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#
# The MIT License (MIT)
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from ranstring import randomByteString
from twisted.internet import reactor

from autobahn.twisted.websocket import WebSocketClientFactory, \
    WebSocketClientProtocol, \
    connectWS

MESSAGE_SIZE = 1 * 2**20


class MessageBasedHashClientProtocol(WebSocketClientProtocol):

    """
    Message-based WebSockets client that generates stream of random octets
    sent to WebSockets server as a sequence of messages. The server will
    respond to us with the SHA-256 computed over each message. When
    we receive response, we repeat by sending a new message.
    """

    def sendOneMessage(self):
        data = randomByteString(MESSAGE_SIZE)
        self.sendMessage(data, isBinary=True)

    def onOpen(self):
        self.count = 0
        self.sendOneMessage()

    def onMessage(self, payload, isBinary):
        print("Digest for message {} computed by server: {}".format(self.count, payload.decode('utf8')))
        self.count += 1
        self.sendOneMessage()


if __name__ == '__main__':

    factory = WebSocketClientFactory("ws://127.0.0.1:9000")
    factory.protocol = MessageBasedHashClientProtocol
    connectWS(factory)
    reactor.run()