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generate.go
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generate.go
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package main
import (
"fmt"
"go/ast"
"log"
"os"
"sort"
"strings"
)
// 生成相应的辅助代码
func generateCode(parserResult *ParserResult, key string) {
codeTemplate := parserResult.GetCodeTemplate(key)
builder := strings.Builder{}
builder.WriteString(strings.Join(codeTemplate.Header, "\n"))
// 排序一下,避免proto文件没改动,生成的代码文件却不一样
var sortProtoList [][]*ProtoMessageStructInfo
for _, structInfoList := range parserResult.protoMap {
sortProtoList = append(sortProtoList, structInfoList)
}
sort.Slice(sortProtoList, func(i, j int) bool {
return sortProtoList[i][0].protoName < sortProtoList[j][0].protoName
})
for _, structInfoList := range sortProtoList {
for _, structInfo := range structInfoList {
if structInfo.keyComment != codeTemplate.KeyComment {
continue
}
// test.pb.go -> test
protoFileName := strings.TrimSuffix(structInfo.protoName, ".pb.go")
protoName := protoFileName
// 首字母大写
// test -> Test
ProtoName := strings.ToUpper(protoFileName[:1]) + protoFileName[1:]
messageName := structInfo.messageName
funcStr := strings.Join(codeTemplate.FuncTemplate, "\n")
// 替换掉代码模板中的关键字
funcStr = strings.ReplaceAll(funcStr, "{MessageName}", messageName)
// TestMessageXyz -> TESTMESSAGEXYZ
funcStr = strings.ReplaceAll(funcStr, "{MESSAGENAME}", strings.ToUpper(messageName))
// TestMessageXyz -> TEST_MESSAGE_XYZ
funcStr = strings.ReplaceAll(funcStr, "{MESSAGE_NAME}", CamelCaseToUpperWords(messageName, "_"))
// TEST_MESSAGE_XYZ -> TestMessageXyz
funcStr = strings.ReplaceAll(funcStr, "{CamelMessageName}", UpperWordsToCamelCase(messageName, "_", true))
// TEST_MESSAGE_XYZ -> Test_Message_Xyz
funcStr = strings.ReplaceAll(funcStr, "{Camel_Message_Name}", UpperWordsToCamelCase(messageName, "_", false))
funcStr = strings.ReplaceAll(funcStr, "{protoName}", protoName)
// test -> Test
funcStr = strings.ReplaceAll(funcStr, "{ProtoName}", ProtoName)
funcStr = strings.ReplaceAll(funcStr, "{PackageName}", structInfo.pbPackageName)
funcStr = strings.ReplaceAll(funcStr, "{Value}", structInfo.keyCommentValue)
funcStr = strings.ReplaceAll(funcStr, "{Comment}", structInfo.normalComment)
builder.WriteString(funcStr)
builder.WriteString("\n")
}
}
builder.WriteString(strings.Join(codeTemplate.Tail, "\n"))
writeErr := os.WriteFile(codeTemplate.OutFile, ([]byte)(builder.String()), 0644)
if writeErr != nil {
log.Printf("write failed:%v %v", codeTemplate.OutFile, writeErr)
} else {
log.Printf("OutFile:%v", codeTemplate.OutFile)
}
}
func generatePbReader(parserResult *ParserResult) {
readerConfig := parserResult.readerTemplates
if readerConfig.OutDir == "" && len(readerConfig.FileFilter) == 0 && len(readerConfig.MessageFilter) == 0 {
return
}
log.Printf("generatePbReader:%v files:%v messages:%v", parserResult.readerTemplates.OutDir,
readerConfig.FileFilter, readerConfig.MessageFilter)
os.Mkdir(parserResult.readerTemplates.OutDir, os.ModePerm)
// xxxReader模板
structTemplateStr := `
type {MessageName}Reader struct {
v *{MessageName}
}
func New{MessageName}Reader(src *{MessageName}) *{MessageName}Reader {
return &{MessageName}Reader{v:src}
}
`
// 普通字段模板
fieldTemplateStr := `
func (r *{MessageName}Reader) Get{FieldName}() {FieldType} {
return r.v.Get{FieldName}()
}
`
// proto2的星号字段模板
starFieldTemplateStr := `
func (r *{MessageName}Reader) Get{FieldName}() {FieldType}Reader {
return New{FieldTypeNoStar}Reader(r.v.Get{FieldName}())
}
`
// 基础类型数组字段模板
genericSliceFieldTemplateStr := `
func (r *{MessageName}Reader) Get{FieldName}() []{FieldType} {
src := r.v.Get{FieldName}()
if src == nil {
return nil
}
copySlice := make([]{FieldType},len(src))
copy(copySlice, src)
return copySlice
}
`
// 星号数组字段模板
starSliceFieldTemplateStr := `
func (r *{MessageName}Reader) Get{FieldName}() []{FieldType}Reader {
src := r.v.Get{FieldName}()
if src == nil {
return nil
}
sliceReader := make([]{FieldType}Reader,len(src))
for i,v := range src {
sliceReader[i] = New{FieldTypeNoStar}Reader(v)
}
return sliceReader
}
`
for protoName, structInfoList := range parserResult.allProto {
wholeFileMatch := len(readerConfig.FileFilter) > 0 && readerConfig.MatchFile(protoName)
builder := strings.Builder{}
builder.WriteString(strings.Join(parserResult.readerTemplates.Header, "\n"))
// proto文件是否使用了anypb.Any,自动import相关的lib
importAnyPb := hasAnyPbField(structInfoList)
if len(parserResult.readerTemplates.Import) > 0 || importAnyPb {
builder.WriteString("import (\n")
for _,v := range parserResult.readerTemplates.Import {
builder.WriteString("\t")
builder.WriteString(v)
builder.WriteString("\n")
}
if importAnyPb {
builder.WriteString("\t")
builder.WriteString("\"google.golang.org/protobuf/types/known/anypb\"")
builder.WriteString("\n")
}
builder.WriteString(")\n")
}
outMessageCount := 0
for _,structInfo := range structInfoList {
if !wholeFileMatch {
if len(readerConfig.MessageFilter) == 0 || !readerConfig.MatchMessage(structInfo.messageName) {
continue
}
}
readerStr := strings.ReplaceAll(structTemplateStr, "{MessageName}", structInfo.messageName)
builder.WriteString(readerStr)
builder.WriteString("\n")
fieldList := structInfo.structType.Fields
for _,field := range fieldList.List {
if len(field.Names) == 0 {
continue
}
fieldName := field.Names[0].Name
if !ast.IsExported(fieldName) {
continue
}
if parserResult.readerTemplates.ProtoV2 {
if fieldName == "XXX_unrecognized" {
continue
}
}
fieldNameTypeName := getTypeName(field.Type)
if fieldNameTypeName == "" {
log.Printf("%v.%v type parse error!", structInfo.messageName, fieldName)
continue
}
isStarField := isStar(field.Type)
if parserResult.readerTemplates.ProtoV2 {
// proto2的基础类型的引用类型转换成值类型
if isGenericTypeName(fieldNameTypeName, true) {
isStarField = false
fieldNameTypeName = fieldNameTypeName[1:]
}
}
fieldStr := ""
if isGenericSlice(field.Type) {
elemTypeName := getElemTypeName(field.Type)
fieldStr = strings.ReplaceAll(genericSliceFieldTemplateStr, "{MessageName}", structInfo.messageName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldName}", fieldName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldType}", elemTypeName)
} else if isStarSlice(field.Type) {
elemTypeName := getElemTypeName(field.Type)
fieldStr = strings.ReplaceAll(starSliceFieldTemplateStr, "{MessageName}", structInfo.messageName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldName}", fieldName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldType}", elemTypeName)
if elemTypeName[0] == '*' {
fieldStr = strings.ReplaceAll(fieldStr, "{FieldTypeNoStar}", elemTypeName[1:])
} else {
fieldStr = strings.ReplaceAll(fieldStr, "{FieldTypeNoStar}", elemTypeName)
}
// TODO: map[k]v的特殊处理
} else {
if isStarField {
fieldStr = strings.ReplaceAll(starFieldTemplateStr, "{MessageName}", structInfo.messageName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldName}", fieldName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldType}", fieldNameTypeName)
if fieldNameTypeName[0] == '*' {
fieldStr = strings.ReplaceAll(fieldStr, "{FieldTypeNoStar}", fieldNameTypeName[1:])
} else {
fieldStr = strings.ReplaceAll(fieldStr, "{FieldTypeNoStar}", fieldNameTypeName)
}
} else {
fieldStr = strings.ReplaceAll(fieldTemplateStr, "{MessageName}", structInfo.messageName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldName}", fieldName)
fieldStr = strings.ReplaceAll(fieldStr, "{FieldType}", fieldNameTypeName)
}
}
builder.WriteString(fieldStr)
}
outMessageCount++
}
outFileName := fmt.Sprintf("%v/%v_reader_gen.go", parserResult.readerTemplates.OutDir, strings.TrimSuffix(protoName, ".pb.go"))
if outMessageCount > 0 {
writeErr := os.WriteFile(outFileName, ([]byte)(builder.String()), 0644)
if writeErr != nil {
log.Printf("write failed:%v %v", outFileName, writeErr)
} else {
log.Printf("OutFile:%v", outFileName)
}
} else {
os.Remove(outFileName)
}
}
}
// 是否是基础类型(bool int uint float string)
func isGenericTypeName(typeName string, isStar bool) bool {
genericTypes := []string{"bool","int8","int16","int32","int64","uint8","uint16","uint32","uint64","float32","float64","string"}
for _,v := range genericTypes {
if isStar {
if typeName == fmt.Sprintf("*%v", v) {
return true
}
} else {
if typeName == v {
return true
}
}
}
return false
}
// 类型string
func getTypeName(expr ast.Expr) string {
switch typ := expr.(type) {
case *ast.Ident:
return typ.Name
case *ast.StarExpr:
return fmt.Sprintf("*%v", getTypeName(typ.X))
case *ast.SliceExpr:
return fmt.Sprintf("[]%v", getTypeName(typ.X))
case *ast.ArrayType:
return fmt.Sprintf("[]%v", getTypeName(typ.Elt))
case *ast.MapType:
return fmt.Sprintf("map[%v]%v", getTypeName(typ.Key), getTypeName(typ.Value))
case *ast.SelectorExpr:
return fmt.Sprintf("%v.%v", getTypeName(typ.X), typ.Sel.Name)
default:
log.Printf("unsupport type:%v", typ)
}
return ""
}
// 是否是[]*xxx格式的数组
func isStarSlice(expr ast.Expr) bool {
switch typ := expr.(type) {
case *ast.SliceExpr:
return isStar(typ.X)
case *ast.ArrayType:
return isStar(typ.Elt)
}
return false
}
// 是否是星号字段
func isStar(expr ast.Expr) bool {
switch expr.(type) {
case *ast.StarExpr:
return true
}
return false
}
// 是否是基础类型的数组([]int []string)
func isGenericSlice(expr ast.Expr) bool {
switch typ := expr.(type) {
case *ast.SliceExpr:
return isGenericTypeName(getTypeName(typ.X), false)
case *ast.ArrayType:
return isGenericTypeName(getTypeName(typ.Elt), false)
}
return false
}
// slice的elem类型
func getElemTypeName(expr ast.Expr) string {
switch typ := expr.(type) {
case *ast.SliceExpr:
return getTypeName(typ.X)
case *ast.ArrayType:
return getTypeName(typ.Elt)
}
return ""
}
// 是否有anypb.Any类型的字段
func hasAnyPbField(structInfoList []*ProtoMessageStructInfo) bool {
for _,structInfo := range structInfoList {
fieldList := structInfo.structType.Fields
for _,field := range fieldList.List {
if len(field.Names) == 0 {
continue
}
fieldName := field.Names[0].Name
if !ast.IsExported(fieldName) {
continue
}
fieldNameTypeName := getTypeName(field.Type)
if strings.HasSuffix(fieldNameTypeName, "anypb.Any") {
return true
}
}
}
return false
}