add optional metadata to service

go.mod

@@ -3,6 +3,9 @@ module github.com/nats-io/nats.go
 go 1.16
 
 require (
+	github.com/golang/protobuf v1.5.0
+	github.com/nats-io/nats-server/v2 v2.9.10 // indirect
 	github.com/nats-io/nkeys v0.3.0
 	github.com/nats-io/nuid v1.0.1
-)
+	google.golang.org/protobuf v1.28.1
+)

go.sum

@@ -1,11 +1,70 @@
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micro/service.go

@@ -57,11 +57,15 @@ type (
 	// It should return a value which can be serialized to JSON.
 	StatsHandler func(Endpoint) interface{}
 
+	// Metadata allows to add optional metadatas to ServiceIdentity
+	Metadata map[string]interface{}
+
 	// ServiceIdentity contains fields helping to identidy a service instance.
 	ServiceIdentity struct {
-		Name    string `json:"name"`
-		ID      string `json:"id"`
-		Version string `json:"version"`
+		Name    string   `json:"name"`
+		ID      string   `json:"id"`
+		Version string   `json:"version"`
+		Meta    Metadata `json:"meta,omitempty"`
 	}
 
 	// Stats is the type returned by STATS monitoring endpoint.
@@ -116,6 +120,7 @@ type (
 		Description  string   `json:"description"`
 		Schema       Schema   `json:"schema"`
 		Endpoint     Endpoint `json:"endpoint"`
+		Meta         Metadata `json:"meta,omitempty"`
 		StatsHandler StatsHandler
 		DoneHandler  DoneHandler
 		ErrorHandler ErrHandler
@@ -237,6 +242,7 @@ func AddService(nc *nats.Conn, config Config) (Service, error) {
 		Name:    config.Name,
 		ID:      id,
 		Version: config.Version,
+		Meta:    config.Meta,
 	}
 	svc.verbSubs = make(map[string]*nats.Subscription)
 	svc.stats = &Stats{

micro/service_test.go

@@ -441,7 +441,8 @@ func TestAddService(t *testing.T) {
 			}
 
 			test.expectedPing.ID = info.ID
-			if test.expectedPing != ping {
+			//if test.expectedPing != ping {
+			if !reflect.DeepEqual(test.expectedPing, ping) {
 				t.Fatalf("Invalid ping response; want: %+v; got: %+v", test.expectedPing, ping)
 			}