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