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712 lines
21 KiB
Python
712 lines
21 KiB
Python
"""
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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 fcntl
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import hmac
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import imp
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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 socket
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import struct
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import sys
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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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LOG = logging.getLogger('econtext')
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IOLOG = logging.getLogger('econtext.io')
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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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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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class CallError(ContextError):
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"""Raised when .Call() fails"""
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def __init__(self, e):
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name = '%s.%s' % (type(e).__module__, type(e).__name__)
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tb = sys.exc_info()[2]
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if tb:
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stack = ''.join(traceback.format_tb(tb))
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else:
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stack = ''
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ContextError.__init__(self, 'Call failed: %s: %s\n%s', name, e, stack)
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class Dead(object):
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def __eq__(self, other):
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return type(other) is Dead
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def __repr__(self):
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return '<Dead>'
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_DEAD = Dead()
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def set_cloexec(fd):
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
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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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class Channel(object):
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def __init__(self, context, handle):
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self._context = context
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self._handle = handle
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self._queue = Queue.Queue()
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self._context.AddHandleCB(self._Receive, handle)
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def _Receive(self, data):
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"""Callback from the Stream; appends data to the internal queue."""
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IOLOG.debug('%r._Receive(%r)', self, data)
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self._queue.put(data)
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def Close(self):
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"""Indicate this channel is closed to the remote side."""
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IOLOG.debug('%r.Close()', self)
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self._context.Enqueue(self._handle, _DEAD)
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def Send(self, data):
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"""Send `data` to the remote."""
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IOLOG.debug('%r.Send(%r)', self, data)
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self._context.Enqueue(self._handle, data)
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def Receive(self, timeout=None):
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"""Receive an object from the remote, or return ``None`` if `timeout`
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is reached."""
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IOLOG.debug('%r.Receive(timeout=%r)', self, timeout)
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try:
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data = self._queue.get(True, timeout)
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except Queue.Empty:
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return
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IOLOG.debug('%r.Receive() got %r', self, data)
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if data == _DEAD:
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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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"""Iterate objects arriving on this channel, until the channel dies or
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is closed."""
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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 'Channel(%r, %r)' % (self._context, 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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self._lock = threading.RLock()
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self._present = {'econtext': ['econtext.utils', 'econtext.master']}
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self._ignore = []
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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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if fullname in self._ignore:
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return None
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pkgname, _, _ = fullname.rpartition('.')
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if fullname not in self._present.get(pkgname, (fullname,)):
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LOG.debug('%r: Skip %r since master doesnt know it', self, fullname)
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return None
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self._lock.acquire()
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try:
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self._ignore.append(fullname)
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try:
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__import__(fullname, fromlist=['*'])
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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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finally:
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self._ignore.pop()
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self._lock.release()
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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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is_pkg, present, path, data = ret
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mod = sys.modules.setdefault(fullname, imp.new_module(fullname))
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mod.__loader__ = self
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if is_pkg:
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mod.__path__ = []
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mod.__package__ = fullname
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self._present[fullname] = present
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else:
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mod.__package__ = fullname.rpartition('.')[0]
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code = compile(zlib.decompress(data), 'master:' + path, 'exec')
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exec code in mod.__dict__
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return mod
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class LogHandler(logging.Handler):
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def __init__(self, context):
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logging.Handler.__init__(self)
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self.context = context
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self.local = threading.local()
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def emit(self, rec):
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if rec.name == 'econtext.io' or \
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getattr(self.local, 'in_emit', False):
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return
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self.local.in_emit = True
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try:
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msg = self.format(rec)
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self.context.Enqueue(FORWARD_LOG, (rec.name, rec.levelno, msg))
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finally:
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self.local.in_emit = False
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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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_FindGlobal = None
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def Unpickle(self, data):
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"""Deserialize `data` into an object."""
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IOLOG.debug('%r.Unpickle(%r)', self, data)
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fp = cStringIO.StringIO(data)
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unpickler = cPickle.Unpickler(fp)
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if self._FindGlobal:
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unpickler.find_global = self._FindGlobal
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return unpickler.load()
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def Receive(self):
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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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IOLOG.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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while len(self._input_buf) >= 24 and self._ReceiveOne():
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pass
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def _ReceiveOne(self):
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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)-24 < msg_len:
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IOLOG.error('Input too short')
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return False
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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 bad MAC: %r != got %r; %r',
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self, msg_mac.encode('hex'),
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expected_mac.encode('hex'),
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self._input_buf[24:msg_len+24])
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try:
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handle, data = self.Unpickle(self._input_buf[24:msg_len+24])
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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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self._input_buf = self._input_buf[msg_len+24:]
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self._Invoke(handle, data)
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return True
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def _Invoke(self, handle, data):
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IOLOG.debug('%r._Invoke(): handle=%r; data=%r', self, handle, data)
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try:
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persist, fn = self._context._handle_map[handle]
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except KeyError:
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raise CorruptMessageError('%r: invalid handle: %r', self, handle)
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if not persist:
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del self._context._handle_map[handle]
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fn(data)
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def Transmit(self):
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"""Transmit buffered messages."""
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IOLOG.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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"""Enqueue `obj` to `handle`, and tell the broker we have output."""
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IOLOG.debug('%r.Enqueue(%r, %r)', self, handle, obj)
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self._lock.acquire()
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try:
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encoded = cPickle.dumps((handle, obj), protocol=2)
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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._lock.release()
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self._context.broker.UpdateStream(self)
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def Disconnect(self):
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"""Close our associated file descriptor and tell registered callbacks
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the connection has been destroyed."""
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LOG.debug('%r.Disconnect()', self)
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if self._context.stream is self:
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self._context.Disconnect()
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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(_DEAD)
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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.stream = self
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def Connect(self):
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"""Connect to a Broker at the address specified in our associated
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Context."""
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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 '%s(<context=%r>)' % (self.__class__.__name__, self._context)
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class Context(object):
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"""
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Represent a remote context regardless of connection method.
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"""
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stream = None
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remote_name = None
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def __init__(self, broker, name=None, hostname=None, username=None,
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key=None, 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.key = key or ('%016x' % random.getrandbits(128))
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self.parent_addr = parent_addr
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self._last_handle = 1000L
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self._handle_map = {}
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self._lock = threading.Lock()
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def Disconnect(self):
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self.stream = None
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LOG.debug('Parent stream is gone, dying.')
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self.broker.Finalize(wait=False)
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def AllocHandle(self):
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"""Allocate a handle."""
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self._lock.acquire()
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try:
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self._last_handle += 1L
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return self._last_handle
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finally:
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self._lock.release()
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def AddHandleCB(self, fn, handle, persist=True):
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"""Register `fn(obj)` to run for each `obj` sent to `handle`. If
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`persist` is ``False`` then unregister after one delivery."""
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IOLOG.debug('%r.AddHandleCB(%r, %r, persist=%r)',
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self, fn, handle, persist)
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self._handle_map[handle] = persist, fn
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def Enqueue(self, handle, obj):
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if self.stream:
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self.stream.Enqueue(handle, obj)
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def EnqueueAwaitReply(self, handle, deadline, data):
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"""Send `data` to `handle` and wait for a response with an optional
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timeout. The message contains `(reply_to, data)`, where `reply_to` is
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the handle on which this function expects its reply."""
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reply_to = self.AllocHandle()
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LOG.debug('%r.EnqueueAwaitReply(%r, %r, %r) -> reply handle %d',
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self, handle, deadline, data, reply_to)
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queue = Queue.Queue()
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def _Receive(data):
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IOLOG.debug('%r._Receive(%r)', self, data)
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queue.put(data)
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self.AddHandleCB(_Receive, reply_to, persist=False)
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self.stream.Enqueue(handle, (reply_to,) + data)
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try:
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data = queue.get(True, deadline)
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except Queue.Empty:
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self.stream.Disconnect()
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raise TimeoutError('deadline exceeded.')
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if data == _DEAD:
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raise StreamError('lost connection during call.')
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IOLOG.debug('%r._EnqueueAwaitReply(): got reply: %r', self, data)
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return data
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def CallWithDeadline(self, deadline, with_context, fn, *args, **kwargs):
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LOG.debug('%r.CallWithDeadline(%r, %r, %r, *%r, **%r)',
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self, deadline, with_context, fn, args, kwargs)
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if isinstance(fn, types.MethodType) and \
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isinstance(fn.im_self, (type, types.ClassType)):
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klass = fn.im_self.__name__
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else:
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klass = None
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call = (with_context, fn.__module__, klass, fn.__name__, args, kwargs)
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result = self.EnqueueAwaitReply(CALL_FUNCTION, deadline, call)
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if isinstance(result, CallError):
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raise result
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return result
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def Call(self, fn, *args, **kwargs):
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return self.CallWithDeadline(None, False, fn, *args, **kwargs)
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def __repr__(self):
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bits = filter(None, (self.name, self.hostname, self.username))
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return 'Context(%s)' % ', '.join(map(repr, bits))
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class Waker(BasicStream):
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def __init__(self, broker):
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self._broker = broker
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rfd, wfd = os.pipe()
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set_cloexec(rfd)
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set_cloexec(wfd)
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self.read_side = Side(self, rfd)
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self.write_side = Side(self, wfd)
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broker.UpdateStream(self)
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def __repr__(self):
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return '<Waker>'
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def Wake(self):
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os.write(self.write_side.fd, ' ')
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def Receive(self):
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os.read(self.read_side.fd, 1)
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class IoLogger(BasicStream):
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_buf = ''
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def __init__(self, broker, name, dest_fd):
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self._broker = broker
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self._name = name
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self._log = logging.getLogger(name)
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rfd, wfd = os.pipe()
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set_cloexec(rfd)
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os.dup2(wfd, dest_fd)
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os.close(wfd)
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self.read_side = Side(self, rfd)
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self.write_side = Side(self, dest_fd)
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self._broker.UpdateStream(self)
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def __repr__(self):
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return '<IoLogger %s fd %d>' % (self._name, self.read_side.fd)
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def _LogLines(self):
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while self._buf.find('\n') != -1:
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line, _, self._buf = self._buf.partition('\n')
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self._log.info('%s', line.rstrip('\n'))
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def Receive(self):
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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._buf += buf
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self._LogLines()
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|
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class Broker(object):
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"""
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Context broker: this is responsible for keeping track of contexts, any
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stream that is associated with them, and for I/O multiplexing.
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"""
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|
_waker = None
|
|
|
|
def __init__(self):
|
|
self._alive = True
|
|
self._lock = threading.Lock()
|
|
self._contexts = {}
|
|
self._readers = set()
|
|
self._writers = set()
|
|
self._waker = Waker(self)
|
|
|
|
self._thread = threading.Thread(target=self._BrokerMain,
|
|
name='econtext-broker')
|
|
self._thread.start()
|
|
|
|
def _UpdateStream(self, stream):
|
|
IOLOG.debug('_UpdateStream(%r)', stream)
|
|
self._lock.acquire()
|
|
try:
|
|
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)
|
|
finally:
|
|
self._lock.release()
|
|
|
|
def UpdateStream(self, stream):
|
|
self._UpdateStream(stream)
|
|
if self._waker:
|
|
self._waker.Wake()
|
|
|
|
def Register(self, context):
|
|
"""Put a context under control of this broker."""
|
|
LOG.debug('%r.Register(%r) -> r=%r w=%r', self, context,
|
|
context.stream.read_side,
|
|
context.stream.write_side)
|
|
self.UpdateStream(context.stream)
|
|
self._contexts[context.name] = context
|
|
return context
|
|
|
|
def _CallAndUpdate(self, stream, func):
|
|
try:
|
|
func()
|
|
except Exception:
|
|
LOG.exception('%r crashed', stream)
|
|
stream.Disconnect()
|
|
self._UpdateStream(stream)
|
|
|
|
def _LoopOnce(self):
|
|
IOLOG.debug('%r.Loop()', self)
|
|
# IOLOG.debug('readers = %r', [(r.fileno(), r) for r in self._readers])
|
|
# IOLOG.debug('writers = %r', [(w.fileno(), w) for w in self._writers])
|
|
rsides, wsides, _ = select.select(self._readers, self._writers, ())
|
|
for side in rsides:
|
|
IOLOG.debug('%r: POLLIN for %r', self, side.stream)
|
|
self._CallAndUpdate(side.stream, side.stream.Receive)
|
|
|
|
for side in wsides:
|
|
IOLOG.debug('%r: POLLOUT for %r', self, side.stream)
|
|
self._CallAndUpdate(side.stream, side.stream.Transmit)
|
|
|
|
def _BrokerMain(self):
|
|
"""Handle events until Finalize() is called."""
|
|
try:
|
|
while self._alive:
|
|
self._LoopOnce()
|
|
|
|
for context in self._contexts.itervalues():
|
|
if context.stream:
|
|
context.stream.Disconnect()
|
|
except Exception:
|
|
LOG.exception('Loop() crashed')
|
|
|
|
def Wait(self):
|
|
"""Wait for the broker to stop."""
|
|
self._thread.join()
|
|
|
|
def Finalize(self, wait=True):
|
|
"""Disconect all streams and wait for broker to stop."""
|
|
self._alive = False
|
|
self._waker.Wake()
|
|
if wait:
|
|
self.Wait()
|
|
|
|
def __repr__(self):
|
|
return 'Broker()'
|
|
|
|
|
|
class ExternalContext(object):
|
|
def _FixupMainModule(self):
|
|
main = sys.modules['__main__']
|
|
main.__path__ = []
|
|
main.core = main
|
|
|
|
sys.modules['econtext'] = main
|
|
sys.modules['econtext.core'] = main
|
|
for klass in globals().itervalues():
|
|
if hasattr(klass, '__module__'):
|
|
klass.__module__ = 'econtext.core'
|
|
|
|
def _ReapFirstStage(self):
|
|
os.wait()
|
|
os.dup2(100, 0)
|
|
os.close(100)
|
|
|
|
def _SetupMaster(self, key):
|
|
self.broker = Broker()
|
|
self.context = Context(self.broker, 'parent', key=key)
|
|
self.channel = Channel(self.context, CALL_FUNCTION)
|
|
self.context.stream = Stream(self.context)
|
|
self.context.stream.Accept(0, 1)
|
|
|
|
def _SetupLogging(self, log_level):
|
|
logging.basicConfig(level=log_level)
|
|
root = logging.getLogger()
|
|
root.setLevel(log_level)
|
|
root.handlers = [LogHandler(self.context)]
|
|
LOG.debug('Connected to %s', self.context)
|
|
|
|
def _SetupImporter(self):
|
|
self.importer = SlaveModuleImporter(self.context)
|
|
sys.meta_path.append(self.importer)
|
|
|
|
def _SetupStdio(self):
|
|
self.stdout_log = IoLogger(self.broker, 'stdout', 1)
|
|
self.stderr_log = IoLogger(self.broker, 'stderr', 2)
|
|
|
|
# Reopen with line buffering.
|
|
sys.stdout = open('/dev/stdout', 'w', 1)
|
|
|
|
fp = file('/dev/null')
|
|
try:
|
|
os.dup2(fp.fileno(), 0)
|
|
finally:
|
|
fp.close()
|
|
|
|
def _DispatchCalls(self):
|
|
for data in self.channel:
|
|
LOG.debug('_DispatchCalls(%r)', data)
|
|
reply_to, with_context, modname, klass, func, args, kwargs = data
|
|
if with_context:
|
|
args = (self,) + args
|
|
|
|
try:
|
|
obj = __import__(modname, fromlist=['*'])
|
|
if klass:
|
|
obj = getattr(obj, klass)
|
|
fn = getattr(obj, func)
|
|
self.context.Enqueue(reply_to, fn(*args, **kwargs))
|
|
except Exception, e:
|
|
self.context.Enqueue(reply_to, CallError(e))
|
|
|
|
def main(self, key, log_level):
|
|
self._ReapFirstStage()
|
|
self._FixupMainModule()
|
|
self._SetupMaster(key)
|
|
self._SetupLogging(log_level)
|
|
self._SetupImporter()
|
|
self._SetupStdio()
|
|
|
|
# signal.signal(signal.SIGINT, lambda *_: self.broker.Finalize())
|
|
self.broker.Register(self.context)
|
|
|
|
self._DispatchCalls()
|
|
self.broker.Wait()
|
|
LOG.debug('ExternalContext.main() exitting')
|