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import collections
import subprocess
from . import protocols
from . import transports
from .coroutines import coroutine
from .log import logger
class BaseSubprocessTransport(transports.SubprocessTransport):
def __init__(self, loop, protocol, args, shell,
stdin, stdout, stderr, bufsize,
extra=None, **kwargs):
super().__init__(extra)
self._protocol = protocol
self._loop = loop
self._pid = None
self._pipes = {}
if stdin == subprocess.PIPE:
self._pipes[0] = None
if stdout == subprocess.PIPE:
self._pipes[1] = None
if stderr == subprocess.PIPE:
self._pipes[2] = None
self._pending_calls = collections.deque()
self._finished = False
self._returncode = None
self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
stderr=stderr, bufsize=bufsize, **kwargs)
self._pid = self._proc.pid
self._extra['subprocess'] = self._proc
if self._loop.get_debug():
if isinstance(args, (bytes, str)):
program = args
else:
program = args[0]
logger.debug('process %r created: pid %s',
program, self._pid)
def __repr__(self):
info = [self.__class__.__name__, 'pid=%s' % self._pid]
if self._returncode is not None:
info.append('returncode=%s' % self._returncode)
stdin = self._pipes.get(0)
if stdin is not None:
info.append('stdin=%s' % stdin.pipe)
stdout = self._pipes.get(1)
stderr = self._pipes.get(2)
if stdout is not None and stderr is stdout:
info.append('stdout=stderr=%s' % stdout.pipe)
else:
if stdout is not None:
info.append('stdout=%s' % stdout.pipe)
if stderr is not None:
info.append('stderr=%s' % stderr.pipe)
return '<%s>' % ' '.join(info)
def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs):
raise NotImplementedError
def _make_write_subprocess_pipe_proto(self, fd):
raise NotImplementedError
def _make_read_subprocess_pipe_proto(self, fd):
raise NotImplementedError
def close(self):
for proto in self._pipes.values():
if proto is None:
continue
proto.pipe.close()
if self._returncode is None:
self.terminate()
def get_pid(self):
return self._pid
def get_returncode(self):
return self._returncode
def get_pipe_transport(self, fd):
if fd in self._pipes:
return self._pipes[fd].pipe
else:
return None
def send_signal(self, signal):
self._proc.send_signal(signal)
def terminate(self):
self._proc.terminate()
def kill(self):
self._proc.kill()
def _kill_wait(self):
"""Close pipes, kill the subprocess and read its return status.
Function called when an exception is raised during the creation
of a subprocess.
"""
if self._loop.get_debug():
logger.warning('Exception during subprocess creation, '
'kill the subprocess %r',
self,
exc_info=True)
proc = self._proc
if proc.stdout:
proc.stdout.close()
if proc.stderr:
proc.stderr.close()
if proc.stdin:
proc.stdin.close()
try:
proc.kill()
except ProcessLookupError:
pass
self._returncode = proc.wait()
self.close()
@coroutine
def _post_init(self):
try:
proc = self._proc
loop = self._loop
if proc.stdin is not None:
_, pipe = yield from loop.connect_write_pipe(
lambda: WriteSubprocessPipeProto(self, 0),
proc.stdin)
self._pipes[0] = pipe
if proc.stdout is not None:
_, pipe = yield from loop.connect_read_pipe(
lambda: ReadSubprocessPipeProto(self, 1),
proc.stdout)
self._pipes[1] = pipe
if proc.stderr is not None:
_, pipe = yield from loop.connect_read_pipe(
lambda: ReadSubprocessPipeProto(self, 2),
proc.stderr)
self._pipes[2] = pipe
assert self._pending_calls is not None
self._loop.call_soon(self._protocol.connection_made, self)
for callback, data in self._pending_calls:
self._loop.call_soon(callback, *data)
self._pending_calls = None
except:
self._kill_wait()
raise
def _call(self, cb, *data):
if self._pending_calls is not None:
self._pending_calls.append((cb, data))
else:
self._loop.call_soon(cb, *data)
def _pipe_connection_lost(self, fd, exc):
self._call(self._protocol.pipe_connection_lost, fd, exc)
self._try_finish()
def _pipe_data_received(self, fd, data):
self._call(self._protocol.pipe_data_received, fd, data)
def _process_exited(self, returncode):
assert returncode is not None, returncode
assert self._returncode is None, self._returncode
if self._loop.get_debug():
logger.info('%r exited with return code %r',
self, returncode)
self._returncode = returncode
self._call(self._protocol.process_exited)
self._try_finish()
def _try_finish(self):
assert not self._finished
if self._returncode is None:
return
if all(p is not None and p.disconnected
for p in self._pipes.values()):
self._finished = True
self._call(self._call_connection_lost, None)
def _call_connection_lost(self, exc):
try:
self._protocol.connection_lost(exc)
finally:
self._proc = None
self._protocol = None
self._loop = None
class WriteSubprocessPipeProto(protocols.BaseProtocol):
def __init__(self, proc, fd):
self.proc = proc
self.fd = fd
self.pipe = None
self.disconnected = False
def connection_made(self, transport):
self.pipe = transport
def __repr__(self):
return ('<%s fd=%s pipe=%r>'
% (self.__class__.__name__, self.fd, self.pipe))
def connection_lost(self, exc):
self.disconnected = True
self.proc._pipe_connection_lost(self.fd, exc)
self.proc = None
def pause_writing(self):
self.proc._protocol.pause_writing()
def resume_writing(self):
self.proc._protocol.resume_writing()
class ReadSubprocessPipeProto(WriteSubprocessPipeProto,
protocols.Protocol):
def data_received(self, data):
self.proc._pipe_data_received(self.fd, data)
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