Module: SourceMonitor::Metrics

Defined in:
lib/source_monitor/metrics.rb

Class Method Summary collapse

Class Method Details

.counter(name) ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 17

def counter(name)
  counters[name.to_s]
end

.counters ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 69

def counters
  @counters ||= Hash.new(0)
end

.gauge(name, value) ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 13

def gauge(name, value)
  gauges[name.to_s] = value
end

.gauge_value(name) ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 21

def gauge_value(name)
  gauges[name.to_s]
end

.gauges ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 73

def gauges
  @gauges ||= {}
end

.increment(name, value = 1) ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 9

def increment(name, value = 1)
  counters[name.to_s] += value
end

.reset! ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 29

def reset!
  @counters = Hash.new(0)
  @gauges = {}
end

.setup_subscribers! ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 34

def setup_subscribers!
  return if defined?(@subscribed) && @subscribed

  ActiveSupport::Notifications.subscribe("source_monitor.fetch.start") do |_name, _start, _finish, _id, payload|
    increment(:fetch_started_total)
    gauge(:last_fetch_source_id, payload[:source_id]) if payload.key?(:source_id)
  end

  ActiveSupport::Notifications.subscribe("source_monitor.fetch.finish") do |_name, start, finish, _id, payload|
    increment(:fetch_finished_total)
    success = payload.fetch(:success, true)
    if success
      increment(:fetch_success_total)
    else
      increment(:fetch_failure_total)
    end

    duration_ms = payload[:duration_ms] || ((finish - start) * 1000.0).round(2)
    gauge(:last_fetch_duration_ms, duration_ms)
  end

  ActiveSupport::Notifications.subscribe("source_monitor.scheduler.run") do |_name, start, finish, _id, payload|
    enqueued = payload[:enqueued_count].to_i
    duration_ms = payload[:duration_ms] || ((finish - start) * 1000.0).round(2)

    increment(:scheduler_runs_total)
    increment(:scheduler_sources_enqueued_total, enqueued)
    gauge(:scheduler_last_enqueued_count, enqueued)
    gauge(:scheduler_last_duration_ms, duration_ms)
    gauge(:scheduler_last_run_at_epoch, finish.to_f)
  end

  @subscribed = true
end

.snapshot ⇒ Object 



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# File 'lib/source_monitor/metrics.rb', line 25

def snapshot
  { counters: counters.dup, gauges: gauges.dup }
end