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Fix a race condition with DataChannel #421

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Fix a race condition with DataChannel #421

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34f2c77
Update utils.py
gtherond Jan 7, 2026
9dd67af
Fix issue with indent.
gtherond Jan 16, 2026
bf85393
Merge branch 'gradio-app:main' into fix/DataChannel
gtherond Jan 28, 2026
b2f37c7
Add readyState to DataChannel protocol to fix Pyright lint error
gtherond Feb 13, 2026
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4 changes: 3 additions & 1 deletion backend/fastrtc/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,9 @@ async def player_worker_decode(
and channel()
):
set_additional_outputs(outputs)
cast(DataChannel, channel()).send(create_message("fetch_output", []))
dc = cast(DataChannel, channel())
if dc.readyState == "open":
dc.send(create_message("fetch_output", []))

if frame is None:
if isinstance(outputs, CloseStream):
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