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902 lines
27 KiB
Python
902 lines
27 KiB
Python
#!/usr/bin/env python2.5
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"""
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Python external execution contexts.
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"""
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import Queue
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import cPickle
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import cStringIO
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import commands
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import getpass
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import hmac
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import imp
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import inspect
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import logging
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import os
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import random
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import select
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import sha
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import signal
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import socket
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import struct
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import sys
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import syslog
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import textwrap
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import threading
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import traceback
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import types
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import zlib
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#
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# Module-level data.
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#
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LOG = logging.getLogger('econtext')
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GET_MODULE = 100L
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CALL_FUNCTION = 101L
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FORWARD_LOG = 102L
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#
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# Exceptions.
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#
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class ContextError(Exception):
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'Raised when a problem occurs with a context.'
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def __init__(self, fmt, *args):
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Exception.__init__(self, fmt % args)
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class ChannelError(ContextError):
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'Raised when a channel dies or has been closed.'
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class StreamError(ContextError):
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'Raised when a stream cannot be established.'
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class CorruptMessageError(StreamError):
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'Raised when a corrupt message is received on a stream.'
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class TimeoutError(StreamError):
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'Raised when a timeout occurs on a stream.'
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#
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# Helpers.
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#
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def write_all(fd, s):
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written = 0
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while written < len(s):
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rc = os.write(fd, buffer(s, written))
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if not rc:
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raise IOError('short write')
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written += rc
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return written
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def CreateChild(*args):
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"""
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Create a child process whose stdin/stdout is connected to a socket,
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returning `(pid, socket_obj)`.
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"""
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parentfp, childfp = socket.socketpair()
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pid = os.fork()
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if not pid:
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os.dup2(childfp.fileno(), 0)
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os.dup2(childfp.fileno(), 1)
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childfp.close()
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parentfp.close()
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os.execvp(args[0], args)
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raise SystemExit
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childfp.close()
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LOG.debug('CreateChild() child %d fd %d, parent %d, args %r',
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pid, parentfp.fileno(), os.getpid(), args)
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return pid, parentfp
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class Formatter(logging.Formatter):
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FMT = '%(asctime)s %(levelname).1s %(name)s: %(message)s'
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DATEFMT = '%H:%M:%S'
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def __init__(self, parent):
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self.parent = parent
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super(Formatter, self).__init__(self.FMT, self.DATEFMT)
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def format(self, record):
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s = super(Formatter, self).format(record)
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if 1:
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p = ''
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elif self.parent:
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p = '\x1b[32m'
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else:
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p = '\x1b[36m'
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return p + ('{%s} %s' % (os.getpid(), s))
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class Channel(object):
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def __init__(self, stream, handle):
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self._context = stream._context
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self._stream = stream
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self._handle = handle
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self._queue = Queue.Queue()
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self._context.AddHandleCB(self._InternalReceive, handle)
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def _InternalReceive(self, killed, data):
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"""
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Callback from the stream object; appends a tuple of
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(killed-or-closed, data) to the internal queue and wakes the internal
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event.
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Args:
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# Has the Stream object lost its connection?
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killed: bool
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data: (
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# Has the remote Channel had Close() called?
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bool,
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# The object passed to the remote Send()
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object
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)
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"""
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LOG.debug('%r._InternalReceive(%r, %r)', self, killed, data)
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self._queue.put((killed or data[0], killed or data[1]))
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def Close(self):
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"""
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Indicate this channel is closed to the remote side.
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"""
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LOG.debug('%r.Close()', self)
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self._stream.Enqueue(handle, (True, None))
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def Send(self, data):
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"""
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Send `data` to the remote.
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"""
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LOG.debug('%r.Send(%r)', self, data)
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self._stream.Enqueue(handle, (False, data))
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def Receive(self, timeout=None):
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"""
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Receive an object from the remote, or return ``None`` if `timeout` is
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reached.
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"""
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LOG.debug('%r.Receive(%r)', self, timeout)
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try:
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killed, data = self._queue.get(True, timeout)
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except Queue.Empty:
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return
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LOG.debug('%r.Receive() got killed=%r, data=%r', self, killed, data)
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if killed:
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raise ChannelError('Channel is closed.')
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return data
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def __iter__(self):
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"""
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Return an iterator that yields objects arriving on this channel, until
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the channel dies or is closed.
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"""
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while True:
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try:
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yield self.Receive()
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except ChannelError:
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return
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def __repr__(self):
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return 'econtext.Channel(%r, %r)' % (self._stream, self._handle)
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class SlaveModuleImporter(object):
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"""
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Import protocol implementation that fetches modules from the parent
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process.
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:param context: Context to communicate via.
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"""
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def __init__(self, context):
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self._context = context
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def find_module(self, fullname, path=None):
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LOG.debug('SlaveModuleImporter.find_module(%r)', fullname)
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try:
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imp.find_module(fullname)
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except ImportError:
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LOG.debug('find_module(%r) returning self', fullname)
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return self
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def load_module(self, fullname):
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LOG.debug('SlaveModuleImporter.load_module(%r)', fullname)
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ret = self._context.EnqueueAwaitReply(GET_MODULE, None, (fullname,))
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if ret is None:
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raise ImportError('Master does not have %r' % (fullname,))
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kind, path, data = ret
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code = compile(zlib.decompress(data), path, 'exec')
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module = imp.new_module(fullname)
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sys.modules[fullname] = module
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eval(code, vars(module), vars(module))
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return module
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class MasterModuleResponder(object):
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def __init__(self, context):
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self._context = context
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def GetModule(self, killed, data):
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if killed:
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return
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_, (reply_to, fullname) = data
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LOG.debug('SlaveModuleImporter.GetModule(%r, %r)', killed, fullname)
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mod = sys.modules.get(fullname)
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if mod:
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source = zlib.compress(inspect.getsource(mod))
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path = os.path.abspath(mod.__file__)
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self._context.Enqueue(reply_to, ('source', path, source))
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class LogForwarder(object):
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def __init__(self, context):
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self._context = context
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def ForwardLog(self, killed, data):
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if killed:
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return
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_, (s,) = data
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LOG.debug('%r: %s', self._context, s)
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#
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# Stream implementations.
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#
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class Side(object):
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def __init__(self, stream, fd):
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self.stream = stream
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self.fd = fd
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def __repr__(self):
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return '<fd %r of %r>' % (self.fd, self.stream)
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def fileno(self):
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return self.fd
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class BasicStream(object):
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read_side = None
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write_side = None
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def Disconnect(self):
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LOG.debug('%r: disconnect on %r', self._broker, self)
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self._broker.RemoveStream(self)
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def ReadMore(self):
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return True
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def WriteMore(self):
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return False
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class Stream(BasicStream):
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"""
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Initialize a new Stream instance.
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:param context: Context to communicate with.
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"""
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_input_buf = ''
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_output_buf = ''
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def __init__(self, context):
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self._context = context
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self._lock = threading.Lock()
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self._rhmac = hmac.new(context.key, digestmod=sha.new)
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self._whmac = self._rhmac.copy()
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self._pickler_file = cStringIO.StringIO()
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self._pickler = cPickle.Pickler(self._pickler_file, protocol=2)
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self._unpickler_file = cStringIO.StringIO()
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self._unpickler = cPickle.Unpickler(self._unpickler_file)
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def Pickle(self, obj):
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"""
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Serialize `obj` using the pickler.
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"""
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self._pickler.dump(obj)
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data = self._pickler_file.getvalue()
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self._pickler_file.seek(0)
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self._pickler_file.truncate(0)
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return data
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def Unpickle(self, data):
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"""
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Unserialize `data` into an object using the unpickler.
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"""
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LOG.debug('%r.Unpickle(%r)', self, data)
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self._unpickler_file.write(data)
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self._unpickler_file.seek(0)
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data = self._unpickler.load()
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self._unpickler_file.seek(0)
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self._unpickler_file.truncate(0)
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return data
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def Receive(self):
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"""
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Handle the next complete message on the stream. Raise
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CorruptMessageError or IOError on failure.
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"""
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LOG.debug('%r.Receive()', self)
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buf = os.read(self.read_side.fd, 4096)
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if not buf:
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return self.Disconnect()
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self._input_buf += buf
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if len(self._input_buf) < 24:
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return
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msg_mac = self._input_buf[:20]
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msg_len = struct.unpack('>L', self._input_buf[20:24])[0]
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if len(self._input_buf) < msg_len-24:
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LOG.debug('Input too short')
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return
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self._rhmac.update(self._input_buf[20:msg_len+24])
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expected_mac = self._rhmac.digest()
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if msg_mac != expected_mac:
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raise CorruptMessageError('%r got invalid MAC: expected %r, got %r',
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self, msg_mac.encode('hex'),
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expected_mac.encode('hex'))
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try:
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handle, data = self.Unpickle(self._input_buf[24:msg_len+24])
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self._input_buf = self._input_buf[msg_len+24:]
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handle = long(handle)
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LOG.debug('%r.Receive(): decoded handle=%r; data=%r',
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self, handle, data)
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persist, fn = self._context._handle_map[handle]
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if not persist:
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del self._context._handle_map[handle]
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except KeyError, ex:
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raise CorruptMessageError('%r got invalid handle: %r', self, handle)
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except (TypeError, ValueError), ex:
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raise CorruptMessageError('%r got invalid message: %s', self, ex)
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LOG.debug('Calling %r (%r, %r)', fn, False, data)
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fn(False, data)
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def Transmit(self):
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"""
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Transmit buffered messages.
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"""
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LOG.debug('%r.Transmit()', self)
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written = os.write(self.write_side.fd, self._output_buf[:4096])
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self._output_buf = self._output_buf[written:]
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def WriteMore(self):
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return bool(self._output_buf)
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def Enqueue(self, handle, obj):
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"""
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Enqueue `obj` to `handle`, and tell the broker we have output.
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"""
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LOG.debug('%r.Enqueue(%r, %r)', self, handle, obj)
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encoded = self.Pickle((handle, obj))
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msg = struct.pack('>L', len(encoded)) + encoded
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self._lock.acquire()
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try:
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self._whmac.update(msg)
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self._output_buf += self._whmac.digest() + msg
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finally:
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self._lock.release()
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self._context.broker.UpdateStream(self)
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def Disconnect(self):
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"""
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Close our associated file descriptor and tell registered callbacks the
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connection has been destroyed.
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"""
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LOG.debug('%r.Disconnect()', self)
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if self._context.GetStream() is self:
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self._context.SetStream(None)
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try:
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os.close(self.read_side.fd)
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except OSError, e:
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LOG.debug('%r.Disconnect(): did not close fd %s: %s',
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self, self.read_side.fd, e)
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if self.read_side.fd != self.write_side.fd:
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try:
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os.close(self.write_side.fd)
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except OSError, e:
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LOG.debug('%r.Disconnect(): did not close fd %s: %s',
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self, self.write_side.fd, e)
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self.read_side.fd = None
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self.write_side.fd = None
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for handle, (persist, fn) in self._context._handle_map.iteritems():
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LOG.debug('%r.Disconnect(): killing %r: %r', self, handle, fn)
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fn(True, None)
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def Accept(self, rfd, wfd):
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self.read_side = Side(self, os.dup(rfd))
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self.write_side = Side(self, os.dup(wfd))
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self._context.SetStream(self)
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self._context.broker.Register(self._context)
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def Connect(self):
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"""
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Connect to a Broker at the address specified in our associated Context.
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"""
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LOG.debug('%r.Connect()', self)
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.read_side = Side(self, sock.fileno())
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self.write_side = Side(self, sock.fileno())
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sock.connect(self._context.parent_addr)
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self.Enqueue(0, self._context.name)
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def __repr__(self):
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return 'econtext.%s(<context=%r>)' %\
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(self.__class__.__name__, self._context)
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class LocalStream(Stream):
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"""
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Base for streams capable of starting new slaves.
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"""
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python_path = property(
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lambda self: getattr(self, '_python_path', sys.executable),
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lambda self, path: setattr(self, '_python_path', path),
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doc='The path to the remote Python interpreter.')
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def __init__(self, context):
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super(LocalStream, self).__init__(context)
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self._permitted_modules = set(['exceptions'])
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self._unpickler.find_global = self._FindGlobal
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def _FindGlobal(self, module_name, class_name):
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"""
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Return the class implementing `module_name.class_name` or raise
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`StreamError` if the module is not whitelisted.
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"""
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if module_name not in self._permitted_modules:
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raise StreamError('context %r attempted to unpickle %r in module %r',
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self._context, class_name, module_name)
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return getattr(sys.modules[module_name], class_name)
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def AllowModule(self, module_name):
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"""
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Add `module_name` to the list of permitted modules.
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"""
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self._permitted_modules.add(module_name)
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# Hexed and passed to 'python -c'. It forks, dups 0->100, creates a pipe,
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# then execs a new interpreter with a custom argv. CONTEXT_NAME is replaced
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# with the context name. Optimized for size.
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def _FirstStage():
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import os,sys,zlib
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R,W=os.pipe()
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if os.fork():
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os.dup2(0,100)
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os.dup2(R,0)
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os.close(R)
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os.close(W)
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os.execv(sys.executable,(CONTEXT_NAME,))
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else:
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os.fdopen(W,'wb',0).write(zlib.decompress(sys.stdin.read(input())))
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print 'OK'
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sys.exit(0)
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def GetBootCommand(self):
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source = inspect.getsource(self._FirstStage)
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source = textwrap.dedent('\n'.join(source.strip().split('\n')[1:]))
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source = source.replace(' ', '\t')
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source = source.replace('CONTEXT_NAME', repr(self._context.name))
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encoded = source.encode('base64').replace('\n', '')
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return [self.python_path, '-c',
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'exec "%s".decode("base64")' % (encoded,)]
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, self._context)
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def Connect(self):
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LOG.debug('%r.Connect()', self)
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pid, sock = CreateChild(*self.GetBootCommand())
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self.read_side = Side(self, os.dup(sock.fileno()))
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self.write_side = self.read_side
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sock.close()
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LOG.debug('%r.Connect(): child process stdin/stdout=%r',
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self, self.read_side.fd)
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source = inspect.getsource(sys.modules[__name__])
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source += '\nExternalContextMain(%r, %r, %r)\n' % (
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self._context.name,
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self._context.broker._listener._listen_addr,
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self._context.key
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)
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compressed = zlib.compress(source)
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preamble = str(len(compressed)) + '\n' + compressed
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write_all(self.write_side.fd, preamble)
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assert os.read(self.read_side.fd, 3) == 'OK\n'
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class SSHStream(LocalStream):
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ssh_path = property(
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lambda self: getattr(self, '_ssh_path', 'ssh'),
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lambda self, path: setattr(self, '_ssh_path', path),
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doc='The path to the SSH binary.')
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def GetBootCommand(self):
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bits = [self.ssh_path]
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if self._context.username:
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bits += ['-l', self._context.username]
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bits.append(self._context.hostname)
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base = super(SSHStream, self).GetBootCommand()
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return bits + map(commands.mkarg, base)
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class Context(object):
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"""
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Represents a remote context regardless of connection method.
|
|
"""
|
|
|
|
def __init__(self, broker, name=None, hostname=None, username=None, key=None,
|
|
parent_addr=None):
|
|
self.broker = broker
|
|
self.name = name
|
|
self.hostname = hostname
|
|
self.username = username
|
|
self.parent_addr = parent_addr
|
|
self.key = key or ('%016x' % random.getrandbits(128))
|
|
|
|
self._last_handle = 1000L
|
|
self._handle_map = {}
|
|
self._lock = threading.Lock()
|
|
|
|
self.responder = MasterModuleResponder(self)
|
|
self.AddHandleCB(self.responder.GetModule, handle=GET_MODULE)
|
|
|
|
self.log_forwarder = LogForwarder(self)
|
|
self.AddHandleCB(self.log_forwarder.ForwardLog, handle=FORWARD_LOG)
|
|
|
|
def GetStream(self):
|
|
return self._stream
|
|
|
|
def SetStream(self, stream):
|
|
self._stream = stream
|
|
return stream
|
|
|
|
def AllocHandle(self):
|
|
"""
|
|
Allocate a unique handle for this stream.
|
|
|
|
Returns:
|
|
long
|
|
"""
|
|
self._lock.acquire()
|
|
try:
|
|
self._last_handle += 1L
|
|
return self._last_handle
|
|
finally:
|
|
self._lock.release()
|
|
|
|
def AddHandleCB(self, fn, handle, persist=True):
|
|
"""
|
|
Register `fn(killed, obj)` to run for each `obj` sent to `handle`. If
|
|
`persist` is ``False`` then unregister after one delivery.
|
|
"""
|
|
LOG.debug('%r.AddHandleCB(%r, %r, persist=%r)',
|
|
self, fn, handle, persist)
|
|
self._handle_map[handle] = persist, fn
|
|
|
|
def Enqueue(self, handle, obj):
|
|
self._stream.Enqueue(handle, obj)
|
|
|
|
def EnqueueAwaitReply(self, handle, deadline, data):
|
|
"""
|
|
Send `data` to `handle` and wait for a response with an optional
|
|
timeout. The message contains `(reply_to, data)`, where `reply_to` is
|
|
the handle on which this function expects its reply.
|
|
"""
|
|
reply_to = self.AllocHandle()
|
|
LOG.debug('%r.EnqueueAwaitReply(%r, %r, %r) -> reply handle %d',
|
|
self, handle, deadline, data, reply_to)
|
|
|
|
queue = Queue.Queue()
|
|
|
|
def _Receive(killed, data):
|
|
LOG.debug('%r._Receive(%r, %r)', self, killed, data)
|
|
queue.put((killed, data))
|
|
|
|
self.AddHandleCB(_Receive, reply_to, persist=False)
|
|
self._stream.Enqueue(handle, (False, (reply_to,) + data))
|
|
|
|
try:
|
|
killed, data = queue.get(True, deadline)
|
|
except Queue.Empty:
|
|
self._stream.Disconnect()
|
|
raise TimeoutError('deadline exceeded.')
|
|
|
|
if killed:
|
|
raise StreamError('lost connection during call.')
|
|
|
|
LOG.debug('%r._EnqueueAwaitReply(): got reply: %r', self, data)
|
|
return data
|
|
|
|
def CallWithDeadline(self, fn, deadline, *args, **kwargs):
|
|
LOG.debug('%r.CallWithDeadline(%r, %r, *%r, **%r)',
|
|
self, fn, deadline, args, kwargs)
|
|
|
|
if isinstance(fn, types.MethodType) and \
|
|
isinstance(fn.im_self, (type, types.ClassType)):
|
|
fn_class = fn.im_self.__name__
|
|
else:
|
|
fn_class = None
|
|
|
|
call = (fn.__module__, fn_class, fn.__name__, args, kwargs)
|
|
success, result = self.EnqueueAwaitReply(CALL_FUNCTION, deadline, call)
|
|
|
|
if success:
|
|
return result
|
|
else:
|
|
exc_obj, traceback = result
|
|
exc_obj.real_traceback = traceback
|
|
raise exc_obj
|
|
|
|
def Call(self, fn, *args, **kwargs):
|
|
return self.CallWithDeadline(fn, None, *args, **kwargs)
|
|
|
|
def __repr__(self):
|
|
bits = map(repr, filter(None, [self.name, self.hostname, self.username]))
|
|
return 'Context(%s)' % ', '.join(bits)
|
|
|
|
|
|
class Waker(BasicStream):
|
|
def __init__(self, broker):
|
|
self._broker = broker
|
|
rfd, wfd = os.pipe()
|
|
self.read_side = Side(self, rfd)
|
|
self.write_side = Side(self, wfd)
|
|
broker.AddStream(self)
|
|
|
|
def Wake(self):
|
|
os.write(self.write_side.fd, ' ')
|
|
|
|
def Receive(self):
|
|
LOG.debug('%r: waking %r', self, self._broker)
|
|
os.read(self.read_side.fd, 1)
|
|
|
|
|
|
class Listener(BasicStream):
|
|
def __init__(self, broker, address=None, backlog=30):
|
|
self._broker = broker
|
|
self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self._sock.bind(address or ('0.0.0.0', 0))
|
|
self._sock.listen(backlog)
|
|
self._listen_addr = self._sock.getsockname()
|
|
self.read_side = Side(self, self._sock.fileno())
|
|
broker.AddStream(self)
|
|
|
|
def Receive(self):
|
|
sock, addr = self._sock.accept()
|
|
context = Context(self._broker, name=addr)
|
|
Stream(context).Accept(sock.fileno(), sock.fileno())
|
|
|
|
|
|
class IoLogger(BasicStream):
|
|
_buf = ''
|
|
|
|
def __init__(self, broker, name):
|
|
self._broker = broker
|
|
self._name = name
|
|
rfd, wfd = os.pipe()
|
|
self.read_side = Side(self, rfd)
|
|
self.write_side = Side(self, wfd)
|
|
self._broker.AddStream(self)
|
|
|
|
def _LogLines(self):
|
|
while self._buf.find('\n') != -1:
|
|
line, _, self._buf = self._buf.partition('\n')
|
|
LOG.debug('%s: %s', self._name, line.rstrip('\n'))
|
|
|
|
def Receive(self):
|
|
buf = os.read(self.read_side.fd, 4096)
|
|
if not buf:
|
|
return self.Disconnect()
|
|
|
|
self._buf += buf
|
|
self._LogLines()
|
|
|
|
|
|
class Broker(object):
|
|
"""
|
|
Context broker: this is responsible for keeping track of contexts, any
|
|
stream that is associated with them, and for I/O multiplexing.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self._dead = False
|
|
self._lock = threading.Lock()
|
|
self._stopped = threading.Event()
|
|
self._contexts = {}
|
|
self._readers = set()
|
|
self._writers = set()
|
|
self._waker = None
|
|
self._waker = Waker(self)
|
|
|
|
self._thread = threading.Thread(target=self._Loop, name='Broker')
|
|
self._thread.start()
|
|
|
|
def CreateListener(self, address=None, backlog=30):
|
|
"""
|
|
Listen on `address `for connections from newly spawned contexts.
|
|
"""
|
|
self._listener = Listener(self, address, backlog)
|
|
|
|
def _UpdateStream(self, stream):
|
|
LOG.debug('_UpdateStream(%r)', stream)
|
|
if stream.ReadMore() and stream.read_side.fileno():
|
|
self._readers.add(stream.read_side)
|
|
else:
|
|
self._readers.discard(stream.read_side)
|
|
|
|
if stream.WriteMore() and stream.write_side.fileno():
|
|
self._writers.add(stream.write_side)
|
|
else:
|
|
self._writers.discard(stream.write_side)
|
|
|
|
def UpdateStream(self, stream):
|
|
LOG.debug('UpdateStream(%r)', stream)
|
|
self._UpdateStream(stream)
|
|
if self._waker:
|
|
self._waker.Wake()
|
|
|
|
def AddStream(self, stream):
|
|
self.UpdateStream(stream)
|
|
|
|
def Register(self, context):
|
|
"""
|
|
Put a context under control of this broker.
|
|
"""
|
|
LOG.debug('%r.Register(%r) -> r=%r w=%r', self, context,
|
|
context.GetStream().read_side,
|
|
context.GetStream().write_side)
|
|
self.AddStream(context.GetStream())
|
|
self._contexts[context.name] = context
|
|
return context
|
|
|
|
def GetLocal(self, name='default'):
|
|
"""
|
|
Get the named context running on the local machine, creating it if it
|
|
does not exist.
|
|
"""
|
|
context = Context(self, name)
|
|
context.SetStream(LocalStream(context)).Connect()
|
|
return self.Register(context)
|
|
|
|
def GetRemote(self, hostname, username, name=None, python_path=None):
|
|
"""
|
|
Get the named remote context, creating it if it does not exist.
|
|
"""
|
|
if name is None:
|
|
name = 'econtext[%s@%s:%d]' %\
|
|
(username, socket.gethostname(), os.getpid())
|
|
|
|
context = Context(self, name, hostname, username)
|
|
stream = SSHStream(context)
|
|
if python_path:
|
|
stream.python_path = python_path
|
|
context.SetStream(stream)
|
|
stream.Connect()
|
|
return self.Register(context)
|
|
|
|
def _LoopOnce(self):
|
|
LOG.debug('%r.Loop()', self)
|
|
#LOG.debug('readers = %r', self._readers)
|
|
#LOG.debug('rfds = %r', [r.fileno() for r in self._readers])
|
|
#LOG.debug('writers = %r', self._writers)
|
|
#LOG.debug('wfds = %r', [w.fileno() for w in self._writers])
|
|
rsides, wsides, _ = select.select(self._readers, self._writers, ())
|
|
for side in rsides:
|
|
LOG.debug('%r: POLLIN for %r', self, side.stream)
|
|
side.stream.Receive()
|
|
self._UpdateStream(side.stream)
|
|
|
|
for side in wsides:
|
|
LOG.debug('%r: POLLOUT for %r', self, side.stream)
|
|
side.stream.Transmit()
|
|
self._UpdateStream(side.stream)
|
|
|
|
def _Loop(self):
|
|
"""
|
|
Handle stream events until Finalize() is called.
|
|
"""
|
|
try:
|
|
while not self._dead:
|
|
self._LoopOnce()
|
|
|
|
for context in self._contexts.itervalues():
|
|
stream = context.GetStream()
|
|
if stream:
|
|
stream.Disconnect()
|
|
|
|
self._stopped.set()
|
|
except Exception:
|
|
LOG.exception('Loop() crashed')
|
|
|
|
def Wait(self):
|
|
"""
|
|
Wait for the broker to stop.
|
|
"""
|
|
self._stopped.wait()
|
|
|
|
def Finalize(self):
|
|
"""
|
|
Tell all active streams to disconnect.
|
|
"""
|
|
self._dead = True
|
|
self._waker.Wake()
|
|
self.Wait()
|
|
|
|
def __repr__(self):
|
|
return 'econtext.Broker(<contexts=%s>)' % (self._contexts.keys(),)
|
|
|
|
|
|
def ExternalContextMain(context_name, parent_addr, key):
|
|
syslog.openlog('%s:%s' % (getpass.getuser(), context_name), syslog.LOG_PID)
|
|
syslog.syslog('initializing (parent=%s)' % (os.getenv('SSH_CLIENT'),))
|
|
|
|
logging.basicConfig(level=logging.INFO)
|
|
logging.getLogger('').handlers[0].formatter = Formatter(False)
|
|
LOG.debug('ExternalContextMain(%r, %r, %r)', context_name, parent_addr, key)
|
|
|
|
os.wait() # Reap the first stage.
|
|
os.dup2(100, 0)
|
|
os.close(100)
|
|
|
|
broker = Broker()
|
|
context = Context(broker, 'parent', parent_addr=parent_addr, key=key)
|
|
|
|
stream = Stream(context)
|
|
channel = Channel(stream, CALL_FUNCTION)
|
|
|
|
#stdout_log = IoLogger(broker, 'stdout')
|
|
#stderr_log = IoLogger(broker, 'stderr')
|
|
|
|
stream.Accept(0, 1)
|
|
os.close(0)
|
|
os.dup2(2, 1)
|
|
#os.dup2(stdout_log.write_side.fd, 1)
|
|
#os.dup2(stderr_log.write_side.fd, 2)
|
|
|
|
# stream = context.SetStream(Stream(context))
|
|
# stream.
|
|
# stream.Connect()
|
|
broker.Register(context)
|
|
|
|
importer = SlaveModuleImporter(context)
|
|
sys.meta_path.append(importer)
|
|
|
|
LOG.debug('start recv')
|
|
for call_info in channel:
|
|
LOG.debug('ExternalContextMain(): CALL_FUNCTION %r', call_info)
|
|
reply_to, mod_name, class_name, func_name, args, kwargs = call_info
|
|
|
|
try:
|
|
fn = getattr(__import__(mod_name), func_name)
|
|
stream.Enqueue(reply_to, (True, fn(*args, **kwargs)))
|
|
except Exception, e:
|
|
stream.Enqueue(reply_to, (False, (e, traceback.extract_stack())))
|
|
|
|
broker.Finalize()
|
|
LOG.debug('ExternalContextMain exitting')
|