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fix: performance regression when sniffio not installed #1103

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fix: performance regression when sniffio not installed #1103

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11 changes: 7 additions & 4 deletions httpcore/_synchronization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,14 +18,17 @@
except ImportError: # pragma: nocover
anyio = None # type: ignore

try:
import sniffio
except ImportError: # pragma: nocover
sniffio = None # type: ignore


def current_async_library() -> str:
# Determine if we're running under trio or asyncio.
# See https://sniffio.readthedocs.io/en/latest/
try:
import sniffio
except ImportError: # pragma: nocover
environment = "asyncio"
if sniffio is None:
environment = "asyncio" # pragma: nocover
else:
environment = sniffio.current_async_library()

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