###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Tavendo 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:
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.
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from autobahn.asyncio.websocket import WebSocketServerProtocol, \
    WebSocketServerFactory

import json
import trollius


class SlowSquareServerProtocol(WebSocketServerProtocol):

    @trollius.coroutine
    def slowsquare(self, x):
        if x > 5:
            raise Exception("number too large")
        else:
            yield trollius.sleep(1)
            raise trollius.Return(x * x)

    @trollius.coroutine
    def onMessage(self, payload, isBinary):
        if not isBinary:
            x = json.loads(payload.decode('utf8'))
            try:
                res = yield self.slowsquare(x)
            except Exception as e:
                self.sendClose(1000, "Exception raised: {0}".format(e))
            else:
                self.sendMessage(json.dumps(res).encode('utf8'))


if __name__ == '__main__':

    factory = WebSocketServerFactory("ws://localhost:9000", debug=False)
    factory.protocol = SlowSquareServerProtocol

    loop = trollius.get_event_loop()
    coro = loop.create_server(factory, '127.0.0.1', 9000)
    server = loop.run_until_complete(coro)

    try:
        loop.run_forever()
    except KeyboardInterrupt:
        pass
    finally:
        server.close()
        loop.close()
