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Editing File: /usr/lib64/python3.6/asyncio/base_subprocess.py

import collections
import subprocess
import warnings

from . import compat
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,
                 waiter=None, extra=None, **kwargs):
        super().__init__(extra)
        self._closed = False
        self._protocol = protocol
        self._loop = loop
        self._proc = None
        self._pid = None
        self._returncode = None
        self._exit_waiters = []
        self._pending_calls = collections.deque()
        self._pipes = {}
        self._finished = False

if stdin == subprocess.PIPE:
            self._pipes[0] = None
        if stdout == subprocess.PIPE:
            self._pipes[1] = None
        if stderr == subprocess.PIPE:
            self._pipes[2] = None

# Create the child process: set the _proc attribute
        try:
            self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
                        stderr=stderr, bufsize=bufsize, **kwargs)
        except:
            self.close()
            raise

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)

self._loop.create_task(self._connect_pipes(waiter))

def __repr__(self):
        info = [self.__class__.__name__]
        if self._closed:
            info.append('closed')
        if self._pid is not None:
            info.append('pid=%s' % self._pid)
        if self._returncode is not None:
            info.append('returncode=%s' % self._returncode)
        elif self._pid is not None:
            info.append('running')
        else:
            info.append('not started')

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 set_protocol(self, protocol):
        self._protocol = protocol

def get_protocol(self):
        return self._protocol

def is_closing(self):
        return self._closed

def close(self):
        if self._closed:
            return
        self._closed = True

for proto in self._pipes.values():
            if proto is None:
                continue
            proto.pipe.close()

if (self._proc is not None
        # the child process finished?
        and self._returncode is None
        # the child process finished but the transport was not notified yet?
        and self._proc.poll() is None
        ):
            if self._loop.get_debug():
                logger.warning('Close running child process: kill %r', self)

try:
                self._proc.kill()
            except ProcessLookupError:
                pass

# Don't clear the _proc reference yet: _post_init() may still run

# On Python 3.3 and older, objects with a destructor part of a reference
    # cycle are never destroyed. It's not more the case on Python 3.4 thanks
    # to the PEP 442.
    if compat.PY34:
        def __del__(self):
            if not self._closed:
                warnings.warn("unclosed transport %r" % self, ResourceWarning,
                              source=self)
                self.close()

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 _check_proc(self):
        if self._proc is None:
            raise ProcessLookupError()

def send_signal(self, signal):
        self._check_proc()
        self._proc.send_signal(signal)

def terminate(self):
        self._check_proc()
        self._proc.terminate()

def kill(self):
        self._check_proc()
        self._proc.kill()

@coroutine
    def _connect_pipes(self, waiter):
        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

loop.call_soon(self._protocol.connection_made, self)
            for callback, data in self._pending_calls:
                loop.call_soon(callback, *data)
            self._pending_calls = None
        except Exception as exc:
            if waiter is not None and not waiter.cancelled():
                waiter.set_exception(exc)
        else:
            if waiter is not None and not waiter.cancelled():
                waiter.set_result(None)

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
        if self._proc.returncode is None:
            # asyncio uses a child watcher: copy the status into the Popen
            # object. On Python 3.6, it is required to avoid a ResourceWarning.
            self._proc.returncode = returncode
        self._call(self._protocol.process_exited)
        self._try_finish()

# wake up futures waiting for wait()
        for waiter in self._exit_waiters:
            if not waiter.cancelled():
                waiter.set_result(returncode)
        self._exit_waiters = None

@coroutine
    def _wait(self):
        """Wait until the process exit and return the process return code.

This method is a coroutine."""
        if self._returncode is not None:
            return self._returncode

waiter = self._loop.create_future()
        self._exit_waiters.append(waiter)
        return (yield from waiter)

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._loop = None
            self._proc = None
            self._protocol = 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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