core[minor],langchain[patch],community[patch]: Move storage interfaces to core (#20750)

* Move storage interface to core
* Move in memory and file system implementation to core

libs/core/tests/unit_tests/stores/test_in_memory.py

@@ -0,0 +1,95 @@
+from langchain_core.stores import InMemoryStore
+
+
+def test_mget() -> None:
+    store = InMemoryStore()
+    store.mset([("key1", "value1"), ("key2", "value2")])
+
+    values = store.mget(["key1", "key2"])
+    assert values == ["value1", "value2"]
+
+    # Test non-existent key
+    non_existent_value = store.mget(["key3"])
+    assert non_existent_value == [None]
+
+
+async def test_amget() -> None:
+    store = InMemoryStore()
+    await store.amset([("key1", "value1"), ("key2", "value2")])
+
+    values = await store.amget(["key1", "key2"])
+    assert values == ["value1", "value2"]
+
+    # Test non-existent key
+    non_existent_value = await store.amget(["key3"])
+    assert non_existent_value == [None]
+
+
+def test_mset() -> None:
+    store = InMemoryStore()
+    store.mset([("key1", "value1"), ("key2", "value2")])
+
+    values = store.mget(["key1", "key2"])
+    assert values == ["value1", "value2"]
+
+
+async def test_amset() -> None:
+    store = InMemoryStore()
+    await store.amset([("key1", "value1"), ("key2", "value2")])
+
+    values = await store.amget(["key1", "key2"])
+    assert values == ["value1", "value2"]
+
+
+def test_mdelete() -> None:
+    store = InMemoryStore()
+    store.mset([("key1", "value1"), ("key2", "value2")])
+
+    store.mdelete(["key1"])
+
+    values = store.mget(["key1", "key2"])
+    assert values == [None, "value2"]
+
+    # Test deleting non-existent key
+    store.mdelete(["key3"])  # No error should be raised
+
+
+async def test_amdelete() -> None:
+    store = InMemoryStore()
+    await store.amset([("key1", "value1"), ("key2", "value2")])
+
+    await store.amdelete(["key1"])
+
+    values = await store.amget(["key1", "key2"])
+    assert values == [None, "value2"]
+
+    # Test deleting non-existent key
+    await store.amdelete(["key3"])  # No error should be raised
+
+
+def test_yield_keys() -> None:
+    store = InMemoryStore()
+    store.mset([("key1", "value1"), ("key2", "value2"), ("key3", "value3")])
+
+    keys = list(store.yield_keys())
+    assert set(keys) == {"key1", "key2", "key3"}
+
+    keys_with_prefix = list(store.yield_keys(prefix="key"))
+    assert set(keys_with_prefix) == {"key1", "key2", "key3"}
+
+    keys_with_invalid_prefix = list(store.yield_keys(prefix="x"))
+    assert keys_with_invalid_prefix == []
+
+
+async def test_ayield_keys() -> None:
+    store = InMemoryStore()
+    await store.amset([("key1", "value1"), ("key2", "value2"), ("key3", "value3")])
+
+    keys = [key async for key in store.ayield_keys()]
+    assert set(keys) == {"key1", "key2", "key3"}
+
+    keys_with_prefix = [key async for key in store.ayield_keys(prefix="key")]
+    assert set(keys_with_prefix) == {"key1", "key2", "key3"}
+
+    keys_with_invalid_prefix = [key async for key in store.ayield_keys(prefix="x")]
+    assert keys_with_invalid_prefix == []