Class: DeadBro::Monitor

Inherits:
Object
  • Object
show all
Defined in:
lib/dead_bro/monitor.rb

Constant Summary collapse

SLEEP_INTERVAL_SECONDS = 
60

Instance Method Summary collapse

Constructor Details

#initialize(client: DeadBro.client) ⇒ Monitor

Returns a new instance of Monitor.



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# File 'lib/dead_bro/monitor.rb', line 7

def initialize(client: DeadBro.client)
  @client = client
  @thread = nil
  @running = false
  @stop_mutex = Mutex.new
  @stop_cv = ConditionVariable.new
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/dead_bro/monitor.rb', line 15

def start
  # Live thread already running — nothing to do.
  return if @running && @thread&.alive?

  # Reset: handles post-fork where @running=true but the thread is dead.
  @running = false

  return unless DeadBro.configuration.enabled

  @running = true
  @thread = Thread.new do
    Thread.current.abort_on_exception = false

    # Fetch initial settings before the first collection tick so processes
    # that haven't yet posted any metrics (e.g. Sidekiq at boot) still get
    # monitor_enabled and other remote settings from the backend.
    begin
      @client.post_heartbeat(sync: true)
    rescue => e
      log_error("Error fetching initial settings: #{e.message}")
    end

    loop do
      break unless @running

      begin
        collect_and_send_stats
      rescue => e
        log_error("Error collecting stats: #{e.message}")
      end

      # Interruptible sleep — stop() signals the CV so shutdown doesn't
      # block up to a full minute. Still naps the full interval during
      # normal operation.
      @stop_mutex.synchronize do
        @stop_cv.wait(@stop_mutex, SLEEP_INTERVAL_SECONDS) if @running
      end
    end
  end

  @thread
end

#stop ⇒ Object 



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# File 'lib/dead_bro/monitor.rb', line 58

def stop
  @running = false
  @stop_mutex.synchronize { @stop_cv.broadcast }
  @thread&.join(5) # Safety timeout in case the thread is mid-flight
  @thread = nil
end