class Sensu::Handler

Attributes

argv[RW]

Public Class Methods

disable_autorun() click to toggle source
# File lib/sensu-handler.rb, line 46
def self.disable_autorun
  @@autorun = false
end
method_added(name) click to toggle source
# File lib/sensu-handler.rb, line 39
def method_added(name)
  if name == :handle
    @@autorun = self
  end
end
new(argv = ARGV) click to toggle source
Calls superclass method
# File lib/sensu-handler.rb, line 14
def initialize(argv = ARGV)
  super()
  self.argv = parse_options(argv)
end

Public Instance Methods

api_request(method, path) { |req| ... } click to toggle source
# File lib/sensu-handler.rb, line 78
def api_request(method, path, &blk)
  http = Net::HTTP.new(settings['api']['host'], settings['api']['port'])
  req = net_http_req_class(method).new(path)
  if settings['api']['user'] && settings['api']['password']
    req.basic_auth(settings['api']['user'], settings['api']['password'])
  end
  yield(req) if block_given?
  http.request(req)
end
bail(msg) click to toggle source
# File lib/sensu-handler.rb, line 73
def bail(msg)
  puts msg + ': ' + @event['client']['name'] + '/' + @event['check']['name']
  exit 0
end
event_exists?(client, check) click to toggle source
# File lib/sensu-handler.rb, line 142
def event_exists?(client, check)
  api_request(:GET, '/event/' + client + '/' + check).code == '200'
end
event_summary(trim_at=100) click to toggle source

Helpers and filters.

# File lib/sensu-handler.rb, line 61
def event_summary(trim_at=100)
  summary = @event['check']['notification'] || @event['check']['description']
  if summary.nil?
    source = @event['check']['source'] || @event['client']['name']
    event_context = [source, @event['check']['name']].join('/')
    output = @event['check']['output'].chomp
    output = output.length > trim_at ? output[0..trim_at] + '...' : output
    summary = [event_context, output].join(' : ')
  end
  summary
end
filter() click to toggle source

Filters exit the proccess if the event should not be handled. Implementation of the default filters is below.

# File lib/sensu-handler.rb, line 28
def filter
  filter_disabled
  filter_repeated
  filter_silenced
  filter_dependencies
end
filter_dependencies() click to toggle source
# File lib/sensu-handler.rb, line 146
def filter_dependencies
  if @event['check'].has_key?('dependencies')
    if @event['check']['dependencies'].is_a?(Array)
      @event['check']['dependencies'].each do |dependency|
        begin
          timeout(2) do
            check, client = dependency.split('/').reverse
            if event_exists?(client || @event['client']['name'], check)
              bail 'check dependency event exists'
            end
          end
        rescue Timeout::Error
          puts 'timed out while attempting to query the sensu api for an event'
        end
      end
    end
  end
end
filter_disabled() click to toggle source
# File lib/sensu-handler.rb, line 88
def filter_disabled
  if @event['check']['alert'] == false
    bail 'alert disabled'
  end
end
filter_repeated() click to toggle source
# File lib/sensu-handler.rb, line 94
def filter_repeated
  defaults = {
    'occurrences' => 1,
    'interval' => 30,
    'refresh' => 1800
  }

  if settings['sensu_plugin'].is_a?(Hash)
    defaults.merge!(settings['sensu_plugin'])
  end

  occurrences = (@event['check']['occurrences'] || defaults['occurrences']).to_i
  interval = (@event['check']['interval'] || defaults['interval']).to_i
  refresh = (@event['check']['refresh'] || defaults['refresh']).to_i
  if @event['occurrences'] < occurrences
    bail 'not enough occurrences'
  end
  if @event['occurrences'] > occurrences && @event['action'] == 'create'
    number = refresh.fdiv(interval).to_i
    unless number == 0 || @event['occurrences'] % number == 0
      bail 'only handling every ' + number.to_s + ' occurrences'
    end
  end
end
filter_silenced() click to toggle source
# File lib/sensu-handler.rb, line 123
def filter_silenced
  stashes = [
    ['client', '/silence/' + @event['client']['name']],
    ['check', '/silence/' + @event['client']['name'] + '/' + @event['check']['name']],
    ['check', '/silence/all/' + @event['check']['name']]
  ]
  stashes.each do |(scope, path)|
    begin
      timeout(2) do
        if stash_exists?(path)
          bail scope + ' alerts silenced'
        end
      end
    rescue Timeout::Error
      puts 'timed out while attempting to query the sensu api for a stash'
    end
  end
end
handle() click to toggle source

Implementing classes should override this.

# File lib/sensu-handler.rb, line 21
def handle
  puts 'ignoring event -- no handler defined'
end
stash_exists?(path) click to toggle source
# File lib/sensu-handler.rb, line 119
def stash_exists?(path)
  api_request(:GET, '/stash' + path).code == '200'
end