84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
# (C) Copyright 2015 Hewlett Packard Enterprise Development Company LP
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"""Classes for detection of running resources to be monitored.
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Detection classes should be platform independent
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"""
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import ast
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import logging
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import sys
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log = logging.getLogger(__name__)
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class Plugin(object):
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"""Abstract class implemented by the monasca-agent plugin detection classes. """
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def __init__(self, template_dir, overwrite=True, args=None):
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self.available = False
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self.template_dir = template_dir
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self.dependencies = ()
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self.overwrite = overwrite
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if args is not None and isinstance(args, str):
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try:
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# Turn 'hostname=host type=ping' to dictionary {'hostname': 'host', 'type': 'ping'}
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self.args = dict([a.split('=') for a in args.split()])
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except Exception:
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log.exception('Error parsing detection arguments')
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sys.exit(1)
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elif isinstance(args, dict):
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self.args = args
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else:
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self.args = None
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self._detect()
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def _detect(self):
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"""Run detection, set self.available True if the service is detected.
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"""
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raise NotImplementedError
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def build_config(self):
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"""Build the config as a Plugins object and return.
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"""
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raise NotImplementedError
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def build_config_with_name(self):
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"""Builds the config and then adds a field 'built_by' to each instance in the config.
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built_by is set to the plugin name
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:return: An agent_config.Plugins object
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"""
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conf = self.build_config()
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if conf is None:
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return None
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for plugin_type in conf.itervalues():
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for inst in plugin_type['instances']:
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inst['built_by'] = self.__class__.__name__
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return conf
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def dependencies_installed(self):
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"""Return True if dependencies are installed.
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"""
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raise NotImplementedError
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def literal_eval(self, testval):
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"""Return a literal boolean value if applicable
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"""
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if 'false' in str(testval).lower() or 'true' in str(testval).lower():
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return ast.literal_eval(str(testval).capitalize())
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else:
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return testval
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@property
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def name(self):
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"""Return _name if set otherwise the class name.
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"""
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if '_name' in self.__dict__:
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return self._name
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else:
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return self.__class__.__name__
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