} + +function search (query) { + if (!allowSearch) { + console.error('Assets for search still loading'); + return; + } + + var resultDocuments = []; + var results = index.search(query); + for (var i=0; i < results.length; i++){ + var result = results[i]; + doc = documents[result.ref]; + doc.summary = doc.text.substring(0, 200); + resultDocuments.push(doc); + } + return resultDocuments; +} + +if( 'function' === typeof importScripts ) { + onmessage = function (e) { + if (e.data.init) { + init(); + } else if (e.data.query) { + postMessage({ results: search(e.data.query) }); + } else { + console.error("Worker - Unrecognized message: " + e); + } + }; +} diff --git a/docs/sitemap.xml b/docs/sitemap.xml new file mode 100644 index 0000000..0f8724e --- /dev/null +++ b/docs/sitemap.xml @@ -0,0 +1,3 @@ + + + \ No newline at end of file diff --git a/docs/sitemap.xml.gz b/docs/sitemap.xml.gz new file mode 100644 index 0000000..6592911 Binary files /dev/null and b/docs/sitemap.xml.gz differ diff --git a/docs/testing/index.html b/docs/testing/index.html new file mode 100644 index 0000000..8873143 --- /dev/null +++ b/docs/testing/index.html @@ -0,0 +1,148 @@ + + + + + + + + Testing - context-async-sqlalchemy + + + + + + + + + + + + + +
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+ +

Testing

+

The library provides several ready-made utils that can be used in tests, +for example in fixtures. It helps write tests that share a common transaction +between the test and the application, so data isolation between tests is +achieved through fast transaction rollback.

+

You can see the capabilities in the examples:

+

Here are tests with a common transaction between the +application and the tests.

+

And here's an example with different transactions.

+ +
+
+ +
+
+ +
+ +
+ +
+ + + + GitHub + + + + « Previous + + + Next » + + +
+ + + + + + + + + diff --git a/docs_sources/docs/getting_started.md b/docs_sources/docs/getting_started.md new file mode 100644 index 0000000..b491472 --- /dev/null +++ b/docs_sources/docs/getting_started.md @@ -0,0 +1,154 @@ +from starlette.applications import Starlette + +# Getting started + +## Configure the connection to the database + +for example for PostgreSQL database.py: + +```python +from sqlalchemy.ext.asyncio import ( + async_sessionmaker, + AsyncEngine, + AsyncSession, + create_async_engine, +) + +from context_async_sqlalchemy import DBConnect + + +def create_engine(host: str) -> AsyncEngine: + """ + database connection parameters. + """ + + # In production code, you will probably take these parameters from env + pg_user = "krylosov-aa" + pg_password = "" + pg_port = 6432 + pg_db = "test" + return create_async_engine( + f"postgresql+asyncpg://" + f"{pg_user}:{pg_password}" + f"@{host}:{pg_port}" + f"/{pg_db}", + future=True, + pool_pre_ping=True, + ) + + +def create_session_maker( + engine: AsyncEngine, +) -> async_sessionmaker[AsyncSession]: + """session parameters""" + return async_sessionmaker( + engine, class_=AsyncSession, expire_on_commit=False + ) + + +connection = DBConnect( + host="127.0.0.1", + engine_creator=create_engine, + session_maker_creator=create_session_maker, +) +``` + + +## Manage Database connection lifecycle + + +Close the resources at the end of your application's life + +Example for FastAPI: + +```python +from contextlib import asynccontextmanager +from typing import Any, AsyncGenerator +from fastapi import FastAPI + +from database import connection + + +@asynccontextmanager +async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]: + """Database connection lifecycle management""" + yield + await connection.close() # Close the engine if it was open +``` + +## Setup middleware + +Middleware takes on the most important and complex work of managing context and sessions. + + +You can use ready-made middlewares: + +### FastAPI + +```python +from context_async_sqlalchemy.fastapi_utils import ( + add_fastapi_http_db_session_middleware, +) + +app = FastAPI(...) +add_fastapi_http_db_session_middleware(app) +``` + +### Starlette + +```python +from context_async_sqlalchemy.starlette_utils import ( + add_starlette_http_db_session_middleware, +) + +app = Starlette(...) +add_starlette_http_db_session_middleware(app) +``` + +### Write own + +If there is no ready-made solution for you, don't worry! You can see +[how it works](how_middleware_works.md) and write your own. + + +## Use it + +```python +from context_async_sqlalchemy import db_session +from sqlalchemy import insert + +from database import connection # your configured connection to the database +from models import ExampleTable # just some model for example + +async def some_func() -> None: + # Created a session (no connection to the database yet) + session = await db_session(connection) + + stmt = insert(ExampleTable).values(text="example_with_db_session") + + # On the first request, a connection and transaction were opened + await session.execute(stmt) + + # If you call db_session again, it will return the same session + # even in child coroutines. + session = await db_session(connection) + + # The second request will use the same connection and the same transaction + await session.execute(stmt) + + # The commit and closing of the session will occur automatically +``` + + +## Examples + +The repository includes an example integration with FastAPI, +which describes numerous workflows. +[FastAPI example](https://github.com/krylosov-aa/context-async-sqlalchemy/tree/main/examples/fastapi_example/routes) + +It also includes two types of test setups you can use in your projects. + +All library tests are in the examples, as we want to test not in the abstract +but in the context of a real asynchronous web application. + +[FastAPI tests example](https://github.com/krylosov-aa/context-async-sqlalchemy/tree/main/examples/fastapi_example/tests) diff --git a/docs_sources/docs/how_middleware_works.md b/docs_sources/docs/how_middleware_works.md new file mode 100644 index 0000000..f2e8a12 --- /dev/null +++ b/docs_sources/docs/how_middleware_works.md @@ -0,0 +1,60 @@ +# How middleware works + +The biggest part of the work and magic happens in middleware. +The library strives to provide ready-made solutions so that you don't have to +worry. But they are not always there. +Therefore, we will tell you how starlette middleware works, +using the example of which you can write your own. + + +```python +from starlette.middleware.base import ( # type: ignore[attr-defined] + Request, + Response, + RequestResponseEndpoint, + BaseHTTPMiddleware, +) + +from context_async_sqlalchemy import ( + init_db_session_ctx, + is_context_initiated, + reset_db_session_ctx, + auto_commit_by_status_code, + rollback_all_sessions, +) + +async def starlette_http_db_session_middleware( + request: Request, call_next: RequestResponseEndpoint +) -> Response: + """ + Database session lifecycle management. + The session itself is created on demand in db_session(). + + Transaction auto-commit is implemented if there is no exception and + the response status is < 400. Otherwise, a rollback is performed. + + But you can commit or rollback manually in the handler. + """ + # Tests have different session management rules + # so if the context variable is already set, we do nothing + if is_context_initiated(): + return await call_next(request) + + # We set the context here, meaning all child coroutines will receive the + # same context. And even if a child coroutine requests the + # session first, the container itself is shared, and this coroutine will + # add the session to container = shared context. + token = init_db_session_ctx() + try: + response = await call_next(request) + # using the status code, we decide to commit or rollback all sessions + await auto_commit_by_status_code(response.status_code) + return response + except Exception: + # If an exception occurs, we roll all sessions back + await rollback_all_sessions() + raise + finally: + # Close all sessions and clear the context + await reset_db_session_ctx(token) +``` diff --git a/docs_sources/docs/img/basic_schema.png b/docs_sources/docs/img/basic_schema.png new file mode 100644 index 0000000..fe043fa Binary files /dev/null and b/docs_sources/docs/img/basic_schema.png differ diff --git a/docs_sources/docs/index.md b/docs_sources/docs/index.md new file mode 100644 index 0000000..3163d8d --- /dev/null +++ b/docs_sources/docs/index.md @@ -0,0 +1,72 @@ +# context-async-sqlalchemy + +[![PyPI](https://img.shields.io/pypi/v/context-async-sqlalchemy.svg)](https://pypi.org/project/context-async-sqlalchemy/) + +[SOURCE CODE](https://github.com/krylosov-aa/context-async-sqlalchemy) + +Provides a super convenient way to work with sqlalchemy in asynchronous +applications. It takes care of the issues of managing the lifecycle of engine, +session, and transactions without being a wrapper. + +The main task is to get quick and easy access to the session and not worry +about when to open and when to close it. + +The key features are: + +- Super easy to use +- Automatically manages the lifecycle of engine, session, and transaction +(autocommit/autorollback) +- It doesn't interfere with manually opening and closing sessions and +transactions when needed. +- Does not depend on the web framework +- It is not a wrapper over sqlalchemy +- It is convenient to test +- Host switching in runtime +- It can manage multiple databases and multiple sessions to a single database +- Provides tools for concurrent sql queries + + +## What does usage look like? + +```python +from context_async_sqlalchemy import db_session +from sqlalchemy import insert + +from database import connection # your configured connection to the database +from models import ExampleTable # just some model for example + +async def some_func() -> None: + # Created a session (no connection to the database yet) + session = await db_session(connection) + + stmt = insert(ExampleTable).values(text="example_with_db_session") + + # On the first request, a connection and transaction were opened + await session.execute(stmt) + + # If you call db_session again, it will return the same session + # even in child coroutines. + session = await db_session(connection) + + # The second request will use the same connection and the same transaction + await session.execute(stmt) + + # The commit and closing of the session will occur automatically +``` + +## How it works + +Here is a very simplified diagram of how everything works: + +![basic schema.png](img/basic_schema.png) + +1. Before executing your code, the middleware will prepare a container in +which the sessions required by your code will be stored. +The container is saved in contextvars +2. Your code accesses the library to create new sessions and retrieve +existing ones +3. After your code, middleware will automatically commit or roll back open +transactions. Closes open sessions and clears the context. + +The library also provides the ability to commit, rollback, and close at any +time, without waiting for the end of the request, without any problems. diff --git a/docs_sources/docs/master_replica.md b/docs_sources/docs/master_replica.md new file mode 100644 index 0000000..ea79926 --- /dev/null +++ b/docs_sources/docs/master_replica.md @@ -0,0 +1,52 @@ +# Master/Replica or several databases at the same time + + +This is why `db_session` and other functions accept `DBConnect` as input. +This way, you can work with multiple hosts simultaneously, for example, +with the master and the replica. + + +`DBConnect` also accepts factories instead of ready-made objects, so that you +can easily change the host at the right time. + +For example, libpq can detect the master and replica to create an engine. +However, it only does this once during creation. `before_create_session_handler` +helps change the host in the runtime if the master or replica changes. +You need a third-party functionality that helps determine the master or +replica. +[I hope I can give you a ready solution soon too](https://github.com/krylosov-aa/context-async-sqlalchemy/issues/2). + +The engine will not be created immediately when `DBConnect` is initialized. +This will only happen on the first request. The library is lazy in many places. + +```python +from context_async_sqlalchemy import DBConnect + +from master_replica_helper import get_master, get_replica + + +async def renew_master_connect(connect: DBConnect) -> None: + """Updates the host if the master has changed""" + master_host = await get_master() + if master_host != connect.host: + await connect.change_host(master_host) + + +master = DBConnect( + ..., + before_create_session_handler=renew_master_connect, +) + + +async def renew_replica_connect(connect: DBConnect) -> None: + """Updates the host if the replica has changed""" + replica_host = await get_replica() + if replica_host != connect.host: + await connect.change_host(replica_host) + + +replica = DBConnect( + ..., + before_create_session_handler=renew_replica_connect, +) +``` diff --git a/docs_sources/docs/testing.md b/docs_sources/docs/testing.md new file mode 100644 index 0000000..8c4d282 --- /dev/null +++ b/docs_sources/docs/testing.md @@ -0,0 +1,15 @@ +# Testing + +The library provides several ready-made utils that can be used in tests, +for example in fixtures. It helps write tests that share a common transaction +between the test and the application, so data isolation between tests is +achieved through fast transaction rollback. + + +You can see the capabilities in the examples: + +[Here are tests with a common transaction between the +application and the tests.](https://github.com/krylosov-aa/context-async-sqlalchemy/blob/main/examples/fastapi_example/tests/transactional/__init__.py) + + +[And here's an example with different transactions.](https://github.com/krylosov-aa/context-async-sqlalchemy/blob/main/examples/fastapi_example/tests/non_transactional/__init__.py) diff --git a/docs_sources/mkdocs.yml b/docs_sources/mkdocs.yml new file mode 100644 index 0000000..23b347c --- /dev/null +++ b/docs_sources/mkdocs.yml @@ -0,0 +1,12 @@ +site_name: context-async-sqlalchemy +repo_url: https://github.com/krylosov-aa/context-async-sqlalchemy +theme: + name: readthedocs + navigation_depth: 2 + collapse_navigation: true +nav: + - context-async-sqlalchemy: index.md + - Getting started: getting_started.md + - Master/Replica or several databases at the same time: master_replica.md + - Testing: testing.md + - How middleware works: how_middleware_works.md diff --git a/exmaples/__init__.py b/examples/__init__.py similarity index 100% rename from exmaples/__init__.py rename to examples/__init__.py diff --git a/exmaples/fastapi_example/__init__.py b/examples/fastapi_example/__init__.py similarity index 100% rename from exmaples/fastapi_example/__init__.py rename to examples/fastapi_example/__init__.py diff --git a/exmaples/fastapi_example/database.py b/examples/fastapi_example/database.py similarity index 97% rename from exmaples/fastapi_example/database.py rename to examples/fastapi_example/database.py index 72842d4..8625723 100644 --- a/exmaples/fastapi_example/database.py +++ b/examples/fastapi_example/database.py @@ -41,7 +41,7 @@ def create_session_maker( ) -master = DBConnect( +connection = DBConnect( host="127.0.0.1", engine_creator=create_engine, session_maker_creator=create_session_maker, diff --git a/exmaples/fastapi_example/main.py b/examples/fastapi_example/main.py similarity index 100% rename from exmaples/fastapi_example/main.py rename to examples/fastapi_example/main.py diff --git a/exmaples/fastapi_example/models.py b/examples/fastapi_example/models.py similarity index 100% rename from exmaples/fastapi_example/models.py rename to examples/fastapi_example/models.py diff --git a/exmaples/fastapi_example/pyproject.toml b/examples/fastapi_example/pyproject.toml similarity index 100% rename from exmaples/fastapi_example/pyproject.toml rename to examples/fastapi_example/pyproject.toml diff --git a/exmaples/fastapi_example/routes/__init__.py b/examples/fastapi_example/routes/__init__.py similarity index 100% rename from exmaples/fastapi_example/routes/__init__.py rename to examples/fastapi_example/routes/__init__.py diff --git a/exmaples/fastapi_example/routes/atomic_usage.py b/examples/fastapi_example/routes/atomic_usage.py similarity index 79% rename from exmaples/fastapi_example/routes/atomic_usage.py rename to examples/fastapi_example/routes/atomic_usage.py index c88e847..faa4d8e 100644 --- a/exmaples/fastapi_example/routes/atomic_usage.py +++ b/examples/fastapi_example/routes/atomic_usage.py @@ -1,7 +1,7 @@ from context_async_sqlalchemy import atomic_db_session, db_session from sqlalchemy import insert -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -14,12 +14,15 @@ async def handler_with_db_session_and_atomic() -> None: """ # the transaction will be committed or rolled back automatically # using the context manager - async with atomic_db_session(master): + async with atomic_db_session(connection): await _insert_1() + # This is a new transaction in the same connection + await _insert_1() + async def _insert_1() -> None: - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values( text="example_with_db_session_and_atomic" ) diff --git a/examples/fastapi_example/routes/early_connection_close.py b/examples/fastapi_example/routes/early_connection_close.py new file mode 100644 index 0000000..907d253 --- /dev/null +++ b/examples/fastapi_example/routes/early_connection_close.py @@ -0,0 +1,40 @@ +from context_async_sqlalchemy import ( + atomic_db_session, + close_db_session, + db_session, +) +from sqlalchemy import insert + +from ..database import connection +from ..models import ExampleTable + + +async def handler_with_early_connection_close() -> None: + """ + An example when you can return a connection to the connection pool for a + long period of work unrelated to the database + """ + async with atomic_db_session(connection): + await _insert() + + await close_db_session(connection) + + ... + # There's a lot of work going on here. + ... + + # new connect and new transaction + await _insert() + + +async def _insert() -> None: + """ + Let's imagine that the same function is useful to us in another handle, + where it is good to use it in a common transaction for the entire + request. + """ + session = await db_session(connection) + stmt = insert(ExampleTable).values( + text="example_with_early_connection_close" + ) + await session.execute(stmt) diff --git a/exmaples/fastapi_example/routes/manual_commit.py b/examples/fastapi_example/routes/manual_commit.py similarity index 85% rename from exmaples/fastapi_example/routes/manual_commit.py rename to examples/fastapi_example/routes/manual_commit.py index c5bebbb..b4f8ae6 100644 --- a/exmaples/fastapi_example/routes/manual_commit.py +++ b/examples/fastapi_example/routes/manual_commit.py @@ -5,7 +5,7 @@ ) from sqlalchemy import insert -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -23,11 +23,11 @@ async def handler_with_db_session_and_manual_close() -> None: await _insert_3() # same connect -> same transaction await _insert_3() - # autocommit in middleware + # autocommit async def _insert_1() -> None: - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values( text="example_with_db_session_and_manual_close" ) @@ -38,24 +38,24 @@ async def _insert_1() -> None: async def _insert_2() -> None: - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values( text="example_with_db_session_and_manual_close" ) await session.execute(stmt) # Here we closed the transaction - await commit_db_session(master) + await commit_db_session(connection) # And here we closed the session = returned the connection to the pool # This is useful if, for example, at the beginning of the handle a # database query is needed, and then there is some other long-term work # and you don't want to keep the connection opened. - await close_db_session(master) + await close_db_session(connection) async def _insert_3() -> None: - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values( text="example_with_db_session_and_manual_close" ) diff --git a/exmaples/fastapi_example/routes/manual_rollback.py b/examples/fastapi_example/routes/manual_rollback.py similarity index 77% rename from exmaples/fastapi_example/routes/manual_rollback.py rename to examples/fastapi_example/routes/manual_rollback.py index 7f7189b..3314378 100644 --- a/exmaples/fastapi_example/routes/manual_rollback.py +++ b/examples/fastapi_example/routes/manual_rollback.py @@ -1,7 +1,7 @@ from context_async_sqlalchemy import db_session, rollback_db_session from sqlalchemy import insert -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -11,16 +11,16 @@ async def handler_with_db_session_and_manual_rollback() -> None: """ # it's convenient this way await _insert() - await rollback_db_session(master) + await rollback_db_session(connection) # but it's possible this way too await _insert() - session = await db_session(master) + session = await db_session(connection) await session.rollback() async def _insert() -> None: - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values( text="example_with_db_session_and_manual_close" ) diff --git a/examples/fastapi_example/routes/multiple_session_usage.py b/examples/fastapi_example/routes/multiple_session_usage.py new file mode 100644 index 0000000..8f5ec1d --- /dev/null +++ b/examples/fastapi_example/routes/multiple_session_usage.py @@ -0,0 +1,71 @@ +import asyncio + +from context_async_sqlalchemy import ( + close_db_session, + commit_db_session, + db_session, + new_non_ctx_atomic_session, + new_non_ctx_session, + run_in_new_ctx, +) +from sqlalchemy import insert + +from ..database import connection +from ..models import ExampleTable + + +async def handler_multiple_sessions() -> None: + """ + In some situations, you need to have multiple sessions running + simultaneously. For example, to run several queries concurrently. + + You can also use these same techniques to create new sessions whenever you + need them. Not necessarily just because of the concurrent processing. + """ + await asyncio.gather( + _insert(), # context session + run_in_new_ctx(_insert), # new context and session with autocommit + run_in_new_ctx( # new context and session with manual commit + _insert_manual, "example_multiple_sessions", + ), + _insert_non_ctx(), # new non context session + _insert_non_ctx_manual(), # new non context session + ) + + +async def _insert() -> None: + session = await db_session(connection) + stmt = insert(ExampleTable).values(text="example_multiple_sessions") + await session.execute(stmt) + + +async def _insert_manual(text: str) -> None: + session = await db_session(connection) + stmt = insert(ExampleTable).values(text=text) + await session.execute(stmt) + + # You can manually commit the transaction if you want, but it is not + # necessary + await commit_db_session(connection) + + # You can manually close the session if you want, but it is not necessary + await close_db_session(connection) + + +async def _insert_non_ctx() -> None: + """ + You don't have to use the context to work with sessions at all + """ + async with new_non_ctx_atomic_session(connection) as session: + stmt = insert(ExampleTable).values(text="example_multiple_sessions") + await session.execute(stmt) + + +async def _insert_non_ctx_manual() -> None: + """ + You don't have to use the context to work with sessions at all + """ + async with new_non_ctx_session(connection) as session: + stmt = insert(ExampleTable).values(text="example_multiple_sessions") + await session.execute(stmt) + await session.commit() diff --git a/exmaples/fastapi_example/routes/simple_usage.py b/examples/fastapi_example/routes/simple_usage.py similarity index 85% rename from exmaples/fastapi_example/routes/simple_usage.py rename to examples/fastapi_example/routes/simple_usage.py index 628ac7a..fd21b87 100644 --- a/exmaples/fastapi_example/routes/simple_usage.py +++ b/examples/fastapi_example/routes/simple_usage.py @@ -2,7 +2,7 @@ from context_async_sqlalchemy import db_session -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -16,9 +16,11 @@ async def handler_with_db_session() -> None: # Created a session (no connection to the database yet) # If you call db_session again, it will return the same session # even in child coroutines. - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values(text="example_with_db_session") # On the first request, a connection and transaction were opened await session.execute(stmt) + + # Commit will happen automatically diff --git a/exmaples/fastapi_example/routes/simple_with_exception.py b/examples/fastapi_example/routes/simple_with_exception.py similarity index 72% rename from exmaples/fastapi_example/routes/simple_with_exception.py rename to examples/fastapi_example/routes/simple_with_exception.py index a3dc1b1..a27aeb2 100644 --- a/exmaples/fastapi_example/routes/simple_with_exception.py +++ b/examples/fastapi_example/routes/simple_with_exception.py @@ -1,7 +1,7 @@ from context_async_sqlalchemy import db_session from sqlalchemy import insert -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -9,8 +9,9 @@ async def handler_with_db_session_and_exception() -> None: """ let's imagine that an exception occurred. """ - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values(text="example_with_db_session") await session.execute(stmt) + raise Exception("Some exception") - # the transaction will be automatically rolled back in the middleware + # transaction will be automatically rolled back diff --git a/exmaples/fastapi_example/routes/simple_with_http_exception.py b/examples/fastapi_example/routes/simple_with_http_exception.py similarity index 71% rename from exmaples/fastapi_example/routes/simple_with_http_exception.py rename to examples/fastapi_example/routes/simple_with_http_exception.py index dccbdaa..e376df1 100644 --- a/exmaples/fastapi_example/routes/simple_with_http_exception.py +++ b/examples/fastapi_example/routes/simple_with_http_exception.py @@ -3,7 +3,7 @@ from context_async_sqlalchemy import db_session from sqlalchemy import insert -from ..database import master +from ..database import connection from ..models import ExampleTable @@ -11,9 +11,9 @@ async def handler_with_db_session_and_http_exception() -> None: """ let's imagine that an http exception occurred. """ - session = await db_session(master) + session = await db_session(connection) stmt = insert(ExampleTable).values(text="example_with_db_session") await session.execute(stmt) + raise HTTPException(status_code=500) - # the transaction will be automatically rolled back in the middleware by - # status code + # transaction will be automatically rolled back by status code diff --git a/exmaples/fastapi_example/setup_app.py b/examples/fastapi_example/setup_app.py similarity index 82% rename from exmaples/fastapi_example/setup_app.py rename to examples/fastapi_example/setup_app.py index b3a0087..0c18703 100644 --- a/exmaples/fastapi_example/setup_app.py +++ b/examples/fastapi_example/setup_app.py @@ -4,13 +4,16 @@ from typing import Any, AsyncGenerator from fastapi import FastAPI -from context_async_sqlalchemy import add_fastapi_db_session_middleware +from context_async_sqlalchemy.fastapi_utils import ( + add_fastapi_http_db_session_middleware, +) -from .database import master +from .database import connection from .routes.atomic_usage import handler_with_db_session_and_atomic from .routes.manual_commit import handler_with_db_session_and_manual_close from .routes.manual_rollback import handler_with_db_session_and_manual_rollback from .routes.multiple_session_usage import handler_multiple_sessions +from .routes.early_connection_close import handler_with_early_connection_close from .routes.simple_usage import handler_with_db_session from .routes.simple_with_exception import handler_with_db_session_and_exception @@ -28,7 +31,7 @@ def setup_app() -> FastAPI: app = FastAPI( lifespan=lifespan, ) - add_fastapi_db_session_middleware(app) + add_fastapi_http_db_session_middleware(app) setup_routes(app) return app @@ -37,7 +40,7 @@ def setup_app() -> FastAPI: async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]: """Database connection lifecycle management""" yield - await master.close() # Close the engine if it was open + await connection.close() # Close the engine if it was open def setup_routes(app: FastAPI) -> None: @@ -80,3 +83,8 @@ def setup_routes(app: FastAPI) -> None: handler_with_db_session_and_http_exception, methods=["POST"], ) + app.add_api_route( + "/example_with_early_connection_close", + handler_with_early_connection_close, + methods=["POST"], + ) diff --git a/exmaples/fastapi_example/tests/__init__.py b/examples/fastapi_example/tests/__init__.py similarity index 100% rename from exmaples/fastapi_example/tests/__init__.py rename to examples/fastapi_example/tests/__init__.py diff --git a/exmaples/fastapi_example/tests/conftest.py b/examples/fastapi_example/tests/conftest.py similarity index 84% rename from exmaples/fastapi_example/tests/conftest.py rename to examples/fastapi_example/tests/conftest.py index 099d057..8b1135a 100644 --- a/exmaples/fastapi_example/tests/conftest.py +++ b/examples/fastapi_example/tests/conftest.py @@ -10,8 +10,8 @@ from sqlalchemy.ext.asyncio import AsyncSession from context_async_sqlalchemy.test_utils import rollback_session -from exmaples.fastapi_example.database import master -from exmaples.fastapi_example.setup_app import lifespan, setup_app +from examples.fastapi_example.database import connection +from examples.fastapi_example.setup_app import lifespan, setup_app @pytest_asyncio.fixture @@ -37,5 +37,5 @@ async def client(app: FastAPI) -> AsyncGenerator[AsyncClient]: @pytest_asyncio.fixture async def db_session_test() -> AsyncGenerator[AsyncSession]: """The session that is used inside the test""" - async with rollback_session(master) as session: + async with rollback_session(connection) as session: yield session diff --git a/exmaples/fastapi_example/tests/non_transactional/__init__.py b/examples/fastapi_example/tests/non_transactional/__init__.py similarity index 100% rename from exmaples/fastapi_example/tests/non_transactional/__init__.py rename to examples/fastapi_example/tests/non_transactional/__init__.py diff --git a/exmaples/fastapi_example/tests/non_transactional/conftest.py b/examples/fastapi_example/tests/non_transactional/conftest.py similarity index 95% rename from exmaples/fastapi_example/tests/non_transactional/conftest.py rename to examples/fastapi_example/tests/non_transactional/conftest.py index 5416d56..1d79f26 100644 --- a/exmaples/fastapi_example/tests/non_transactional/conftest.py +++ b/examples/fastapi_example/tests/non_transactional/conftest.py @@ -12,8 +12,8 @@ from sqlalchemy import text from sqlalchemy.ext.asyncio import async_sessionmaker, AsyncSession -from exmaples.fastapi_example.database import ( - master, +from examples.fastapi_example.database import ( + connection, create_engine, create_session_maker, ) @@ -42,7 +42,7 @@ async def cleanup_tables_after( database for each worker. """ yield - session_maker = await master.get_session_maker() + session_maker = await connection.session_maker() await _cleanup_tables(session_maker) diff --git a/exmaples/fastapi_example/tests/non_transactional/test_routes.py b/examples/fastapi_example/tests/non_transactional/test_routes.py similarity index 85% rename from exmaples/fastapi_example/tests/non_transactional/test_routes.py rename to examples/fastapi_example/tests/non_transactional/test_routes.py index 6958078..fea4267 100644 --- a/exmaples/fastapi_example/tests/non_transactional/test_routes.py +++ b/examples/fastapi_example/tests/non_transactional/test_routes.py @@ -12,7 +12,7 @@ from sqlalchemy import exists, select from sqlalchemy.ext.asyncio import AsyncSession -from exmaples.fastapi_example.models import ExampleTable +from examples.fastapi_example.models import ExampleTable @pytest.mark.asyncio @@ -51,8 +51,10 @@ async def test_example_with_db_session_and_atomic( assert response.status_code == HTTPStatus.OK result = await db_session_test.execute(select(ExampleTable)) - row = result.scalar_one() - assert row.text == "example_with_db_session_and_atomic" + rows = result.scalars().all() + assert len(rows) == 2 + for row in rows: + assert row.text == "example_with_db_session_and_atomic" @pytest.mark.asyncio @@ -165,3 +167,23 @@ async def test_example_with_http_exception( select(exists().select_from(ExampleTable)) ) assert exist_row.scalar() is False + + +@pytest.mark.asyncio +async def test_example_with_early_connection_close( + client: AsyncClient, + db_session_test: AsyncSession, +) -> None: + # Act + response = await client.post( + "/example_with_early_connection_close", + ) + + # Assert + assert response.status_code == HTTPStatus.OK + + result = await db_session_test.execute(select(ExampleTable)) + rows = result.scalars().all() + assert len(rows) == 2 + for row in rows: + assert row.text == "example_with_early_connection_close" diff --git a/exmaples/fastapi_example/tests/transactional/__init__.py b/examples/fastapi_example/tests/transactional/__init__.py similarity index 100% rename from exmaples/fastapi_example/tests/transactional/__init__.py rename to examples/fastapi_example/tests/transactional/__init__.py diff --git a/exmaples/fastapi_example/tests/transactional/conftest.py b/examples/fastapi_example/tests/transactional/conftest.py similarity index 88% rename from exmaples/fastapi_example/tests/transactional/conftest.py rename to examples/fastapi_example/tests/transactional/conftest.py index 8896a51..66853b8 100644 --- a/exmaples/fastapi_example/tests/transactional/conftest.py +++ b/examples/fastapi_example/tests/transactional/conftest.py @@ -19,7 +19,7 @@ put_savepoint_session_in_ctx, set_test_context, ) -from exmaples.fastapi_example.database import master +from examples.fastapi_example.database import connection @pytest_asyncio.fixture(autouse=True) @@ -32,5 +32,5 @@ async def db_session_override( if it already exists. """ async with set_test_context(): - async with put_savepoint_session_in_ctx(master, db_session_test): + async with put_savepoint_session_in_ctx(connection, db_session_test): yield diff --git a/exmaples/fastapi_example/tests/transactional/test_routes.py b/examples/fastapi_example/tests/transactional/test_routes.py similarity index 88% rename from exmaples/fastapi_example/tests/transactional/test_routes.py rename to examples/fastapi_example/tests/transactional/test_routes.py index bd44bc2..4b28a50 100644 --- a/exmaples/fastapi_example/tests/transactional/test_routes.py +++ b/examples/fastapi_example/tests/transactional/test_routes.py @@ -17,7 +17,7 @@ from sqlalchemy import select from sqlalchemy.ext.asyncio import AsyncSession -from exmaples.fastapi_example.models import ExampleTable +from examples.fastapi_example.models import ExampleTable @pytest.mark.asyncio @@ -56,5 +56,7 @@ async def test_example_with_db_session_and_atomic( assert response.status_code == HTTPStatus.OK result = await db_session_test.execute(select(ExampleTable)) - row = result.scalar_one() - assert row.text == "example_with_db_session_and_atomic" + rows = result.scalars().all() + assert len(rows) == 2 + for row in rows: + assert row.text == "example_with_db_session_and_atomic" diff --git a/exmaples/fastapi_example/uv.lock b/examples/fastapi_example/uv.lock similarity index 100% rename from exmaples/fastapi_example/uv.lock rename to examples/fastapi_example/uv.lock diff --git a/exmaples/fastapi_example/routes/multiple_session_usage.py b/exmaples/fastapi_example/routes/multiple_session_usage.py deleted file mode 100644 index 0df00bf..0000000 --- a/exmaples/fastapi_example/routes/multiple_session_usage.py +++ /dev/null @@ -1,58 +0,0 @@ -import asyncio - -from context_async_sqlalchemy import ( - atomic_db_session, - close_db_session, - commit_db_session, - db_session, - new_non_ctx_atomic_session, - new_non_ctx_session, - run_in_new_ctx, -) -from sqlalchemy import insert - -from ..database import master -from ..models import ExampleTable - - -async def handler_multiple_sessions() -> None: - """ - In some situations, you need to have multiple sessions running - simultaneously. For example, to run several queries concurrently. - """ - await asyncio.gather( - _insert(), - run_in_new_ctx(_insert), - run_in_new_ctx(_insert_manual), - _insert_non_ctx(), - _insert_non_ctx_manual(), - ) - - -async def _insert() -> None: - async with atomic_db_session(master) as session: - stmt = insert(ExampleTable).values(text="example_multiple_sessions") - await session.execute(stmt) - - -async def _insert_manual() -> None: - session = await db_session(master) - stmt = insert(ExampleTable).values(text="example_multiple_sessions") - await session.execute(stmt) - await commit_db_session(master) - - # You can manually close the session if you want, but it is not necessary - await close_db_session(master) - - -async def _insert_non_ctx() -> None: - async with new_non_ctx_atomic_session(master) as session: - stmt = insert(ExampleTable).values(text="example_multiple_sessions") - await session.execute(stmt) - - -async def _insert_non_ctx_manual() -> None: - async with new_non_ctx_session(master) as session: - stmt = insert(ExampleTable).values(text="example_multiple_sessions") - await session.execute(stmt) - await session.commit() diff --git a/mypy.ini b/mypy.ini index f6765ff..66e9b73 100644 --- a/mypy.ini +++ b/mypy.ini @@ -1,6 +1,3 @@ [mypy] strict = true pretty = true - -;[mypy-tests.*] -;disable_error_code = no-untyped-def, index diff --git a/pyproject.toml b/pyproject.toml index 70c7edd..b90a8f9 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -18,6 +18,8 @@ dev = [ "fastapi>=0.121.1", "greenlet>=3.2.4", "httpx>=0.28.1", + "mkdocs>=1.6.1", + "mkdocs-material>=9.7.0", "mypy>=1.18.2", "psycopg2-binary>=2.9.11", "pydantic>=2.12.4", diff --git a/setup.cfg b/setup.cfg index 08cb8cc..27a91ca 100644 --- a/setup.cfg +++ b/setup.cfg @@ -1,12 +1,6 @@ [flake8] exclude = .venv -ignore=WPS110, WPS410, WPS300, WPS412, WPS347, F401, F403, WPS226, WPS501 - , WPS229, WPS211, W503, WPS202, WPS407, WPS114, WPS604, WPS237, WPS111 - , WPS238, WPS201, WPS204, 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