/usr/lib/python2.7/dist-packages/ws4py/manager.py is in python-ws4py 0.3.4-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 | # -*- coding: utf-8 -*-
__doc__ = """
The manager module provides a selected classes to
handle websocket's execution.
Initially the rationale was to:
- Externalize the way the CherryPy server had been setup
as its websocket management was too tightly coupled with
the plugin implementation.
- Offer a management that could be used by other
server or client implementations.
- Move away from the threaded model to the event-based
model by relying on `select` or `epoll` (when available).
A simple usage for handling websocket clients:
.. code-block:: python
from ws4py.client import WebSocketBaseClient
from ws4py.manager import WebSocketManager
m = WebSocketManager()
class EchoClient(WebSocketBaseClient):
def handshake_ok(self):
m.add(self) # register the client once the handshake is done
def received_message(self, msg):
print str(msg)
m.start()
client = EchoClient('ws://localhost:9000/ws')
client.connect()
m.join() # blocks forever
Managers are not compulsory but hopefully will help your
workflow. For clients, you can still rely on threaded, gevent or
tornado based implementations of course.
"""
import logging
import select
import threading
import time
from ws4py import format_addresses
from ws4py.compat import py3k
logger = logging.getLogger('ws4py')
class SelectPoller(object):
def __init__(self, timeout=0.1):
"""
A socket poller that uses the `select`
implementation to determines which
file descriptors have data available to read.
It is available on all platforms.
"""
self._fds = []
self.timeout = timeout
def release(self):
"""
Cleanup resources.
"""
self._fds = []
def register(self, fd):
"""
Register a new file descriptor to be
part of the select polling next time around.
"""
if fd not in self._fds:
self._fds.append(fd)
def unregister(self, fd):
"""
Unregister the given file descriptor.
"""
if fd in self._fds:
self._fds.remove(fd)
def poll(self):
"""
Polls once and returns a list of
ready-to-be-read file descriptors.
"""
if not self._fds:
time.sleep(self.timeout)
return []
r, w, x = select.select(self._fds, [], [], self.timeout)
return r
class EPollPoller(object):
def __init__(self, timeout=0.1):
"""
An epoll poller that uses the ``epoll``
implementation to determines which
file descriptors have data available to read.
Available on Unix flavors mostly.
"""
self.poller = select.epoll()
self.timeout = timeout
def release(self):
"""
Cleanup resources.
"""
self.poller.close()
def register(self, fd):
"""
Register a new file descriptor to be
part of the select polling next time around.
"""
try:
self.poller.register(fd, select.EPOLLIN | select.EPOLLPRI)
except IOError:
pass
def unregister(self, fd):
"""
Unregister the given file descriptor.
"""
self.poller.unregister(fd)
def poll(self):
"""
Polls once and yields each ready-to-be-read
file-descriptor
"""
events = self.poller.poll(timeout=self.timeout)
for fd, event in events:
if event | select.EPOLLIN | select.EPOLLPRI:
yield fd
class KQueuePoller(object):
def __init__(self, timeout=0.1):
"""
An epoll poller that uses the ``epoll``
implementation to determines which
file descriptors have data available to read.
Available on Unix flavors mostly.
"""
self.poller = select.epoll()
self.timeout = timeout
def release(self):
"""
Cleanup resources.
"""
self.poller.close()
def register(self, fd):
"""
Register a new file descriptor to be
part of the select polling next time around.
"""
try:
self.poller.register(fd, select.EPOLLIN | select.EPOLLPRI)
except IOError:
pass
def unregister(self, fd):
"""
Unregister the given file descriptor.
"""
self.poller.unregister(fd)
def poll(self):
"""
Polls once and yields each ready-to-be-read
file-descriptor
"""
events = self.poller.poll(timeout=self.timeout)
for fd, event in events:
if event | select.EPOLLIN | select.EPOLLPRI:
yield fd
class WebSocketManager(threading.Thread):
def __init__(self, poller=None):
"""
An event-based websocket manager. By event-based, we mean
that the websockets will be called when their
sockets have data to be read from.
The manager itself runs in its own thread as not to
be the blocking mainloop of your application.
The poller's implementation is automatically chosen
with ``epoll`` if available else ``select`` unless you
provide your own ``poller``.
"""
threading.Thread.__init__(self)
self.lock = threading.Lock()
self.websockets = {}
self.running = False
if poller:
self.poller = poller
else:
if hasattr(select, "epoll"):
self.poller = EPollPoller()
logger.info("Using epoll")
else:
self.poller = SelectPoller()
logger.info("Using select as epoll is not available")
def __len__(self):
return len(self.websockets)
def __iter__(self):
if py3k:
return iter(self.websockets.values())
else:
return self.websockets.itervalues()
def __contains__(self, ws):
fd = ws.sock.fileno()
# just in case the file descriptor was reused
# we actually check the instance (well, this might
# also have been reused...)
return self.websockets.get(fd) is ws
def add(self, websocket):
"""
Manage a new websocket.
First calls its :meth:`opened() <ws4py.websocket.WebSocket.opened>`
method and register its socket against the poller
for reading events.
"""
if websocket in self:
return
logger.info("Managing websocket %s" % format_addresses(websocket))
websocket.opened()
with self.lock:
fd = websocket.sock.fileno()
self.websockets[fd] = websocket
self.poller.register(fd)
def remove(self, websocket):
"""
Remove the given ``websocket`` from the manager.
This does not call its :meth:`closed() <ws4py.websocket.WebSocket.closed>`
method as it's out-of-band by your application
or from within the manager's run loop.
"""
if websocket not in self:
return
logger.info("Removing websocket %s" % format_addresses(websocket))
with self.lock:
fd = websocket.sock.fileno()
self.websockets.pop(fd, None)
self.poller.unregister(fd)
def stop(self):
"""
Mark the manager as terminated and
releases its resources.
"""
self.running = False
with self.lock:
self.websockets.clear()
self.poller.release()
def run(self):
"""
Manager's mainloop executed from within a thread.
Constantly poll for read events and, when available,
call related websockets' `once` method to
read and process the incoming data.
If the :meth:`once() <ws4py.websocket.WebSocket.once>`
method returns a `False` value, its :meth:`terminate() <ws4py.websocket.WebSocket.terminate>`
method is also applied to properly close
the websocket and its socket is unregistered from the poller.
Note that websocket shouldn't take long to process
their data or they will block the remaining
websockets with data to be handled. As for what long means,
it's up to your requirements.
"""
self.running = True
while self.running:
with self.lock:
polled = self.poller.poll()
if not self.running:
break
for fd in polled:
if not self.running:
break
ws = self.websockets.get(fd)
if ws and not ws.terminated:
if not ws.once():
with self.lock:
fd = ws.sock.fileno()
self.websockets.pop(fd, None)
self.poller.unregister(fd)
if not ws.terminated:
logger.info("Terminating websocket %s" % format_addresses(ws))
ws.terminate()
def close_all(self, code=1001, message='Server is shutting down'):
"""
Execute the :meth:`close() <ws4py.websocket.WebSocket.close>`
method of each registered websockets to initiate the closing handshake.
It doesn't wait for the handshake to complete properly.
"""
with self.lock:
logger.info("Closing all websockets with [%d] '%s'" % (code, message))
for ws in iter(self):
ws.close(code=code, reason=message)
def broadcast(self, message, binary=False):
"""
Broadcasts the given message to all registered
websockets, at the time of the call.
Broadcast may fail on a given registered peer
but this is silent as it's not the method's
purpose to handle websocket's failures.
"""
with self.lock:
websockets = self.websockets.copy()
if py3k:
ws_iter = iter(websockets.values())
else:
ws_iter = websockets.itervalues()
for ws in ws_iter:
if not ws.terminated:
try:
ws.send(message, binary)
except:
pass
|