Module: SignalFx::Lambda::Tracing

Defined in:
lib/signalfx/lambda/tracing.rb,
lib/signalfx/lambda/tracing/extractors.rb

Defined Under Namespace

Classes: B3CodecCommon, B3RackCodec, B3TextMapCodec, Error

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.reporter ⇒ Object

Returns the value of attribute reporter.



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

def reporter
  @reporter
end

.tracer ⇒ Object

Returns the value of attribute tracer.



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

def tracer
  @tracer
end

Class Method Details

.get_ingest_url ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 82

def get_ingest_url
  return ENV['SIGNALFX_TRACING_URL'] if ENV.key? 'SIGNALFX_TRACING_URL'
  return ENV['SIGNALFX_ENDPOINT_URL'] + '/v1/trace' if ENV.key? 'SIGNALFX_ENDPOINT_URL'
  return 'https://ingest.signalfx.com/v1/trace'
end

.init_tracer(event) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 51

def init_tracer(event)
  access_token = ENV['SIGNALFX_ACCESS_TOKEN']
  ingest_url = get_ingest_url
  service_name = ENV['SIGNALFX_SERVICE_NAME'] || event.function_name
  @span_prefix = ENV['SIGNALFX_SPAN_PREFIX'] || 'lambda_ruby_'

  # configure the trace reporter
  headers = { }
  headers['X-SF-Token'] = access_token if !access_token.empty?
  encoder = Jaeger::Client::Encoders::ThriftEncoder.new(service_name: service_name)
  sender = Jaeger::Client::HttpSender.new(url: ingest_url, headers: headers, encoder: encoder, logger: Logger.new(STDOUT))
  @reporter = Jaeger::Client::Reporters::RemoteReporter.new(sender: sender, flush_interval: 100)

  # propagation format configuration
  injectors = {
    OpenTracing::FORMAT_TEXT_MAP => [Jaeger::Client::Injectors::B3RackCodec]
  }
  extractors = {
    OpenTracing::FORMAT_TEXT_MAP => [SignalFx::Lambda::Tracing::B3TextMapCodec]
  }

  OpenTracing.global_tracer = Jaeger::Client.build(
    service_name: service_name,
    reporter: @reporter,
    injectors: injectors,
    extractors: extractors
  )

  @tracer = OpenTracing.global_tracer
end

.register_handler(&handler) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 47

def register_handler(&handler)
  @handler = handler
end

.wrap_function(event:, context:, &block) ⇒ Object 



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

def wrap_function(event:, context:, &block)
  init_tracer(event) if !@tracer # avoid initializing except on a cold start

  tags = SignalFx::Lambda.fields
  tags['component'] = SignalFx::Lambda::COMPONENT
  tags['span.kind'] = 'server'

  scope = OpenTracing.start_active_span("#{@span_prefix}#{context.function_name}",
                                        tags: tags)

  response = yield event: event, context: context
  scope.span.set_tag("http.status_code", response[:statusCode]) if response[:statusCode]

  response
rescue => error
  if scope
    scope.span.set_tag("error", true)
    scope.span.log_kv(key: "message", value: error.message)
  end

  # pass this error up
  raise
ensure
  scope.close if scope

  # flush the spans before leaving the execution context
  @reporter.flush
end

.wrapped_handler(event:, context:) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 43

def wrapped_handler(event:, context:)
  wrap_function(event, context, &@handler)
end