1###############################################################################
2#
3# The MIT License (MIT)
4#
5# Copyright (c) Crossbar.io Technologies GmbH
6#
7# Permission is hereby granted, free of charge, to any person obtaining a copy
8# of this software and associated documentation files (the "Software"), to deal
9# in the Software without restriction, including without limitation the rights
10# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11# copies of the Software, and to permit persons to whom the Software is
12# furnished to do so, subject to the following conditions:
13#
14# The above copyright notice and this permission notice shall be included in
15# all copies or substantial portions of the Software.
16#
17# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23# THE SOFTWARE.
24#
25###############################################################################
26
27from ranstring import randomByteString
28from twisted.internet import reactor
29
30from autobahn.twisted.websocket import WebSocketClientFactory, \
31    WebSocketClientProtocol, \
32    connectWS
33
34MESSAGE_SIZE = 1 * 2**20
35
36
37class MessageBasedHashClientProtocol(WebSocketClientProtocol):
38
39    """
40    Message-based WebSockets client that generates stream of random octets
41    sent to WebSockets server as a sequence of messages. The server will
42    respond to us with the SHA-256 computed over each message. When
43    we receive response, we repeat by sending a new message.
44    """
45
46    def sendOneMessage(self):
47        data = randomByteString(MESSAGE_SIZE)
48        self.sendMessage(data, isBinary=True)
49
50    def onOpen(self):
51        self.count = 0
52        self.sendOneMessage()
53
54    def onMessage(self, payload, isBinary):
55        print("Digest for message {} computed by server: {}".format(self.count, payload.decode('utf8')))
56        self.count += 1
57        self.sendOneMessage()
58
59
60if __name__ == '__main__':
61
62    factory = WebSocketClientFactory(u"ws://127.0.0.1:9000")
63    factory.protocol = MessageBasedHashClientProtocol
64    connectWS(factory)
65    reactor.run()
66