Class: Lognotifier::Application

Inherits:
Object
  • Object
show all
Defined in:
lib/lognotifier/application.rb

Constant Summary collapse

CONFIG_FILE = 
'/etc/lognotifier.yaml'

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Application

Returns a new instance of Application.



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# File 'lib/lognotifier/application.rb', line 7

def initialize
  # Load configuration:
  begin
    @config = YAML.load(File.read CONFIG_FILE)
  rescue => e
    puts 'Error at opening config file, error was:'
    puts e.message
    exit 1
  end

  # Initializa logger:
  @logger = Logger.new @config['logfile']

  # Main exec loop
  run
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/lognotifier/application.rb', line 24

def run
  @logger.info 'Starting lognotifierd'

  threads = []
  @config['pagerduty'].each do |conf|

    threads << Thread.new do

      # Variables:
      filename = conf[0]
      config = conf[1]

      # Initialize pager duty:
      pagerduty = Pagerduty.new(config['servicekey'])

      # Exit if file not exists
      begin
        file = File.open(filename)
        @logger.info "Opening file #{filename} for log pattern search"
      rescue => e
        @logger.error "ERROR OPENING FILE: #{filename}"
        @logger.error "ERROR WAS: #{e.message}"
        Thread.exit
      end

      # Seek to the end of the file and watch for changes
      file.seek(0, IO::SEEK_END)
      queue = INotify::Notifier.new

      # previous to nil to record the previous line
      previous = nil

      # Watch for modified actions, read the content and alert if match
      # When alerting also send the previous line if available
      queue.watch(filename, :modify) do
        content = file.read
        config['patterns'].each do |pattern|
          next unless content.match(/#{pattern["regex"]}/)
          message = ''
          message += previous.chomp + ' | ' unless previous.nil? || previous == content
          message += content.chomp
          begin
            pagerduty.trigger("#{pattern['prefix']} #{message}")
            @logger.info("ALERT TRIGGERD - #{pattern['prefix']}: #{message}")
          rescue => e
            @logger.error("FAILED TO SEND ALERT: #{pattern['prefix']} #{message}")
            @logger.error("Error: #{e.message}")
          end
        end
        previous = content
      end
      queue.run
    end
  end
  threads.each(&:join)
end