import websocket
try:
    import thread
except ImportError:  # TODO use Threading instead of _thread in python3
    import _thread as thread
import time
import sys


def on_message(ws, message):
    print(message)


def on_error(ws, error):
    print(error)


def on_close(ws):
    print("### closed ###")


def on_open(ws):
    def run(*args):
        for i in range(3):
            # send the message, then wait
            # so thread doesn't exit and socket
            # isn't closed
            ws.send("Hello %d" % i)
            time.sleep(1)

        time.sleep(1)
        ws.close()
        print("Thread terminating...")

    thread.start_new_thread(run, ())

if __name__ == "__main__":
    websocket.enableTrace(True)
    if len(sys.argv) < 2:
        host = "ws://echo.websocket.org/"
    else:
        host = sys.argv[1]
    ws = websocket.WebSocketApp(host,
                                on_message=on_message,
                                on_error=on_error,
                                on_close=on_close)
    ws.on_open = on_open
    ws.run_forever()