forked from M-Labs/artiq
protocols/pipe_ipc: Windows support
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@ -3,6 +3,9 @@ import asyncio
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from asyncio.streams import FlowControlMixin
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__all__ = ["AsyncioParentComm", "AsyncioChildComm", "ChildComm"]
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class _BaseIO:
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def write(self, data):
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self.writer.write(data)
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@ -92,10 +95,78 @@ if os.name != "nt":
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else: # windows
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class AsyncioParentComm(_BaseIO):
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import itertools
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_pipe_count = itertools.count()
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class AsyncioParentComm:
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"""Requires ProactorEventLoop"""
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def __init__(self):
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# We cannot use anonymous pipes on Windows, because we do not know
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# in advance if the child process wants a handle open in overlapped
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# mode or not.
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self.address = "\\\\.\\pipe\\artiq-{}-{}".format(os.getpid(),
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next(_pipe_count))
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self.server = None
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self.ready = asyncio.Event()
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self.write_buffer = b""
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def get_address(self):
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return self.address
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async def _autoclose(self):
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await self.process.wait()
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self.writer.close()
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if self.server is not None:
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self.server[0].close()
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self.server = None
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if self.ready.is_set():
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self.writer.close()
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async def create_subprocess(self, *args, **kwargs):
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loop = asyncio.get_event_loop()
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def factory():
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reader = asyncio.StreamReader(loop=loop)
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protocol = asyncio.StreamReaderProtocol(reader,
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self._child_connected,
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loop=loop)
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return protocol
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self.server = await loop.start_serving_pipe(
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factory, self.address)
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self.process = await asyncio.create_subprocess_exec(
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*args, **kwargs)
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asyncio.ensure_future(self._autoclose())
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def _child_connected(self, reader, writer):
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self.server[0].close()
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self.server = None
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self.reader = reader
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self.writer = writer
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if self.write_buffer:
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self.writer.write(self.write_buffer)
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self.write_buffer = b""
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self.ready.set()
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def write(self, data):
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if self.ready.is_set():
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self.writer.write(data)
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else:
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self.write_buffer += data
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async def drain(self):
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await self.ready.wait()
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await self.writer.drain()
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async def readline(self):
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await self.ready.wait()
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return await self.reader.readline()
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async def read(self, n):
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await self.ready.wait()
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return await self.reader.read(n)
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class AsyncioChildComm(_BaseIO):
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@ -109,9 +180,26 @@ else: # windows
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reader_protocol = asyncio.StreamReaderProtocol(
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self.reader, loop=loop)
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transport, _ = await loop.create_pipe_connection(
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self.address, lambda: reader_protocol)
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lambda: reader_protocol, self.address)
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self.writer = asyncio.StreamWriter(transport, reader_protocol,
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self.reader, loop)
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def close(self):
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self.writer.close()
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class ChildComm:
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pass
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def __init__(self, address):
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self.f = open(address, "a+b", 0)
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def read(self, n):
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return self.f.read(n)
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def readline(self):
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return self.f.readline()
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def write(self, data):
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return self.f.write(data)
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def close(self):
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self.f.close()
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