feat: add support for .b2z, .b2d, .b2e files and update related tests

src/blosc2/dict_store.py

@@ -153,15 +153,15 @@ def _init_read_mode(self, dparams: blosc2.DParams | None = None):
             if "embed.b2e" not in self.offsets:
                 raise FileNotFoundError("Embed file embed.b2e not found in store.")
             estore_offset = self.offsets["embed.b2e"]["offset"]
-            schunk = blosc2.open(self.b2z_path, mode="r", offset=estore_offset, dparams=dparams)
+            schunk = blosc2.blosc2_ext.open(self.b2z_path, mode="r", offset=estore_offset, dparams=dparams)
             for filepath in self.offsets:
                 if filepath.endswith((".b2nd", ".b2f")):
                     key = "/" + filepath[: -5 if filepath.endswith(".b2nd") else -4]
                     self.map_tree[key] = filepath
         else:  # .b2d
             if not os.path.isdir(self.localpath):
                 raise FileNotFoundError(f"Directory {self.localpath} does not exist for reading.")
-            schunk = blosc2.open(self.estore_path, mode="r", dparams=dparams)
+            schunk = blosc2.blosc2_ext.open(self.estore_path, mode="r", offset=0, dparams=dparams)
             self._update_map_tree()
 
         self._estore = EmbedStore(_from_schunk=schunk)
@@ -267,7 +267,7 @@ def __getitem__(self, key: str) -> blosc2.NDArray | SChunk | C2Array:
             filepath = self.map_tree[key]
             if filepath in self.offsets:
                 offset = self.offsets[filepath]["offset"]
-                return blosc2.open(self.b2z_path, mode="r", offset=offset, dparams=self.dparams)
+                return blosc2.blosc2_ext.open(self.b2z_path, mode="r", offset=offset, dparams=self.dparams)
             else:
                 urlpath = os.path.join(self.working_dir, filepath)
                 if os.path.exists(urlpath):
@@ -331,7 +331,9 @@ def values(self) -> Iterator[blosc2.NDArray | SChunk | C2Array]:
                 if self.is_zip_store:
                     if filepath in self.offsets:
                         offset = self.offsets[filepath]["offset"]
-                        yield blosc2.open(self.b2z_path, mode="r", offset=offset, dparams=self.dparams)
+                        yield blosc2.blosc2_ext.open(
+                            self.b2z_path, mode="r", offset=offset, dparams=self.dparams
+                        )
                 else:
                     urlpath = os.path.join(self.working_dir, filepath)
                     yield blosc2.open(urlpath, mode="r" if self.mode == "r" else "a", dparams=self.dparams)
@@ -350,7 +352,7 @@ def items(self) -> Iterator[tuple[str, blosc2.NDArray | SChunk | C2Array]]:
                 if self.is_zip_store:
                     if filepath in self.offsets:
                         offset = self.offsets[filepath]["offset"]
-                        yield key, blosc2.open(self.b2z_path, mode="r", offset=offset)
+                        yield key, blosc2.blosc2_ext.open(self.b2z_path, mode="r", offset=offset)
                 else:
                     urlpath = os.path.join(self.working_dir, filepath)
                     yield key, blosc2.open(urlpath, mode="r" if self.mode == "r" else "a")

src/blosc2/embed_store.py

@@ -108,7 +108,7 @@ def __init__(
             self.storage = storage
 
         if mode in ("r", "a") and urlpath:
-            self._store = blosc2.open(urlpath, mode=mode)
+            self._store = blosc2.blosc2_ext.open(urlpath, mode=mode, offset=0)
             self._load_metadata()
             return
 
@@ -254,6 +254,15 @@ def to_cframe(self) -> bytes:
         """Serialize embed store to CFrame format."""
         return self._store.to_cframe()
 
+    def __enter__(self):
+        """Context manager enter."""
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Context manager exit."""
+        # No need to close anything as SChunk/NDArray handles persistence automatically
+        return False
+
 
 def estore_from_cframe(cframe: bytes, copy: bool = False) -> EmbedStore:
     """

src/blosc2/schunk.py

@@ -1470,11 +1470,59 @@ def __dealloc__(self):
         super().__dealloc__()
 
 
+def _open_special_store(urlpath, mode, offset, **kwargs):
+    if urlpath.endswith(".b2z") or urlpath.endswith(".b2d"):
+        if offset != 0:
+            raise ValueError("Offset must be 0 for DictStore")
+        from blosc2.dict_store import DictStore
+
+        return DictStore(urlpath, mode=mode, **kwargs)
+    elif urlpath.endswith(".b2e"):
+        if offset != 0:
+            raise ValueError("Offset must be 0 for EmbedStore")
+        from blosc2.embed_store import EmbedStore
+
+        return EmbedStore(urlpath, mode=mode, **kwargs)
+    return None
+
+
+def _set_default_dparams(kwargs):
+    dparams = kwargs.get("dparams")
+    if dparams is None:
+        # Use multiple threads for decompression by default, unless we are in WASM
+        # (does not support threads).  The only drawback for using multiple threads
+        # is that access time will be slower because of the overhead of spawning threads
+        # (but could be fixed in the future with more intelligent thread pools).
+        dparams = (
+            blosc2.DParams(nthreads=blosc2.nthreads) if not blosc2.IS_WASM else blosc2.DParams(nthreads=1)
+        )
+        kwargs["dparams"] = dparams
+
+
+def _process_opened_object(res):
+    meta = getattr(res, "schunk", res).meta
+    if "proxy-source" in meta:
+        proxy_src = meta["proxy-source"]
+        if proxy_src["local_abspath"] is not None:
+            src = blosc2.open(proxy_src["local_abspath"])
+            return blosc2.Proxy(src, _cache=res)
+        elif proxy_src["urlpath"] is not None:
+            src = blosc2.C2Array(proxy_src["urlpath"][0], proxy_src["urlpath"][1], proxy_src["urlpath"][2])
+            return blosc2.Proxy(src, _cache=res)
+        elif not proxy_src["caterva2_env"]:
+            raise RuntimeError("Could not find the source when opening a Proxy")
+
+    if isinstance(res, blosc2.NDArray) and "LazyArray" in res.schunk.meta:
+        return blosc2._open_lazyarray(res)
+    else:
+        return res
+
+
 def open(
     urlpath: str | pathlib.Path | blosc2.URLPath, mode: str = "a", offset: int = 0, **kwargs: dict
-) -> blosc2.SChunk | blosc2.NDArray | blosc2.C2Array | blosc2.LazyArray | blosc2.Proxy:
-    """Open a persistent :ref:`SChunk`, :ref:`NDArray`, a remote :ref:`C2Array`
-    or a :ref:`Proxy`
+) -> blosc2.SChunk | blosc2.NDArray | blosc2.C2Array | blosc2.LazyArray | blosc2.Proxy | Any:
+    """Open a persistent :ref:`SChunk`, :ref:`NDArray`, a remote :ref:`C2Array`,
+    a :ref:`Proxy`, a :ref:`DictStore` or an :ref:`EmbedStore`.
 
     See the `Notes` section for more info on opening `Proxy` objects.
 
@@ -1510,9 +1558,8 @@ def open(
 
     Returns
     -------
-    out: :ref:`SChunk`, :ref:`NDArray` or :ref:`C2Array`
-        The SChunk or NDArray (if there is a "b2nd" metalayer")
-        or the C2Array if :paramref:`urlpath` is a :ref:`blosc2.URLPath <URLPath>` instance.
+    out: :ref:`SChunk`, :ref:`NDArray`, :ref:`C2Array`, :ref:`DictStore` or :ref:`EmbedStore`
+        The object found in the path.
 
     Notes
     -----
@@ -1577,34 +1624,15 @@ def open(
 
     if isinstance(urlpath, pathlib.PurePath):
         urlpath = str(urlpath)
+
+    special = _open_special_store(urlpath, mode, offset, **kwargs)
+    if special is not None:
+        return special
+
     if not os.path.exists(urlpath):
         raise FileNotFoundError(f"No such file or directory: {urlpath}")
 
-    dparams = kwargs.get("dparams")
-    if dparams is None:
-        # Use multiple threads for decompression by default, unless we are in WASM
-        # (does not support threads).  The only drawback for using multiple threads
-        # is that access time will be slower because of the overhead of spawning threads
-        # (but could be fixed in the future with more intelligent thread pools).
-        dparams = (
-            blosc2.DParams(nthreads=blosc2.nthreads) if not blosc2.IS_WASM else blosc2.DParams(nthreads=1)
-        )
-        kwargs["dparams"] = dparams
+    _set_default_dparams(kwargs)
     res = blosc2_ext.open(urlpath, mode, offset, **kwargs)
 
-    meta = getattr(res, "schunk", res).meta
-    if "proxy-source" in meta:
-        proxy_src = meta["proxy-source"]
-        if proxy_src["local_abspath"] is not None:
-            src = blosc2.open(proxy_src["local_abspath"])
-            return blosc2.Proxy(src, _cache=res)
-        elif proxy_src["urlpath"] is not None:
-            src = blosc2.C2Array(proxy_src["urlpath"][0], proxy_src["urlpath"][1], proxy_src["urlpath"][2])
-            return blosc2.Proxy(src, _cache=res)
-        elif not proxy_src["caterva2_env"]:
-            raise RuntimeError("Could not find the source when opening a Proxy")
-
-    if isinstance(res, blosc2.NDArray) and "LazyArray" in res.schunk.meta:
-        return blosc2._open_lazyarray(res)
-    else:
-        return res
+    return _process_opened_object(res)

tests/test_dict_store.py

@@ -436,3 +436,16 @@ def test_get_with_different_types():
     finally:
         if os.path.exists(path):
             os.remove(path)
+
+
+def test_open_context_manager(populated_dict_store):
+    """Test opening via blosc2.open as a context manager."""
+    dstore_fixture, path = populated_dict_store
+    # Close the fixture store to ensure data is written to disk
+    dstore_fixture.close()
+
+    # Test opening via blosc2.open as a context manager
+    with blosc2.open(path, mode="r") as dstore:
+        assert isinstance(dstore, DictStore)
+        assert "/node1" in dstore
+        assert np.array_equal(dstore["/node1"][:], np.array([1, 2, 3]))

tests/test_embed_store.py

@@ -19,7 +19,7 @@ def cleanup_files():
         "test_estore.b2e",
         "external_node3.b2nd",
     ]
-    yield
+    yield files
     for f in files:
         if os.path.exists(f):
             os.remove(f)
@@ -201,3 +201,19 @@ def test_store_and_retrieve_schunk():
     assert value.nbytes == len(data)
     assert value[:] == data
     assert value.vlmeta["description"] == vlmeta
+
+
+def test_open_context_manager(cleanup_files):
+    """Test opening via blosc2.open as a context manager."""
+    path = "test_embed_open.b2e"
+    cleanup_files.append(path)
+
+    # Create an EmbedStore
+    estore = blosc2.EmbedStore(path, mode="w")
+    estore["/node1"] = np.arange(10)
+
+    # Test opening via blosc2.open as a context manager
+    with blosc2.open(path, mode="r") as estore_read:
+        assert isinstance(estore_read, blosc2.EmbedStore)
+        assert "/node1" in estore_read
+        assert np.array_equal(estore_read["/node1"][:], np.arange(10))