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759 lines
23 KiB
Python
759 lines
23 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 errno
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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 time
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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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SHUTDOWN = 103L
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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.add_handle_cb(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, or ``None`` if `timeout` is reached."""
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IOLOG.debug('%r.on_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.on_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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"""Yield objects from this channel until it 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: master doesn\'t know %r', 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.enqueue_await_reply(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 vars(mod)
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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 '<Side of %r fd %s>' % (self.stream, self.fd)
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def fileno(self):
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if self.fd is None:
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raise StreamError('%r.fileno() called but no FD set', self)
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return self.fd
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def close(self):
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if self.fd is not None:
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IOLOG.debug('%r.close()', 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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if e.errno != errno.EBADF:
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LOG.error('%r: close failed', self, e)
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self.fd = None
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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 on_disconnect(self):
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"""Close our associated descriptors."""
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LOG.debug('%r.on_disconnect()', self)
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self.read_side.close()
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self.write_side.close()
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def on_shutdown(self):
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"""Disconnect gracefully. Base implementation calls on_disconnect()."""
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LOG.debug('%r.on_shutdown()', self)
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self.on_disconnect()
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def has_output(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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_find_global = 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._find_global:
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unpickler.find_global = self._find_global
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return unpickler.load()
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def on_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.on_receive()', self)
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buf = os.read(self.read_side.fd, 4096)
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self._input_buf += buf
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while self._receive_one():
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pass
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if not buf:
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return self.on_disconnect()
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def _receive_one(self):
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if len(self._input_buf) < 24:
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return False
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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.debug('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('bad MAC: %r != got %r; %r',
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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('invalid message: %s', 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 on_transmit(self):
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"""Transmit buffered messages."""
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IOLOG.debug('%r.on_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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if (not self._output_buf) and not self._context.broker.graceful_count:
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self.on_disconnect()
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def has_output(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.update_stream(self)
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def on_disconnect(self):
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super(Stream, self).on_disconnect()
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if self._context.stream is self:
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self._context.on_disconnect()
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for handle, (persist, fn) in self._context._handle_map.iteritems():
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LOG.debug('%r.on_disconnect(): killing %r: %r', self, handle, fn)
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fn(_DEAD)
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def on_shutdown(self):
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"""Override BasicStream behaviour of immediately disconnecting."""
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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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set_cloexec(self.read_side.fd)
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set_cloexec(self.write_side.fd)
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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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self.add_handle_cb(self._shutdown, SHUTDOWN)
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def on_shutdown(self):
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"""Slave does nothing, _broker_main() will shutdown its streams."""
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def _shutdown(self, data):
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if data != _DEAD and self.stream:
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LOG.debug('Received SHUTDOWN')
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self.broker.shutdown()
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def on_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.shutdown()
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def alloc_handle(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 add_handle_cb(self, fn, handle, persist=True):
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"""Invoke `fn(obj)` for each `obj` sent to `handle`. Unregister after
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one invocation if `persist` is ``False``."""
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IOLOG.debug('%r.add_handle_cb(%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 enqueue_await_reply(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.alloc_handle()
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LOG.debug('%r.enqueue_await_reply(%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 _put_reply(data):
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IOLOG.debug('%r._put_reply(%r)', self, data)
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queue.put(data)
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self.add_handle_cb(_put_reply, 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.on_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._enqueue_await_reply(): got reply: %r', self, data)
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return data
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def call_with_deadline(self, deadline, with_context, fn, *args, **kwargs):
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LOG.debug('%r.call_with_deadline(%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.enqueue_await_reply(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.call_with_deadline(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.update_stream(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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if self.write_side.fd:
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os.write(self.write_side.fd, ' ')
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def on_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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self._rsock, self._wsock = socket.socketpair()
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os.dup2(self._wsock.fileno(), dest_fd)
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set_cloexec(self._rsock.fileno())
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set_cloexec(self._wsock.fileno())
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self.read_side = Side(self, self._rsock.fileno())
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self.write_side = Side(self, dest_fd)
|
|
broker.graceful_count += 1
|
|
self._broker.update_stream(self)
|
|
|
|
def __repr__(self):
|
|
return '<IoLogger %s fd %d>' % (self._name, self.read_side.fd)
|
|
|
|
def _log_lines(self):
|
|
while self._buf.find('\n') != -1:
|
|
line, _, self._buf = self._buf.partition('\n')
|
|
self._log.info('%s', line.rstrip('\n'))
|
|
|
|
def on_shutdown(self):
|
|
LOG.debug('%r.on_shutdown()', self)
|
|
self._wsock.shutdown(socket.SHUT_WR)
|
|
self._wsock.close()
|
|
|
|
def on_receive(self):
|
|
LOG.debug('%r.on_receive()', self)
|
|
buf = os.read(self.read_side.fd, 4096)
|
|
if not buf:
|
|
LOG.debug('%r decrement graceful_count', self)
|
|
self._broker.graceful_count -= 1
|
|
return self.on_disconnect()
|
|
|
|
self._buf += buf
|
|
self._log_lines()
|
|
|
|
|
|
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.
|
|
"""
|
|
_waker = None
|
|
graceful_count = 0
|
|
graceful_timeout = 3.0
|
|
|
|
def __init__(self):
|
|
self._alive = True
|
|
self._lock = threading.RLock()
|
|
self._contexts = {}
|
|
self._readers = set()
|
|
self._writers = set()
|
|
self._waker = Waker(self)
|
|
|
|
self._thread = threading.Thread(target=self._broker_main,
|
|
name='econtext-broker')
|
|
self._thread.start()
|
|
|
|
def _update_stream(self, stream):
|
|
IOLOG.debug('_update_stream(%r)', stream)
|
|
self._lock.acquire()
|
|
try:
|
|
if stream.read_side.fd is not None:
|
|
self._readers.add(stream.read_side)
|
|
else:
|
|
self._readers.discard(stream.read_side)
|
|
|
|
if stream.write_side.fd is not None and stream.has_output():
|
|
self._writers.add(stream.write_side)
|
|
else:
|
|
self._writers.discard(stream.write_side)
|
|
finally:
|
|
self._lock.release()
|
|
|
|
def update_stream(self, stream):
|
|
self._update_stream(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.update_stream(context.stream)
|
|
self._contexts[context.name] = context
|
|
return context
|
|
|
|
def _call_and_update(self, stream, func):
|
|
try:
|
|
func()
|
|
except Exception:
|
|
LOG.exception('%r crashed', stream)
|
|
stream.on_disconnect()
|
|
self._update_stream(stream)
|
|
|
|
def _loop_once(self, timeout=None):
|
|
IOLOG.debug('%r._loop_once(%r)', self, timeout)
|
|
#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,
|
|
(), timeout)
|
|
for side in rsides:
|
|
IOLOG.debug('%r: POLLIN for %r', self, side.stream)
|
|
self._call_and_update(side.stream, side.stream.on_receive)
|
|
|
|
for side in wsides:
|
|
IOLOG.debug('%r: POLLOUT for %r', self, side.stream)
|
|
self._call_and_update(side.stream, side.stream.on_transmit)
|
|
|
|
def _broker_main(self):
|
|
"""Handle events until shutdown()."""
|
|
try:
|
|
while self._alive:
|
|
self._loop_once()
|
|
|
|
for side in self._readers | self._writers:
|
|
self._call_and_update(side.stream, side.stream.on_shutdown)
|
|
|
|
deadline = time.time() + self.graceful_timeout
|
|
while ((self._readers or self._writers) and
|
|
(self.graceful_count or time.time() < deadline)):
|
|
self._loop_once(1.0)
|
|
|
|
for context in self._contexts.itervalues():
|
|
stream = context.stream
|
|
if stream:
|
|
stream.on_disconnect()
|
|
self._update_stream(stream)
|
|
|
|
for side in self._readers | self._writers:
|
|
LOG.error('_broker_main() force disconnecting %r', side)
|
|
side.stream.on_disconnect()
|
|
except Exception:
|
|
LOG.exception('_broker_main() crashed')
|
|
|
|
def shutdown(self):
|
|
"""Request broker gracefully disconnect streams and stop."""
|
|
LOG.debug('%r.shutdown()', self)
|
|
self._alive = False
|
|
self._waker.wake()
|
|
|
|
def wait(self):
|
|
"""Wait for the broker to stop."""
|
|
self._thread.join()
|
|
|
|
def __repr__(self):
|
|
return 'Broker()'
|
|
|
|
|
|
class ExternalContext(object):
|
|
def _fixup_package(self):
|
|
econtext = imp.new_module('econtext')
|
|
econtext.__package__ = 'econtext'
|
|
econtext.__path__ = []
|
|
econtext.core = sys.modules['__main__']
|
|
|
|
sys.modules['econtext'] = econtext
|
|
sys.modules['econtext.core'] = econtext.core
|
|
exec 'from econtext.core import *' in vars(econtext)
|
|
|
|
for klass in vars(econtext.core).itervalues():
|
|
if hasattr(klass, '__module__'):
|
|
klass.__module__ = 'econtext.core'
|
|
|
|
def _reap_first_stage(self):
|
|
os.wait()
|
|
os.dup2(100, 0)
|
|
os.close(100)
|
|
|
|
def _setup_master(self, key):
|
|
self.broker = Broker()
|
|
self.context = Context(self.broker, 'master', key=key)
|
|
self.channel = Channel(self.context, CALL_FUNCTION)
|
|
self.context.stream = Stream(self.context)
|
|
self.context.stream.accept(0, 1)
|
|
|
|
def _setup_logging(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 _setup_importer(self):
|
|
self.importer = SlaveModuleImporter(self.context)
|
|
sys.meta_path.append(self.importer)
|
|
|
|
def _setup_stdio(self):
|
|
self.stdout_log = IoLogger(self.broker, 'stdout', 1)
|
|
self.stderr_log = IoLogger(self.broker, 'stderr', 2)
|
|
# Reopen with line buffering.
|
|
sys.stdout = os.fdopen(1, 'w', 1)
|
|
|
|
fp = file('/dev/null')
|
|
try:
|
|
os.dup2(fp.fileno(), 0)
|
|
finally:
|
|
fp.close()
|
|
|
|
def _dispatch_calls(self):
|
|
for data in self.channel:
|
|
LOG.debug('_dispatch_calls(%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._reap_first_stage()
|
|
self._fixup_package()
|
|
self._setup_master(key)
|
|
try:
|
|
self._setup_logging(log_level)
|
|
self._setup_importer()
|
|
self._setup_stdio()
|
|
|
|
self.broker.register(self.context)
|
|
self._dispatch_calls()
|
|
self.broker.wait()
|
|
LOG.debug('ExternalContext.main() exitting')
|
|
finally:
|
|
self.broker.shutdown()
|