mirror of
https://github.com/GNS3/gns3-server
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59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2018 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 psutil
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import time
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class PingStats:
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"""
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Ping messages are regularly sent to the client to keep the connection open.
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We send with it some information about server load.
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"""
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_last_measurement = 0.0 # time of last measurement
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_last_cpu_percent = 0.0 # last cpu_percent
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_last_mem_percent = 0.0 # last virtual_memory().percent
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@classmethod
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def get(cls):
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"""
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Get ping statistics
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:returns: hash
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"""
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stats = {}
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cur_time = time.time()
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# minimum interval for getting CPU and memory statistics
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if cur_time < cls._last_measurement or \
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cur_time > cls._last_measurement + 1.9:
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cls._last_measurement = cur_time
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# Non blocking call to get cpu usage. First call will return 0
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try:
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cls._last_cpu_percent = psutil.cpu_percent(interval=None)
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cls._last_mem_percent = psutil.virtual_memory().percent
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except RuntimeError:
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# ignore the following error:
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# RuntimeError: host_statistics(HOST_CPU_LOAD_INFO) syscall failed: (ipc/send) invalid reply port
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pass
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except PermissionError:
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# [Errno 13] Permission denied: '/proc/stat'
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pass
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stats["cpu_usage_percent"] = cls._last_cpu_percent
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stats["memory_usage_percent"] = cls._last_mem_percent
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return stats
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