mirror of
https://github.com/drewkerrigan/nagios-http-json.git
synced 2024-11-22 10:23:50 +01:00
453 lines
22 KiB
Python
Executable File
453 lines
22 KiB
Python
Executable File
#!/usr/bin/python2.7
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"""
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Check HTTP JSON Nagios Plugin
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Generic Nagios plugin which checks json values from a given endpoint against argument specified rules
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and determines the status and performance data for that service.
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Git repo found at: ssh://git@app01.stash.office.infra.cgn.travian.info:7999/sys/icinga_check_http_json.git
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Branch: tg
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Upstream: https://github.com/drewkerrigan/nagios-http-json
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"""
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import httplib, urllib, urllib2, base64
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import json
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import argparse
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import sys
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import ssl
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from pprint import pprint
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from urllib2 import HTTPError
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from urllib2 import URLError
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# TEST = False
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OK_CODE = 0
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WARNING_CODE = 1
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CRITICAL_CODE = 2
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UNKNOWN_CODE = 3
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class NagiosHelper:
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"""Help with Nagios specific status string formatting."""
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message_prefixes = {OK_CODE: 'OK', WARNING_CODE: 'WARNING', CRITICAL_CODE: 'CRITICAL', UNKNOWN_CODE: 'UNKNOWN'}
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performance_data = ''
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warning_message = ''
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critical_message = ''
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unknown_message = ''
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def getMessage(self):
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"""Build a status-prefixed message with optional performance data generated externally"""
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text = "%s: Status %s." % (self.message_prefixes[self.getCode()], self.message_prefixes[self.getCode()])
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text += self.warning_message
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text += self.critical_message
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text += self.unknown_message
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if self.performance_data:
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text += "|%s" % self.performance_data
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return text
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def getCode(self):
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code = OK_CODE
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if (self.warning_message != ''):
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code = WARNING_CODE
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if (self.critical_message != ''):
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code = CRITICAL_CODE
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if (self.unknown_message != ''):
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code = UNKNOWN_CODE
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return code
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def append_warning(self, warning_message):
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self.warning_message += warning_message
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def append_critical(self, critical_message):
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self.critical_message += critical_message
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def append_unknown(self, unknown_message):
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self.unknown_message += unknown_message
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def append_metrics(self, (performance_data, warning_message, critical_message)):
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self.performance_data += performance_data
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self.append_warning(warning_message)
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self.append_critical(critical_message)
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class JsonHelper:
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"""Perform simple comparison operations against values in a given JSON dict"""
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def __init__(self, json_data, separator):
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self.data = json_data
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self.separator = separator
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self.arrayOpener = '('
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self.arrayCloser = ')'
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def getSubElement(self, key, data):
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separatorIndex = key.find(self.separator)
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partialKey = key[:separatorIndex]
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remainingKey = key[separatorIndex + 1:]
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if partialKey in data:
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return self.get(remainingKey, data[partialKey])
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else:
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return (None, 'not_found')
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def getSubArrayElement(self, key, data):
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subElemKey = key[:key.find(self.arrayOpener)]
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index = int(key[key.find(self.arrayOpener) + 1:key.find(self.arrayCloser)])
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remainingKey = key[key.find(self.arrayCloser + self.separator) + 2:]
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if key.find(self.arrayCloser + self.separator) == -1:
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remainingKey = key[key.find(self.arrayCloser) + 1:]
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if subElemKey in data:
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if index < len(data[subElemKey]):
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return self.get(remainingKey, data[subElemKey][index])
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else:
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return (None, 'not_found')
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else:
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if not subElemKey:
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return self.get(remainingKey, data[index])
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else:
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return (None, 'not_found')
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def equals(self, key, value): return self.exists(key) and str(self.get(key)) in value.split(':')
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def lte(self, key, value): return self.exists(key) and float(self.get(key)) <= float(value)
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def lt(self, key, value): return self.exists(key) and float(self.get(key)) < float(value)
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def gte(self, key, value): return self.exists(key) and float(self.get(key)) >= float(value)
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def gt(self, key, value): return self.exists(key) and float(self.get(key)) > float(value)
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def exists(self, key): return (self.get(key) != (None, 'not_found'))
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def get(self, key, temp_data=''):
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"""Can navigate nested json keys with a dot format (Element.Key.NestedKey). Returns (None, 'not_found') if not found"""
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if temp_data:
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data = temp_data
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else:
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data = self.data
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if len(key) <= 0:
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return data
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if key.find(self.separator) != -1 and key.find(self.arrayOpener) != -1 :
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if key.find(self.separator) < key.find(self.arrayOpener) :
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return self.getSubElement(key, data)
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else:
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return self.getSubArrayElement(key, data)
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else:
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if key.find(self.separator) != -1 :
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return self.getSubElement(key, data)
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else:
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if key.find(self.arrayOpener) != -1 :
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return self.getSubArrayElement(key, data)
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else:
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if key in data:
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return data[key]
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else:
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return (None, 'not_found')
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def _getKeyAlias(original_key):
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key = original_key
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alias = original_key
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if '>' in original_key:
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keys = original_key.split('>')
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if len(keys) == 2:
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key, alias = keys
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return key, alias
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class JsonRuleProcessor:
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"""Perform checks and gather values from a JSON dict given rules and metrics definitions"""
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def __init__(self, json_data, rules_args):
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self.data = json_data
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self.rules = rules_args
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separator = '.'
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if self.rules.separator: separator = self.rules.separator
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self.helper = JsonHelper(self.data, separator)
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debugPrint(rules_args.debug, "rules:%s" % rules_args)
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debugPrint(rules_args.debug, "separator:%s" % separator)
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def checkExists(self, exists_list):
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failure = ''
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for k in exists_list:
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key, alias = _getKeyAlias(k)
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if (self.helper.exists(key) == False):
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failure += " Key %s did not exist." % alias
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return failure
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def checkEquality(self, equality_list):
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failure = ''
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for kv in equality_list:
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k, v = kv.split(',')
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key, alias = _getKeyAlias(k)
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if (self.helper.equals(key, v) == False):
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failure += " Value for key %s did not match %s." % (alias, v)
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return failure
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def checkThreshold(self, key, alias, r):
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failure = ''
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invert = False
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start = 0
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end = 'infinity'
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if r.startswith('@'):
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invert = True
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r = r[1:]
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vals = r.split(':')
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if len(vals) == 1:
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end = vals[0]
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if len(vals) == 2:
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start = vals[0]
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if vals[1] != '':
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end = vals[1]
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if(start == '~'):
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if (invert and self.helper.lte(key, end)):
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failure += " Value (%s) for key %s was less than or equal to %s." % (self.helper.get(key), alias, end)
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elif (not invert and self.helper.gt(key, end)):
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failure += " Value (%s) for key %s was greater than %s." % (self.helper.get(key), alias, end)
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elif(end == 'infinity'):
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if (invert and self.helper.gte(key, start)):
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failure += " Value (%s) for key %s was greater than or equal to %s." % (self.helper.get(key), alias, start)
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elif (not invert and self.helper.lt(key, start)):
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failure += " Value (%s) for key %s was less than %s." % (self.helper.get(key), alias, start)
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else:
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if (invert and self.helper.gte(key, start) and self.helper.lte(key, end)):
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failure += " Value (%s) for key %s was inside the range %s:%s." % (self.helper.get(key), alias, start, end)
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elif (not invert and (self.helper.lt(key, start) or self.helper.gt(key, end))):
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failure += " Value (%s) for key %s was outside the range %s:%s." % (self.helper.get(key), alias, start, end)
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return failure
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def checkThresholds(self, threshold_list):
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failure = ''
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for threshold in threshold_list:
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k, r = threshold.split(',')
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key, alias = _getKeyAlias(k)
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failure += self.checkThreshold(key, alias, r)
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return failure
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def checkWarning(self):
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failure = ''
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if self.rules.key_threshold_warning != None:
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failure += self.checkThresholds(self.rules.key_threshold_warning)
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if self.rules.key_value_list != None:
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failure += self.checkEquality(self.rules.key_value_list)
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if self.rules.key_list != None:
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failure += self.checkExists(self.rules.key_list)
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return failure
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def checkCritical(self):
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failure = ''
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if self.rules.key_threshold_critical != None:
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failure += self.checkThresholds(self.rules.key_threshold_critical)
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if self.rules.key_value_list_critical != None:
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failure += self.checkEquality(self.rules.key_value_list_critical)
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if self.rules.key_list_critical != None:
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failure += self.checkExists(self.rules.key_list_critical)
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return failure
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def checkMetrics(self):
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"""Return a Nagios specific performance metrics string given keys and parameter definitions"""
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metrics = ''
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warning = ''
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critical = ''
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if self.rules.metric_list != None:
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for metric in self.rules.metric_list:
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key = metric
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minimum = maximum = warn_range = crit_range = None
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uom = ''
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if ',' in metric:
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vals = metric.split(',')
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if len(vals) == 2:
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key,uom = vals
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if len(vals) == 4:
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key,uom,warn_range,crit_range = vals
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if len(vals) == 6:
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key,uom,warn_range,crit_range,minimum,maximum = vals
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key, alias = _getKeyAlias(key)
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if self.helper.exists(key):
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metrics += "'%s'=%s" % (alias, self.helper.get(key))
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if uom: metrics += uom
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if warn_range != None:
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warning += self.checkThreshold(key, alias, warn_range)
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metrics += ";%s" % warn_range
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if crit_range != None:
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critical += self.checkThreshold(key, alias, crit_range)
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metrics += ";%s" % crit_range
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if minimum != None:
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critical += self.checkThreshold(key, alias, minimum + ':')
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metrics += ";%s" % minimum
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if maximum != None:
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critical += self.checkThreshold(key, alias, '~:' + maximum)
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metrics += ";%s" % maximum
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metrics += ' '
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return ("%s" % metrics, warning, critical)
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def parseArgs():
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parser = argparse.ArgumentParser(description=
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'Nagios plugin which checks json values from a given endpoint against argument specified rules\
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and determines the status and performance data for that service')
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# parser.add_argument('-v', '--verbose', action='store_true', help='Verbose Output')
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parser.add_argument('-d', '--debug', action='store_true', help='Debug mode.')
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parser.add_argument('-s', '--ssl', action='store_true', help='HTTPS mode.')
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parser.add_argument('-k', '--insecure', action='store_true', help='do not check server SSL certificate')
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parser.add_argument('-H', '--host', dest='host', required=True, help='Host.')
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parser.add_argument('-P', '--port', dest='port', help='TCP port')
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parser.add_argument('-p', '--path', dest='path', help='Path.')
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parser.add_argument('-t', '--timeout', type=int, help='Connection timeout (seconds)')
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parser.add_argument('-B', '--basic-auth', dest='auth', help='Basic auth string "username:password"')
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parser.add_argument('-D', '--data', dest='data', help='The http payload to send as a POST')
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parser.add_argument('-A', '--headers', dest='headers', help='The http headers in JSON format.')
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parser.add_argument('-f', '--field_separator', dest='separator',
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help='Json Field separator, defaults to "." ; Select element in an array with "(" ")"')
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parser.add_argument('-w', '--warning', dest='key_threshold_warning', nargs='*',
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help='Warning threshold for these values (key1[>alias],WarnRange key2[>alias],WarnRange). WarnRange is in the format [@]start:end, more information at nagios-plugins.org/doc/guidelines.html.')
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parser.add_argument('-c', '--critical', dest='key_threshold_critical', nargs='*',
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help='Critical threshold for these values (key1[>alias],CriticalRange key2[>alias],CriticalRange. CriticalRange is in the format [@]start:end, more information at nagios-plugins.org/doc/guidelines.html.')
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parser.add_argument('-e', '--key_exists', dest='key_list', nargs='*',
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help='Checks existence of these keys to determine status. Return warning if key is not present.')
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parser.add_argument('-E', '--key_exists_critical', dest='key_list_critical', nargs='*',
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help='Same as -e but return critical if key is not present.')
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parser.add_argument('-q', '--key_equals', dest='key_value_list', nargs='*',
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help='Checks equality of these keys and values (key[>alias],value key2,value2) to determine status.\
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Multiple key values can be delimited with colon (key,value1:value2). Return warning if equality check fails')
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parser.add_argument('-Q', '--key_equals_critical', dest='key_value_list_critical', nargs='*',
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help='Same as -q but return critical if equality check fails.')
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parser.add_argument('-m', '--key_metric', dest='metric_list', nargs='*',
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help='Gathers the values of these keys (key[>alias],UnitOfMeasure,WarnRange,CriticalRange,Min,Max) for Nagios performance data.\
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More information about Range format and units of measure for nagios can be found at nagios-plugins.org/doc/guidelines.html\
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Additional formats for this parameter are: (key[>alias]), (key[>alias],UnitOfMeasure), (key[>alias],UnitOfMeasure,WarnRange,CriticalRange).')
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return parser.parse_args()
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def debugPrint(debug_flag, message, pretty_flag=False):
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if debug_flag:
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if pretty_flag:
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pprint(message)
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else:
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print message
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if __name__ == "__main__" and len(sys.argv) >= 2 and sys.argv[1] == 'UnitTest':
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import unittest
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class RulesHelper:
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separator = '.'
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debug = False
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key_threshold_warning,key_value_list,key_list,key_threshold_critical,key_value_list_critical,key_list_critical,metric_list = None, None, None, None, None, None, None
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def dash_m(self, data):
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self.metric_list = data; return self
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def dash_e(self, data):
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self.key_list = data; return self
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def dash_E(self, data):
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self.key_list_critical = data; return self
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def dash_q(self, data):
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self.key_value_list = data; return self
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def dash_Q(self, data):
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self.key_value_list_critical = data; return self
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def dash_w(self, data):
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self.key_threshold_warning = data; return self
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def dash_c(self, data):
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self.key_threshold_critical = data; return self
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class UnitTest(unittest.TestCase):
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rules = RulesHelper()
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def check_data(self, args, jsondata, code):
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data = json.loads(jsondata)
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nagios = NagiosHelper()
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processor = JsonRuleProcessor(data, args)
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nagios.append_warning(processor.checkWarning())
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nagios.append_critical(processor.checkCritical())
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nagios.append_metrics(processor.checkMetrics())
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self.assertEqual(code, nagios.getCode())
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def test_metrics(self):
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self.check_data(RulesHelper().dash_m(['metric,,1:4,1:5']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_m(['metric,,1:5,1:4']), '{"metric": 5}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_m(['metric,,1:5,1:5,6,10']), '{"metric": 5}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_m(['metric,,1:5,1:5,1,4']), '{"metric": 5}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_m(['metric,s,@1:4,@6:10,1,10']), '{"metric": 5}', OK_CODE)
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def test_exists(self):
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self.check_data(RulesHelper().dash_e(['nothere']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_E(['nothere']), '{"metric": 5}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_e(['metric']), '{"metric": 5}', OK_CODE)
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def test_equality(self):
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self.check_data(RulesHelper().dash_q(['metric,6']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_Q(['metric,6']), '{"metric": 5}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_q(['metric,5']), '{"metric": 5}', OK_CODE)
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def test_warning_thresholds(self):
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self.check_data(RulesHelper().dash_w(['metric,5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,5:']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,~:5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,1:5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@5:']), '{"metric": 4}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@~:5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@1:5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_w(['metric,5']), '{"metric": 6}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,5:']), '{"metric": 4}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,~:5']), '{"metric": 6}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,1:5']), '{"metric": 6}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@5']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@5:']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@~:5']), '{"metric": 5}', WARNING_CODE)
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self.check_data(RulesHelper().dash_w(['metric,@1:5']), '{"metric": 5}', WARNING_CODE)
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def test_critical_thresholds(self):
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self.check_data(RulesHelper().dash_c(['metric,5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,5:']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,~:5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,1:5']), '{"metric": 5}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,@5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,@5:']), '{"metric": 4}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,@~:5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,@1:5']), '{"metric": 6}', OK_CODE)
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self.check_data(RulesHelper().dash_c(['metric,5']), '{"metric": 6}', CRITICAL_CODE)
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self.check_data(RulesHelper().dash_c(['metric,5:']), '{"metric": 4}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,~:5']), '{"metric": 6}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,1:5']), '{"metric": 6}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,@5']), '{"metric": 5}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,@5:']), '{"metric": 5}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,@~:5']), '{"metric": 5}', CRITICAL_CODE)
|
|
self.check_data(RulesHelper().dash_c(['metric,@1:5']), '{"metric": 5}', CRITICAL_CODE)
|
|
def test_separator(self):
|
|
rules = RulesHelper()
|
|
rules.separator = '_'
|
|
self.check_data(
|
|
rules.dash_q(['(0)_gauges_jvm.buffers.direct.capacity(1)_value,1234']),
|
|
'[{ "gauges": { "jvm.buffers.direct.capacity": [{"value": 215415},{"value": 1234}]}}]',
|
|
OK_CODE)
|
|
unittest.main()
|
|
exit(0)
|
|
|
|
"""Program entry point"""
|
|
if __name__ == "__main__":
|
|
args = parseArgs()
|
|
nagios = NagiosHelper()
|
|
if args.ssl:
|
|
url = "https://%s" % args.host
|
|
else:
|
|
url = "http://%s" % args.host
|
|
if args.port: url += ":%s" % args.port
|
|
if args.path: url += "/%s" % args.path
|
|
debugPrint(args.debug, "url:%s" % url)
|
|
if args.insecure:
|
|
context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
|
|
else:
|
|
context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
|
|
context.verify_mode = ssl.CERT_OPTIONAL
|
|
# Attempt to reach the endpoint
|
|
try:
|
|
req = urllib2.Request(url)
|
|
if args.auth:
|
|
base64str = base64.encodestring(args.auth).replace('\n', '')
|
|
req.add_header('Authorization', 'Basic %s' % base64str)
|
|
if args.headers:
|
|
headers=json.loads(args.headers)
|
|
debugPrint(args.debug, "Headers:\n %s" % headers)
|
|
for header in headers:
|
|
req.add_header(header, headers[header])
|
|
if args.timeout and args.data:
|
|
response = urllib2.urlopen(req, timeout=args.timeout, data=args.data, context=context)
|
|
elif args.timeout:
|
|
response = urllib2.urlopen(req, timeout=args.timeout, context=context)
|
|
elif args.data:
|
|
response = urllib2.urlopen(req, data=args.data, context=context)
|
|
else:
|
|
response = urllib2.urlopen(req, context=context)
|
|
except HTTPError as e:
|
|
nagios.append_unknown("HTTPError[%s], url:%s" % (str(e.code), url))
|
|
except URLError as e:
|
|
nagios.append_critical("URLError[%s], url:%s" % (str(e.reason), url))
|
|
else:
|
|
jsondata = response.read()
|
|
data = json.loads(jsondata)
|
|
debugPrint(args.debug, 'json:')
|
|
debugPrint(args.debug, data, True)
|
|
# Apply rules to returned JSON data
|
|
processor = JsonRuleProcessor(data, args)
|
|
nagios.append_warning(processor.checkWarning())
|
|
nagios.append_critical(processor.checkCritical())
|
|
nagios.append_metrics(processor.checkMetrics())
|
|
# Print Nagios specific string and exit appropriately
|
|
print nagios.getMessage()
|
|
exit(nagios.getCode())
|