From 19f305b510bdd086cee3341bd5347c6dc3375467 Mon Sep 17 00:00:00 2001
From: "R.I.Pienaar" <rip@devco.net>
Date: Wed, 15 Mar 2023 12:07:00 +0100
Subject: [PATCH] [ADDED] Endpoint metadata to endpoint stats (#1233)

Signed-off-by: R.I.Pienaar <rip@devco.net>
---
 micro/service.go           | 28 ++++++++++++++++------------
 micro/test/service_test.go | 10 ++++++++--
 2 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/micro/service.go b/micro/service.go
index 79f0cc94e..ed151b893 100644
--- a/micro/service.go
+++ b/micro/service.go
@@ -108,14 +108,15 @@ type (
 
 	// EndpointStats contains stats for a specific endpoint.
 	EndpointStats struct {
-		Name                  string          `json:"name"`
-		Subject               string          `json:"subject"`
-		NumRequests           int             `json:"num_requests"`
-		NumErrors             int             `json:"num_errors"`
-		LastError             string          `json:"last_error"`
-		ProcessingTime        time.Duration   `json:"processing_time"`
-		AverageProcessingTime time.Duration   `json:"average_processing_time"`
-		Data                  json.RawMessage `json:"data,omitempty"`
+		Name                  string            `json:"name"`
+		Subject               string            `json:"subject"`
+		Metadata              map[string]string `json:"metadata"`
+		NumRequests           int               `json:"num_requests"`
+		NumErrors             int               `json:"num_errors"`
+		LastError             string            `json:"last_error"`
+		ProcessingTime        time.Duration     `json:"processing_time"`
+		AverageProcessingTime time.Duration     `json:"average_processing_time"`
+		Data                  json.RawMessage   `json:"data,omitempty"`
 	}
 
 	// Ping is the response type for PING monitoring endpoint.
@@ -465,8 +466,9 @@ func addEndpoint(s *service, name, subject string, handler Handler, schema *Sche
 	endpoint.subscription = sub
 	s.endpoints = append(s.endpoints, endpoint)
 	endpoint.stats = EndpointStats{
-		Name:    name,
-		Subject: subject,
+		Name:     name,
+		Subject:  subject,
+		Metadata: endpoint.Metadata,
 	}
 	return nil
 }
@@ -731,6 +733,7 @@ func (s *service) Stats() Stats {
 		endpointStats := &EndpointStats{
 			Name:                  endpoint.stats.Name,
 			Subject:               endpoint.stats.Subject,
+			Metadata:              endpoint.stats.Metadata,
 			NumRequests:           endpoint.stats.NumRequests,
 			NumErrors:             endpoint.stats.NumErrors,
 			LastError:             endpoint.stats.LastError,
@@ -845,8 +848,9 @@ func (e *Endpoint) stop() error {
 
 func (e *Endpoint) reset() {
 	e.stats = EndpointStats{
-		Name:    e.stats.Name,
-		Subject: e.stats.Subject,
+		Name:     e.stats.Name,
+		Subject:  e.stats.Subject,
+		Metadata: e.stats.Metadata,
 	}
 }
 
diff --git a/micro/test/service_test.go b/micro/test/service_test.go
index d168fbed9..2dae0e1b0 100644
--- a/micro/test/service_test.go
+++ b/micro/test/service_test.go
@@ -1159,8 +1159,9 @@ func TestServiceStats(t *testing.T) {
 				Version: "0.1.0",
 				APIURL:  "http://someapi.com/v1",
 				Endpoint: &micro.EndpointConfig{
-					Subject: "test.func",
-					Handler: micro.HandlerFunc(handler),
+					Subject:  "test.func",
+					Handler:  micro.HandlerFunc(handler),
+					Metadata: map[string]string{"test": "value"},
 					Schema: &micro.Schema{
 						Request:  "some_request",
 						Response: "some_response",
@@ -1278,6 +1279,11 @@ func TestServiceStats(t *testing.T) {
 			if stats.Type != micro.StatsResponseType {
 				t.Errorf("Invalid response type; want: %s; got: %s", micro.StatsResponseType, stats.Type)
 			}
+			if test.config.Endpoint != nil && test.config.Endpoint.Metadata != nil {
+				if !reflect.DeepEqual(test.config.Endpoint.Metadata, stats.Endpoints[0].Metadata) {
+					t.Errorf("invalid endpoint metadata: %v", stats.Endpoints[0].Metadata)
+				}
+			}
 
 			if test.expectedStats != nil {
 				var data map[string]interface{}