community[minor]: Add async methods to AstraDBLoader (#16652)

libs/community/tests/integration_tests/document_loaders/test_astradb.py

@@ -13,11 +13,18 @@ Required to run this test:
 import json
 import os
 import uuid
+from typing import TYPE_CHECKING
 
 import pytest
 
 from langchain_community.document_loaders.astradb import AstraDBLoader
 
+if TYPE_CHECKING:
+    from astrapy.db import (
+        AstraDBCollection,
+        AsyncAstraDBCollection,
+    )
+
 ASTRA_DB_APPLICATION_TOKEN = os.getenv("ASTRA_DB_APPLICATION_TOKEN")
 ASTRA_DB_API_ENDPOINT = os.getenv("ASTRA_DB_API_ENDPOINT")
 ASTRA_DB_KEYSPACE = os.getenv("ASTRA_DB_KEYSPACE")
@@ -28,7 +35,7 @@ def _has_env_vars() -> bool:
 
 
 @pytest.fixture
-def astra_db_collection():
+def astra_db_collection() -> "AstraDBCollection":
     from astrapy.db import AstraDB
 
     astra_db = AstraDB(
@@ -38,21 +45,41 @@ def astra_db_collection():
     )
     collection_name = f"lc_test_loader_{str(uuid.uuid4()).split('-')[0]}"
     collection = astra_db.create_collection(collection_name)
+    collection.insert_many([{"foo": "bar", "baz": "qux"}] * 20)
+    collection.insert_many(
+        [{"foo": "bar2", "baz": "qux"}] * 4 + [{"foo": "bar", "baz": "qux"}] * 4
+    )
 
     yield collection
 
     astra_db.delete_collection(collection_name)
 
 
+@pytest.fixture
+async def async_astra_db_collection() -> "AsyncAstraDBCollection":
+    from astrapy.db import AsyncAstraDB
+
+    astra_db = AsyncAstraDB(
+        token=ASTRA_DB_APPLICATION_TOKEN,
+        api_endpoint=ASTRA_DB_API_ENDPOINT,
+        namespace=ASTRA_DB_KEYSPACE,
+    )
+    collection_name = f"lc_test_loader_{str(uuid.uuid4()).split('-')[0]}"
+    collection = await astra_db.create_collection(collection_name)
+    await collection.insert_many([{"foo": "bar", "baz": "qux"}] * 20)
+    await collection.insert_many(
+        [{"foo": "bar2", "baz": "qux"}] * 4 + [{"foo": "bar", "baz": "qux"}] * 4
+    )
+
+    yield collection
+
+    await astra_db.delete_collection(collection_name)
+
+
 @pytest.mark.requires("astrapy")
 @pytest.mark.skipif(not _has_env_vars(), reason="Missing Astra DB env. vars")
 class TestAstraDB:
-    def test_astradb_loader(self, astra_db_collection) -> None:
-        astra_db_collection.insert_many([{"foo": "bar", "baz": "qux"}] * 20)
-        astra_db_collection.insert_many(
-            [{"foo": "bar2", "baz": "qux"}] * 4 + [{"foo": "bar", "baz": "qux"}] * 4
-        )
-
+    def test_astradb_loader(self, astra_db_collection: "AstraDBCollection") -> None:
         loader = AstraDBLoader(
             astra_db_collection.collection_name,
             token=ASTRA_DB_APPLICATION_TOKEN,
@@ -79,9 +106,9 @@ class TestAstraDB:
                 "collection": astra_db_collection.collection_name,
             }
 
-    def test_extraction_function(self, astra_db_collection) -> None:
-        astra_db_collection.insert_many([{"foo": "bar", "baz": "qux"}] * 20)
-
+    def test_extraction_function(
+        self, astra_db_collection: "AstraDBCollection"
+    ) -> None:
         loader = AstraDBLoader(
             astra_db_collection.collection_name,
             token=ASTRA_DB_APPLICATION_TOKEN,
@@ -94,3 +121,51 @@ class TestAstraDB:
         doc = next(docs)
 
         assert doc.page_content == "bar"
+
+    async def test_astradb_loader_async(
+        self, async_astra_db_collection: "AsyncAstraDBCollection"
+    ) -> None:
+        await async_astra_db_collection.insert_many([{"foo": "bar", "baz": "qux"}] * 20)
+        await async_astra_db_collection.insert_many(
+            [{"foo": "bar2", "baz": "qux"}] * 4 + [{"foo": "bar", "baz": "qux"}] * 4
+        )
+
+        loader = AstraDBLoader(
+            async_astra_db_collection.collection_name,
+            token=ASTRA_DB_APPLICATION_TOKEN,
+            api_endpoint=ASTRA_DB_API_ENDPOINT,
+            namespace=ASTRA_DB_KEYSPACE,
+            nb_prefetched=1,
+            projection={"foo": 1},
+            find_options={"limit": 22},
+            filter_criteria={"foo": "bar"},
+        )
+        docs = await loader.aload()
+
+        assert len(docs) == 22
+        ids = set()
+        for doc in docs:
+            content = json.loads(doc.page_content)
+            assert content["foo"] == "bar"
+            assert "baz" not in content
+            assert content["_id"] not in ids
+            ids.add(content["_id"])
+            assert doc.metadata == {
+                "namespace": async_astra_db_collection.astra_db.namespace,
+                "api_endpoint": async_astra_db_collection.astra_db.base_url,
+                "collection": async_astra_db_collection.collection_name,
+            }
+
+    async def test_extraction_function_async(
+        self, async_astra_db_collection: "AsyncAstraDBCollection"
+    ) -> None:
+        loader = AstraDBLoader(
+            async_astra_db_collection.collection_name,
+            token=ASTRA_DB_APPLICATION_TOKEN,
+            api_endpoint=ASTRA_DB_API_ENDPOINT,
+            namespace=ASTRA_DB_KEYSPACE,
+            find_options={"limit": 30},
+            extraction_function=lambda x: x["foo"],
+        )
+        doc = await anext(loader.alazy_load())
+        assert doc.page_content == "bar"