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subprocess.py
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__all__ = 'create_subprocess_exec', 'create_subprocess_shell' import subprocess from . import events from . import protocols from . import streams from . import tasks from .log import logger PIPE = subprocess.PIPE STDOUT = subprocess.STDOUT DEVNULL = subprocess.DEVNULL class SubprocessStreamProtocol(streams.FlowControlMixin, protocols.SubprocessProtocol): """Like StreamReaderProtocol, but for a subprocess.""" def __init__(self, limit, loop): super().__init__(loop=loop) self._limit = limit self.stdin = self.stdout = self.stderr = None self._transport = None self._process_exited = False self._pipe_fds = [] self._stdin_closed = self._loop.create_future() def __repr__(self): info = [self.__class__.__name__] if self.stdin is not None: info.append(f'stdin={self.stdin!r}') if self.stdout is not None: info.append(f'stdout={self.stdout!r}') if self.stderr is not None: info.append(f'stderr={self.stderr!r}') return '<{}>'.format(' '.join(info)) def connection_made(self, transport): self._transport = transport stdout_transport = transport.get_pipe_transport(1) if stdout_transport is not None: self.stdout = streams.StreamReader(limit=self._limit, loop=self._loop) self.stdout.set_transport(stdout_transport) self._pipe_fds.append(1) stderr_transport = transport.get_pipe_transport(2) if stderr_transport is not None: self.stderr = streams.StreamReader(limit=self._limit, loop=self._loop) self.stderr.set_transport(stderr_transport) self._pipe_fds.append(2) stdin_transport = transport.get_pipe_transport(0) if stdin_transport is not None: self.stdin = streams.StreamWriter(stdin_transport, protocol=self, reader=None, loop=self._loop) def pipe_data_received(self, fd, data): if fd == 1: reader = self.stdout elif fd == 2: reader = self.stderr else: reader = None if reader is not None: reader.feed_data(data) def pipe_connection_lost(self, fd, exc): if fd == 0: pipe = self.stdin if pipe is not None: pipe.close() self.connection_lost(exc) if exc is None: self._stdin_closed.set_result(None) else: self._stdin_closed.set_exception(exc) # Since calling `wait_closed()` is not mandatory, # we shouldn't log the traceback if this is not awaited. self._stdin_closed._log_traceback = False return if fd == 1: reader = self.stdout elif fd == 2: reader = self.stderr else: reader = None if reader is not None: if exc is None: reader.feed_eof() else: reader.set_exception(exc) if fd in self._pipe_fds: self._pipe_fds.remove(fd) self._maybe_close_transport() def process_exited(self): self._process_exited = True self._maybe_close_transport() def _maybe_close_transport(self): if len(self._pipe_fds) == 0 and self._process_exited: self._transport.close() self._transport = None def _get_close_waiter(self, stream): if stream is self.stdin: return self._stdin_closed class Process: def __init__(self, transport, protocol, loop): self._transport = transport self._protocol = protocol self._loop = loop self.stdin = protocol.stdin self.stdout = protocol.stdout self.stderr = protocol.stderr self.pid = transport.get_pid() def __repr__(self): return f'<{self.__class__.__name__} {self.pid}>' @property def returncode(self): return self._transport.get_returncode() async def wait(self): """Wait until the process exit and return the process return code.""" return await self._transport._wait() def send_signal(self, signal): self._transport.send_signal(signal) def terminate(self): self._transport.terminate() def kill(self): self._transport.kill() async def _feed_stdin(self, input): debug = self._loop.get_debug() try: if input is not None: self.stdin.write(input) if debug: logger.debug( '%r communicate: feed stdin (%s bytes)', self, len(input)) await self.stdin.drain() except (BrokenPipeError, ConnectionResetError) as exc: # communicate() ignores BrokenPipeError and ConnectionResetError. # write() and drain() can raise these exceptions. if debug: logger.debug('%r communicate: stdin got %r', self, exc) if debug: logger.debug('%r communicate: close stdin', self) self.stdin.close() async def _noop(self): return None async def _read_stream(self, fd): transport = self._transport.get_pipe_transport(fd) if fd == 2: stream = self.stderr else: assert fd == 1 stream = self.stdout if self._loop.get_debug(): name = 'stdout' if fd == 1 else 'stderr' logger.debug('%r communicate: read %s', self, name) output = await stream.read() if self._loop.get_debug(): name = 'stdout' if fd == 1 else 'stderr' logger.debug('%r communicate: close %s', self, name) transport.close() return output async def communicate(self, input=None): if self.stdin is not None: stdin = self._feed_stdin(input) else: stdin = self._noop() if self.stdout is not None: stdout = self._read_stream(1) else: stdout = self._noop() if self.stderr is not None: stderr = self._read_stream(2) else: stderr = self._noop() stdin, stdout, stderr = await tasks.gather(stdin, stdout, stderr) await self.wait() return (stdout, stderr) async def create_subprocess_shell(cmd, stdin=None, stdout=None, stderr=None, limit=streams._DEFAULT_LIMIT, **kwds): loop = events.get_running_loop() protocol_factory = lambda: SubprocessStreamProtocol(limit=limit, loop=loop) transport, protocol = await loop.subprocess_shell( protocol_factory, cmd, stdin=stdin, stdout=stdout, stderr=stderr, **kwds) return Process(transport, protocol, loop) async def create_subprocess_exec(program, *args, stdin=None, stdout=None, stderr=None, limit=streams._DEFAULT_LIMIT, **kwds): loop = events.get_running_loop() protocol_factory = lambda: SubprocessStreamProtocol(limit=limit, loop=loop) transport, protocol = await loop.subprocess_exec( protocol_factory, program, *args, stdin=stdin, stdout=stdout, stderr=stderr, **kwds) return Process(transport, protocol, loop)