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04ad96e6cd
Strict pyright mode results in a lot of issues regarding non fully determined types, due to Generics. These are some issues I came across today. We are still far from being clean on pyright.
60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
import sys
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from contextlib import asynccontextmanager
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import anyio
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import anyio.lowlevel
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from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
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from mcp_python.types import JSONRPCMessage
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@asynccontextmanager
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async def stdio_server(
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stdin: anyio.AsyncFile[str] | None = None, stdout: anyio.AsyncFile[str] | None = None
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):
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"""
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Server transport for stdio: this communicates with an MCP client by reading from the current process' stdin and writing to stdout.
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"""
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# Purposely not using context managers for these, as we don't want to close standard process handles.
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if not stdin:
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stdin = anyio.wrap_file(sys.stdin)
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if not stdout:
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stdout = anyio.wrap_file(sys.stdout)
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read_stream: MemoryObjectReceiveStream[JSONRPCMessage | Exception]
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read_stream_writer: MemoryObjectSendStream[JSONRPCMessage | Exception]
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write_stream: MemoryObjectSendStream[JSONRPCMessage]
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write_stream_reader: MemoryObjectReceiveStream[JSONRPCMessage]
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read_stream_writer, read_stream = anyio.create_memory_object_stream(0)
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write_stream, write_stream_reader = anyio.create_memory_object_stream(0)
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async def stdin_reader():
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try:
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async with read_stream_writer:
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async for line in stdin:
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try:
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message = JSONRPCMessage.model_validate_json(line)
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except Exception as exc:
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await read_stream_writer.send(exc)
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continue
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await read_stream_writer.send(message)
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except anyio.ClosedResourceError:
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await anyio.lowlevel.checkpoint()
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async def stdout_writer():
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try:
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async with write_stream_reader:
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async for message in write_stream_reader:
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json = message.model_dump_json(by_alias=True, exclude_none=True)
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await stdout.write(json + "\n")
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await stdout.flush()
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except anyio.ClosedResourceError:
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await anyio.lowlevel.checkpoint()
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async with anyio.create_task_group() as tg:
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tg.start_soon(stdin_reader)
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tg.start_soon(stdout_writer)
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yield read_stream, write_stream
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