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758 lines
21 KiB
Python
758 lines
21 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 atexit
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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 os
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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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GET_MODULE = 0L
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CALL_FUNCTION = 1L
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DEBUG = True
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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 Log(fmt, *args):
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if DEBUG:
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sys.stderr.write('%d (%d): %s\n' % (os.getpid(), os.getppid(),
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(fmt%args).replace('econtext.', '')))
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def CreateChild(*args):
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'''
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Create a child process whos stdin/stdout is connected to a socket.
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Returns:
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pid, socket
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'''
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sock1, sock2 = socket.socketpair()
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pid = os.fork()
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if not pid:
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for pair in ((0, sock1), (1, sock2)):
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os.dup2(sock2.fileno(), pair[0])
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os.close(pair[1].fileno())
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os.execvp(args[0], args)
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raise SystemExit
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return pid, sock1
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class PartialFunction(object):
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def __init__(self, fn, *partial_args):
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self.fn = fn
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self.partial_args = partial_args
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def __call__(self, *args, **kwargs):
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return self.fn(*(self.partial_args+args), **kwargs)
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def __repr__(self):
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return 'PartialFunction(%r, *%r)' % (self.fn, self.partial_args)
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class Channel(object):
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def __init__(self, stream, handle):
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self._stream = stream
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self._handle = handle
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self._wake_event = threading.Event()
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self._queue_lock = threading.Lock()
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self._queue = []
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self._stream.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('%r._InternalReceive(%r, %r)', self, killed, data)
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self._queue_lock.acquire()
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try:
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self._queue.append((killed or data[0], killed or data[1]))
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self._wake_event.set()
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finally:
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self._queue_lock.release()
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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('%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 the given object to the remote side.
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'''
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Log('%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 the next object to arrive on this channel, or return if the
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optional timeout is reached.
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Args:
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timeout: float
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Returns:
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object
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'''
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Log('%r.Receive(%r)', self, timeout)
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if not self._queue:
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self._wake_event.wait(timeout)
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if not self._wake_event.isSet():
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return
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self._queue_lock.acquire()
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try:
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self._wake_event.clear()
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Log('%r.Receive() queue is %r', self, self._queue)
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closed, data = self._queue.pop(0)
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Log('%r.Receive() got closed=%r, data=%r', self, closed, data)
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if closed:
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raise ChannelError('Channel is closed.')
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return data
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finally:
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self._queue_lock.release()
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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 the
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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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This implements the import protocol described in PEP 302. It works like so:
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- Python asks it if it can import a module.
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- It asks Python (via imp module) if it can import the module.
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- If Python says yes, it says no.
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- If Python says no, it asks the parent context for the module.
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- If the module isn't returned by the parent, asplode, otherwise ask Python
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to load the returned module.
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This roundabout crap is necessary because the built-in importer is tried only
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after custom hooks are. A class method is provided for the parent context to
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satisfy the module request; it will only return modules that have been loaded
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in the parent context.
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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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if not imp.find_module(fullname):
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return self
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def load_module(self, fullname):
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kind, data = self._context.EnqueueAwaitReply(GET_MODULE, fullname)
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def GetModule(cls, killed, fullname):
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Log('%r.GetModule(%r, %r)', cls, killed, fullname)
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if killed:
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return
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if fullname in sys.modules:
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pass
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GetModule = classmethod(GetModule)
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#
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# Stream implementations.
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#
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class Stream(object):
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def __init__(self, context):
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self._context = context
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self._input_buf = self._output_buf = ''
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self._input_buf_lock = threading.Lock()
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self._output_buf_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._last_handle = 0
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self._handle_map = {}
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self._handle_lock = threading.Lock()
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self._func_refs = {}
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self._func_ref_lock = threading.Lock()
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self._pickler_file = cStringIO.StringIO()
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self._pickler = cPickle.Pickler(self._pickler_file)
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self._pickler.persistent_id = self._CheckFunctionPerID
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self._unpickler_file = cStringIO.StringIO()
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self._unpickler = cPickle.Unpickler(self._unpickler_file)
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self._unpickler.persistent_load = self._LoadFunctionFromPerID
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def Pickle(self, obj):
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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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Log('%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 _CheckFunctionPerID(self, obj):
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'''
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Please see the cPickle documentation. Given an object, return None
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indicating normal pickle processing or a string 'persistent ID'.
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Args:
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obj: object
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Returns:
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str
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'''
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if isinstance(obj, (types.FunctionType, types.MethodType)):
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pid = 'FUNC:' + repr(obj)
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self._func_refs[per_id] = obj
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return pid
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def _LoadFunctionFromPerID(self, pid):
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'''
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Please see the cPickle documentation. Given a string created by
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_CheckFunctionPerID, turn it into an object again.
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Args:
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pid: str
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Returns:
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object
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'''
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if not pid.startswith('FUNC:'):
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raise CorruptMessageError('unrecognized persistent ID received: %r', pid)
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return PartialFunction(self._CallPersistentWhatsit, pid)
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def AllocHandle(self):
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'''
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Allocate a unique handle for this stream.
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Returns:
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long
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'''
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self._handle_lock.acquire()
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try:
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self._last_handle += 1L
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finally:
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self._handle_lock.release()
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return self._last_handle
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def AddHandleCB(self, fn, handle, persist=True):
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'''
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Arrange to invoke the given function for all messages tagged with the given
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handle. By default, process one message and discard this arrangement.
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Args:
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fn: callable
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handle: long
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persist: bool
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'''
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Log('%r.AddHandleCB(%r, %r, persist=%r)', self, fn, handle, persist)
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self._handle_lock.acquire()
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try:
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self._handle_map[handle] = persist, fn
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finally:
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self._handle_lock.release()
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def Receive(self):
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'''
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Handle the next complete message on the stream. Raise CorruptMessageError
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or IOError on failure.
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'''
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Log('%r.Receive()', self)
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self._input_buf += os.read(self._rfd, 4096)
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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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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+4:]
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handle = long(handle)
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Log('%r.Receive(): decoded handle=%r; data=%r', self, handle, data)
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persist, fn = self._handle_map[handle]
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if not persist:
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del self._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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fn(False, data)
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def Transmit(self):
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'''
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Transmit pending messages. Raises IOError on failure. Return value
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indicates whether there is still data buffered.
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Returns:
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bool
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'''
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Log('%r.Transmit()', self)
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written = os.write(self._fd, self._output_buf[:4096])
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self._output_buf = self._output_buf[written:]
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return bool(self._output_buf)
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def Enqueue(self, handle, data):
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Log('%r.Enqueue(%r, %r)', self, handle, data)
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self._output_buf_lock.acquire()
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try:
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encoded = self.Pickle((handle, data))
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msg = struct.pack('>L', len(encoded)) + encoded
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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._output_buf_lock.release()
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self._context.broker.Register(self._context)
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def Disconnect(self):
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'''
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Called to handle disconnects.
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'''
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Log('%r.Disconnect()', self)
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try:
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os.close(self._fd)
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except OSError, e:
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Log('WARNING: %s', e)
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for handle, (persist, fn) in self._handle_map.iteritems():
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Log('%r.Disconnect(): killing stale callback handle=%r; fn=%r',
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self, handle, fn)
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fn(True, None)
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@classmethod
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def Accept(cls, broker, sock):
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context = Context(broker)
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stream = cls(context)
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context.SetStream(stream)
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broker.Register(context)
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def Connect(self):
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'''
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Connect to a Broker at the address given in the Context instance.
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'''
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self._fd = 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 fileno(self):
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return self._fd
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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 = {}
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self._unpickler.find_global = self._FindGlobal
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self.AddHandleCB(SlaveModuleImporter.GetModule, handle=GET_MODULE)
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def _FindGlobal(self, module_name, class_name):
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'''
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See the cPickle documentation: given a module and class name, determine
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whether class referred to is safe for unpickling.
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Args:
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module_name: str
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class_name: str
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Returns:
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classobj or type
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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 the given module to the list of permitted modules.
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Args:
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module_name: str
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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 source 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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return [ self.python_path, '-c',
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'exec "%s".decode("hex")' % (source.encode('hex'),) ]
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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('%r.Connect()', self)
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pid, sock = CreateChild(*self.GetBootCommand())
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self._fd = sock.fileno()
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Log('%r.Connect(): chlid process stdin/stdout=%r', self, self._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, self._context.broker._listen_addr,
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self._context.key)
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compressed = zlib.compress(source)
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preamble = str(len(compressed)) + '\n' + compressed
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sock.sendall(preamble)
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assert os.read(self._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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return bits + map(commands.mkarg, super(SSHStream, self).GetBootCommand())
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class Context(object):
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'''
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Represents a remote context regardless of connection method.
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'''
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def __init__(self, broker, name=None, hostname=None, username=None, key=None,
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parent_addr=None):
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self.broker = broker
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self.name = name
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self.hostname = hostname
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self.username = username
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self.parent_addr = parent_addr
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if key:
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self.key = key
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else:
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self.key = file('/dev/urandom', 'rb').read(16).encode('hex')
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|
|
def GetStream(self):
|
|
return self._stream
|
|
|
|
def SetStream(self, stream):
|
|
self._stream = stream
|
|
return stream
|
|
|
|
def EnqueueAwaitReply(self, handle, deadline, data):
|
|
'''
|
|
Send a message to the given handle and wait for a response with an optional
|
|
timeout. The message contains (reply_handle, data), where reply_handle is
|
|
the handle on which this function expects its reply.
|
|
'''
|
|
Log('%r.EnqueueAwaitReply(%r, %r, %r)', self, handle, deadline, data)
|
|
reply_handle = self._stream.AllocHandle()
|
|
reply_event = threading.Event()
|
|
container = []
|
|
|
|
def _Receive(killed, data):
|
|
Log('%r._Receive(%r, %r)', self, killed, data)
|
|
container.extend([killed, data])
|
|
reply_event.set()
|
|
|
|
self._stream.AddHandleCB(_Receive, reply_handle, persist=False)
|
|
self._stream.Enqueue(CALL_FUNCTION, (False, (reply_handle,) + data))
|
|
|
|
reply_event.wait(deadline)
|
|
if not reply_event.isSet():
|
|
self.Disconnect()
|
|
raise TimeoutError('deadline exceeded.')
|
|
|
|
killed, data = container
|
|
if killed:
|
|
raise StreamError('lost connection during call.')
|
|
|
|
Log('%r._EnqueueAwaitReply(): got reply: %r', self, data)
|
|
return data
|
|
|
|
def CallWithDeadline(self, fn, deadline, *args, **kwargs):
|
|
Log('%r.CallWithDeadline(%r, %r, *%r, **%r)', self, fn, deadline, args,
|
|
kwargs)
|
|
|
|
call = (fn.__module__, 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 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._poller = select.poll()
|
|
self._poller_fd_map = {}
|
|
self._poller_lock = threading.Lock()
|
|
self._contexts = {}
|
|
|
|
self._wake_rfd, self._wake_wfd = os.pipe()
|
|
self._poller.register(self._wake_rfd)
|
|
|
|
self._listen_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self._listen_sock.bind(('0.0.0.0', 0)) # plz 2 allocate 4 me kthx.
|
|
self._listen_sock.listen(5)
|
|
self._listen_addr = self._listen_sock.getsockname()
|
|
self._poller.register(self._listen_sock)
|
|
|
|
self._thread = threading.Thread(target=self.Loop, name='Broker')
|
|
self._thread.setDaemon(True)
|
|
self._thread.start()
|
|
|
|
def Register(self, context):
|
|
'''
|
|
Put a context under control of this broker.
|
|
'''
|
|
Log('%r.Register(%r)', self, context)
|
|
self._poller_lock.acquire()
|
|
os.write(self._wake_wfd, ' ')
|
|
try:
|
|
self._contexts[context.name] = context
|
|
self._poller.register(context.GetStream())
|
|
self._poller_fd_map[context.GetStream().fileno()] = context.GetStream()
|
|
finally:
|
|
self._poller_lock.release()
|
|
return context
|
|
|
|
def GetLocal(self, name):
|
|
'''
|
|
Return the named local context, or create it if it doesn't exist.
|
|
|
|
Args:
|
|
name: 'my-local-context'
|
|
Returns:
|
|
econtext.Context
|
|
'''
|
|
context = Context(self, name)
|
|
context.SetStream(LocalStream(context)).Connect()
|
|
return self.Register(context)
|
|
|
|
def GetRemote(self, hostname, username, name=None):
|
|
'''
|
|
Return the named remote context, or create it if it doesn't exist.
|
|
'''
|
|
if name is None:
|
|
name = 'econtext[%s@%s:%d]' %\
|
|
(username, os.getenv('HOSTNAME'), os.getpid())
|
|
|
|
context = Context(self, name, hostname, username)
|
|
context.SetStream(SSHStream(context)).Connect()
|
|
return self.Register(context)
|
|
|
|
def Loop(self):
|
|
'''
|
|
Handle stream events until Finalize() is called.
|
|
'''
|
|
while not self._dead:
|
|
Log('%r.Loop()', self)
|
|
self._poller_lock.acquire()
|
|
self._poller_lock.release()
|
|
for fd, event in self._poller.poll():
|
|
if fd == self._wake_rfd:
|
|
Log('%r: got event on wake_rfd=%d.', self, self._wake_rfd)
|
|
os.read(self._wake_rfd, 1)
|
|
break
|
|
elif fd == self._listen_sock.fileno():
|
|
Stream.Accept(self, self._listen_sock.accept())
|
|
continue
|
|
|
|
obj = self._poller_fd_map[fd]
|
|
if event & select.POLLHUP:
|
|
Log('%r: POLLHUP on %r', self, obj)
|
|
obj.Disconnect()
|
|
elif event & select.POLLIN:
|
|
Log('%r: POLLIN on %r', self, obj)
|
|
obj.Receive()
|
|
elif event & select.POLLOUT:
|
|
Log('%r: POLLOUT on %r', self, obj)
|
|
if not obj.Transmit(): # If no output buffered, unset POLLOUT.
|
|
self._poller.unregister(obj)
|
|
self._poller.register(obj, select.POLLIN)
|
|
elif event & select.POLLNVAL:
|
|
Log('%r: POLLNVAL for %r', self, obj)
|
|
obj.Disconnect()
|
|
self._poller.unregister(obj)
|
|
|
|
def Finalize(self):
|
|
'''
|
|
Tell all active streams to disconnect.
|
|
'''
|
|
self._dead = True
|
|
self._poller_lock.acquire()
|
|
try:
|
|
for name, context in self._contexts.iteritems():
|
|
context.GetStream().Disconnect()
|
|
finally:
|
|
self._poller_lock.release()
|
|
|
|
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'),))
|
|
Log('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 = context.SetStream(Stream(context))
|
|
stream.Connect()
|
|
broker.Register(context)
|
|
|
|
for call_info in Channel(stream, CALL_FUNCTION):
|
|
Log('ExternalContextMain(): CALL_FUNCTION %r', call_info)
|
|
reply_handle, mod_name, func_name, args, kwargs = call_info
|
|
fn = getattr(__import__(mod_name), func_name)
|
|
|
|
try:
|
|
stream.Enqueue(reply_handle, (True, fn(*args, **kwargs)))
|
|
except Exception, e:
|
|
stram.Enqueue(reply_handle, (False, (e, traceback.extract_stack())))
|