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141 lines
3.9 KiB
141 lines
3.9 KiB
# -*- coding: utf-8 -*-
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#
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# This file is part of Glances.
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#
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# Copyright (C) 2018 Nicolargo <nicolas@nicolargo.com>
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#
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# Glances is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser 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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# Glances 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 Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Attribute class."""
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from datetime import datetime
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class GlancesAttribute(object):
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def __init__(self, name, description='', history_max_size=None):
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"""Init the attribute
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name: Attribute name (string)
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description: Attribute human reading description (string)
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history_max_size: Maximum size of the history list (default is no limit)
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History is stored as a list for tuple: [(date, value), ...]
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"""
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self._name = name
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self._description = description
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self._value = None
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self._history_max_size = history_max_size
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self._history = []
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def __repr__(self):
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return self.value
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def __str__(self):
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return str(self.value)
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"""
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Properties for the attribute name
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"""
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@property
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def name(self):
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return self._name
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@name.setter
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def name(self, new_name):
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self._name = new_name
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"""
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Properties for the attribute description
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"""
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@property
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def description(self):
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return self._description
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@description.setter
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def description(self, new_description):
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self._description = new_description
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"""
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Properties for the attribute value
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"""
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@property
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def value(self):
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if self.history_len() > 0:
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return (self._value[1] - self.history_value()[1]) / (self._value[0] - self.history_value()[0])
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else:
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return None
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@value.setter
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def value(self, new_value):
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"""Set a value.
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Value is a tuple: (<timestamp>, <new_value>)
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"""
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self._value = (datetime.now(), new_value)
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self.history_add(self._value)
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"""
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Properties for the attribute history
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"""
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@property
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def history(self):
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return self._history
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@history.setter
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def history(self, new_history):
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self._history = new_history
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@history.deleter
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def history(self):
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del self._history
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def history_reset(self):
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self._history = []
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def history_add(self, value):
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"""Add a value in the history
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"""
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if self._history_max_size is None or self.history_len() < self._history_max_size:
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self._history.append(value)
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else:
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self._history = self._history[1:] + [value]
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def history_size(self):
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"""Return the history size (maximum nuber of value in the history)
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"""
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return len(self._history)
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def history_len(self):
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"""Return the current history lenght
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"""
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return len(self._history)
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def history_value(self, pos=1):
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"""Return the value in position pos in the history.
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Default is to return the latest value added to the history.
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"""
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return self._history[-pos]
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def history_raw(self, nb=0):
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"""Return the history in ISO JSON format"""
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return self._history[-nb:]
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def history_json(self, nb=0):
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"""Return the history in ISO JSON format"""
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return [(i[0].isoformat(), i[1]) for i in self._history[-nb:]]
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def history_mean(self, nb=5):
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"""Return the mean on the <nb> values in the history.
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"""
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_, v = zip(*self._history)
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return sum(v[-nb:]) / float(v[-1] - v[-nb])
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