Refactor the protocol payload structs

tap/extensions/amqp/helpers.go

@@ -98,7 +98,6 @@ func emitAMQP(event interface{}, _type string, method string, connectionInfo *ap
 		IsRequest:   true,
 		CaptureTime: time.Now(),
 		Payload: AMQPPayload{
-			Type: _type,
 			Data: &AMQPWrapper{
 				Method:  method,
 				Url:     "",

tap/extensions/amqp/structs.go

@@ -5,8 +5,6 @@ import (
 )
 
 type AMQPPayload struct {
-	Type   string
-	Method string
 	Data interface{}
 }
 
@@ -16,10 +14,4 @@ type AMQPPayloader interface {
 
 func (h AMQPPayload) MarshalJSON() ([]byte, error) {
 	return json.Marshal(h.Data)
-	// switch h.Type {
-	// case "amqp_request":
-	// 	return json.Marshal(h.Data)
-	// default:
-	// 	panic(fmt.Sprintf("AMQP payload cannot be marshaled: %s\n", h.Type))
-	// }
 }

tap/extensions/http/main.go

@@ -39,6 +39,11 @@ var http2Protocol api.Protocol = api.Protocol{
 	Ports:           []string{"80", "8080"},
 }
 
+const (
+	TypeHttpRequest = iota
+	TypeHttpResponse
+)
+
 func init() {
 	log.Println("Initializing HTTP extension.")
 	requestCounter = 0

tap/extensions/http/matcher.go

@@ -32,7 +32,7 @@ func (matcher *requestResponseMatcher) registerRequest(ident string, request *ht
 		IsRequest:   true,
 		CaptureTime: captureTime,
 		Payload: HTTPPayload{
-			Type: "http_request",
+			Type: TypeHttpRequest,
 			Data: request,
 		},
 	}
@@ -61,7 +61,7 @@ func (matcher *requestResponseMatcher) registerResponse(ident string, response *
 		IsRequest:   false,
 		CaptureTime: captureTime,
 		Payload: HTTPPayload{
-			Type: "http_response",
+			Type: TypeHttpResponse,
 			Data: response,
 		},
 	}

tap/extensions/http/structs.go

@@ -11,7 +11,7 @@ import (
 )
 
 type HTTPPayload struct {
-	Type string
+	Type uint8
 	Data interface{}
 }
 
@@ -27,7 +27,7 @@ type HTTPWrapper struct {
 
 func (h HTTPPayload) MarshalJSON() ([]byte, error) {
 	switch h.Type {
-	case "http_request":
+	case TypeHttpRequest:
 		harRequest, err := har.NewRequest(h.Data.(*http.Request), true)
 		if err != nil {
 			rlog.Debugf("convert-request-to-har", "Failed converting request to HAR %s (%v,%+v)", err, err, err)
@@ -38,7 +38,7 @@ func (h HTTPPayload) MarshalJSON() ([]byte, error) {
 			Url:     "",
 			Details: harRequest,
 		})
-	case "http_response":
+	case TypeHttpResponse:
 		harResponse, err := har.NewResponse(h.Data.(*http.Response), true)
 		if err != nil {
 			rlog.Debugf("convert-response-to-har", "Failed converting response to HAR %s (%v,%+v)", err, err, err)

tap/extensions/kafka/helpers.go

@@ -7,7 +7,6 @@ import (
 )
 
 type KafkaPayload struct {
-	Type string
 	Data interface{}
 }
 

tap/extensions/kafka/response.go

@@ -257,7 +257,6 @@ func ReadResponse(r io.Reader, tcpID *api.TcpID, emitter api.Emitter) (err error
 				IsRequest:   true,
 				CaptureTime: time.Now(),
 				Payload: KafkaPayload{
-					Type: "kafka_request",
 					Data: &KafkaWrapper{
 						Method:  apiNames[apiKey],
 						Url:     "",
@@ -269,7 +268,6 @@ func ReadResponse(r io.Reader, tcpID *api.TcpID, emitter api.Emitter) (err error
 				IsRequest:   false,
 				CaptureTime: time.Now(),
 				Payload: KafkaPayload{
-					Type: "kafka_response",
 					Data: &KafkaWrapper{
 						Method:  apiNames[apiKey],
 						Url:     "",