Module: DeadBro::HttpInstrumentation

Defined in:
lib/dead_bro/http_instrumentation.rb

Constant Summary collapse

EVENT_NAME = 
"outgoing.http"
THREAD_LOCAL_KEY = 
:dead_bro_http_events
MAX_TRACKED_EVENTS = 
1000

Class Method Summary collapse

Class Method Details

.install!(client: Client.new) ⇒ Object 



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# File 'lib/dead_bro/http_instrumentation.rb', line 12

def self.install!(client: Client.new)
  install_net_http!(client)
  install_typhoeus!(client) if defined?(::Typhoeus)
rescue
  # Never raise from instrumentation install
end

.install_net_http!(client) ⇒ Object 



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# File 'lib/dead_bro/http_instrumentation.rb', line 19

def self.install_net_http!(client)
  mod = Module.new do
    define_method(:request) do |req, body = nil, &block|
      start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
      response = nil
      error = nil
      begin
        response = super(req, body, &block)
        response
      rescue Exception => e
        error = e
        raise
      ensure
        finish_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
        duration_ms = ((finish_time - start_time) * 1000.0).round(2)
        begin
          uri = begin
            URI.parse(req.uri ? req.uri.to_s : "http://#{@address}:#{@port}#{req.path}")
          rescue
            nil
          end

          # Skip instrumentation for our own APM endpoint to prevent infinite loops,
          # but do NOT alter the original method's return value/control flow.
          skip_instrumentation = uri && (uri.to_s.include?("localhost") || uri.to_s.include?("aberatii.com"))

          unless skip_instrumentation
            payload = {
              library: "net_http",
              method: req.method,
              url: uri && uri.to_s,
              host: (uri && uri.host) || @address,
              path: (uri && uri.path) || req.path,
              status: response && response.code.to_i,
              duration_ms: duration_ms,
              exception: error && error.class.name
            }
            # Accumulate per-request; only send with controller metric
            if Thread.current[THREAD_LOCAL_KEY] && should_continue_tracking?
              Thread.current[THREAD_LOCAL_KEY] << payload
            end
          end
        rescue
        end
      end
    end
  end

  ::Net::HTTP.prepend(mod) unless ::Net::HTTP.ancestors.include?(mod)
end

.install_typhoeus!(client) ⇒ Object 



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# File 'lib/dead_bro/http_instrumentation.rb', line 70

def self.install_typhoeus!(client)
  mod = Module.new do
    define_method(:run) do |*args|
      start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
      response = nil
      begin
        response = super(*args)
        response
      ensure
        finish_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
        duration_ms = ((finish_time - start_time) * 1000.0).round(2)
        begin
          req_url = if respond_to?(:url)
            url
          else
            (respond_to?(:base_url) ? base_url : nil)
          end

          # Skip instrumentation for our own APM endpoint to prevent infinite loops,
          # but do NOT alter the original method's return value/control flow.
          skip_instrumentation = req_url && (req_url.include?("localhost:3100/apm/v1/metrics") || req_url.include?("deadbro.aberatii.com/apm/v1/metrics"))

          unless skip_instrumentation
            payload = {
              library: "typhoeus",
              method: (respond_to?(:options) && options[:method]) ? options[:method].to_s.upcase : nil,
              url: req_url,
              status: response && response.code,
              duration_ms: duration_ms
            }
            # Accumulate per-request; only send with controller metric
            if Thread.current[THREAD_LOCAL_KEY] && should_continue_tracking?
              Thread.current[THREAD_LOCAL_KEY] << payload
            end
          end
        rescue
        end
      end
    end
  end

  ::Typhoeus::Request.prepend(mod) unless ::Typhoeus::Request.ancestors.include?(mod)
rescue
end

.should_continue_tracking? ⇒ Boolean

Check if we should continue tracking based on count and time limits

Returns:

  • (Boolean) 


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# File 'lib/dead_bro/http_instrumentation.rb', line 116

def self.should_continue_tracking?
  events = Thread.current[THREAD_LOCAL_KEY]
  return false unless events

  # Check count limit
  return false if events.length >= MAX_TRACKED_EVENTS

  # Check time limit
  start_time = Thread.current[DeadBro::TRACKING_START_TIME_KEY]
  if start_time
    elapsed_seconds = Time.now - start_time
    return false if elapsed_seconds >= DeadBro::MAX_TRACKING_DURATION_SECONDS
  end

  true
end