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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import pickle
import time
import sys
if sys.version_info >= (3,):
import configparser
else:
import ConfigParser
class BasePlugin:
'''
Abstract class for plugins
'''
__name__ = ''
def __init__(self, agent_cache=[]):
if isinstance(agent_cache, list):
self.agent_cache = agent_cache
else:
raise TypeError('Type of agent_cache have to be list')
# if not self.__name__:
# self.__name__ = os.path.splitext(os.path.basename(__file__))[0]
def run(self, config=None):
'''
Virtual method for running the plugin
'''
pass
def execute(self):
'''
Execution wrapper for the plugin
argv[1]: ini_file
'''
config = None
if len(sys.argv) > 1:
if sys.version_info >= (3,):
config = configparser.RawConfigParser(defaults)
else:
config = ConfigParser.RawConfigParser(defaults)
config.read(sys.argv[1])
pickle.dump(self.run(config), sys.stdout.buffer)
def get_agent_cache(self):
'''
Return agent cached value for this specific plugin.
'''
try:
return self.agent_cache[0]
except Exception:
return {}
def set_agent_cache(self, cache):
'''
Set agent cache value previously passed to this plugin instance.
To enable caching existing agent_cache list have to be passed
to Plugin on initialization.
Minimally it should be list().
Agent will be able to see only changes in zero element of agent_cache, so
do not manually override self.agent_cache, othervice cache will not be saved!
If self.agent_cache is not a list appropriate exception will be raised.
'''
try:
self.agent_cache[0] = cache
except IndexError:
self.agent_cache.append(cache)
def absolute_to_per_second(self, key, val, prev_cache):
try:
if val >= prev_cache[key]:
value = \
(val - prev_cache[key]) / \
(time.time() - prev_cache['ts'])
else: # previous cached value should not be higher than current value (service was restarted?)
value = val / \
(time.time() - prev_cache['ts'])
except Exception: # No cache yet, can't calculate
value = 0
return value