160 lines
4.7 KiB
Python
160 lines
4.7 KiB
Python
import collections
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import subprocess
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from . import protocols
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from . import tasks
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from . import transports
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class BaseSubprocessTransport(transports.SubprocessTransport):
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def __init__(self, loop, protocol, args, shell,
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stdin, stdout, stderr, bufsize,
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extra=None, **kwargs):
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super().__init__(extra)
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self._protocol = protocol
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self._loop = loop
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self._pipes = {}
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if stdin == subprocess.PIPE:
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self._pipes[0] = None
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if stdout == subprocess.PIPE:
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self._pipes[1] = None
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if stderr == subprocess.PIPE:
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self._pipes[2] = None
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self._pending_calls = collections.deque()
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self._finished = False
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self._returncode = None
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self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
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stderr=stderr, bufsize=bufsize, **kwargs)
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self._extra['subprocess'] = self._proc
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def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs):
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raise NotImplementedError
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def _make_write_subprocess_pipe_proto(self, fd):
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raise NotImplementedError
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def _make_read_subprocess_pipe_proto(self, fd):
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raise NotImplementedError
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def close(self):
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for proto in self._pipes.values():
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proto.pipe.close()
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if self._returncode is None:
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self.terminate()
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def get_pid(self):
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return self._proc.pid
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def get_returncode(self):
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return self._returncode
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def get_pipe_transport(self, fd):
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if fd in self._pipes:
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return self._pipes[fd].pipe
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else:
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return None
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def send_signal(self, signal):
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self._proc.send_signal(signal)
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def terminate(self):
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self._proc.terminate()
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def kill(self):
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self._proc.kill()
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@tasks.coroutine
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def _post_init(self):
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proc = self._proc
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loop = self._loop
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if proc.stdin is not None:
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_, pipe = yield from loop.connect_write_pipe(
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lambda: WriteSubprocessPipeProto(self, 0),
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proc.stdin)
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self._pipes[0] = pipe
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if proc.stdout is not None:
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_, pipe = yield from loop.connect_read_pipe(
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lambda: ReadSubprocessPipeProto(self, 1),
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proc.stdout)
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self._pipes[1] = pipe
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if proc.stderr is not None:
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_, pipe = yield from loop.connect_read_pipe(
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lambda: ReadSubprocessPipeProto(self, 2),
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proc.stderr)
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self._pipes[2] = pipe
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assert self._pending_calls is not None
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self._loop.call_soon(self._protocol.connection_made, self)
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for callback, data in self._pending_calls:
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self._loop.call_soon(callback, *data)
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self._pending_calls = None
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def _call(self, cb, *data):
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if self._pending_calls is not None:
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self._pending_calls.append((cb, data))
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else:
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self._loop.call_soon(cb, *data)
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def _pipe_connection_lost(self, fd, exc):
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self._call(self._protocol.pipe_connection_lost, fd, exc)
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self._try_finish()
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def _pipe_data_received(self, fd, data):
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self._call(self._protocol.pipe_data_received, fd, data)
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def _process_exited(self, returncode):
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assert returncode is not None, returncode
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assert self._returncode is None, self._returncode
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self._returncode = returncode
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self._call(self._protocol.process_exited)
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self._try_finish()
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def _try_finish(self):
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assert not self._finished
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if self._returncode is None:
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return
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if all(p is not None and p.disconnected
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for p in self._pipes.values()):
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self._finished = True
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self._loop.call_soon(self._call_connection_lost, None)
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def _call_connection_lost(self, exc):
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try:
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self._protocol.connection_lost(exc)
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finally:
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self._proc = None
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self._protocol = None
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self._loop = None
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class WriteSubprocessPipeProto(protocols.BaseProtocol):
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def __init__(self, proc, fd):
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self.proc = proc
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self.fd = fd
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self.pipe = None
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self.disconnected = False
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def connection_made(self, transport):
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self.pipe = transport
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def connection_lost(self, exc):
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self.disconnected = True
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self.proc._pipe_connection_lost(self.fd, exc)
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def pause_writing(self):
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self.proc._protocol.pause_writing()
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def resume_writing(self):
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self.proc._protocol.resume_writing()
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class ReadSubprocessPipeProto(WriteSubprocessPipeProto,
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protocols.Protocol):
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def data_received(self, data):
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self.proc._pipe_data_received(self.fd, data)
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