149 lines
3.6 KiB
Python
149 lines
3.6 KiB
Python
# -*- Mode: Python -*-
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# vi:si:et:sw=4:sts=4:ts=4
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import os
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import signal
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import subprocess
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from whipper.extern import asyncsub
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from whipper.extern.task import task
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import logging
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logger = logging.getLogger(__name__)
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class SyncRunner(task.SyncRunner):
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pass
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class LoggableTask(task.Task):
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pass
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class LoggableMultiSeparateTask(task.MultiSeparateTask):
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pass
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class PopenTask(task.Task):
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"""
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I am a task that runs a command using Popen.
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"""
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logCategory = 'PopenTask'
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bufsize = 1024
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command = None
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cwd = None
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def start(self, runner):
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task.Task.start(self, runner)
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try:
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self._popen = asyncsub.Popen(self.command,
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bufsize=self.bufsize,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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close_fds=True, cwd=self.cwd)
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except OSError, e:
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import errno
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if e.errno == errno.ENOENT:
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self.commandMissing()
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raise
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logger.debug('Started %r with pid %d', self.command,
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self._popen.pid)
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self.schedule(1.0, self._read, runner)
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def _read(self, runner):
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try:
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read = False
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ret = self._popen.recv()
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if ret:
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logger.debug("read from stdout: %s", ret)
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self.readbytesout(ret)
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read = True
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ret = self._popen.recv_err()
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if ret:
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logger.debug("read from stderr: %s", ret)
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self.readbyteserr(ret)
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read = True
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# if we read anything, we might have more to read, so
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# reschedule immediately
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if read and self.runner:
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self.schedule(0.0, self._read, runner)
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return
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# if we didn't read anything, give the command more time to
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# produce output
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if self._popen.poll() is None and self.runner:
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# not finished yet
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self.schedule(1.0, self._read, runner)
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return
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self._done()
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except Exception, e:
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logger.debug('exception during _read(): %r', str(e))
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self.setException(e)
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self.stop()
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def _done(self):
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assert self._popen.returncode is not None, "No returncode"
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if self._popen.returncode >= 0:
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logger.debug('Return code was %d', self._popen.returncode)
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else:
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logger.debug('Terminated with signal %d',
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-self._popen.returncode)
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self.setProgress(1.0)
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if self._popen.returncode != 0:
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self.failed()
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else:
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self.done()
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self.stop()
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return
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def abort(self):
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logger.debug('Aborting, sending SIGTERM to %d', self._popen.pid)
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os.kill(self._popen.pid, signal.SIGTERM)
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# self.stop()
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def readbytesout(self, bytes):
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"""
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Called when bytes have been read from stdout.
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"""
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pass
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def readbyteserr(self, bytes):
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"""
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Called when bytes have been read from stderr.
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"""
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pass
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def done(self):
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"""
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Called when the command completed successfully.
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"""
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pass
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def failed(self):
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"""
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Called when the command failed.
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"""
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pass
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def commandMissing(self):
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"""
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Called when the command is missing.
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"""
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pass
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