call

in lib/aws-xray-sdk/facets/rack.rb [17:62]

• 35 lines of code
• 4 McCabe index (conditional complexity)

      def call(env)
        header = construct_header(headers: env)
        req = ::Rack::Request.new(env)

        
        host = req.host
        url_path = req.path
        method = req.request_method
        
        seg_name = @recorder.segment_naming.provide_name(host: req.host)

        
        sampled = should_sample?(
          header_obj: header, recorder: @recorder, sampling_req:
          { host: host, http_method: method, url_path: url_path, service: seg_name }
        )

        
        segment = @recorder.begin_segment seg_name, trace_id: header.root, parent_id: header.parent_id,
                                                    sampled: sampled

        
        req_meta = extract_request_meta(req)
        segment.merge_http_request request: req_meta unless req_meta.empty?
        begin
          status, headers, body = @app.call env
          resp_meta = {}
          resp_meta[:status] = status
          
          resp_obj = ::Rack::Response.new body: body, status: status, headers: headers
          if len = resp_obj.content_length
            resp_meta[:content_length] = len
          end
          segment.merge_http_response response: resp_meta
          trace_header = {TRACE_HEADER => TraceHeader.from_entity(entity: segment).root_string}
          headers.merge!(trace_header)
          [status, headers, body]
        rescue Exception => e
          segment.apply_status_code status: 500
          segment.add_exception exception: e
          raise e
        ensure
          @recorder.end_segment
        end
      end