126 lines
4.3 KiB
Python
126 lines
4.3 KiB
Python
#!/bin/env python
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# (C) Copyright 2015 Hewlett Packard Enterprise Development Company LP
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"""Monasca Agent wrapper for Nagios checks.
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"""
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import hashlib
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import json
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import os
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import pickle
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import socket
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import subprocess
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import time
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from monasca_agent.collector.checks.services_checks import ServicesCheck
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from monasca_agent.collector.checks.services_checks import Status
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class WrapNagios(ServicesCheck):
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"""Inherit ServicesCheck class to process Nagios checks.
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"""
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def __init__(self, name, init_config, agent_config, instances=None):
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ServicesCheck.__init__(self, name, init_config, agent_config, instances)
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@staticmethod
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def _do_skip_check(instance, last_run_data):
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"""Determine whether or not to skip a check depending on
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the checks's check_interval, if specified, and the last
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time the check was run
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"""
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if instance['name'] in last_run_data and 'check_interval' in instance:
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if time.time() < last_run_data[instance['name']] + instance['check_interval']:
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return True
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else:
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return False
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def _create_status_event(self, status, msg, instance):
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"""Does nothing: status events are not yet supported by Mon API.
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"""
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return
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def _check(self, instance):
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"""Run the command specified by check_command and capture the result.
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"""
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dimensions = self._set_dimensions({'observer_host': socket.getfqdn()}, instance)
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if 'host_name' in instance:
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dimensions.update({'target_host': instance['host_name']})
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else:
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dimensions.update({'target_host': socket.getfqdn()})
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extra_path = self.init_config.get('check_path')
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env = {}
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env['PATH'] = os.environ['PATH']
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if extra_path:
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env['PATH'] = "{0}:{1}".format(extra_path, env['PATH'])
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last_run_path = self.init_config.get('temp_file_path')
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# Use a default last_run_file if no temp_file is specified in the YAML
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if last_run_path is None:
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last_run_path = '/dev/shm/'
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if last_run_path.endswith('/') is False:
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last_run_path += '/'
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last_run_file = (
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last_run_path +
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'nagios_wrapper_' +
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hashlib.md5(
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instance['name']).hexdigest() +
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'.pck')
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# Load last-run data from shared memory file
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last_run_data = {}
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if os.path.isfile(last_run_file):
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file_r = open(last_run_file, "r")
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last_run_data = pickle.load(file_r)
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file_r.close()
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# Exit here if it is not yet time to re-run this check
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if self._do_skip_check(instance, last_run_data) is True:
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return
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metric_name = instance.get('metric_name', instance['name'])
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detail = None
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try:
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proc = subprocess.Popen(instance['check_command'].split(" "),
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env=env,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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output = proc.communicate()
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# The check detail is all the text before the pipe
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detail = output[0].split('|')[0]
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except OSError:
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# Return an UNKNOWN code (3) if I have landed here
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error_string = instance['check_command'].split(" ")[0] + " is missing or unreadable"
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self.gauge(metric_name,
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3,
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dimensions=dimensions,
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value_meta={'error': error_string})
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self.log.error(error_string)
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return Status.DOWN, "DOWN: {0}".format(error_string)
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finally:
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# Save last-run data
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last_run_data[instance['name']] = time.time()
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with open(last_run_file, "w") as file_w:
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pickle.dump(last_run_data, file_w)
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status_code = proc.poll()
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if detail:
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self.gauge(metric_name, status_code,
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dimensions=dimensions,
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value_meta={'detail': detail[0:2047]})
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else:
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self.gauge(metric_name, status_code, dimensions=dimensions)
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# Return DOWN on critical, UP otherwise
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if status_code == "2":
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return Status.DOWN, "DOWN: {0}".format(detail)
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return Status.UP, "UP: {0}".format(detail)
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