Module: SignalFx::Lambda::Metrics

Defined in:
lib/signalfx/lambda/metrics.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

@@ephemeral_dimensions = 
Set['aws_request_id', 'log_stream_name']

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.client ⇒ Object

Returns the value of attribute client.



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# File 'lib/signalfx/lambda/metrics.rb', line 12

def client
  @client
end

Class Method Details

.init_client ⇒ Object 



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# File 'lib/signalfx/lambda/metrics.rb', line 83

def init_client
  access_token = ENV['SIGNALFX_ACCESS_TOKEN']
  ingest_endpoint = ENV['SIGNALFX_METRICS_URL'] || ENV['SIGNALFX_ENDPOINT_URL'] || 'https://ingest.signalfx.com'
  timeout = ENV['SIGNALFX_SEND_TIMEOUT'] || 1

  @client = SignalFx.new access_token, ingest_endpoint: ingest_endpoint, timeout: timeout
end

.populate_dimensions(context) ⇒ Object 



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# File 'lib/signalfx/lambda/metrics.rb', line 74

def populate_dimensions(context)
  dimensions = SignalFx::Lambda.fields
                   .reject {|key, _| @@ephemeral_dimensions.include?(key)}
                   .map do |key, val|
    { :key => key, :value => val }
  end
  dimensions.push({ :key => 'metric_source', :value => SignalFx::Lambda::COMPONENT })
end

.wrap_function(event:, context:) ⇒ Object 



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# File 'lib/signalfx/lambda/metrics.rb', line 14

def wrap_function(event:, context:)
  cold_start = @client.nil?
  init_client unless @client
  counters = []
  gauges = []

  dimensions = populate_dimensions(context)

  # time execution of next block
  start_time = Time.now
  response = yield event: event, context: context
  end_time = Time.now

  duration = ((end_time - start_time) * 1000) # duration in ms
  end_time = end_time.strftime('%s%L')

  counters.push(
    {
      :metric => 'function.invocations',
      :value => 1,
      :timestamp => end_time,
      :dimensions => dimensions
    }
  )

  counters.push(
    {
      :metric => 'function.cold_starts',
      :value => 1,
      :timestamp => end_time,
      :dimensions => dimensions
    }
  ) if cold_start

  gauges = [
    {
      :metric => 'function.duration',
      :value => duration,
      :timestamp => end_time,
      :dimensions => dimensions
    }
  ]

  response
rescue => error
  error_counter = {
    :metric => 'function.errors',
    :value => 1,
    :timestamp => end_time,
    :dimensions => dimensions
  }

  counters.push(error_counter)

  raise
ensure
  # send metrics before leaving this block
  @client.send(gauges: gauges, counters: counters) if @client
end