add comments

cmd/protoc-gen-go-grpc/grpc.go

@@ -187,6 +187,13 @@ func generateFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.
 	}
 }
 
+func copyCommentsFromProto(g *protogen.GeneratedFile, service *protogen.Service) {
+	// add line for vscode dosn't display top of comment
+	g.P()
+	// print comment without '\n', if comment has '\n', vscode dosn't display it
+	g.P(strings.TrimSpace(service.Comments.Leading.String()))
+}
+
 func genService(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, service *protogen.Service) {
 	// Full methods constants.
 	helper.genFullMethods(g, service)
@@ -197,9 +204,9 @@ func genService(gen *protogen.Plugin, file *protogen.File, g *protogen.Generated
 	g.P("// ", clientName, " is the client API for ", service.GoName, " service.")
 	g.P("//")
 	g.P("// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.")
-	g.P() // for vscode dosn't display top of comment
-	// print comment without '\n', if comment has '\n', vscode dosn't display it
-	g.P(strings.TrimSpace(service.Comments.Leading.String()))
+
+	// copy comments from proto file
+	copyCommentsFromProto(g, service)
 
 	if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
 		g.P("//")
@@ -254,9 +261,9 @@ func genService(gen *protogen.Plugin, file *protogen.File, g *protogen.Generated
 	g.P("// ", serverType, " is the server API for ", service.GoName, " service.")
 	g.P("// All implementations ", mustOrShould, " embed Unimplemented", serverType)
 	g.P("// for forward compatibility")
-	g.P() // for vscode dosn't display top of comment
-	// print comment without '\n', if comment has '\n', vscode dosn't display it
-	g.P(strings.TrimSpace(service.Comments.Leading.String()))
+
+	// copy comments from proto file
+	copyCommentsFromProto(g, service)
 
 	if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
 		g.P("//")