Class: LogStash::Outputs::Opentsdb

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

Overview

This output allows you to pull metrics from your logs and ship them to opentsdb. Opentsdb is an open source tool for storing and graphing metrics.

Instance Method Summary collapse

Instance Method Details

#connect ⇒ Object

def register



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# File 'lib/logstash/outputs/opentsdb.rb', line 39

def connect
  # TODO(sissel): Test error cases. Catch exceptions. Find fortune and glory.
  begin
    @socket = TCPSocket.new(@host, @port)
  rescue Errno::ECONNREFUSED => e
    @logger.warn("Connection refused to opentsdb server, sleeping...",
                 :host => @host, :port => @port)
    sleep(2)
    retry
  end
end

#receive(event) ⇒ Object 



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# File 'lib/logstash/outputs/opentsdb.rb', line 52

def receive(event)
  

  # Opentsdb message format: put metric timestamp value tagname=tagvalue tag2=value2\n

  # Catch exceptions like ECONNRESET and friends, reconnect on failure.
  begin
    name = metrics[0]
    value = metrics[1]
    tags = metrics[2..-1]

    # The first part of the message
    message = ['put',
               event.sprintf(name),
               event.sprintf("%{+%s}"),
               event.sprintf(value),
    ].join(" ")

    # If we have have tags we need to add it to the message
    event_tags = []
    unless tags.nil?
      Hash[*tags.flatten].each do |tag_name,tag_value|
        # Interprete variables if neccesary
        real_tag_name = event.sprintf(tag_name)
        real_tag_value =  event.sprintf(tag_value)
        event_tags << [real_tag_name , real_tag_value ].join('=')
      end
      message+=' '+event_tags.join(' ')
    end

    # TODO(sissel): Test error cases. Catch exceptions. Find fortune and glory.
    begin
      @socket.puts(message)
    rescue Errno::EPIPE, Errno::ECONNRESET => e
      @logger.warn("Connection to opentsdb server died",
                   :exception => e, :host => @host, :port => @port)
      sleep(2)
      connect
    end

    # TODO(sissel): resend on failure
    # TODO(sissel): Make 'resend on failure' tunable; sometimes it's OK to
    # drop metrics.
  end # @metrics.each
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/opentsdb.rb', line 35

def register
  connect
end