#!/usr/bin/env python # # Copyright (C) 2016 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. import asyncio import psutil import json import psutil class NotificationQueue(asyncio.Queue): """ Queue returned by the notification manager. """ def __init__(self): super().__init__() self._first = True @asyncio.coroutine def get(self, timeout): """ When timeout is expire we send a ping notification with server informations """ # At first get we return a ping so the client receive immediately data if self._first: self._first = False return ("ping", self._getPing(), {}) try: (action, msg, kwargs) = yield from asyncio.wait_for(super().get(), timeout) except asyncio.futures.TimeoutError: return ("ping", self._getPing(), {}) return (action, msg, kwargs) def _getPing(self): """ Return the content of the ping notification """ msg = {} # Non blocking call in order to get cpu usage. First call will return 0 msg["cpu_usage_percent"] = psutil.cpu_percent(interval=None) msg["memory_usage_percent"] = psutil.virtual_memory().percent return msg @asyncio.coroutine def get_json(self, timeout): """ Get a message as a JSON """ (action, msg, kwargs) = yield from self.get(timeout) if hasattr(msg, "__json__"): msg = {"action": action, "event": msg.__json__()} else: msg = {"action": action, "event": msg} msg.update(kwargs) return json.dumps(msg, sort_keys=True)