Class: Scout::Streamer

Inherits:
Object
  • Object
show all
Defined in:
lib/scout/streamer.rb

Constant Summary collapse

MAX_DURATION =

will shut down automatically after this many seconds

60*30
SLEEP = 
1

Instance Method Summary collapse

Constructor Details

#initialize(history_file, streaming_key, p_app_id, p_key, p_secret, plugin_ids, system_metric_collectors, hostname, http_proxy, logger = nil) ⇒ Streamer

  • history_file is the path to the history file

  • plugin_ids is an array of integers



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# File 'lib/scout/streamer.rb', line 12

def initialize(history_file, streaming_key, p_app_id, p_key, p_secret, plugin_ids, system_metric_collectors, hostname, http_proxy, logger = nil)
  @@continue_streaming = true
  @history_file = history_file
  @history      = Hash.new
  @logger       = logger

  @plugin_hashes = []

  Pusher.app_id=p_app_id
  Pusher.key=p_key
  Pusher.secret=p_secret
  Pusher.http_proxy = http_proxy if http_proxy !=""

  #[[:app_id,p_app_id],[:key,p_key],[:secret,p_secret]].each { |p| Pusher.send p.first, p.last}

  streamer_start_time = Time.now

  info("Streamer PID=#{$$} starting")

  # load plugin history
  load_history

  # get the array of plugins, AKA the plugin plan
  @all_plugins = Array(@history["old_plugins"])
  info("Starting streamer with key=#{streaming_key} and plugin_ids: #{plugin_ids.inspect}. System metric collectors: #{system_metric_collectors.inspect}. #{@history_file} includes plugin ids #{@all_plugins.map{|p|p['id']}.inspect}. http_proxy = #{http_proxy}")

  # selected_plugins is subset of the @all_plugins -- those selected in plugin_ids
  selected_plugins = compile_plugins(@all_plugins, plugin_ids)


  # main loop. Continue running until global $continue_streaming is set to false OR we've been running for MAX DURATION
  iteration=1 # use this to log the data at a couple points
  while(streamer_start_time+MAX_DURATION > Time.now && @@continue_streaming) do
    plugins = gather_plugin_reports(selected_plugins)

    system_metric_data = gather_system_metric_reports(system_metric_collectors)

    bundle={:hostname=>hostname,
             :server_time=>Time.now.strftime("%I:%M:%S %p"),
             :server_unixtime => Time.now.to_i,
             :num_processes=>`ps -e | wc -l`.chomp.to_i,
             :plugins=>plugins, 
             :system_metrics => system_metric_data}

    # stream the data via pusherapp
    begin
      Pusher[streaming_key].trigger!('server_data', bundle)
    rescue Pusher::Error => e
      # (Pusher::AuthenticationError, Pusher::HTTPError, or Pusher::Error)
      error "Error pushing data: #{e.message}"
    end

    if iteration == 2 || iteration == 100
      info "Run #{iteration} data dump:"
      info bundle.inspect
    end

    sleep(SLEEP)
    iteration+=1
  end

  info("Streamer PID=#{$$} ending.")

  # remove the pid file before exiting
  streamer_pid_file=File.join(File.dirname(history_file),"scout_streamer.pid")
  File.unlink(streamer_pid_file) if File.exist?(streamer_pid_file)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object (private)

Forward Logger methods to an active instance, when there is one.



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# File 'lib/scout/streamer.rb', line 219

def method_missing(meth, *args, &block)
  if (Logger::SEV_LABEL - %w[ANY]).include? meth.to_s.upcase
    @logger.send(meth, *args, &block) unless @logger.nil?
  else
    super
  end
end