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handle BrokenResourceError gracefully #237

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handle BrokenResourceError gracefully #237

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17 changes: 14 additions & 3 deletions src/mcp/server/stdio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,16 +67,27 @@ async def stdin_reader():
continue

await read_stream_writer.send(message)
except anyio.BrokenResourceError as ex:
print(f"BrokenResourceError(reader): {ex}")
pass
except anyio.ClosedResourceError:
await anyio.lowlevel.checkpoint()
except Exception as ex:
print(f"read error: {ex}")

async def stdout_writer():
try:
async with write_stream_reader:
async for message in write_stream_reader:
json = message.model_dump_json(by_alias=True, exclude_none=True)
await stdout.write(json + "\n")
await stdout.flush()
try:
json = message.model_dump_json(by_alias=True, exclude_none=True)
await stdout.write(json + "\n")
await stdout.flush()
except Exception as ex:
print(f"problem with writer: {ex}")
except anyio.BrokenResourceError as ex:
print(f"BrokenResourceError(writer): {ex}")
pass
except anyio.ClosedResourceError:
await anyio.lowlevel.checkpoint()

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