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723 lines
22 KiB
Python
723 lines
22 KiB
Python
"""
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This module implements most package functionality, but remains separate from
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non-essential code in order to reduce its size, since it is also serves as the
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bootstrap implementation sent to every new slave context.
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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 itertools
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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 zlib
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LOG = logging.getLogger('econtext')
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IOLOG = logging.getLogger('econtext.io')
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IOLOG.setLevel(logging.INFO)
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GET_MODULE = 100
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CALL_FUNCTION = 101
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FORWARD_LOG = 102
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|
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class Error(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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|
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class CallError(Error):
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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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Error.__init__(self, 'call failed: %s: %s\n%s', name, e, stack)
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class ChannelError(Error):
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"""Raised when a channel dies or has been closed."""
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class StreamError(Error):
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"""Raised when a stream cannot be established."""
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class TimeoutError(StreamError):
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"""Raised when a timeout occurs on a stream."""
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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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#: Sentinel value used to represent Channel disconnection.
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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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|
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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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|
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class Importer(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._present = {'econtext': ['econtext.utils', 'econtext.master']}
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self.tls = threading.local()
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def __repr__(self):
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return 'Importer()'
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def find_module(self, fullname, path=None):
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if hasattr(self.tls, 'running'):
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return None
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self.tls.running = True
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try:
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pkgname, _, _ = fullname.rpartition('.')
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LOG.debug('%r.find_module(%r)', self, fullname)
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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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pkg = sys.modules.get(pkgname)
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if pkg and getattr(pkg, '__loader__', None) is not self:
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LOG.debug('%r: %r is submodule of a package we did not load',
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self, fullname)
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return None
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try:
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__import__(fullname, {}, {}, [''])
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LOG.debug('%r: %r is available locally', self, fullname)
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except ImportError:
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LOG.debug('find_module(%r) returning self', fullname)
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return self
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finally:
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del self.tls.running
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def load_module(self, fullname):
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LOG.debug('Importer.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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os.close(self.fd)
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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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|
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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)
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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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|
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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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StreamError 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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|
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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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|
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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 StreamError('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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|
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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 StreamError('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(%r, %r)', self, handle, data)
|
|
try:
|
|
persist, fn = self._context._handle_map[handle]
|
|
except KeyError:
|
|
raise StreamError('%r: invalid handle: %r', self, handle)
|
|
|
|
if not persist:
|
|
del self._context._handle_map[handle]
|
|
|
|
try:
|
|
fn(data)
|
|
except Exception:
|
|
LOG.debug('%r._invoke(%r, %r): %r crashed', self, handle, data, fn)
|
|
|
|
def on_transmit(self):
|
|
"""Transmit buffered messages."""
|
|
IOLOG.debug('%r.on_transmit()', self)
|
|
written = os.write(self.write_side.fd, self._output_buf[:4096])
|
|
self._lock.acquire()
|
|
try:
|
|
self._output_buf = self._output_buf[written:]
|
|
finally:
|
|
self._lock.release()
|
|
if (not self._output_buf) and not self._context.broker.graceful_count:
|
|
self.on_disconnect()
|
|
|
|
def has_output(self):
|
|
return bool(self._output_buf)
|
|
|
|
def enqueue(self, handle, obj):
|
|
"""Enqueue `obj` to `handle`, and tell the broker we have output."""
|
|
IOLOG.debug('%r.enqueue(%r, %r)', self, handle, obj)
|
|
encoded = cPickle.dumps((handle, obj), protocol=2)
|
|
msg = struct.pack('>L', len(encoded)) + encoded
|
|
self._lock.acquire()
|
|
try:
|
|
self._whmac.update(msg)
|
|
self._output_buf += self._whmac.digest() + msg
|
|
finally:
|
|
self._lock.release()
|
|
self._context.broker.update_stream(self)
|
|
|
|
def on_disconnect(self):
|
|
super(Stream, self).on_disconnect()
|
|
if self._context.stream is self:
|
|
self._context.on_disconnect()
|
|
|
|
for handle, (persist, fn) in self._context._handle_map.iteritems():
|
|
LOG.debug('%r.on_disconnect(): killing %r: %r', self, handle, fn)
|
|
fn(_DEAD)
|
|
|
|
def on_shutdown(self):
|
|
"""Override BasicStream behaviour of immediately disconnecting."""
|
|
|
|
def accept(self, rfd, wfd):
|
|
self.read_side = Side(self, os.dup(rfd))
|
|
self.write_side = Side(self, os.dup(wfd))
|
|
set_cloexec(self.read_side.fd)
|
|
set_cloexec(self.write_side.fd)
|
|
self._context.stream = self
|
|
|
|
def connect(self):
|
|
"""Connect to a Broker at the address specified in our associated
|
|
Context."""
|
|
LOG.debug('%r.connect()', self)
|
|
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self.read_side = Side(self, sock.fileno())
|
|
self.write_side = Side(self, sock.fileno())
|
|
sock.connect(self._context.parent_addr)
|
|
self.enqueue(0, self._context.name)
|
|
|
|
def __repr__(self):
|
|
return '%s(<context=%r>)' % (self.__class__.__name__, self._context)
|
|
|
|
|
|
class Context(object):
|
|
"""
|
|
Represent a remote context regardless of connection method.
|
|
"""
|
|
stream = None
|
|
remote_name = None
|
|
|
|
def __init__(self, broker, name=None, hostname=None, username=None,
|
|
key=None, parent_addr=None):
|
|
self.broker = broker
|
|
self.name = name
|
|
self.hostname = hostname
|
|
self.username = username
|
|
self.key = key or ('%016x' % random.getrandbits(128))
|
|
self.parent_addr = parent_addr
|
|
self._last_handle = itertools.count(1000)
|
|
self._handle_map = {}
|
|
|
|
def on_shutdown(self):
|
|
"""Slave does nothing, _broker_main() will shutdown its streams."""
|
|
|
|
def on_disconnect(self):
|
|
self.stream = None
|
|
LOG.debug('Parent stream is gone, dying.')
|
|
self.broker.shutdown()
|
|
|
|
def alloc_handle(self):
|
|
"""Allocate a handle."""
|
|
return self._last_handle.next()
|
|
|
|
def add_handle_cb(self, fn, handle, persist=True):
|
|
"""Invoke `fn(obj)` for each `obj` sent to `handle`. Unregister after
|
|
one invocation if `persist` is ``False``."""
|
|
IOLOG.debug('%r.add_handle_cb(%r, %r, %r)', self, fn, handle, persist)
|
|
self._handle_map[handle] = persist, fn
|
|
|
|
def enqueue(self, handle, obj):
|
|
if self.stream:
|
|
self.stream.enqueue(handle, obj)
|
|
|
|
def enqueue_await_reply(self, handle, deadline, data):
|
|
"""Send `data` to `handle` and wait for a response with an optional
|
|
timeout. The message contains `(reply_to, data)`, where `reply_to` is
|
|
the handle on which this function expects its reply."""
|
|
reply_to = self.alloc_handle()
|
|
LOG.debug('%r.enqueue_await_reply(%r, %r, %r) -> reply handle %d',
|
|
self, handle, deadline, data, reply_to)
|
|
|
|
queue = Queue.Queue()
|
|
self.add_handle_cb(queue.put, reply_to, persist=False)
|
|
self.stream.enqueue(handle, (reply_to,) + data)
|
|
|
|
try:
|
|
data = queue.get(True, deadline)
|
|
except Queue.Empty:
|
|
self.stream.on_disconnect()
|
|
raise TimeoutError('deadline exceeded.')
|
|
|
|
if data == _DEAD:
|
|
raise StreamError('lost connection during call.')
|
|
|
|
IOLOG.debug('%r._enqueue_await_reply(): got reply: %r', self, data)
|
|
return data
|
|
|
|
def __repr__(self):
|
|
bits = filter(None, (self.name, self.hostname, self.username))
|
|
return 'Context(%s)' % ', '.join(map(repr, bits))
|
|
|
|
|
|
class Waker(BasicStream):
|
|
def __init__(self, broker):
|
|
self._broker = broker
|
|
rfd, wfd = os.pipe()
|
|
set_cloexec(rfd)
|
|
set_cloexec(wfd)
|
|
self.read_side = Side(self, rfd)
|
|
self.write_side = Side(self, wfd)
|
|
broker.update_stream(self)
|
|
|
|
def __repr__(self):
|
|
return '<Waker>'
|
|
|
|
def wake(self):
|
|
if self.write_side.fd:
|
|
os.write(self.write_side.fd, ' ')
|
|
|
|
def on_receive(self):
|
|
os.read(self.read_side.fd, 1)
|
|
|
|
|
|
class IoLogger(BasicStream):
|
|
_buf = ''
|
|
|
|
def __init__(self, broker, name, dest_fd):
|
|
self._broker = broker
|
|
self._name = name
|
|
self._log = logging.getLogger(name)
|
|
self._rsock, self._wsock = socket.socketpair()
|
|
|
|
os.dup2(self._wsock.fileno(), dest_fd)
|
|
set_cloexec(self._rsock.fileno())
|
|
set_cloexec(self._wsock.fileno())
|
|
|
|
self.read_side = Side(self, self._rsock.fileno())
|
|
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()
|
|
|
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class Broker(object):
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"""
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Broker: responsible for tracking contexts, associated streams, and I/O
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multiplexing.
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"""
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_waker = None
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graceful_count = 0
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graceful_timeout = 3.0
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def __init__(self):
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self._alive = True
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self._contexts = {}
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self._readers = set()
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self._writers = set()
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self._waker = Waker(self)
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self._thread = threading.Thread(target=self._broker_main,
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name='econtext-broker')
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self._thread.start()
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def _update_stream(self, stream):
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IOLOG.debug('_update_stream(%r)', stream)
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if stream.read_side.fd is not None:
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self._readers.add(stream.read_side)
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else:
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self._readers.discard(stream.read_side)
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if stream.write_side.fd is not None and stream.has_output():
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self._writers.add(stream.write_side)
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else:
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self._writers.discard(stream.write_side)
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def update_stream(self, stream):
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self._update_stream(stream)
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if self._waker:
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self._waker.wake()
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def register(self, context):
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"""Put a context under control of this broker."""
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LOG.debug('%r.register(%r) -> r=%r w=%r', self, context,
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context.stream.read_side,
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context.stream.write_side)
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self.update_stream(context.stream)
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self._contexts[context.name] = context
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return context
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def _call_and_update(self, stream, func):
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try:
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func()
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except Exception:
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LOG.exception('%r crashed', stream)
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stream.on_disconnect()
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self._update_stream(stream)
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def _loop_once(self, timeout=None):
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IOLOG.debug('%r._loop_once(%r)', self, timeout)
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#IOLOG.debug('readers = %r', [(r.fileno(), r) for r in self._readers])
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#IOLOG.debug('writers = %r', [(w.fileno(), w) for w in self._writers])
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rsides, wsides, _ = select.select(self._readers, self._writers,
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(), timeout)
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for side in rsides:
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IOLOG.debug('%r: POLLIN for %r', self, side.stream)
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self._call_and_update(side.stream, side.stream.on_receive)
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for side in wsides:
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IOLOG.debug('%r: POLLOUT for %r', self, side.stream)
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self._call_and_update(side.stream, side.stream.on_transmit)
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def _broker_main(self):
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"""Handle events until shutdown()."""
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try:
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while self._alive:
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self._loop_once()
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for side in self._readers | self._writers:
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self._call_and_update(side.stream, side.stream.on_shutdown)
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deadline = time.time() + self.graceful_timeout
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while ((self._readers or self._writers) and
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(self.graceful_count or time.time() < deadline)):
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self._loop_once(1.0)
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for context in self._contexts.itervalues():
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stream = context.stream
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if stream:
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stream.on_disconnect()
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self._update_stream(stream)
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for side in self._readers | self._writers:
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LOG.error('_broker_main() force disconnecting %r', side)
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side.stream.on_disconnect()
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except Exception:
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LOG.exception('_broker_main() crashed')
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def shutdown(self):
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"""Request broker gracefully disconnect streams and stop."""
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LOG.debug('%r.shutdown()', self)
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self._alive = False
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self._waker.wake()
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def join(self):
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"""Wait for the broker to stop."""
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self._thread.join()
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def __repr__(self):
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return 'Broker()'
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class ExternalContext(object):
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def _setup_master(self, key):
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self.broker = Broker()
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self.context = Context(self.broker, 'master', key=key)
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self.channel = Channel(self.context, CALL_FUNCTION)
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self.context.stream = Stream(self.context)
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self.context.stream.accept(100, 1)
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os.wait() # Reap first stage.
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os.close(100)
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def _setup_logging(self, log_level):
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logging.basicConfig(level=log_level)
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root = logging.getLogger()
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root.setLevel(log_level)
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root.handlers = [LogHandler(self.context)]
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LOG.debug('Connected to %s', self.context)
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def _setup_importer(self):
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self.importer = Importer(self.context)
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sys.meta_path.append(self.importer)
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def _setup_package(self):
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econtext = imp.new_module('econtext')
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econtext.__package__ = 'econtext'
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econtext.__path__ = []
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econtext.__loader__ = self.importer
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econtext.slave = True
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econtext.core = sys.modules['__main__']
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del sys.modules['__main__']
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sys.modules['econtext'] = econtext
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sys.modules['econtext.core'] = econtext.core
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for klass in vars(econtext.core).itervalues():
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if hasattr(klass, '__module__'):
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klass.__module__ = 'econtext.core'
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def _setup_stdio(self):
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self.stdout_log = IoLogger(self.broker, 'stdout', 1)
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self.stderr_log = IoLogger(self.broker, 'stderr', 2)
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# Reopen with line buffering.
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sys.stdout = os.fdopen(1, 'w', 1)
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fp = file('/dev/null')
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try:
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os.dup2(fp.fileno(), 0)
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finally:
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fp.close()
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def _dispatch_calls(self):
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for data in self.channel:
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LOG.debug('_dispatch_calls(%r)', data)
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reply_to, with_context, modname, klass, func, args, kwargs = data
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if with_context:
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args = (self,) + args
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try:
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obj = __import__(modname, {}, {}, [''])
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if klass:
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obj = getattr(obj, klass)
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fn = getattr(obj, func)
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self.context.enqueue(reply_to, fn(*args, **kwargs))
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except Exception, e:
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self.context.enqueue(reply_to, CallError(e))
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def main(self, key, log_level):
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self._setup_master(key)
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try:
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self._setup_logging(log_level)
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self._setup_importer()
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self._setup_package()
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self._setup_stdio()
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self.broker.register(self.context)
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self._dispatch_calls()
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LOG.debug('ExternalContext.main() exitting')
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finally:
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self.broker.shutdown()
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self.broker.join()
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