/usr/lib/python2.7/dist-packages/kombu/transport/zmq.py is in python-kombu 3.0.33-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 | """
kombu.transport.zmq
===================
ZeroMQ transport.
"""
from __future__ import absolute_import
import errno
import os
import socket
try:
import zmq
from zmq import ZMQError
except ImportError:
zmq = ZMQError = None # noqa
from kombu.five import Empty
from kombu.log import get_logger
from kombu.serialization import pickle
from kombu.utils import cached_property
from kombu.utils.eventio import poll, READ
from . import virtual
logger = get_logger('kombu.transport.zmq')
DEFAULT_PORT = 5555
DEFAULT_HWM = 128
DEFAULT_INCR = 1
dumps, loads = pickle.dumps, pickle.loads
class MultiChannelPoller(object):
eventflags = READ
def __init__(self):
# active channels
self._channels = set()
# file descriptor -> channel map
self._fd_to_chan = {}
# poll implementation (epoll/kqueue/select)
self.poller = poll()
def close(self):
for fd in self._fd_to_chan:
try:
self.poller.unregister(fd)
except KeyError:
pass
self._channels.clear()
self._fd_to_chan.clear()
self.poller = None
def add(self, channel):
self._channels.add(channel)
def discard(self, channel):
self._channels.discard(channel)
self._fd_to_chan.pop(channel.client.connection.fd, None)
def _register(self, channel):
conn = channel.client.connection
self._fd_to_chan[conn.fd] = channel
self.poller.register(conn.fd, self.eventflags)
def on_poll_start(self):
for channel in self._channels:
self._register(channel)
def on_readable(self, fileno):
chan = self._fd_to_chan[fileno]
return chan.drain_events(), chan
def get(self, timeout=None):
self.on_poll_start()
events = self.poller.poll(timeout)
for fileno, _ in events or []:
return self.on_readable(fileno)
raise Empty()
@property
def fds(self):
return self._fd_to_chan
class Client(object):
def __init__(self, uri='tcp://127.0.0.1', port=DEFAULT_PORT,
hwm=DEFAULT_HWM, swap_size=None, enable_sink=True,
context=None):
try:
scheme, parts = uri.split('://')
except ValueError:
scheme = 'tcp'
parts = uri
endpoints = parts.split(';')
self.port = port
if scheme != 'tcp':
raise NotImplementedError('Currently only TCP can be used')
self.context = context or zmq.Context.instance()
if enable_sink:
self.sink = self.context.socket(zmq.PULL)
self.sink.bind('tcp://*:{0.port}'.format(self))
else:
self.sink = None
self.vent = self.context.socket(zmq.PUSH)
if hasattr(zmq, 'SNDHWM'):
self.vent.setsockopt(zmq.SNDHWM, hwm)
else:
self.vent.setsockopt(zmq.HWM, hwm)
if swap_size:
self.vent.setsockopt(zmq.SWAP, swap_size)
for endpoint in endpoints:
if scheme == 'tcp' and ':' not in endpoint:
endpoint += ':' + str(DEFAULT_PORT)
endpoint = ''.join([scheme, '://', endpoint])
self.connect(endpoint)
def connect(self, endpoint):
self.vent.connect(endpoint)
def get(self, queue=None, timeout=None):
sink = self.sink
try:
if timeout is not None:
prev_timeout, sink.RCVTIMEO = sink.RCVTIMEO, timeout
try:
return sink.recv()
finally:
sink.RCVTIMEO = prev_timeout
else:
return sink.recv()
except ZMQError as exc:
if exc.errno == zmq.EAGAIN:
raise socket.error(errno.EAGAIN, exc.strerror)
else:
raise
def put(self, queue, message, **kwargs):
return self.vent.send(message)
def close(self):
if self.sink and not self.sink.closed:
self.sink.close()
if not self.vent.closed:
self.vent.close()
@property
def connection(self):
if self.sink:
return self.sink
return self.vent
class Channel(virtual.Channel):
Client = Client
hwm = DEFAULT_HWM
swap_size = None
enable_sink = True
port_incr = DEFAULT_INCR
from_transport_options = (
virtual.Channel.from_transport_options +
('hwm', 'swap_size', 'enable_sink', 'port_incr')
)
def __init__(self, *args, **kwargs):
super_ = super(Channel, self)
super_.__init__(*args, **kwargs)
# Evaluate socket
self.client.connection.closed
self.connection.cycle.add(self)
self.connection_errors = self.connection.connection_errors
def _get(self, queue, timeout=None):
try:
return loads(self.client.get(queue, timeout))
except socket.error as exc:
if exc.errno == errno.EAGAIN and timeout != 0:
raise Empty()
else:
raise
def _put(self, queue, message, **kwargs):
self.client.put(queue, dumps(message, -1), **kwargs)
def _purge(self, queue):
return 0
def _poll(self, cycle, timeout=None):
return cycle.get(timeout=timeout)
def close(self):
if not self.closed:
self.connection.cycle.discard(self)
try:
self.__dict__['client'].close()
except KeyError:
pass
super(Channel, self).close()
def _prepare_port(self, port):
return (port + self.channel_id - 1) * self.port_incr
def _create_client(self):
conninfo = self.connection.client
port = self._prepare_port(conninfo.port or DEFAULT_PORT)
return self.Client(uri=conninfo.hostname or 'tcp://127.0.0.1',
port=port,
hwm=self.hwm,
swap_size=self.swap_size,
enable_sink=self.enable_sink,
context=self.connection.context)
@cached_property
def client(self):
return self._create_client()
class Transport(virtual.Transport):
Channel = Channel
can_parse_url = True
default_port = DEFAULT_PORT
driver_type = 'zeromq'
driver_name = 'zmq'
connection_errors = virtual.Transport.connection_errors + (ZMQError, )
supports_ev = True
polling_interval = None
def __init__(self, *args, **kwargs):
if zmq is None:
raise ImportError('The zmq library is not installed')
super(Transport, self).__init__(*args, **kwargs)
self.cycle = MultiChannelPoller()
def driver_version(self):
return zmq.__version__
def register_with_event_loop(self, connection, loop):
cycle = self.cycle
cycle.poller = loop.poller
add_reader = loop.add_reader
on_readable = self.on_readable
cycle_poll_start = cycle.on_poll_start
def on_poll_start():
cycle_poll_start()
[add_reader(fd, on_readable, fd) for fd in cycle.fds]
loop.on_tick.add(on_poll_start)
def on_readable(self, fileno):
self._handle_event(self.cycle.on_readable(fileno))
def drain_events(self, connection, timeout=None):
more_to_read = False
for channel in connection.channels:
try:
evt = channel.cycle.get(timeout=timeout)
except socket.error as exc:
if exc.errno == errno.EAGAIN:
continue
raise
else:
connection._handle_event((evt, channel))
more_to_read = True
if not more_to_read:
raise socket.error(errno.EAGAIN, os.strerror(errno.EAGAIN))
def _handle_event(self, evt):
item, channel = evt
message, queue = item
if not queue or queue not in self._callbacks:
raise KeyError(
'Message for queue {0!r} without consumers: {1}'.format(
queue, message))
self._callbacks[queue](message)
def establish_connection(self):
self.context.closed
return super(Transport, self).establish_connection()
def close_connection(self, connection):
super(Transport, self).close_connection(connection)
try:
connection.__dict__['context'].term()
except KeyError:
pass
@cached_property
def context(self):
return zmq.Context(1)
|