/usr/share/pyshared/eventlet/twistedutil/protocol.py is in python-eventlet 0.9.16-3.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 | """Basic twisted protocols converted to synchronous mode"""
import sys
from twisted.internet.protocol import Protocol as twistedProtocol
from twisted.internet.error import ConnectionDone
from twisted.internet.protocol import Factory, ClientFactory
from twisted.internet import main
from twisted.python import failure
from eventlet import greenthread
from eventlet import getcurrent
from eventlet.coros import Queue
from eventlet.event import Event as BaseEvent
class ValueQueue(Queue):
"""Queue that keeps the last item forever in the queue if it's an exception.
Useful if you send an exception over queue only once, and once sent it must be always
available.
"""
def send(self, value=None, exc=None):
if exc is not None or not self.has_error():
Queue.send(self, value, exc)
def wait(self):
"""The difference from Queue.wait: if there is an only item in the
Queue and it is an exception, raise it, but keep it in the Queue, so
that future calls to wait() will raise it again.
"""
if self.has_error() and len(self.items)==1:
# the last item, which is an exception, raise without emptying the Queue
getcurrent().throw(*self.items[0][1])
else:
return Queue.wait(self)
def has_error(self):
return self.items and self.items[-1][1] is not None
class Event(BaseEvent):
def send(self, value, exc=None):
if self.ready():
self.reset()
return BaseEvent.send(self, value, exc)
def send_exception(self, *throw_args):
if self.ready():
self.reset()
return BaseEvent.send_exception(self, *throw_args)
class Producer2Event(object):
# implements IPullProducer
def __init__(self, event):
self.event = event
def resumeProducing(self):
self.event.send(1)
def stopProducing(self):
del self.event
class GreenTransportBase(object):
transportBufferSize = None
def __init__(self, transportBufferSize=None):
if transportBufferSize is not None:
self.transportBufferSize = transportBufferSize
self._queue = ValueQueue()
self._write_event = Event()
self._disconnected_event = Event()
def build_protocol(self):
return self.protocol_class(self)
def _got_transport(self, transport):
self._queue.send(transport)
def _got_data(self, data):
self._queue.send(data)
def _connectionLost(self, reason):
self._disconnected_event.send(reason.value)
self._queue.send_exception(reason.value)
self._write_event.send_exception(reason.value)
def _wait(self):
if self.disconnecting or self._disconnected_event.ready():
if self._queue:
return self._queue.wait()
else:
raise self._disconnected_event.wait()
self.resumeProducing()
try:
return self._queue.wait()
finally:
self.pauseProducing()
def write(self, data, wait=True):
if self._disconnected_event.ready():
raise self._disconnected_event.wait()
if wait:
self._write_event.reset()
self.transport.write(data)
self._write_event.wait()
else:
self.transport.write(data)
def loseConnection(self, connDone=failure.Failure(main.CONNECTION_DONE), wait=True):
self.transport.unregisterProducer()
self.transport.loseConnection(connDone)
if wait:
self._disconnected_event.wait()
def __getattr__(self, item):
if item=='transport':
raise AttributeError(item)
if hasattr(self, 'transport'):
try:
return getattr(self.transport, item)
except AttributeError:
me = type(self).__name__
trans = type(self.transport).__name__
raise AttributeError("Neither %r nor %r has attribute %r" % (me, trans, item))
else:
raise AttributeError(item)
def resumeProducing(self):
self.paused -= 1
if self.paused==0:
self.transport.resumeProducing()
def pauseProducing(self):
self.paused += 1
if self.paused==1:
self.transport.pauseProducing()
def _init_transport_producer(self):
self.transport.pauseProducing()
self.paused = 1
def _init_transport(self):
transport = self._queue.wait()
self.transport = transport
if self.transportBufferSize is not None:
transport.bufferSize = self.transportBufferSize
self._init_transport_producer()
transport.registerProducer(Producer2Event(self._write_event), False)
class Protocol(twistedProtocol):
def __init__(self, recepient):
self._recepient = recepient
def connectionMade(self):
self._recepient._got_transport(self.transport)
def dataReceived(self, data):
self._recepient._got_data(data)
def connectionLost(self, reason):
self._recepient._connectionLost(reason)
class UnbufferedTransport(GreenTransportBase):
"""A very simple implementation of a green transport without an additional buffer"""
protocol_class = Protocol
def recv(self):
"""Receive a single chunk of undefined size.
Return '' if connection was closed cleanly, raise the exception if it was closed
in a non clean fashion. After that all successive calls return ''.
"""
if self._disconnected_event.ready():
return ''
try:
return self._wait()
except ConnectionDone:
return ''
def read(self):
"""Read the data from the socket until the connection is closed cleanly.
If connection was closed in a non-clean fashion, the appropriate exception
is raised. In that case already received data is lost.
Next time read() is called it returns ''.
"""
result = ''
while True:
recvd = self.recv()
if not recvd:
break
result += recvd
return result
# iterator protocol:
def __iter__(self):
return self
def next(self):
result = self.recv()
if not result:
raise StopIteration
return result
class GreenTransport(GreenTransportBase):
protocol_class = Protocol
_buffer = ''
_error = None
def read(self, size=-1):
"""Read size bytes or until EOF"""
if not self._disconnected_event.ready():
try:
while len(self._buffer) < size or size < 0:
self._buffer += self._wait()
except ConnectionDone:
pass
except:
if not self._disconnected_event.has_exception():
raise
if size>=0:
result, self._buffer = self._buffer[:size], self._buffer[size:]
else:
result, self._buffer = self._buffer, ''
if not result and self._disconnected_event.has_exception():
try:
self._disconnected_event.wait()
except ConnectionDone:
pass
return result
def recv(self, buflen=None):
"""Receive a single chunk of undefined size but no bigger than buflen"""
if not self._disconnected_event.ready():
self.resumeProducing()
try:
try:
recvd = self._wait()
#print 'received %r' % recvd
self._buffer += recvd
except ConnectionDone:
pass
except:
if not self._disconnected_event.has_exception():
raise
finally:
self.pauseProducing()
if buflen is None:
result, self._buffer = self._buffer, ''
else:
result, self._buffer = self._buffer[:buflen], self._buffer[buflen:]
if not result and self._disconnected_event.has_exception():
try:
self._disconnected_event.wait()
except ConnectionDone:
pass
return result
# iterator protocol:
def __iter__(self):
return self
def next(self):
res = self.recv()
if not res:
raise StopIteration
return res
class GreenInstanceFactory(ClientFactory):
def __init__(self, instance, event):
self.instance = instance
self.event = event
def buildProtocol(self, addr):
return self.instance
def clientConnectionFailed(self, connector, reason):
self.event.send_exception(reason.type, reason.value, reason.tb)
class GreenClientCreator(object):
"""Connect to a remote host and return a connected green transport instance.
"""
gtransport_class = GreenTransport
def __init__(self, reactor=None, gtransport_class=None, *args, **kwargs):
if reactor is None:
from twisted.internet import reactor
self.reactor = reactor
if gtransport_class is not None:
self.gtransport_class = gtransport_class
self.args = args
self.kwargs = kwargs
def _make_transport_and_factory(self):
gtransport = self.gtransport_class(*self.args, **self.kwargs)
protocol = gtransport.build_protocol()
factory = GreenInstanceFactory(protocol, gtransport._queue)
return gtransport, factory
def connectTCP(self, host, port, *args, **kwargs):
gtransport, factory = self._make_transport_and_factory()
self.reactor.connectTCP(host, port, factory, *args, **kwargs)
gtransport._init_transport()
return gtransport
def connectSSL(self, host, port, *args, **kwargs):
gtransport, factory = self._make_transport_and_factory()
self.reactor.connectSSL(host, port, factory, *args, **kwargs)
gtransport._init_transport()
return gtransport
def connectTLS(self, host, port, *args, **kwargs):
gtransport, factory = self._make_transport_and_factory()
self.reactor.connectTLS(host, port, factory, *args, **kwargs)
gtransport._init_transport()
return gtransport
def connectUNIX(self, address, *args, **kwargs):
gtransport, factory = self._make_transport_and_factory()
self.reactor.connectUNIX(address, factory, *args, **kwargs)
gtransport._init_transport()
return gtransport
def connectSRV(self, service, domain, *args, **kwargs):
SRVConnector = kwargs.pop('ConnectorClass', None)
if SRVConnector is None:
from twisted.names.srvconnect import SRVConnector
gtransport, factory = self._make_transport_and_factory()
c = SRVConnector(self.reactor, service, domain, factory, *args, **kwargs)
c.connect()
gtransport._init_transport()
return gtransport
class SimpleSpawnFactory(Factory):
"""Factory that spawns a new greenlet for each incoming connection.
For an incoming connection a new greenlet is created using the provided
callback as a function and a connected green transport instance as an
argument.
"""
gtransport_class = GreenTransport
def __init__(self, handler, gtransport_class=None, *args, **kwargs):
if callable(handler):
self.handler = handler
else:
self.handler = handler.send
if hasattr(handler, 'send_exception'):
self.exc_handler = handler.send_exception
if gtransport_class is not None:
self.gtransport_class = gtransport_class
self.args = args
self.kwargs = kwargs
def exc_handler(self, *args):
pass
def buildProtocol(self, addr):
gtransport = self.gtransport_class(*self.args, **self.kwargs)
protocol = gtransport.build_protocol()
protocol.factory = self
self._do_spawn(gtransport, protocol)
return protocol
def _do_spawn(self, gtransport, protocol):
greenthread.spawn(self._run_handler, gtransport, protocol)
def _run_handler(self, gtransport, protocol):
try:
gtransport._init_transport()
except Exception:
self.exc_handler(*sys.exc_info())
else:
self.handler(gtransport)
class SpawnFactory(SimpleSpawnFactory):
"""An extension to SimpleSpawnFactory that provides some control over
the greenlets it has spawned.
"""
def __init__(self, handler, gtransport_class=None, *args, **kwargs):
self.greenlets = set()
SimpleSpawnFactory.__init__(self, handler, gtransport_class, *args, **kwargs)
def _do_spawn(self, gtransport, protocol):
g = greenthread.spawn(self._run_handler, gtransport, protocol)
self.greenlets.add(g)
g.link(lambda *_: self.greenlets.remove(g))
def waitall(self):
results = []
for g in self.greenlets:
results.append(g.wait())
return results
|