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# 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>
95 lines
2.9 KiB
Python
95 lines
2.9 KiB
Python
"""Test Momento cache functionality.
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To run tests, set the environment variable MOMENTO_AUTH_TOKEN to a valid
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Momento auth token. This can be obtained by signing up for a free
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Momento account at https://gomomento.com/.
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"""
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from __future__ import annotations
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import uuid
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from datetime import timedelta
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from typing import Iterator
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import pytest
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from momento import CacheClient, Configurations, CredentialProvider
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import langchain
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from langchain.cache import MomentoCache
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from langchain.schema import Generation, LLMResult
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from tests.unit_tests.llms.fake_llm import FakeLLM
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def random_string() -> str:
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return str(uuid.uuid4())
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@pytest.fixture(scope="module")
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def momento_cache() -> Iterator[MomentoCache]:
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cache_name = f"langchain-test-cache-{random_string()}"
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client = CacheClient(
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Configurations.Laptop.v1(),
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CredentialProvider.from_environment_variable("MOMENTO_AUTH_TOKEN"),
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default_ttl=timedelta(seconds=30),
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)
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try:
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llm_cache = MomentoCache(client, cache_name)
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langchain.llm_cache = llm_cache
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yield llm_cache
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finally:
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client.delete_cache(cache_name)
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def test_invalid_ttl() -> None:
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client = CacheClient(
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Configurations.Laptop.v1(),
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CredentialProvider.from_environment_variable("MOMENTO_AUTH_TOKEN"),
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default_ttl=timedelta(seconds=30),
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)
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with pytest.raises(ValueError):
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MomentoCache(client, cache_name=random_string(), ttl=timedelta(seconds=-1))
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def test_momento_cache_miss(momento_cache: MomentoCache) -> None:
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llm = FakeLLM()
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stub_llm_output = LLMResult(generations=[[Generation(text="foo")]])
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assert llm.generate([random_string()]) == stub_llm_output
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@pytest.mark.parametrize(
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"prompts, generations",
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[
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# Single prompt, single generation
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([random_string()], [[random_string()]]),
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# Single prompt, multiple generations
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([random_string()], [[random_string(), random_string()]]),
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# Single prompt, multiple generations
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([random_string()], [[random_string(), random_string(), random_string()]]),
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# Multiple prompts, multiple generations
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(
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[random_string(), random_string()],
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[[random_string()], [random_string(), random_string()]],
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),
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],
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)
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def test_momento_cache_hit(
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momento_cache: MomentoCache, prompts: list[str], generations: list[list[str]]
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) -> None:
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llm = FakeLLM()
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params = llm.dict()
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params["stop"] = None
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llm_string = str(sorted([(k, v) for k, v in params.items()]))
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llm_generations = [
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[
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Generation(text=generation, generation_info=params)
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for generation in prompt_i_generations
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]
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for prompt_i_generations in generations
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]
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for prompt_i, llm_generations_i in zip(prompts, llm_generations):
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momento_cache.update(prompt_i, llm_string, llm_generations_i)
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assert llm.generate(prompts) == LLMResult(
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generations=llm_generations, llm_output={}
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)
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