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process.py
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process.py
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"""Process
This module implements a wrapper for basic ``subprocess.Popen`` functionality.
"""
from io import BytesIO
from subprocess import Popen, PIPE
from circuits.core.manager import TIMEOUT
from circuits import handler, BaseComponent
from .file import File
from .events import started, stopped, write
class Process(BaseComponent):
channel = "process"
def init(self, args, cwd=None, shell=False):
self.args = args
self.cwd = cwd
self.shell = shell
self.p = None
self.stderr = BytesIO()
self.stdout = BytesIO()
self._status = None
self._terminated = False
self._stdout_closed = False
self._stderr_closed = False
self._stdin = None
self._stderr = None
self._stdout = None
self._stdin_closed_handler = None
self._stderr_read_handler = None
self._stdout_read_handler = None
self._stderr_closed_handler = None
self._stdout_closed_handler = None
def start(self):
self.p = Popen(
self.args,
cwd=self.cwd,
shell=self.shell,
stdin=PIPE,
stderr=PIPE,
stdout=PIPE
)
self.stderr = BytesIO()
self.stdout = BytesIO()
self._status = None
self._stdin = File(
self.p.stdin,
channel="{0:d}.stdin".format(self.p.pid)
).register(self)
self._stderr = File(
self.p.stderr,
channel="{0:d}.stderr".format(self.p.pid)
).register(self)
self._stdout = File(
self.p.stdout,
channel="{0:d}.stdout".format(self.p.pid)
).register(self)
self._stderr_read_handler = self.addHandler(
handler("read", channel="{0:d}.stderr".format(self.p.pid))(
self.__class__._on_stderr_read
)
)
self._stdout_read_handler = self.addHandler(
handler("read", channel="{0:d}.stdout".format(self.p.pid))(
self.__class__._on_stdout_read
)
)
self._stderr_closed_handler = self.addHandler(
handler("closed", channel="{0:d}.stderr".format(self.p.pid))(
self.__class__._on_stderr_closed
)
)
self._stdout_closed_handler = self.addHandler(
handler("closed", channel="{0:d}.stdout".format(self.p.pid))(
self.__class__._on_stdout_closed
)
)
self.fire(started(self))
@staticmethod
def _on_stdout_closed(self):
self._stdout_closed = True
@staticmethod
def _on_stderr_closed(self):
self._stderr_closed = True
def stop(self):
if self.p is not None:
self.p.terminate()
def kill(self):
self.p.kill()
def signal(self, signal):
self.p.send_signal(signal)
def wait(self):
return self.p.wait()
def write(self, data):
self.fire(write(data), "{0:d}.stdin".format(self.p.pid))
@property
def status(self):
if getattr(self, "p", None) is not None:
return self.p.poll()
@staticmethod
def _on_stderr_read(self, data):
self.stderr.write(data)
@staticmethod
def _on_stdout_read(self, data):
self.stdout.write(data)
@handler("generate_events")
def _on_generate_events(self, event):
if self.p is not None and self._status is None:
self._status = self.p.poll()
if self._status is not None and self._stderr_closed \
and self._stdout_closed and not self._terminated:
self._terminated = True
self.removeHandler(self._stderr_read_handler)
self.removeHandler(self._stdout_read_handler)
self.removeHandler(self._stderr_closed_handler)
self.removeHandler(self._stdout_closed_handler)
self.fire(stopped(self))
event.reduce_time_left(0)
event.stop()
else:
event.reduce_time_left(TIMEOUT)