Class: LogStash::Outputs::Nagios

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/outputs/nagios.rb

Constant Summary collapse

NAGIOS_CRITICAL = 
2
NAGIOS_WARN = 
1

Instance Attribute Summary

Attributes inherited from Base

#logger

Instance Method Summary collapse

Constructor Details

#initialize(url, config = {}, &block) ⇒ Nagios

Returns a new instance of Nagios.

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# File 'lib/logstash/outputs/nagios.rb', line 9

def initialize(url, config={}, &block)
  super

  if @url.path == "" or @url.path == "/"
    @cmdfile = "/var/lib/nagios3/rw/nagios.cmd"
  else
    @cmdfile = @url.path
  end
end

Instance Method Details

#receive(event) ⇒ Object

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# File 'lib/logstash/outputs/nagios.rb', line 25

def receive(event)
  if !File.exists?(@cmdfile)
    @logger.warn(["Skipping nagios output; command file is missing",
                 {"cmdfile" => @cmdfile, "missed_event" => event}])
    return
  end

  # TODO(petef): if nagios_host/nagios_service both have more than one
  # value, send multiple alerts. They will have to match up together by
  # array indexes (host/service combos) and the arrays must be the same
  # length.

  host = event.fields["nagios_host"]
  if !host
    @logger.warn(["Skipping nagios output; nagios_host field is missing",
                 {"missed_event" => event}])
    return
  end

  service = event.fields["nagios_service"]
  if !service
    @logger.warn(["Skipping nagios output; nagios_service field is missing",
                 {"missed_event" => event}])
    return
  end

  annotation = event.fields["nagios_annotation"]
  level = NAGIOS_CRITICAL
  if event.fields["nagios_level"] and event.fields["nagios_level"][0].downcase == "warn"
    level = NAGIOS_WARN
  end

  cmd = "[#{Time.now.to_i}] PROCESS_SERVICE_CHECK_RESULT;#{host[0]};#{service[0]};#{level};"
  if annotation
    cmd += "#{annotation[0]}: "
  end
  cmd += "#{event.source}: "
  # In the multi-line case, escape the newlines for the nagios command file
  cmd += event.message.gsub("\n", "\\n")

  @logger.debug({"cmdfile" => @cmdfile, "nagios_command" => cmd})
  begin
    File.open(@cmdfile, "a") do |f|
      f.puts cmd
    end
  rescue
    @logger.warn(["Skipping nagios output; error writing to command file",
                 {"error" => $!, "cmdfile" => @cmdfile,
                  "missed_event" => event}])
  end
end

#register ⇒ Object

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# File 'lib/logstash/outputs/nagios.rb', line 20

def register
  # nothing to do
end