A new interface is added to the server generated file

protoc-gen-tinyrpc/main.go

@@ -42,12 +42,23 @@ func (md *rpc) Generate(plugin *protogen.Plugin) error {
 		}
 		fileName := f.GeneratedFilenamePrefix + ".svr.go"
 		t := plugin.NewGeneratedFile(fileName, f.GoImportPath)
-		t.P("// Code generated by protoc-gen-tinyrpc.")
+		t.P("// Code generated by protoc-gen-tinyrpc. DO NOT EDIT.")
 		t.P()
 		pkg := fmt.Sprintf("package %s", f.GoPackageName)
 		t.P(pkg)
 		t.P()
 		for _, s := range f.Services {
+			comment := fmt.Sprintf("// %sServer You need to define a struct to implement these methods and then call them\n", s.Desc.Name())
+			serviceInterface := fmt.Sprintf("%stype %sServer interface{",
+				comment, s.Desc.Name())
+			t.P(serviceInterface)
+			for _, m := range s.Methods {
+				funcCode := fmt.Sprintf("%s(args *%s, reply *%s) error",
+					m.Desc.Name(), m.Input.Desc.Name(), m.Output.Desc.Name())
+				t.P(funcCode)
+			}
+			t.P("}")
+
 			serviceCode := fmt.Sprintf(`%stype %s struct{}`,
 				getComments(s.Comments), s.Desc.Name())
 			t.P(serviceCode)