server.py

###############################################################################
#
# 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 autobahn.twisted.websocket import WebSocketServerProtocol, \
    WebSocketServerFactory
import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008
import time
import random

# GLOBAL VARIABLES
SPI_PORT = 0
SPI_DEVICE = 0
mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))


class MyServerProtocol(WebSocketServerProtocol):

    def onConnect(self, request):
        print("Client connecting: {0}".format(request.peer))

    def onOpen(self):
        print("WebSocket connection open.")

    def onMessage(self, payload, isBinary):
        buffer = []
        # Grab 0.025 [s] of data based on sample rate of 8 [kHz]
        for x in range(0, 200 - 1):
            buffer.append(mcp.read_adc(0) / 1024.0)
            #buffer.append(random.random())
            print(mcp.read_adc(0))
            time.sleep(0.000125)
        self.sendMessage(str(buffer), isBinary)

    def onClose(self, wasClean, code, reason):
        print("WebSocket connection closed: {0}".format(reason))


if __name__ == '__main__':

    import sys

    from twisted.python import log
    from twisted.internet import reactor

    log.startLogging(sys.stdout)

    factory = WebSocketServerFactory(u"ws://127.0.0.1:9000")
    factory.protocol = MyServerProtocol
    # factory.setProtocolOptions(maxConnections=2)

    # note to self: if using putChild, the child must be bytes...

    reactor.listenTCP(9000, factory)
    reactor.run()