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langchain - ✅(Solved) Fix core, openai: asyncio.get_event_loop() deprecated in async contexts [1 pull requests, 2 comments, 3 participants]

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langchain-ai/langchain#35726•Fetched 2026-04-08 00:24:54
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Participants
3
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Author
alvinttangalvinttang
Participants
alvinttangalvinttangJiwaniZakirJiwaniZakirrajfirkerajfirke
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Fix Action

Fixed

PR fix notes

PR #35729: fix(core,openai): replace deprecated asyncio.get_event_loop() in async contexts

Description (problem / solution / changelog)

Fixes #35726

Replace asyncio.get_event_loop() with asyncio.get_running_loop() in async function contexts. get_event_loop() is deprecated since Python 3.10 and can fail when no event loop exists. Inside async def, get_running_loop() is the correct and guaranteed-safe replacement.

Changed files

  • libs/core/langchain_core/callbacks/manager.py — _ahandle_event_for_handler()
  • libs/core/langchain_core/runnables/graph_mermaid.py — _render_mermaid_using_pyppeteer()
  • libs/partners/openai/langchain_openai/chat_models/_client_utils.py — async_api_key_wrapper()

No behavior change when called from a running event loop.

Changed files

  • libs/core/langchain_core/callbacks/manager.py (modified, +1/-1)
  • libs/core/langchain_core/runnables/graph_mermaid.py (modified, +1/-1)
  • libs/partners/openai/langchain_openai/chat_models/_client_utils.py (modified, +1/-1)
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Description

Several async functions use asyncio.get_event_loop() which has been deprecated since Python 3.10. Inside async def, asyncio.get_running_loop() is the correct replacement — it's guaranteed to work and won't trigger deprecation warnings.

Affected files

  • libs/core/langchain_core/callbacks/manager.py — _ahandle_event_for_handler()
  • libs/core/langchain_core/runnables/graph_mermaid.py — _render_mermaid_using_pyppeteer()
  • libs/partners/openai/langchain_openai/chat_models/_client_utils.py — async_api_key_wrapper()

Suggested fix Replace asyncio.get_event_loop() with asyncio.get_running_loop() in these async contexts. No behavior change when called from a running event loop.

extent analysis

Problem Summary

Deprecation of asyncio.get_event_loop() in Python 3.10

Root Cause Analysis

The use of asyncio.get_event_loop() in async functions is deprecated since Python 3.10.

Fix Plan

Replace asyncio.get_event_loop() with asyncio.get_running_loop() in the affected files.

Step-by-Step Fix

File: libs/core/langchain_core/callbacks/manager.py

# Before
async def _handle_event_for_handler(self, event):
    loop = asyncio.get_event_loop()
    # ...

# After
async def _handle_event_for_handler(self, event):
    loop = asyncio.get_running_loop()
    # ...

File: libs/core/langchain_core/runnables/graph_mermaid.py

# Before
async def _render_mermaid_using_pyppeteer(self):
    loop = asyncio.get_event_loop()
    # ...

# After
async def _render_mermaid_using_pyppeteer(self):
    loop = asyncio.get_running_loop()
    # ...

File: libs/partners/openai/langchain_openai/chat_models/_client_utils.py

# Before
async def async_api_key_wrapper(self, api_key):
    loop = asyncio.get_event_loop()
    # ...

# After
async def async_api_key_wrapper(self, api_key):
    loop = asyncio.get_running_loop()
    # ...

Verification

Verify that the code compiles without deprecation warnings and runs as expected.

Extra Tips

  • Make sure to update all occurrences of asyncio.get_event_loop() in the affected files.
  • Consider running a linter or code analysis tool to catch similar deprecation warnings.

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