modify cmd/proto-gen-go-errors (#1035)

* modify cmd/proto-gen-go-errors

cmd/protoc-gen-go-errors/errors.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"strings"
 
 	"github.com/go-kratos/kratos/cmd/protoc-gen-go-errors/v2/errors"
@@ -15,13 +16,7 @@ const (
 
 // generateFile generates a _http.pb.go file containing kratos errors definitions.
 func generateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile {
-	var hasCode bool
-	for _, enum := range file.Enums {
-		if code := defaultErrorCode(enum); code > 0 {
-			hasCode = true
-		}
-	}
-	if len(file.Enums) == 0 || !hasCode {
+	if len(file.Enums) == 0 {
 		return nil
 	}
 	filename := file.GeneratedFilenamePrefix + "_errors.pb.go"
@@ -45,42 +40,59 @@ func generateFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.
 	g.P("// is compatible with the kratos package it is being compiled against.")
 	g.P("const _ = ", errorsPackage.Ident("SupportPackageIsVersion1"))
 	g.P()
+	index := 0
 	for _, enum := range file.Enums {
-		genErrorsReason(gen, file, g, enum)
+		skip := genErrorsReason(gen, file, g, enum)
+		if skip == false {
+			index++
+		}
+	}
+	// If all enums do not contain 'errors.code', the current file is skipped
+	if index == 0 {
+		g.Skip()
 	}
 }
 
-func defaultErrorCode(enum *protogen.Enum) int {
+func genErrorsReason(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, enum *protogen.Enum) bool {
 	defaultCode := proto.GetExtension(enum.Desc.Options(), errors.E_DefaultCode)
-	if code, ok := defaultCode.(int32); ok && code > 0 {
-		return int(code)
+	code := 0
+	if v, ok := defaultCode.(int32); ok {
+		code = int(v)
+	}
+	if code > 600 || code < 0 {
+		panic(fmt.Sprintf("Enum '%s' range must be greater than 0 and less than or equal to 600", string(enum.Desc.Name())))
 	}
-	return 0
-}
-
-func genErrorsReason(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, enum *protogen.Enum) {
 	var ew errorWrapper
-	defCode := defaultErrorCode(enum)
 	for _, v := range enum.Values {
-		code := int(proto.GetExtension(v.Desc.Options(), errors.E_Code).(int32))
-		if code == 0 {
-			code = defCode
+		enumCode := code
+		eCode := proto.GetExtension(v.Desc.Options(), errors.E_Code)
+		if v, ok := eCode.(int32); ok {
+			enumCode = int(v)
 		}
-		if code > 600 || code < 200 {
-			panic("httpstatus code must be greater than or equal to 200 and less than 600")
+		// If the current enumeration does not contain 'errors.code'
+		//or the code value exceeds the range, the current enum will be skipped
+		if enumCode > 600 || enumCode < 0 {
+			panic(fmt.Sprintf("Enum '%s' range must be greater than 0 and less than or equal to 600", string(v.Desc.Name())))
+		}
+		if enumCode == 0 {
+			continue
 		}
 		err := &errorInfo{
 			Name:       string(enum.Desc.Name()),
 			Value:      string(v.Desc.Name()),
-			CamelValue: case2Camel(string(v.Desc.Name())),
-			HttpCode:   code,
+			CamelValue: Case2Camel(string(v.Desc.Name())),
+			HttpCode:   enumCode,
 		}
 		ew.Errors = append(ew.Errors, err)
 	}
+	if len(ew.Errors) == 0 {
+		return true
+	}
 	g.P(ew.execute())
+	return false
 }
 
-func case2Camel(name string) string {
+func Case2Camel(name string) string {
 	if !strings.Contains(name, "_") {
 		return name
 	}