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Python Compiled Bytecode | 2009-11-11 | 9KB | 292 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.6)

__all__ = [
    'Process',
    'current_process',
    'active_children']
import os
import sys
import signal
import itertools

try:
    ORIGINAL_DIR = os.path.abspath(os.getcwd())
except OSError:
    ORIGINAL_DIR = None


def current_process():
    '''
    Return process object representing the current process
    '''
    return _current_process


def active_children():
    '''
    Return list of process objects corresponding to live child processes
    '''
    _cleanup()
    return list(_current_process._children)


def _cleanup():
    for p in list(_current_process._children):
        if p._popen.poll() is not None:
            _current_process._children.discard(p)
            continue



class Process(object):
    '''
    Process objects represent activity that is run in a separate process

    The class is analagous to `threading.Thread`
    '''
    _Popen = None

    def __init__(self, group = None, target = None, name = None, args = (), kwargs = { }):
        if not group is None:
            raise AssertionError, 'group argument must be None for now'
        count = _current_process._counter.next()
        self._identity = _current_process._identity + (count,)
        self._authkey = _current_process._authkey
        self._daemonic = _current_process._daemonic
        self._tempdir = _current_process._tempdir
        self._parent_pid = os.getpid()
        self._popen = None
        self._target = target
        self._args = tuple(args)
        self._kwargs = dict(kwargs)
        if not name:
            pass
        self._name = type(self).__name__ + '-' + ':'.join((lambda .0: for i in .0:
str(i))(self._identity))


    def run(self):
        '''
        Method to be run in sub-process; can be overridden in sub-class
        '''
        if self._target:
            self._target(*self._args, **self._kwargs)



    def start(self):
        '''
        Start child process
        '''
        if not self._popen is None:
            raise AssertionError, 'cannot start a process twice'
        if not self._parent_pid == os.getpid():
            raise AssertionError, 'can only start a process object created by current process'
        if not not (_current_process._daemonic):
            raise AssertionError, 'daemonic processes are not allowed to have children'
        _cleanup()
        self._popen = Popen(self)
        _current_process._children.add(self)


    def terminate(self):
        '''
        Terminate process; sends SIGTERM signal or uses TerminateProcess()
        '''
        self._popen.terminate()


    def join(self, timeout = None):
        '''
        Wait until child process terminates
        '''
        if not self._parent_pid == os.getpid():
            raise AssertionError, 'can only join a child process'
        if not self._popen is not None:
            raise AssertionError, 'can only join a started process'
        res = self._popen.wait(timeout)


    def is_alive(self):
        '''
        Return whether process is alive
        '''
        if self is _current_process:
            return True
        if not self._parent_pid == os.getpid():
            raise AssertionError, 'can only test a child process'
        if self._popen is None:
            return False
        self._popen.poll()
        return self._popen.returncode is None


    def name(self):
        return self._name

    name = property(name)

    def name(self, name):
        if not isinstance(name, str):
            raise AssertionError, 'name must be a string'
        self._name = name

    name = name.setter(name)

    def daemon(self):
        '''
        Return whether process is a daemon
        '''
        return self._daemonic

    daemon = property(daemon)

    def daemon(self, daemonic):
        '''
        Set whether process is a daemon
        '''
        if not self._popen is None:
            raise AssertionError, 'process has already started'
        self._daemonic = daemonic

    daemon = daemon.setter(daemon)

    def authkey(self):
        return self._authkey

    authkey = property(authkey)

    def authkey(self, authkey):
        '''
        Set authorization key of process
        '''
        self._authkey = AuthenticationString(authkey)

    authkey = authkey.setter(authkey)

    def exitcode(self):
        '''
        Return exit code of process or `None` if it has yet to stop
        '''
        if self._popen is None:
            return self._popen
        return self._popen.poll()

    exitcode = property(exitcode)

    def ident(self):
        '''
        Return indentifier (PID) of process or `None` if it has yet to start
        '''
        return self is _current_process if self is _current_process else self._popen.pid

    ident = property(ident)
    pid = ident

    def __repr__(self):
        if self is _current_process:
            status = 'started'
        elif self._parent_pid != os.getpid():
            status = 'unknown'
        elif self._popen is None:
            status = 'initial'
        elif self._popen.poll() is not None:
            status = self.exitcode
        else:
            status = 'started'
        if type(status) is int:
            if status == 0:
                status = 'stopped'
            else:
                status = 'stopped[%s]' % _exitcode_to_name.get(status, status)

        if not self._daemonic or ' daemon':
            pass
        return '<%s(%s, %s%s)>' % (type(self).__name__, self._name, status, '')


    def _bootstrap(self):
        global _current_process
        util = util
        import

        try:
            self._children = set()
            self._counter = itertools.count(1)

            try:
                sys.stdin.close()
                sys.stdin = open(os.devnull)
            except (OSError, ValueError):
                pass

            _current_process = self
            util._finalizer_registry.clear()
            util._run_after_forkers()
            util.info('child process calling self.run()')

            try:
                self.run()
                exitcode = 0
            finally:
                util._exit_function()

        except SystemExit:
            e = None
            if not e.args:
                exitcode = 1
            elif type(e.args[0]) is int:
                exitcode = e.args[0]
            else:
                sys.stderr.write(e.args[0] + '\n')
                sys.stderr.flush()
                exitcode = 1
        except:
            e.args
            exitcode = 1
            import traceback as traceback
            sys.stderr.write('Process %s:\n' % self.name)
            sys.stderr.flush()
            traceback.print_exc()

        util.info('process exiting with exitcode %d' % exitcode)
        return exitcode



class AuthenticationString(bytes):

    def __reduce__(self):
        Popen = Popen
        import forking
        if not Popen.thread_is_spawning():
            raise TypeError('Pickling an AuthenticationString object is disallowed for security reasons')
        Popen.thread_is_spawning()
        return (AuthenticationString, (bytes(self),))



class _MainProcess(Process):

    def __init__(self):
        self._identity = ()
        self._daemonic = False
        self._name = 'MainProcess'
        self._parent_pid = None
        self._popen = None
        self._counter = itertools.count(1)
        self._children = set()
        self._authkey = AuthenticationString(os.urandom(32))
        self._tempdir = None


_current_process = _MainProcess()
del _MainProcess
_exitcode_to_name = { }
for name, signum in signal.__dict__.items():
    if name[:3] == 'SIG' and '_' not in name:
        _exitcode_to_name[-signum] = name
        continue