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 Method Summary collapse

Class Method Details

.build_tags(context) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 39

def self.build_tags(context)
  tags = {
    'component' => 'ruby-lambda-wrapper',
    'lambda_arn' => context.invoked_function_arn,
    'aws_request_id' => context.aws_request_id,
    'aws_function_name' => context.function_name,
    'aws_function_version' => context.function_version,
    'aws_execution_env' => ENV['AWS_EXECUTION_ENV'],
    'log_group_name' => context.log_group_name,
    'log_stream_name' => context.log_stream_name,
    'function_wrapper_version' => "signalfx-lambda-#{SignalFx::Lambda::VERSION}",
  }

  tags = tags.merge(tags_from_arn(context.invoked_function_arn))
end

.init_tracer(event) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 79

def self.init_tracer(event)
  access_token = ENV['SIGNALFX_ACCESS_TOKEN']
  ingest_url = ENV['SIGNALFX_INGEST_URL'] || 'https://ingest.signalfx.com/v1/trace'
  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: 1)

  # 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 75

def self.register_handler(&handler)
  @handler = handler
end

.tags_from_arn(arn) ⇒ Object 



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# File 'lib/signalfx/lambda/tracing.rb', line 55

def self.tags_from_arn(arn)
  _, _, _, region, , resource_type, _, qualifier = arn.split(':')

  tags = {
    'aws_region' => region,
    'aws_account_id' => ,
  }

  if qualifier
    case resource_type
    when 'function'
      tags['aws_function_qualifier'] = qualifier
    when 'event-source-mappings'
      tags['event_source_mappings'] = qualifier
    end
  end

  tags
end

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



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# File 'lib/signalfx/lambda/tracing.rb', line 11

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

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

  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 35

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