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gevent_zerorpc.py
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932 lines (748 loc) · 28.6 KB
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# -*- coding: utf-8 -*-
# Started by François-Xavier Bourlet <[email protected]>, Nov 2011.
import inspect
import msgpack
import uuid
import time
import sys
import traceback
import gevent.pool
import gevent.queue
import gevent.event
import gevent.local
import gevent.coros
import gevent_zmq as zmq
class LostRemote(Exception):
pass
class TimeoutExpired(Exception):
def __init__(self, timeout_s, when=None):
msg = 'timeout after {0}s'
if when:
msg = '{0}, when {1}'.format(msg, when)
super(TimeoutExpired, self).__init__(msg)
class RemoteError(Exception):
def __init__(self, name, human_msg, human_traceback):
self.name = name
self.msg = human_msg
self.traceback = human_traceback
def __str__(self):
if self.traceback is not None:
return self.traceback
return '{0}: {1}'.format(self.name, self.msg)
class Context(zmq.Context):
_instance = None
def __init__(self):
self._middlewares = []
self._middlewares_hooks = {
'resolve_endpoint': [],
'raise_error': []
}
@staticmethod
def get_instance():
if Context._instance is None:
Context._instance = Context()
return Context._instance
def new_msgid(self):
return str(uuid.uuid4())
def register_middleware(self, middleware_instance):
registered_count = 0
self._middlewares.append(middleware_instance)
for hook in self._middlewares_hooks.keys():
functor = getattr(middleware_instance, hook, None)
if functor is None:
try:
functor = middleware_instance.get(hook, None)
except AttributeError:
pass
if functor is not None:
self._middlewares_hooks[hook].append(functor)
registered_count += 1
return registered_count
def middleware_resolve_endpoint(self, endpoint):
for functor in self._middlewares_hooks['resolve_endpoint']:
endpoint = functor(endpoint)
return endpoint
def middleware_raise_error(self, event):
for functor in self._middlewares_hooks['raise_error']:
functor(event)
class Event(object):
def __init__(self, name, args, context, header=None):
self._name = name
self._args = args
if header is None:
context = context or Context.get_instance()
self._header = {
'message_id': context.new_msgid(),
'v': 2
}
else:
self._header = header
@property
def header(self):
return self._header
@property
def name(self):
return self._name
@property
def args(self):
return self._args
def pack(self):
return msgpack.Packer().pack((self._header, self._name, self._args))
@staticmethod
def unpack(blob):
unpacker = msgpack.Unpacker()
unpacker.feed(blob)
(header, name, args) = unpacker.unpack()
# Backward compatibility
if not isinstance(header, dict):
header = {}
return Event(name, args, None, header)
def __str__(self, ignore_args=False):
if ignore_args:
args = '[...]'
else:
args = self._args
try:
args = '<<{0}>>'.format(str(self.unpack(self._args)))
except:
pass
return '{0} {1} {2}'.format(self._name, self._header,
args)
class Sender(object):
def __init__(self, socket):
self._socket = socket
self._send_queue = gevent.queue.Queue(maxsize=0)
self._send_task = gevent.spawn(self._sender)
def __del__(self):
self.close()
def close(self):
if self._send_task:
self._send_queue.kill()
def _sender(self):
running = True
for parts in self._send_queue:
for i in xrange(len(parts) - 1):
try:
self._socket.send(parts[i], flags=zmq.SNDMORE)
except gevent.GreenletExit:
if i == 0:
return
running = False
self._socket.send(parts[i], flags=zmq.SNDMORE)
self._socket.send(parts[-1])
if not running:
return
def __call__(self, parts):
self._send_queue.put(parts)
class Receiver(object):
def __init__(self, socket):
self._socket = socket
self._recv_queue = gevent.queue.Queue(maxsize=0)
self._recv_task = gevent.spawn(self._recver)
def __del__(self):
self.close()
def close(self):
if self._recv_task:
self._recv_task.kill()
def _recver(self):
running = True
while True:
parts = []
while True:
try:
part = self._socket.recv()
except gevent.GreenletExit:
running = False
if len(parts) == 0:
return
part = self._socket.recv()
parts.append(part)
if not self._socket.getsockopt(zmq.RCVMORE):
break
if not running:
break
self._recv_queue.put(parts)
def __call__(self):
return self._recv_queue.get()
class Events(object):
def __init__(self, zmq_socket_type, context=None):
self._zmq_socket_type = zmq_socket_type
self._context = context or Context.get_instance()
self._socket = zmq.Socket(self._context, zmq_socket_type)
self._send = self._socket.send_multipart
self._recv = self._socket.recv_multipart
if zmq_socket_type in (zmq.PUSH, zmq.PUB, zmq.XREQ, zmq.XREP):
self._send = Sender(self._socket)
if zmq_socket_type in (zmq.PULL, zmq.SUB, zmq.XREQ, zmq.XREP):
self._recv = Receiver(self._socket)
@property
def recv_is_available(self):
return self._zmq_socket_type in (zmq.PULL, zmq.SUB, zmq.XREQ, zmq.XREP)
def __del__(self):
if not self._socket.closed:
self.close()
def close(self):
try:
self._send.close()
except AttributeError:
pass
try:
self._recv.close()
except AttributeError:
pass
self._socket.close()
def _resolve_endpoint(self, endpoint, resolve=True):
if resolve:
endpoint = self._context.middleware_resolve_endpoint(endpoint)
if isinstance(endpoint, (tuple, list)):
r = []
for sub_endpoint in endpoint:
r.extend(self._resolve_endpoint(sub_endpoint, resolve))
return r
return [endpoint]
def connect(self, endpoint, resolve=True):
r = []
for endpoint_ in self._resolve_endpoint(endpoint, resolve):
r.append(self._socket.connect(endpoint_))
return r
def bind(self, endpoint, resolve=True):
r = []
for endpoint_ in self._resolve_endpoint(endpoint, resolve):
r.append(self._socket.bind(endpoint_))
return r
def create_event(self, name, args, xheader={}):
event = Event(name, args, context=self._context)
for k, v in xheader.items():
if k == 'zmqid':
continue
event.header[k] = v
return event
def emit_event(self, event, identity=None):
if identity is not None:
parts = list(identity)
parts.extend(['', event.pack()])
elif self._zmq_socket_type in (zmq.XREQ, zmq.XREP):
parts = ('', event.pack())
else:
parts = (event.pack(),)
self._send(parts)
def emit(self, name, args, xheader={}):
event = self.create_event(name, args, xheader)
identity = xheader.get('zmqid', None)
return self.emit_event(event, identity)
def recv(self):
parts = self._recv()
if len(parts) == 1:
identity = None
blob = parts[0]
else:
identity = parts[0:-2]
blob = parts[-1]
event = Event.unpack(blob)
if identity is not None:
event.header['zmqid'] = identity
return event
def setsockopt(self, *args):
return self._socket.setsockopt(*args)
class ChannelMultiplexer(object):
def __init__(self, events, ignore_broadcast=False):
self._events = events
self._active_channels = {}
self._channel_dispatcher_task = None
self._broadcast_queue = None
if events.recv_is_available and not ignore_broadcast:
self._broadcast_queue = gevent.queue.Queue(maxsize=1)
self._channel_dispatcher_task = gevent.spawn(self._channel_dispatcher)
@property
def recv_is_available(self):
return self._events.recv_is_available
def __del__(self):
self.close()
def close(self):
if self._channel_dispatcher_task:
self._channel_dispatcher_task.kill()
def create_event(self, name, args, xheader={}):
return self._events.create_event(name, args, xheader)
def emit_event(self, event, identity=None):
return self._events.emit_event(event, identity)
def emit(self, name, args, xheader={}):
return self._events.emit(name, args, xheader)
def recv(self):
if self._broadcast_queue is not None:
event = self._broadcast_queue.get()
else:
event = self._events.recv()
return event
def _channel_dispatcher(self):
while True:
event = self._events.recv()
channel_id = event.header.get('response_to', None)
queue = None
if channel_id is not None:
channel = self._active_channels.get(channel_id, None)
if channel is not None:
queue = channel._queue
elif self._broadcast_queue is not None:
queue = self._broadcast_queue
if queue is None:
print >> sys.stderr, \
'zerorpc.ChannelMultiplexer, ', \
'unable to route event:', \
event.__str__(ignore_args=True)
else:
queue.put(event)
def channel(self, from_event=None):
if self._channel_dispatcher_task is None:
self._channel_dispatcher_task = gevent.spawn(self._channel_dispatcher)
return Channel(self, from_event)
@property
def active_channels(self):
return self._active_channels
class Channel(object):
def __init__(self, multiplexer, from_event=None):
self._multiplexer = multiplexer
self._channel_id = None
self._zmqid = None
self._queue = gevent.queue.Queue(maxsize=1)
if from_event is not None:
self._channel_id = from_event.header['message_id']
self._zmqid = from_event.header.get('zmqid', None)
self._multiplexer._active_channels[self._channel_id] = self
self._queue.put(from_event)
@property
def recv_is_available(self):
return self._multiplexer.recv_is_available
def __del__(self):
self.close()
def close(self):
if self._channel_id is not None:
del self._multiplexer._active_channels[self._channel_id]
self._channel_id = None
def emit(self, name, args, xheader={}):
event = self._multiplexer.create_event(name, args, xheader)
if self._channel_id is None:
self._channel_id = event.header['message_id']
self._multiplexer._active_channels[self._channel_id] = self
else:
event.header['response_to'] = self._channel_id
# TODO debug middleware
# print time.time(), 'channel emit', event
self._multiplexer.emit_event(event, self._zmqid)
def recv(self, timeout=None):
try:
event = self._queue.get(timeout=timeout)
except gevent.queue.Empty:
raise TimeoutExpired(timeout)
# TODO debug middleware
# print time.time(), 'channel recv', event
return event
class WrappedEvents(object):
def __init__(self, channel):
self._channel = channel
@property
def recv_is_available(self):
return self._channel.recv_is_available
def create_event(self, name, args, xheader={}):
wrapped_event = Event(name, args, None)
wrapped_event.header.update(xheader)
return wrapped_event
def emit_event(self, event, identity=None):
return self._channel.emit('w', event.pack())
def emit(self, name, args, xheader={}):
wrapped_event = self.create_event(name, args, xheader)
return self._channel.emit('w', wrapped_event.pack())
def recv(self, timeout=None):
event = self._channel.recv()
wrapped_event = Event.unpack(event.args)
return wrapped_event
class SocketOnChannel(object):
def __init__(self, channel, heartbeat=5, inqueue_size=100,
passive_heartbeat=False):
self._channel = channel
self._heartbeat_freq = heartbeat
self._input_queue_size = inqueue_size
self._remote_queue_open_slots = 1
self._input_queue_reserved = 1
self._remote_last_hb = None
self._remote_can_recv = gevent.event.Event()
self._input_queue = gevent.queue.Queue()
self._lost_remote = False
self._aggressive_heartbeat = False
self._recv_task = gevent.spawn(self._recver)
self._parent_coroutine = None
self._heartbeat_task = None
if not passive_heartbeat:
self._start_heartbeat()
def __del__(self):
self.close()
def close(self):
if self._heartbeat_task:
self._heartbeat_task.kill()
if self._recv_task:
self._recv_task.kill()
def _emit_heartbeat(self):
open_slots = self._input_queue_size - self._input_queue_reserved
self._input_queue_reserved += open_slots
self._channel.emit('_zpc_hb', (open_slots,))
def _heartbeat(self):
while True:
gevent.sleep(self._heartbeat_freq)
if self._remote_last_hb is None:
self._remote_last_hb = time.time()
if time.time() > self._remote_last_hb + self._heartbeat_freq * 2:
self._lost_remote = True
gevent.kill(self._parent_coroutine,
self._lost_remote_exception())
break
self._emit_heartbeat()
def _start_heartbeat(self):
if self._heartbeat_task is None and self._heartbeat_freq is not None:
self._parent_coroutine = gevent.getcurrent()
self._heartbeat_task = gevent.spawn(self._heartbeat)
def _recver(self):
while True:
event = self._channel.recv()
if event.name == '_zpc_hb':
self._remote_last_hb = time.time()
self._start_heartbeat()
try:
self._remote_queue_open_slots += int(event.args[0])
except Exception as e:
print >> sys.stderr, \
'gevent_zerorpc.SocketOnChannel._recver,', \
'exception:', e
if self._remote_queue_open_slots > 0:
self._remote_can_recv.set()
elif self._input_queue.qsize() == self._input_queue_size:
raise RuntimeError(
'SocketOnChannel, queue overflow on event:', event)
else:
self._input_queue.put(event)
def emit(self, name, args, xheader={}, block=True, timeout=None):
if self._lost_remote:
raise self._lost_remote_exception()
if self._remote_queue_open_slots == 0:
if not block:
return False
self._remote_can_recv.clear()
self._remote_can_recv.wait(timeout=timeout)
self._remote_queue_open_slots -= 1
try:
self._channel.emit(name, args, xheader)
except:
self._remote_queue_open_slots += 1
raise
return True
def _lost_remote_exception(self):
return LostRemote('Lost remote after {0}s heartbeat'.format(
self._heartbeat_freq * 2))
def recv(self, timeout=None):
if self._lost_remote:
raise self._lost_remote_exception()
if self._aggressive_heartbeat:
self._start_heartbeat()
if self._input_queue_reserved < self._input_queue_size / 2:
self._emit_heartbeat()
else:
self._aggressive_heartbeat = True
try:
event = self._input_queue.get(timeout=timeout)
except gevent.queue.Empty:
raise TimeoutExpired(timeout)
self._input_queue_reserved -= 1
return event
@property
def channel(self):
return self._channel
class SocketBase(object):
def __init__(self, zmq_socket_type, context=None):
self._context = context or Context.get_instance()
self._events = Events(zmq_socket_type, context)
def __del__(self):
self.close()
def close(self):
self._events.close()
def connect(self, endpoint, resolve=True):
return self._events.connect(endpoint, resolve)
def bind(self, endpoint, resolve=True):
return self._events.bind(endpoint, resolve)
class DecoratorBase(object):
pattern = None
def __init__(self, functor):
self._functor = functor
self.__doc__ = functor.__doc__
self.__name__ = functor.__name__
def __get__(self, instance, type_instance=None):
if instance is None:
return self
return self.__class__(self._functor.__get__(instance, type_instance))
def __call__(self, *args, **kargs):
return self._functor(*args, **kargs)
def _zerorpc_args(self):
try:
args_spec = self._functor._zerorpc_args()
except AttributeError:
try:
args_spec = inspect.getargspec(self._functor)
except TypeError:
try:
args_spec = inspect.getargspec(self._functor.__call__)
except (AttributeError, TypeError):
args_spec = None
return args_spec
class PatternReqRep():
def process_call(self, socket, event, functor):
result = functor(*event.args)
socket.emit('OK', (result,))
def accept_answer(self, event):
return True
def process_answer(self, socket, event, method, timeout,
raise_remote_error):
result = event.args[0]
if event.name == 'ERR':
raise_remote_error(event)
socket.close()
socket.channel.close()
return result
class rep(DecoratorBase):
pattern = PatternReqRep()
class PatternReqStream():
def process_call(self, socket, event, functor):
for result in iter(functor(*event.args)):
socket.emit('STREAM', result)
socket.emit('STREAM_DONE', None)
def accept_answer(self, event):
return event.name in ('STREAM', 'STREAM_DONE')
def process_answer(self, socket, event, method, timeout,
raise_remote_error):
def iterator(event):
while event.name == 'STREAM':
yield event.args
event = socket.recv()
if event.name == 'ERR':
raise_remote_error(event)
socket.close()
socket.channel.close()
return iterator(event)
class stream(DecoratorBase):
pattern = PatternReqStream()
class Server(SocketBase):
def __init__(self, methods=None, name=None, context=None, pool_size=None,
heartbeat=5):
super(Server, self).__init__(zmq.XREP, context)
self._multiplexer = ChannelMultiplexer(self._events)
if methods is None:
methods = self
self._name = name or repr(methods)
self._task_pool = gevent.pool.Pool(size=pool_size)
self._acceptor_task = None
if hasattr(methods, '__getitem__'):
self._methods = methods
else:
server_methods = set(getattr(self, k) for k in dir(Server) if not
k.startswith('_'))
self._methods = dict((k, getattr(methods, k))
for k in dir(methods)
if callable(getattr(methods, k))
and not k.startswith('_')
and getattr(methods, k) not in server_methods
)
self._inject_builtins()
self._heartbeat_freq = heartbeat
for (k, functor) in self._methods.items():
if not isinstance(functor, DecoratorBase):
self._methods[k] = rep(functor)
def __del__(self):
self.close()
super(Server, self).__del__()
def close(self):
self.stop()
self._multiplexer.close()
super(Server, self).close()
def _zerorpc_inspect(self, method=None, long_doc=True):
if method:
methods = { method: self._methods[method] }
else:
methods = dict((m, f) for m, f in self._methods.items()
if not m.startswith('_'))
detailled_methods = [ (m, f._zerorpc_args(),
f.__doc__ if long_doc else
f.__doc__.split('\n', 1)[0] if f.__doc__ else None)
for (m, f) in methods.items() ]
return { 'name': self._name,
'methods': detailled_methods }
def _inject_builtins(self):
self._methods['_zerorpc_list'] = lambda: [m for m in self._methods
if not m.startswith('_')]
self._methods['_zerorpc_name'] = lambda: self._name
self._methods['_zerorpc_ping'] = lambda: ['pong', self._name]
self._methods['_zerorpc_help'] = lambda m: self._methods[m].__doc__
self._methods['_zerorpc_args'] = lambda m: self._methods[m]._zerorpc_args()
self._methods['_zerorpc_inspect'] = self._zerorpc_inspect
def __call__(self, method, *args):
if method not in self._methods:
raise NameError(method)
return self._methods[method](*args)
def _async_task(self, initial_event):
protocol_v2 = initial_event.header.get('v', 1) >= 2
channel = self._multiplexer.channel(initial_event)
socket = SocketOnChannel(channel, heartbeat=self._heartbeat_freq,
passive_heartbeat=not protocol_v2)
event = socket.recv()
try:
functor = self._methods.get(event.name, None)
if functor is None:
raise NameError(event.name)
functor.pattern.process_call(socket, event, functor)
except Exception:
try:
exc_type, exc_value, exc_traceback = sys.exc_info()
traceback.print_exception(exc_type, exc_value, exc_traceback,
file=sys.stderr)
human_traceback = traceback.format_exc()
name = exc_type.__name__
human_msg = str(exc_value)
if protocol_v2:
socket.emit('ERR', (name, human_msg, human_traceback))
else:
socket.emit('ERR', (repr(exc_value),))
finally:
del exc_traceback
finally:
socket.close()
socket.channel.close()
def _acceptor(self):
while True:
initial_event = self._multiplexer.recv()
self._task_pool.spawn(self._async_task, initial_event)
def run(self):
self._acceptor_task = gevent.spawn(self._acceptor)
try:
self._acceptor_task.get()
finally:
self._acceptor_task = None
self._task_pool.join(raise_error=True)
def stop(self):
if self._acceptor_task is not None:
self._acceptor_task.kill(block=False)
class Client(SocketBase):
patterns = [PatternReqStream(), PatternReqRep()]
def __init__(self, context=None, timeout=30, heartbeat=5,
passive_heartbeat=False):
super(Client, self).__init__(zmq.XREQ, context=context)
self._multiplexer = ChannelMultiplexer(self._events,
ignore_broadcast=True)
self._timeout = timeout
self._heartbeat_freq = heartbeat
self._passive_heartbeat = passive_heartbeat
def __del__(self):
self.close()
super(Client, self).__del__()
def close(self):
self._multiplexer.close()
super(Client, self).close()
def _raise_remote_error(self, event):
self._context.middleware_raise_error(event)
if event.header.get('v', 1) >= 2:
(name, msg, traceback) = event.args
raise RemoteError(name, msg, traceback)
else:
(msg,) = event.args
raise RemoteError('RemoteError', msg, None)
def _select_pattern(self, event):
for pattern in Client.patterns:
if pattern.accept_answer(event):
return pattern
msg = 'Unable to find a pattern for: {0}'.format(event)
raise RuntimeError(msg)
def _process_response(self, method, socket, timeout):
try:
try:
event = socket.recv(timeout)
except TimeoutExpired:
raise TimeoutExpired(timeout,
'calling remote method {0}'.format(method))
pattern = self._select_pattern(event)
return pattern.process_answer(socket, event, method, timeout,
self._raise_remote_error)
except:
socket.close()
socket.channel.close()
raise
def __call__(self, method, *args, **kargs):
timeout = kargs.get('timeout', self._timeout)
channel = self._multiplexer.channel()
socket = SocketOnChannel(channel, heartbeat=self._heartbeat_freq,
passive_heartbeat=self._passive_heartbeat,
inqueue_size=kargs.get('slots', 100))
socket.emit(method, args)
try:
if kargs.get('async', False) is False:
return self._process_response(method, socket, timeout)
async_result = gevent.event.AsyncResult()
gevent.spawn(self._process_response, method, socket,
timeout).link(async_result)
return async_result
except:
socket.close()
channel.close()
raise
def __getattr__(self, method):
return lambda *args, **kargs: self(method, *args, **kargs)
class Pusher(SocketBase):
def __init__(self, context=None, zmq_socket=zmq.PUSH):
super(Pusher, self).__init__(zmq_socket, context=context)
def __call__(self, method, *args):
self._events.emit(method, args)
def __getattr__(self, method):
return lambda *args: self(method, *args)
class Puller(SocketBase):
def __init__(self, methods=None, name=None, context=None,
zmq_socket=zmq.PULL):
super(Puller, self).__init__(zmq_socket, context=context)
if methods is None:
methods = self
if hasattr(methods, '__getitem__'):
self._methods = methods
else:
server_methods = set(getattr(self, k)
for k in dir(Pusher) if not k.startswith('_'))
self._methods = dict((k, getattr(methods, k))
for k in dir(methods)
if callable(getattr(methods, k))
and not k.startswith('_')
and getattr(methods, k) not in server_methods
)
self._receiver_task = None
def close(self):
self.stop()
super(Pusher, self).close()
def __call__(self, method, *args):
if method not in self._methods:
raise NameError(method)
return self._methods[method](*args)
def _receiver(self):
while True:
event = self._events.recv()
try:
if event.name not in self._methods:
raise NameError(event.name)
self._methods[event.name](*event.args)
except Exception:
traceback.print_exc(file=sys.stderr)
def run(self):
self._receiver_task = gevent.spawn(self._receiver)
try:
self._receiver_task.get()
finally:
self._receiver_task = None
def stop(self):
if self._receiver_task is not None:
self._receiver_task.kill(block=False)
class Publisher(Pusher):
def __init__(self, context=None):
super(Publisher, self).__init__(context=context, zmq_socket=zmq.PUB)
class Subscriber(Puller):
def __init__(self, context=None):
super(Subscriber, self).__init__(context=context, zmq_socket=zmq.SUB)
self._events.setsockopt(zmq.SUBSCRIBE, '')