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286 lines
8.6 KiB
286 lines
8.6 KiB
3 years ago
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import collections
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import subprocess
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import warnings
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from . import protocols
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from . import transports
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from .log import logger
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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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waiter=None, extra=None, **kwargs):
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super().__init__(extra)
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self._closed = False
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self._protocol = protocol
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self._loop = loop
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self._proc = None
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self._pid = None
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self._returncode = None
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self._exit_waiters = []
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self._pending_calls = collections.deque()
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self._pipes = {}
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self._finished = False
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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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# Create the child process: set the _proc attribute
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try:
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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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except:
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self.close()
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raise
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self._pid = self._proc.pid
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self._extra['subprocess'] = self._proc
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if self._loop.get_debug():
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if isinstance(args, (bytes, str)):
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program = args
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else:
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program = args[0]
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logger.debug('process %r created: pid %s',
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program, self._pid)
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self._loop.create_task(self._connect_pipes(waiter))
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def __repr__(self):
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info = [self.__class__.__name__]
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if self._closed:
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info.append('closed')
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if self._pid is not None:
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info.append(f'pid={self._pid}')
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if self._returncode is not None:
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info.append(f'returncode={self._returncode}')
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elif self._pid is not None:
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info.append('running')
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else:
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info.append('not started')
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stdin = self._pipes.get(0)
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if stdin is not None:
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info.append(f'stdin={stdin.pipe}')
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stdout = self._pipes.get(1)
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stderr = self._pipes.get(2)
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if stdout is not None and stderr is stdout:
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info.append(f'stdout=stderr={stdout.pipe}')
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else:
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if stdout is not None:
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info.append(f'stdout={stdout.pipe}')
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if stderr is not None:
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info.append(f'stderr={stderr.pipe}')
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return '<{}>'.format(' '.join(info))
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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 set_protocol(self, protocol):
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self._protocol = protocol
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def get_protocol(self):
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return self._protocol
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def is_closing(self):
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return self._closed
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def close(self):
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if self._closed:
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return
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self._closed = True
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for proto in self._pipes.values():
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if proto is None:
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continue
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proto.pipe.close()
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if (self._proc is not None and
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# has the child process finished?
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self._returncode is None and
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# the child process has finished, but the
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# transport hasn't been notified yet?
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self._proc.poll() is None):
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if self._loop.get_debug():
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logger.warning('Close running child process: kill %r', self)
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try:
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self._proc.kill()
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except ProcessLookupError:
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pass
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# Don't clear the _proc reference yet: _post_init() may still run
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def __del__(self, _warn=warnings.warn):
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if not self._closed:
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_warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
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self.close()
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def get_pid(self):
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return self._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 _check_proc(self):
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if self._proc is None:
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raise ProcessLookupError()
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def send_signal(self, signal):
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self._check_proc()
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self._proc.send_signal(signal)
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def terminate(self):
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self._check_proc()
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self._proc.terminate()
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def kill(self):
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self._check_proc()
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self._proc.kill()
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async def _connect_pipes(self, waiter):
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try:
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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 = await 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 = await 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 = await 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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loop.call_soon(self._protocol.connection_made, self)
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for callback, data in self._pending_calls:
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loop.call_soon(callback, *data)
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self._pending_calls = None
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except (SystemExit, KeyboardInterrupt):
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raise
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except BaseException as exc:
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if waiter is not None and not waiter.cancelled():
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waiter.set_exception(exc)
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else:
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if waiter is not None and not waiter.cancelled():
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waiter.set_result(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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if self._loop.get_debug():
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logger.info('%r exited with return code %r', self, returncode)
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self._returncode = returncode
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if self._proc.returncode is None:
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# asyncio uses a child watcher: copy the status into the Popen
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# object. On Python 3.6, it is required to avoid a ResourceWarning.
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self._proc.returncode = returncode
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self._call(self._protocol.process_exited)
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self._try_finish()
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# wake up futures waiting for wait()
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for waiter in self._exit_waiters:
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if not waiter.cancelled():
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waiter.set_result(returncode)
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self._exit_waiters = None
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async def _wait(self):
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"""Wait until the process exit and return the process return code.
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This method is a coroutine."""
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if self._returncode is not None:
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return self._returncode
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waiter = self._loop.create_future()
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self._exit_waiters.append(waiter)
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return await waiter
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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._call(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._loop = None
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self._proc = None
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self._protocol = 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 __repr__(self):
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return f'<{self.__class__.__name__} fd={self.fd} pipe={self.pipe!r}>'
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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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self.proc = None
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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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