Merge pull request #29 from powersync-ja/mongo-demo

[Feature] MongoDB Demo

Author: kobiebotha

CHANGELOG.md

@@ -1,5 +1,9 @@
 # PowerSync Self Hosted Example
 
+## v0.5.0
+
+- Added alpha demo for MongoDB replication
+
 ## v0.4.1
 
 - Cleaned `powersync.yaml` config file placeholder values

README.md

@@ -10,10 +10,14 @@ Learn more about self-hosting PowerSync [here](https://docs.powersync.com/self-h
 
 This repository contains basic demonstrations in the `demos` folder.
 
-- [NodeJS](./demos/nodejs/README.md)
+- [NodeJS (Postgres)](./demos/nodejs/README.md)
 
   - This can be started from the repo root with `docker compose -f demos/nodejs/docker-compose.yaml up`
 
+- [NodeJS (MongoDB)](./demos/nodejs-mongodb/README.md)
+
+  - This can be started from the repo root with `docker compose -f demos/nodejs-mongodb/docker-compose.yaml up`
+
 - [Django](./demos/django/README.md)
 
   - This can be started from the repo root with `docker compose -f demos/django/docker-compose.yaml up`

config/powersync.yaml

@@ -38,7 +38,7 @@ replication:
 
       # The connection URI or individual parameters can be specified.
       # Individual params take precedence over URI params
-      uri: !env PS_PG_URI
+      uri: !env PS_DATA_SOURCE_URI
 
       # Or use individual params
 

demos/django/.env

@@ -3,7 +3,7 @@ PG_DATABASE_NAME=django_demo
 PG_DATABASE_PORT=5432
 PG_DATABASE_USER=postgres
 PG_DATABASE_PASSWORD=mypassword
-
+PS_DATA_SOURCE_URI=postgres://${PG_DATABASE_USER}:${PG_DATABASE_PASSWORD}@pg-db:${PG_DATABASE_PORT}/${PG_DATABASE_NAME}
 # ==================== Demo config =========================================
 DEMO_BACKEND_PORT=6061
 # The front-end demo application is accessible at this port on the host machine

demos/nodejs-mongodb/.env

@@ -0,0 +1,19 @@
+# ==================== MongoDB credentials ================================
+PS_DATA_SOURCE_URI=mongodb://mongo:27017/powersync_demo_backend
+
+# ==================== Demo config =========================================
+DEMO_BACKEND_PORT=6060
+DEMO_BACKEND_DATABASE_TYPE=mongodb
+DEMO_BACKEND_DATABASE_URI=${PS_DATA_SOURCE_URI}
+# The front-end demo application is accessible at this port on the host machine
+DEMO_CLIENT_PORT=3033
+PS_JWKS_URL=http://demo-backend:${DEMO_BACKEND_PORT}/api/auth/keys
+
+# These can be generated by following the instructions in the `key-generator` folder
+# A temporary key will be used if these are not specified
+DEMO_JWKS_PUBLIC_KEY=
+DEMO_JWKS_PRIVATE_KEY=
+
+# ==================== PowerSync variables ====================
+# The PowerSync API is accessible via this port
+PS_PORT=8080

demos/nodejs-mongodb/README.md

@@ -0,0 +1,23 @@
+# JavaScript PowerSync + MongoDB Self Hosted Demo
+
+This demo contains a NodeJS + MongoDB backend and React frontend which are linked to a self hosted PowerSync instance.
+
+Backend code can be found [here](https://github.com/powersync-ja/powersync-nodejs-backend-todolist-demo)
+
+## Running
+
+The `.env` file contains default configuration for the services. Reference this to connect to any services locally.
+
+This demo can be started by running the following in this demo directory
+
+```bash
+docker compose up
+```
+
+or in the root directory run
+
+```bash
+docker compose -f demos/nodejs-mongodb/docker-compose.yaml up
+```
+
+The frontend can be accessed at `http://localhost:3033` in a browser.

demos/nodejs-mongodb/config/powersync.yaml

@@ -0,0 +1,29 @@
+# yaml-language-server: $schema=../schema/schema.json
+telemetry:
+  # Opt out of reporting anonymized usage metrics to PowerSync telemetry service
+  disable_telemetry_sharing: false
+
+# Settings for source database replication
+replication:
+  connections:
+    - type: mongodb
+      uri: !env PS_DATA_SOURCE_URI
+
+# Connection settings for sync bucket storage
+storage:
+  type: mongodb
+  uri: !env PS_MONGO_URI
+
+# The port which the PowerSync API server will listen on
+port: !env PS_PORT
+
+# Specify sync rules
+sync_rules:
+  path: sync_rules.yaml
+
+# Client (application end user) authentication settings
+client_auth:
+  # JWKS URIs can be specified here
+  jwks_uri: !env PS_JWKS_URL
+
+  audience: ["powersync-dev", "powersync"]

demos/nodejs-mongodb/config/sync_rules.yaml

@@ -0,0 +1,10 @@
+# See Documentation for more information:
+# https://docs.powersync.com/usage/sync-rules
+# Note that changes to this file are not watched.
+# The service needs to be restarted for changes to take effect.
+bucket_definitions:
+  global:
+    data:
+      # mongodb uses _id as the primary key. * excludes _ fields.
+      - select _id as id, * from lists
+      - select _id as id, * from todos

demos/nodejs-mongodb/docker-compose.yaml

@@ -0,0 +1,22 @@
+# Include syntax requires Docker compose > 2.20.3
+# https://docs.docker.com/compose/release-notes/#2203
+include:
+  # Creates a MongoDB replica set. This is used for internal and data storage
+  - path: ../../services/mongo.yaml
+
+  # Demo NodeJS backend server and front-end web client
+  - path: ../nodejs/ps-nodejs-demo.yaml
+
+services:
+  # Extend PowerSync with Mongo and Postgres healthchecks
+  powersync:
+    extends:
+      file: ../../services/powersync.yaml
+      service: powersync
+    depends_on:
+      mongo-rs-init:
+        condition: service_completed_successfully
+        # MongoDB support is available via this image version
+    image: journeyapps/powersync-service:0.0.0-dev-20240919151547
+    volumes:
+      - ./config:/config

demos/nodejs/.env

@@ -3,9 +3,12 @@ PG_DATABASE_NAME=postgres
 PG_DATABASE_PORT=5432
 PG_DATABASE_USER=postgres
 PG_DATABASE_PASSWORD=mypassword
+PS_DATA_SOURCE_URI=postgres://${PG_DATABASE_USER}:${PG_DATABASE_PASSWORD}@pg-db:${PG_DATABASE_PORT}/${PG_DATABASE_NAME}
 
 # ==================== Demo config =========================================
 DEMO_BACKEND_PORT=6060
+DEMO_BACKEND_DATABASE_TYPE=postgres
+DEMO_BACKEND_DATABASE_URI=postgres://${PG_DATABASE_USER}:${PG_DATABASE_PASSWORD}@pg-db:${PG_DATABASE_PORT}/${PG_DATABASE_NAME}
 # The front-end demo application is accessible at this port on the host machine
 DEMO_CLIENT_PORT=3030
 PS_JWKS_URL=http://demo-backend:${DEMO_BACKEND_PORT}/api/auth/keys