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###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Crossbar.io Technologies GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
from ranstring import randomByteString
from zope.interface import implementer
from twisted.internet import reactor, interfaces
from autobahn.twisted.websocket import WebSocketClientFactory, \
WebSocketClientProtocol, \
connectWS
# 2^63 - This is the maximum imposed by the WS protocol
FRAME_SIZE = 0x7FFFFFFFFFFFFFFF
@implementer(interfaces.IPushProducer)
class RandomByteStreamProducer:
"""
A Twisted Push Producer generating a stream of random octets sending out data
in a WebSockets message frame.
"""
def __init__(self, proto):
self.proto = proto
self.started = False
self.paused = False
def pauseProducing(self):
self.paused = True
def resumeProducing(self):
self.paused = False
if not self.started:
self.proto.beginMessage(isBinary=True)
self.proto.beginMessageFrame(FRAME_SIZE)
self.started = True
while not self.paused:
data = randomByteString(1024)
if self.proto.sendMessageFrameData(data) <= 0:
self.proto.beginMessageFrame(FRAME_SIZE)
print("new frame started!")
def stopProducing(self):
pass
class StreamingProducerHashClientProtocol(WebSocketClientProtocol):
"""
Streaming WebSockets client that generates stream of random octets
sent to streaming WebSockets server, which computes a running SHA-256,
which it will send every BATCH_SIZE octets back to us. This example
uses a Twisted producer to produce the byte stream as fast as the
receiver can consume, but not faster. Therefor, we don't need the
application-level flow control as with the other examples.
"""
def onOpen(self):
self.count = 0
producer = RandomByteStreamProducer(self)
self.registerProducer(producer, True)
producer.resumeProducing()
def onMessage(self, payload, isBinary):
print("Digest for batch {} computed by server: {}".format(self.count, payload.decode('utf8')))
self.count += 1
if __name__ == '__main__':
factory = WebSocketClientFactory("ws://127.0.0.1:9000")
factory.protocol = StreamingProducerHashClientProtocol
connectWS(factory)
reactor.run()
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