langchain-ai/langchain

`langchain_chroma.Chroma` used with `chromadb.AsyncHttpClient`?

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#30,704 opened on Apr 7, 2025

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Description

Checked other resources

  • I added a very descriptive title to this issue.
  • I used the GitHub search to find a similar question and didn't find it.
  • I am sure that this is a bug in LangChain rather than my code.
  • The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
  • I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Example Code

self._client = chromadb.AsyncHttpClient(host=config.CHROMA_URI, port=80, headers={"X-Chroma-Token": config.CHROMA_TOKEN}, tenant=self._tenant, database=self._database)
self._vector_store = Chroma(client = self._client, collection_name = self._collection, embedding_function = self._embeddings)

Error Message and Stack Trace (if applicable)

    self._vector_store = Chroma(client = self._client, collection_name = self._collection, embedding_function = self._embeddings)        
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/khteh/.local/share/virtualenvs/rag-agent-YeW3dxEa/lib/python3.12/site-packages/langchain_chroma/vectorstores.py", line 342, in __init__
    self.__ensure_collection()
  File "/home/khteh/.local/share/virtualenvs/rag-agent-YeW3dxEa/lib/python3.12/site-packages/langchain_chroma/vectorstores.py", line 349, in __ensure_collection
    self._chroma_collection = self._client.get_or_create_collection(
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'coroutine' object has no attribute 'get_or_create_collection'

Description

I wan to use langchain_chroma.Chroma with chromadb.AsyncHttpClient

System Info

System Information
------------------
> OS:  Linux
> OS Version:  #21-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb 19 16:50:40 UTC 2025
> Python Version:  3.12.7 (main, Feb  4 2025, 14:46:03) [GCC 14.2.0]

Package Information
-------------------
> langchain_core: 0.3.49
> langchain: 0.3.22
> langchain_community: 0.3.20
> langsmith: 0.3.21
> langchain_chroma: 0.2.2
> langchain_cli: 0.0.36
> langchain_google_genai: 2.1.2
> langchain_google_vertexai: 2.0.18
> langchain_neo4j: 0.4.0
> langchain_ollama: 0.3.0
> langchain_openai: 0.3.11
> langchain_text_splitters: 0.3.7
> langgraph_sdk: 0.1.60
> langserve: 0.3.1

Other Dependencies
------------------
> aiohttp<4.0.0,>=3.8.3: Installed. No version info available.
> anthropic[vertexai]: Installed. No version info available.
> async-timeout<5.0.0,>=4.0.0;: Installed. No version info available.
> chromadb!=0.5.10,!=0.5.11,!=0.5.12,!=0.5.4,!=0.5.5,!=0.5.7,!=0.5.9,<0.7.0,>=0.4.0: Installed. No version info available.
> dataclasses-json<0.7,>=0.5.7: Installed. No version info available.
> fastapi: 0.115.12
> filetype: 1.2.0
> gitpython<4,>=3: Installed. No version info available.
> google-ai-generativelanguage: 0.6.17
> google-cloud-aiplatform: 1.87.0
> google-cloud-storage: 2.19.0
> gritql<1.0.0,>=0.2.0: Installed. No version info available.
> httpx: 0.27.2
> httpx-sse: 0.4.0
> httpx-sse<1.0.0,>=0.4.0: Installed. No version info available.
> jsonpatch<2.0,>=1.33: Installed. No version info available.
> langchain-anthropic;: Installed. No version info available.
> langchain-aws;: Installed. No version info available.
> langchain-azure-ai;: Installed. No version info available.
> langchain-cohere;: Installed. No version info available.
> langchain-community;: Installed. No version info available.
> langchain-core!=0.3.0,!=0.3.1,!=0.3.10,!=0.3.11,!=0.3.12,!=0.3.13,!=0.3.14,!=0.3.2,!=0.3.3,!=0.3.4,!=0.3.5,!=0.3.6,!=0.3.7,!=0.3.8,!=0.3.9,<0.4.0,>=0.2.43: Installed. No version info available.
> langchain-core<1.0.0,>=0.3.45: Installed. No version info available.
> langchain-core<1.0.0,>=0.3.47: Installed. No version info available.
> langchain-core<1.0.0,>=0.3.49: Installed. No version info available.
> langchain-deepseek;: Installed. No version info available.
> langchain-fireworks;: Installed. No version info available.
> langchain-google-genai;: Installed. No version info available.
> langchain-google-vertexai;: Installed. No version info available.
> langchain-groq;: Installed. No version info available.
> langchain-huggingface;: Installed. No version info available.
> langchain-mistralai: Installed. No version info available.
> langchain-mistralai;: Installed. No version info available.
> langchain-ollama;: Installed. No version info available.
> langchain-openai;: Installed. No version info available.
> langchain-text-splitters<1.0.0,>=0.3.7: Installed. No version info available.
> langchain-together;: Installed. No version info available.
> langchain-xai;: Installed. No version info available.
> langchain<1.0.0,>=0.3.21: Installed. No version info available.
> langserve[all]>=0.0.51: Installed. No version info available.
> langsmith-pyo3: Installed. No version info available.
> langsmith<0.4,>=0.1.125: Installed. No version info available.
> langsmith<0.4,>=0.1.17: Installed. No version info available.
> neo4j: 5.28.1
> neo4j-graphrag: 1.6.1
> numpy<2.0.0,>=1.22.4;: Installed. No version info available.
> numpy<2.0.0,>=1.26.2;: Installed. No version info available.
> numpy<3,>=1.26.2: Installed. No version info available.
> ollama<1,>=0.4.4: Installed. No version info available.
> openai-agents: Installed. No version info available.
> openai<2.0.0,>=1.68.2: Installed. No version info available.
> opentelemetry-api: 1.31.1
> opentelemetry-exporter-otlp-proto-http: Installed. No version info available.
> opentelemetry-sdk: 1.31.1
> orjson: 3.10.16
> packaging: 24.2
> packaging<25,>=23.2: Installed. No version info available.
> pydantic: 2.9.2
> pydantic-settings<3.0.0,>=2.4.0: Installed. No version info available.
> pydantic<3.0.0,>=2.5.2;: Installed. No version info available.
> pydantic<3.0.0,>=2.7.4: Installed. No version info available.
> pydantic<3.0.0,>=2.7.4;: Installed. No version info available.
> pytest: 8.3.5
> PyYAML>=5.3: Installed. No version info available.
> requests: 2.32.3
> requests-toolbelt: 1.0.0
> requests<3,>=2: Installed. No version info available.
> rich: 14.0.0
> SQLAlchemy<3,>=1.4: Installed. No version info available.
> sse-starlette: 1.8.2
> tenacity!=8.4.0,<10,>=8.1.0: Installed. No version info available.
> tenacity!=8.4.0,<10.0.0,>=8.1.0: Installed. No version info available.
> tiktoken<1,>=0.7: Installed. No version info available.
> tomlkit>=0.12: Installed. No version info available.
> typer[all]<1.0.0,>=0.9.0: Installed. No version info available.
> typing-extensions>=4.7: Installed. No version info available.
> uvicorn<1.0,>=0.23: Installed. No version info available.
> validators: 0.34.0
> zstandard: 0.23.0

Contributor guide

Research direction
Examine the `langchain chroma/vectorstores.py` file, specifically the `Chroma. init ` and ` ensure collection` methods. The issue is that `Chroma` expects a synchronous client, but `chromadb.AsyncHttpClient` returns a coroutine for its methods. Investigate how to integrate the async client, potentially by adding async variants of the Chroma class or by making the client sync compatible.
Tech stack
python
Domain
backendapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Pythonasync/await
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70