Nicer shutdown

[klahnakoski]

mozilla-aws-cli ungracefully exits the process when a browser calls /shutdown, which makes it difficult to work with inside a larger application. A clean shutdown (without exit()) would make using mozilla-aws-cli as yet-another-library easier.

Here is some suggested code

@app.route("/shutdown", methods=["GET"])
def handle_shutdown():
    try:
        return Response(b"", 200)
    finally:
        try:
            Log.note("server shutdown")
            server.shutdown()
        except Exception as cause:
            Log.error("can not shutdown listener", cause=cause)


class ServerThread(threading.Thread):

    def __init__(self, app):
        threading.Thread.__init__(self)
        self.srv = make_server('127.0.0.1', port, app)
        self.ctx = app.app_context()
        self.ctx.push()

    def run(self):
        self.srv.serve_forever()

    def shutdown(self):
        self.srv.shutdown()


def listen(login_):
    global server, login

    login = login_
    server = ServerThread(app)
    server.start()

    os.environ["WERKZEUG_RUN_MAIN"] = "true"
    logging.getLogger("werkzeug").setLevel(logging.ERROR)

    return port