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149 lines
4.9 KiB
Python
149 lines
4.9 KiB
Python
#!/usr/bin/env python
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# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
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import os, sys
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import signal
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import threading
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import subprocess
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from subprocess import Popen, PIPE, STDOUT
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# **heavily** chopped up and modfied version of asyncproc.py
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# to make it actually work on Windows as well as Mac/Linux
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# For the original see:
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# "http://www.lysator.liu.se/~bellman/download/"
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# author is "Thomas Bellman <bellman@lysator.liu.se>"
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# available under GPL version 3 or Later
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# create an asynchronous subprocess whose output can be collected in
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# a non-blocking manner
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# What a mess! Have to use threads just to get non-blocking io
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# in a cross-platform manner
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# luckily all thread use is hidden within this class
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class Process(object):
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def __init__(self, *params, **kwparams):
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if len(params) <= 3:
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kwparams.setdefault('stdin', subprocess.PIPE)
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if len(params) <= 4:
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kwparams.setdefault('stdout', subprocess.PIPE)
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if len(params) <= 5:
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kwparams.setdefault('stderr', subprocess.PIPE)
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self.__pending_input = []
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self.__collected_outdata = []
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self.__collected_errdata = []
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self.__exitstatus = None
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self.__lock = threading.Lock()
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self.__inputsem = threading.Semaphore(0)
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self.__quit = False
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self.__process = subprocess.Popen(*params, **kwparams)
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if self.__process.stdin:
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self.__stdin_thread = threading.Thread(
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name="stdin-thread",
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target=self.__feeder, args=(self.__pending_input,
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self.__process.stdin))
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self.__stdin_thread.setDaemon(True)
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self.__stdin_thread.start()
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if self.__process.stdout:
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self.__stdout_thread = threading.Thread(
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name="stdout-thread",
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target=self.__reader, args=(self.__collected_outdata,
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self.__process.stdout))
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self.__stdout_thread.setDaemon(True)
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self.__stdout_thread.start()
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if self.__process.stderr:
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self.__stderr_thread = threading.Thread(
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name="stderr-thread",
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target=self.__reader, args=(self.__collected_errdata,
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self.__process.stderr))
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self.__stderr_thread.setDaemon(True)
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self.__stderr_thread.start()
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def pid(self):
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return self.__process.pid
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def kill(self, signal):
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self.__process.send_signal(signal)
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# check on subprocess (pass in 'nowait') to act like poll
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def wait(self, flag):
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if flag.lower() == 'nowait':
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rc = self.__process.poll()
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else:
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rc = self.__process.wait()
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if rc != None:
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if self.__process.stdin:
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self.closeinput()
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if self.__process.stdout:
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self.__stdout_thread.join()
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if self.__process.stderr:
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self.__stderr_thread.join()
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return self.__process.returncode
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def terminate(self):
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if self.__process.stdin:
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self.closeinput()
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self.__process.terminate()
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# thread gets data from subprocess stdout
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def __reader(self, collector, source):
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while True:
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data = os.read(source.fileno(), 65536)
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self.__lock.acquire()
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collector.append(data)
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self.__lock.release()
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if data == "":
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source.close()
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break
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return
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# thread feeds data to subprocess stdin
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def __feeder(self, pending, drain):
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while True:
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self.__inputsem.acquire()
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self.__lock.acquire()
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if not pending and self.__quit:
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drain.close()
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self.__lock.release()
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break
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data = pending.pop(0)
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self.__lock.release()
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drain.write(data)
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# non-blocking read of data from subprocess stdout
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def read(self):
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self.__lock.acquire()
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outdata = "".join(self.__collected_outdata)
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del self.__collected_outdata[:]
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self.__lock.release()
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return outdata
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# non-blocking read of data from subprocess stderr
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def readerr(self):
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self.__lock.acquire()
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errdata = "".join(self.__collected_errdata)
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del self.__collected_errdata[:]
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self.__lock.release()
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return errdata
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# non-blocking write to stdin of subprocess
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def write(self, data):
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if self.__process.stdin is None:
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raise ValueError("Writing to process with stdin not a pipe")
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self.__lock.acquire()
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self.__pending_input.append(data)
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self.__inputsem.release()
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self.__lock.release()
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# close stdinput of subprocess
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def closeinput(self):
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self.__lock.acquire()
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self.__quit = True
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self.__inputsem.release()
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self.__lock.release()
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