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Edit File : subprocess.py \| Size : 7.88 KB
__all__ = 'create_subprocess_exec', 'create_subprocess_shell' import subprocess import warnings 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) 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() self.stdin.write(input) if debug: logger.debug( '%r communicate: feed stdin (%s bytes)', self, len(input)) try: await self.stdin.drain() except (BrokenPipeError, ConnectionResetError) as exc: # communicate() ignores BrokenPipeError and ConnectionResetError 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 input 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, loop=self._loop) await self.wait() return (stdout, stderr) async def create_subprocess_shell(cmd, stdin=None, stdout=None, stderr=None, loop=None, limit=streams._DEFAULT_LIMIT, kwds): if loop is None: loop = events.get_event_loop() else: warnings.warn("The loop argument is deprecated since Python 3.8 " "and scheduled for removal in Python 3.10.", DeprecationWarning, stacklevel=2 ) 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, loop=None, limit=streams._DEFAULT_LIMIT, kwds): if loop is None: loop = events.get_event_loop() else: warnings.warn("The loop argument is deprecated since Python 3.8 " "and scheduled for removal in Python 3.10.", DeprecationWarning, stacklevel=2 ) 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) Back

Edit File : subprocess.py | Size : 7.88 KB

__all__ = 'create_subprocess_exec', 'create_subprocess_shell'

import subprocess
import warnings

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)
            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()
        self.stdin.write(input)
        if debug:
            logger.debug(
                '%r communicate: feed stdin (%s bytes)', self, len(input))
        try:
            await self.stdin.drain()
        except (BrokenPipeError, ConnectionResetError) as exc:
            # communicate() ignores BrokenPipeError and ConnectionResetError
            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 input 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,
                                                   loop=self._loop)
        await self.wait()
        return (stdout, stderr)

async def create_subprocess_shell(cmd, stdin=None, stdout=None, stderr=None,
                                  loop=None, limit=streams._DEFAULT_LIMIT,
                                  **kwds):
    if loop is None:
        loop = events.get_event_loop()
    else:
        warnings.warn("The loop argument is deprecated since Python 3.8 "
                      "and scheduled for removal in Python 3.10.",
                      DeprecationWarning,
                      stacklevel=2
        )

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, loop=None,
                                 limit=streams._DEFAULT_LIMIT, **kwds):
    if loop is None:
        loop = events.get_event_loop()
    else:
        warnings.warn("The loop argument is deprecated since Python 3.8 "
                      "and scheduled for removal in Python 3.10.",
                      DeprecationWarning,
                      stacklevel=2
        )
    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)

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