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Merge 6240dc105a into 0127069d47

This commit is contained in:
Charis Nikolaidis 2026-03-16 10:21:04 +00:00 committed by GitHub
parent 0127069d47 6240dc105a
commit 3ebace66a5
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1 changed files with 11 additions and 7 deletions
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18
fastapi/routing.py
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@ -4,6 +4,7 @@ import functools
import inspect
import json
import types
import weakref
from collections.abc import (
AsyncIterator,
Awaitable,
@ -247,16 +248,19 @@ class _DefaultLifespan:
return self
# Cache for endpoint context to avoid re-extracting on every request
_endpoint_context_cache: dict[int, EndpointContext] = {}
# Cache for endpoint context to avoid re-extracting on every request.
# Uses WeakKeyDictionary so entries are automatically evicted when the endpoint
# function is garbage collected (e.g., when a dynamically created FastAPI app is
# destroyed), preventing both memory leaks and stale-ID lookups.
_endpoint_context_cache: weakref.WeakKeyDictionary[
Callable[..., Any], EndpointContext
] = weakref.WeakKeyDictionary()
def _extract_endpoint_context(func: Any) -> EndpointContext:
"""Extract endpoint context with caching to avoid repeated file I/O."""
func_id = id(func)
if func_id in _endpoint_context_cache:
return _endpoint_context_cache[func_id]
if func in _endpoint_context_cache:
return _endpoint_context_cache[func]
try:
ctx: EndpointContext = {}
@ -270,7 +274,7 @@ def _extract_endpoint_context(func: Any) -> EndpointContext:
except Exception:
ctx = EndpointContext()
_endpoint_context_cache[func_id] = ctx
_endpoint_context_cache[func] = ctx
return ctx