###############################################################################
#
# The MIT License (MIT)
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# Copyright (c) typedef int GmbH
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import asyncio
import json

from autobahn.asyncio.websocket import WebSocketServerFactory, WebSocketServerProtocol


class SlowSquareServerProtocol(WebSocketServerProtocol):
    async def slowsquare(self, x):
        if x > 5:
            raise Exception("number too large")
        else:
            await asyncio.sleep(1)
            return x * x

    async def onMessage(self, payload, isBinary):
        if not isBinary:
            x = json.loads(payload.decode("utf8"))
            try:
                res = await 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://127.0.0.1:9000")
    factory.protocol = SlowSquareServerProtocol

    loop = asyncio.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()
