langchain/tests/integration_tests/memory/test_momento.py
Michael Landis 7047a2c1af
feat: add Momento as a standard cache and chat message history provider (#5221)
# Add Momento as a standard cache and chat message history provider

This PR adds Momento as a standard caching provider. Implements the
interface, adds integration tests, and documentation. We also add
Momento as a chat history message provider along with integration tests,
and documentation.

[Momento](https://www.gomomento.com/) is a fully serverless cache.
Similar to S3 or DynamoDB, it requires zero configuration,
infrastructure management, and is instantly available. Users sign up for
free and get 50GB of data in/out for free every month.

## Before submitting

 We have added documentation, notebooks, and integration tests
demonstrating usage.

Co-authored-by: Dev 2049 <dev.dev2049@gmail.com>
2023-05-25 19:13:21 -07:00

71 lines
2.2 KiB
Python

"""Test Momento chat message history functionality.
To run tests, set the environment variable MOMENTO_AUTH_TOKEN to a valid
Momento auth token. This can be obtained by signing up for a free
Momento account at https://gomomento.com/.
"""
import json
import uuid
from datetime import timedelta
from typing import Iterator
import pytest
from momento import CacheClient, Configurations, CredentialProvider
from langchain.memory import ConversationBufferMemory
from langchain.memory.chat_message_histories import MomentoChatMessageHistory
from langchain.schema import _message_to_dict
def random_string() -> str:
return str(uuid.uuid4())
@pytest.fixture(scope="function")
def message_history() -> Iterator[MomentoChatMessageHistory]:
cache_name = f"langchain-test-cache-{random_string()}"
client = CacheClient(
Configurations.Laptop.v1(),
CredentialProvider.from_environment_variable("MOMENTO_AUTH_TOKEN"),
default_ttl=timedelta(seconds=30),
)
try:
chat_message_history = MomentoChatMessageHistory(
session_id="my-test-session",
cache_client=client,
cache_name=cache_name,
)
yield chat_message_history
finally:
client.delete_cache(cache_name)
def test_memory_empty_on_new_session(
message_history: MomentoChatMessageHistory,
) -> None:
memory = ConversationBufferMemory(
memory_key="foo", chat_memory=message_history, return_messages=True
)
assert memory.chat_memory.messages == []
def test_memory_with_message_store(message_history: MomentoChatMessageHistory) -> None:
memory = ConversationBufferMemory(
memory_key="baz", chat_memory=message_history, return_messages=True
)
# Add some messages to the memory store
memory.chat_memory.add_ai_message("This is me, the AI")
memory.chat_memory.add_user_message("This is me, the human")
# Verify that the messages are in the store
messages = memory.chat_memory.messages
messages_json = json.dumps([_message_to_dict(msg) for msg in messages])
assert "This is me, the AI" in messages_json
assert "This is me, the human" in messages_json
# Verify clearing the store
memory.chat_memory.clear()
assert memory.chat_memory.messages == []