langchain[patch]: Upgrade storage to treat langchain community as optional (#21105)

libs/langchain/langchain/storage/__init__.py

@@ -5,48 +5,52 @@ to a simple key-value interface.
 
 The primary goal of these storages is to support implementation of caching.
 """
-import warnings
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
-from langchain_core._api import LangChainDeprecationWarning
 from langchain_core.stores import (
     InMemoryByteStore,
     InMemoryStore,
     InvalidKeyException,
 )
 
+from langchain._api import create_importer
 from langchain.storage._lc_store import create_kv_docstore, create_lc_store
 from langchain.storage.encoder_backed import EncoderBackedStore
 from langchain.storage.file_system import LocalFileStore
-from langchain.utils.interactive_env import is_interactive_env
+
+if TYPE_CHECKING:
+    from langchain_community.storage import (
+        RedisStore,
+        UpstashRedisByteStore,
+        UpstashRedisStore,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "RedisStore": "langchain_community.storage",
+    "UpstashRedisByteStore": "langchain_community.storage",
+    "UpstashRedisStore": "langchain_community.storage",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
 
 
 def __getattr__(name: str) -> Any:
-    from langchain_community import storage
-
-    # If not in interactive env, raise warning.
-    if not is_interactive_env():
-        warnings.warn(
-            "Importing stores from langchain is deprecated. Importing from "
-            "langchain will no longer be supported as of langchain==0.2.0. "
-            "Please import from langchain-community instead:\n\n"
-            f"`from langchain_community.storage import {name}`.\n\n"
-            "To install langchain-community run `pip install -U langchain-community`.",
-            category=LangChainDeprecationWarning,
-        )
-
-    return getattr(storage, name)
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
 
 
 __all__ = [
-    "EncoderBackedStore",
-    "RedisStore",
-    "create_lc_store",
     "create_kv_docstore",
-    "LocalFileStore",
+    "create_lc_store",
+    "EncoderBackedStore",
+    "InMemoryByteStore",
     "InMemoryStore",
     "InvalidKeyException",
-    "InMemoryByteStore",
+    "LocalFileStore",
+    "RedisStore",
     "UpstashRedisByteStore",
     "UpstashRedisStore",
 ]

libs/langchain/langchain/storage/redis.py

@@ -1,3 +1,23 @@
-from langchain_community.storage.redis import RedisStore
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["RedisStore"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.storage import RedisStore
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"RedisStore": "langchain_community.storage"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "RedisStore",
+]

libs/langchain/langchain/storage/upstash_redis.py

@@ -1,6 +1,27 @@
-from langchain_community.storage.upstash_redis import (
-    UpstashRedisByteStore,
-    UpstashRedisStore,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["UpstashRedisStore", "UpstashRedisByteStore"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.storage import UpstashRedisByteStore, UpstashRedisStore
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "UpstashRedisStore": "langchain_community.storage",
+    "UpstashRedisByteStore": "langchain_community.storage",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "UpstashRedisStore",
+    "UpstashRedisByteStore",
+]