blob: d34efa9b1cf162bb937c2db702af737d81bc6877 [file] [log] [blame]
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package internal_gengo is internal to the protobuf module.
package internal_gengo
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"math"
"strconv"
"strings"
"unicode"
"unicode/utf8"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/internal/encoding/tag"
"google.golang.org/protobuf/internal/genid"
"google.golang.org/protobuf/internal/version"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/runtime/protoimpl"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/pluginpb"
)
// SupportedFeatures reports the set of supported protobuf language features.
var SupportedFeatures = uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)
// GenerateVersionMarkers specifies whether to generate version markers.
var GenerateVersionMarkers = true
// Standard library dependencies.
const (
base64Package = protogen.GoImportPath("encoding/base64")
mathPackage = protogen.GoImportPath("math")
reflectPackage = protogen.GoImportPath("reflect")
sortPackage = protogen.GoImportPath("sort")
stringsPackage = protogen.GoImportPath("strings")
syncPackage = protogen.GoImportPath("sync")
timePackage = protogen.GoImportPath("time")
utf8Package = protogen.GoImportPath("unicode/utf8")
)
// Protobuf library dependencies.
//
// These are declared as an interface type so that they can be more easily
// patched to support unique build environments that impose restrictions
// on the dependencies of generated source code.
var (
protoPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/proto")
protoifacePackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/runtime/protoiface")
protoimplPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/runtime/protoimpl")
protojsonPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/encoding/protojson")
protoreflectPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/reflect/protoreflect")
protoregistryPackage goImportPath = protogen.GoImportPath("google.golang.org/protobuf/reflect/protoregistry")
)
type goImportPath interface {
String() string
Ident(string) protogen.GoIdent
}
// GenerateFile generates the contents of a .pb.go file.
func GenerateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile {
filename := file.GeneratedFilenamePrefix + ".pb.go"
g := gen.NewGeneratedFile(filename, file.GoImportPath)
f := newFileInfo(file)
genStandaloneComments(g, f, int32(genid.FileDescriptorProto_Syntax_field_number))
genGeneratedHeader(gen, g, f)
genStandaloneComments(g, f, int32(genid.FileDescriptorProto_Package_field_number))
packageDoc := genPackageKnownComment(f)
g.P(packageDoc, "package ", f.GoPackageName)
g.P()
// Emit a static check that enforces a minimum version of the proto package.
if GenerateVersionMarkers {
g.P("const (")
g.P("// Verify that this generated code is sufficiently up-to-date.")
g.P("_ = ", protoimplPackage.Ident("EnforceVersion"), "(", protoimpl.GenVersion, " - ", protoimplPackage.Ident("MinVersion"), ")")
g.P("// Verify that runtime/protoimpl is sufficiently up-to-date.")
g.P("_ = ", protoimplPackage.Ident("EnforceVersion"), "(", protoimplPackage.Ident("MaxVersion"), " - ", protoimpl.GenVersion, ")")
g.P(")")
g.P()
}
for i, imps := 0, f.Desc.Imports(); i < imps.Len(); i++ {
genImport(gen, g, f, imps.Get(i))
}
for _, enum := range f.allEnums {
genEnum(g, f, enum)
}
for _, message := range f.allMessages {
genMessage(g, f, message)
}
genExtensions(g, f)
genReflectFileDescriptor(gen, g, f)
return g
}
// genStandaloneComments prints all leading comments for a FileDescriptorProto
// location identified by the field number n.
func genStandaloneComments(g *protogen.GeneratedFile, f *fileInfo, n int32) {
loc := f.Desc.SourceLocations().ByPath(protoreflect.SourcePath{n})
for _, s := range loc.LeadingDetachedComments {
g.P(protogen.Comments(s))
g.P()
}
if s := loc.LeadingComments; s != "" {
g.P(protogen.Comments(s))
g.P()
}
}
func genGeneratedHeader(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo) {
g.P("// Code generated by protoc-gen-go. DO NOT EDIT.")
if GenerateVersionMarkers {
g.P("// versions:")
protocGenGoVersion := version.String()
protocVersion := "(unknown)"
if v := gen.Request.GetCompilerVersion(); v != nil {
protocVersion = fmt.Sprintf("v%v.%v.%v", v.GetMajor(), v.GetMinor(), v.GetPatch())
if s := v.GetSuffix(); s != "" {
protocVersion += "-" + s
}
}
g.P("// \tprotoc-gen-go ", protocGenGoVersion)
g.P("// \tprotoc ", protocVersion)
}
if f.Proto.GetOptions().GetDeprecated() {
g.P("// ", f.Desc.Path(), " is a deprecated file.")
} else {
g.P("// source: ", f.Desc.Path())
}
g.P()
}
func genImport(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, imp protoreflect.FileImport) {
impFile, ok := gen.FilesByPath[imp.Path()]
if !ok {
return
}
if impFile.GoImportPath == f.GoImportPath {
// Don't generate imports or aliases for types in the same Go package.
return
}
// Generate imports for all non-weak dependencies, even if they are not
// referenced, because other code and tools depend on having the
// full transitive closure of protocol buffer types in the binary.
if !imp.IsWeak {
g.Import(impFile.GoImportPath)
}
if !imp.IsPublic {
return
}
// Generate public imports by generating the imported file, parsing it,
// and extracting every symbol that should receive a forwarding declaration.
impGen := GenerateFile(gen, impFile)
impGen.Skip()
b, err := impGen.Content()
if err != nil {
gen.Error(err)
return
}
fset := token.NewFileSet()
astFile, err := parser.ParseFile(fset, "", b, parser.ParseComments)
if err != nil {
gen.Error(err)
return
}
genForward := func(tok token.Token, name string, expr ast.Expr) {
// Don't import unexported symbols.
r, _ := utf8.DecodeRuneInString(name)
if !unicode.IsUpper(r) {
return
}
// Don't import the FileDescriptor.
if name == impFile.GoDescriptorIdent.GoName {
return
}
// Don't import decls referencing a symbol defined in another package.
// i.e., don't import decls which are themselves public imports:
//
// type T = somepackage.T
if _, ok := expr.(*ast.SelectorExpr); ok {
return
}
g.P(tok, " ", name, " = ", impFile.GoImportPath.Ident(name))
}
g.P("// Symbols defined in public import of ", imp.Path(), ".")
g.P()
for _, decl := range astFile.Decls {
switch decl := decl.(type) {
case *ast.GenDecl:
for _, spec := range decl.Specs {
switch spec := spec.(type) {
case *ast.TypeSpec:
genForward(decl.Tok, spec.Name.Name, spec.Type)
case *ast.ValueSpec:
for i, name := range spec.Names {
var expr ast.Expr
if i < len(spec.Values) {
expr = spec.Values[i]
}
genForward(decl.Tok, name.Name, expr)
}
case *ast.ImportSpec:
default:
panic(fmt.Sprintf("can't generate forward for spec type %T", spec))
}
}
}
}
g.P()
}
func genEnum(g *protogen.GeneratedFile, f *fileInfo, e *enumInfo) {
// Enum type declaration.
g.Annotate(e.GoIdent.GoName, e.Location)
leadingComments := appendDeprecationSuffix(e.Comments.Leading,
e.Desc.Options().(*descriptorpb.EnumOptions).GetDeprecated())
g.P(leadingComments,
"type ", e.GoIdent, " int32")
// Enum value constants.
g.P("const (")
for _, value := range e.Values {
g.Annotate(value.GoIdent.GoName, value.Location)
leadingComments := appendDeprecationSuffix(value.Comments.Leading,
value.Desc.Options().(*descriptorpb.EnumValueOptions).GetDeprecated())
g.P(leadingComments,
value.GoIdent, " ", e.GoIdent, " = ", value.Desc.Number(),
trailingComment(value.Comments.Trailing))
}
g.P(")")
g.P()
// Enum value maps.
g.P("// Enum value maps for ", e.GoIdent, ".")
g.P("var (")
g.P(e.GoIdent.GoName+"_name", " = map[int32]string{")
for _, value := range e.Values {
duplicate := ""
if value.Desc != e.Desc.Values().ByNumber(value.Desc.Number()) {
duplicate = "// Duplicate value: "
}
g.P(duplicate, value.Desc.Number(), ": ", strconv.Quote(string(value.Desc.Name())), ",")
}
g.P("}")
g.P(e.GoIdent.GoName+"_value", " = map[string]int32{")
for _, value := range e.Values {
g.P(strconv.Quote(string(value.Desc.Name())), ": ", value.Desc.Number(), ",")
}
g.P("}")
g.P(")")
g.P()
// Enum method.
//
// NOTE: A pointer value is needed to represent presence in proto2.
// Since a proto2 message can reference a proto3 enum, it is useful to
// always generate this method (even on proto3 enums) to support that case.
g.P("func (x ", e.GoIdent, ") Enum() *", e.GoIdent, " {")
g.P("p := new(", e.GoIdent, ")")
g.P("*p = x")
g.P("return p")
g.P("}")
g.P()
// String method.
g.P("func (x ", e.GoIdent, ") String() string {")
g.P("return ", protoimplPackage.Ident("X"), ".EnumStringOf(x.Descriptor(), ", protoreflectPackage.Ident("EnumNumber"), "(x))")
g.P("}")
g.P()
genEnumReflectMethods(g, f, e)
// UnmarshalJSON method.
if e.genJSONMethod && e.Desc.Syntax() == protoreflect.Proto2 {
g.P("// Deprecated: Do not use.")
g.P("func (x *", e.GoIdent, ") UnmarshalJSON(b []byte) error {")
g.P("num, err := ", protoimplPackage.Ident("X"), ".UnmarshalJSONEnum(x.Descriptor(), b)")
g.P("if err != nil {")
g.P("return err")
g.P("}")
g.P("*x = ", e.GoIdent, "(num)")
g.P("return nil")
g.P("}")
g.P()
}
// EnumDescriptor method.
if e.genRawDescMethod {
var indexes []string
for i := 1; i < len(e.Location.Path); i += 2 {
indexes = append(indexes, strconv.Itoa(int(e.Location.Path[i])))
}
g.P("// Deprecated: Use ", e.GoIdent, ".Descriptor instead.")
g.P("func (", e.GoIdent, ") EnumDescriptor() ([]byte, []int) {")
g.P("return ", rawDescVarName(f), "GZIP(), []int{", strings.Join(indexes, ","), "}")
g.P("}")
g.P()
f.needRawDesc = true
}
}
func genMessage(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
if m.Desc.IsMapEntry() {
return
}
// Message type declaration.
g.Annotate(m.GoIdent.GoName, m.Location)
leadingComments := appendDeprecationSuffix(m.Comments.Leading,
m.Desc.Options().(*descriptorpb.MessageOptions).GetDeprecated())
g.P(leadingComments,
"type ", m.GoIdent, " struct {")
genMessageFields(g, f, m)
g.P("}")
g.P()
genMessageKnownFunctions(g, f, m)
genMessageDefaultDecls(g, f, m)
genMessageMethods(g, f, m)
genMessageOneofWrapperTypes(g, f, m)
}
func genMessageFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
sf := f.allMessageFieldsByPtr[m]
genMessageInternalFields(g, f, m, sf)
for _, field := range m.Fields {
genMessageField(g, f, m, field, sf)
}
}
func genMessageInternalFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, sf *structFields) {
g.P(genid.State_goname, " ", protoimplPackage.Ident("MessageState"))
sf.append(genid.State_goname)
g.P(genid.SizeCache_goname, " ", protoimplPackage.Ident("SizeCache"))
sf.append(genid.SizeCache_goname)
if m.hasWeak {
g.P(genid.WeakFields_goname, " ", protoimplPackage.Ident("WeakFields"))
sf.append(genid.WeakFields_goname)
}
g.P(genid.UnknownFields_goname, " ", protoimplPackage.Ident("UnknownFields"))
sf.append(genid.UnknownFields_goname)
if m.Desc.ExtensionRanges().Len() > 0 {
g.P(genid.ExtensionFields_goname, " ", protoimplPackage.Ident("ExtensionFields"))
sf.append(genid.ExtensionFields_goname)
}
if sf.count > 0 {
g.P()
}
}
func genMessageField(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field, sf *structFields) {
if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() {
// It would be a bit simpler to iterate over the oneofs below,
// but generating the field here keeps the contents of the Go
// struct in the same order as the contents of the source
// .proto file.
if oneof.Fields[0] != field {
return // only generate for first appearance
}
tags := structTags{
{"protobuf_oneof", string(oneof.Desc.Name())},
}
if m.isTracked {
tags = append(tags, gotrackTags...)
}
g.Annotate(m.GoIdent.GoName+"."+oneof.GoName, oneof.Location)
leadingComments := oneof.Comments.Leading
if leadingComments != "" {
leadingComments += "\n"
}
ss := []string{fmt.Sprintf(" Types that are assignable to %s:\n", oneof.GoName)}
for _, field := range oneof.Fields {
ss = append(ss, "\t*"+field.GoIdent.GoName+"\n")
}
leadingComments += protogen.Comments(strings.Join(ss, ""))
g.P(leadingComments,
oneof.GoName, " ", oneofInterfaceName(oneof), tags)
sf.append(oneof.GoName)
return
}
goType, pointer := fieldGoType(g, f, field)
if pointer {
goType = "*" + goType
}
tags := structTags{
{"protobuf", fieldProtobufTagValue(field)},
{"json", fieldJSONTagValue(field)},
}
if field.Desc.IsMap() {
key := field.Message.Fields[0]
val := field.Message.Fields[1]
tags = append(tags, structTags{
{"protobuf_key", fieldProtobufTagValue(key)},
{"protobuf_val", fieldProtobufTagValue(val)},
}...)
}
if m.isTracked {
tags = append(tags, gotrackTags...)
}
name := field.GoName
if field.Desc.IsWeak() {
name = genid.WeakFieldPrefix_goname + name
}
g.Annotate(m.GoIdent.GoName+"."+name, field.Location)
leadingComments := appendDeprecationSuffix(field.Comments.Leading,
field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
g.P(leadingComments,
name, " ", goType, tags,
trailingComment(field.Comments.Trailing))
sf.append(field.GoName)
}
// genMessageDefaultDecls generates consts and vars holding the default
// values of fields.
func genMessageDefaultDecls(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
var consts, vars []string
for _, field := range m.Fields {
if !field.Desc.HasDefault() {
continue
}
name := "Default_" + m.GoIdent.GoName + "_" + field.GoName
goType, _ := fieldGoType(g, f, field)
defVal := field.Desc.Default()
switch field.Desc.Kind() {
case protoreflect.StringKind:
consts = append(consts, fmt.Sprintf("%s = %s(%q)", name, goType, defVal.String()))
case protoreflect.BytesKind:
vars = append(vars, fmt.Sprintf("%s = %s(%q)", name, goType, defVal.Bytes()))
case protoreflect.EnumKind:
idx := field.Desc.DefaultEnumValue().Index()
val := field.Enum.Values[idx]
if val.GoIdent.GoImportPath == f.GoImportPath {
consts = append(consts, fmt.Sprintf("%s = %s", name, g.QualifiedGoIdent(val.GoIdent)))
} else {
// If the enum value is declared in a different Go package,
// reference it by number since the name may not be correct.
// See https://github.com/golang/protobuf/issues/513.
consts = append(consts, fmt.Sprintf("%s = %s(%d) // %s",
name, g.QualifiedGoIdent(field.Enum.GoIdent), val.Desc.Number(), g.QualifiedGoIdent(val.GoIdent)))
}
case protoreflect.FloatKind, protoreflect.DoubleKind:
if f := defVal.Float(); math.IsNaN(f) || math.IsInf(f, 0) {
var fn, arg string
switch f := defVal.Float(); {
case math.IsInf(f, -1):
fn, arg = g.QualifiedGoIdent(mathPackage.Ident("Inf")), "-1"
case math.IsInf(f, +1):
fn, arg = g.QualifiedGoIdent(mathPackage.Ident("Inf")), "+1"
case math.IsNaN(f):
fn, arg = g.QualifiedGoIdent(mathPackage.Ident("NaN")), ""
}
vars = append(vars, fmt.Sprintf("%s = %s(%s(%s))", name, goType, fn, arg))
} else {
consts = append(consts, fmt.Sprintf("%s = %s(%v)", name, goType, f))
}
default:
consts = append(consts, fmt.Sprintf("%s = %s(%v)", name, goType, defVal.Interface()))
}
}
if len(consts) > 0 {
g.P("// Default values for ", m.GoIdent, " fields.")
g.P("const (")
for _, s := range consts {
g.P(s)
}
g.P(")")
}
if len(vars) > 0 {
g.P("// Default values for ", m.GoIdent, " fields.")
g.P("var (")
for _, s := range vars {
g.P(s)
}
g.P(")")
}
g.P()
}
func genMessageMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
genMessageBaseMethods(g, f, m)
genMessageGetterMethods(g, f, m)
genMessageSetterMethods(g, f, m)
}
func genMessageBaseMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
// Reset method.
g.P("func (x *", m.GoIdent, ") Reset() {")
g.P("*x = ", m.GoIdent, "{}")
g.P("if ", protoimplPackage.Ident("UnsafeEnabled"), " {")
g.P("mi := &", messageTypesVarName(f), "[", f.allMessagesByPtr[m], "]")
g.P("ms := ", protoimplPackage.Ident("X"), ".MessageStateOf(", protoimplPackage.Ident("Pointer"), "(x))")
g.P("ms.StoreMessageInfo(mi)")
g.P("}")
g.P("}")
g.P()
// String method.
g.P("func (x *", m.GoIdent, ") String() string {")
g.P("return ", protoimplPackage.Ident("X"), ".MessageStringOf(x)")
g.P("}")
g.P()
// ProtoMessage method.
g.P("func (*", m.GoIdent, ") ProtoMessage() {}")
g.P()
// ProtoReflect method.
genMessageReflectMethods(g, f, m)
// Descriptor method.
if m.genRawDescMethod {
var indexes []string
for i := 1; i < len(m.Location.Path); i += 2 {
indexes = append(indexes, strconv.Itoa(int(m.Location.Path[i])))
}
g.P("// Deprecated: Use ", m.GoIdent, ".ProtoReflect.Descriptor instead.")
g.P("func (*", m.GoIdent, ") Descriptor() ([]byte, []int) {")
g.P("return ", rawDescVarName(f), "GZIP(), []int{", strings.Join(indexes, ","), "}")
g.P("}")
g.P()
f.needRawDesc = true
}
}
func genMessageGetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
for _, field := range m.Fields {
genNoInterfacePragma(g, m.isTracked)
// Getter for parent oneof.
if oneof := field.Oneof; oneof != nil && oneof.Fields[0] == field && !oneof.Desc.IsSynthetic() {
g.Annotate(m.GoIdent.GoName+".Get"+oneof.GoName, oneof.Location)
g.P("func (m *", m.GoIdent.GoName, ") Get", oneof.GoName, "() ", oneofInterfaceName(oneof), " {")
g.P("if m != nil {")
g.P("return m.", oneof.GoName)
g.P("}")
g.P("return nil")
g.P("}")
g.P()
}
// Getter for message field.
goType, pointer := fieldGoType(g, f, field)
defaultValue := fieldDefaultValue(g, f, m, field)
g.Annotate(m.GoIdent.GoName+".Get"+field.GoName, field.Location)
leadingComments := appendDeprecationSuffix("",
field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
switch {
case field.Desc.IsWeak():
g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", protoPackage.Ident("Message"), "{")
g.P("var w ", protoimplPackage.Ident("WeakFields"))
g.P("if x != nil {")
g.P("w = x.", genid.WeakFields_goname)
if m.isTracked {
g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
}
g.P("}")
g.P("return ", protoimplPackage.Ident("X"), ".GetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ")")
g.P("}")
case field.Oneof != nil && !field.Oneof.Desc.IsSynthetic():
g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
g.P("if x, ok := x.Get", field.Oneof.GoName, "().(*", field.GoIdent, "); ok {")
g.P("return x.", field.GoName)
g.P("}")
g.P("return ", defaultValue)
g.P("}")
default:
g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
if !field.Desc.HasPresence() || defaultValue == "nil" {
g.P("if x != nil {")
} else {
g.P("if x != nil && x.", field.GoName, " != nil {")
}
star := ""
if pointer {
star = "*"
}
g.P("return ", star, " x.", field.GoName)
g.P("}")
g.P("return ", defaultValue)
g.P("}")
}
g.P()
}
}
func genMessageSetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
for _, field := range m.Fields {
if !field.Desc.IsWeak() {
continue
}
genNoInterfacePragma(g, m.isTracked)
g.Annotate(m.GoIdent.GoName+".Set"+field.GoName, field.Location)
leadingComments := appendDeprecationSuffix("",
field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
g.P(leadingComments, "func (x *", m.GoIdent, ") Set", field.GoName, "(v ", protoPackage.Ident("Message"), ") {")
g.P("var w *", protoimplPackage.Ident("WeakFields"))
g.P("if x != nil {")
g.P("w = &x.", genid.WeakFields_goname)
if m.isTracked {
g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
}
g.P("}")
g.P(protoimplPackage.Ident("X"), ".SetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ", v)")
g.P("}")
g.P()
}
}
// fieldGoType returns the Go type used for a field.
//
// If it returns pointer=true, the struct field is a pointer to the type.
func fieldGoType(g *protogen.GeneratedFile, f *fileInfo, field *protogen.Field) (goType string, pointer bool) {
if field.Desc.IsWeak() {
return "struct{}", false
}
pointer = field.Desc.HasPresence()
switch field.Desc.Kind() {
case protoreflect.BoolKind:
goType = "bool"
case protoreflect.EnumKind:
goType = g.QualifiedGoIdent(field.Enum.GoIdent)
case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
goType = "int32"
case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
goType = "uint32"
case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
goType = "int64"
case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
goType = "uint64"
case protoreflect.FloatKind:
goType = "float32"
case protoreflect.DoubleKind:
goType = "float64"
case protoreflect.StringKind:
goType = "string"
case protoreflect.BytesKind:
goType = "[]byte"
pointer = false // rely on nullability of slices for presence
case protoreflect.MessageKind, protoreflect.GroupKind:
goType = "*" + g.QualifiedGoIdent(field.Message.GoIdent)
pointer = false // pointer captured as part of the type
}
switch {
case field.Desc.IsList():
return "[]" + goType, false
case field.Desc.IsMap():
keyType, _ := fieldGoType(g, f, field.Message.Fields[0])
valType, _ := fieldGoType(g, f, field.Message.Fields[1])
return fmt.Sprintf("map[%v]%v", keyType, valType), false
}
return goType, pointer
}
func fieldProtobufTagValue(field *protogen.Field) string {
var enumName string
if field.Desc.Kind() == protoreflect.EnumKind {
enumName = protoimpl.X.LegacyEnumName(field.Enum.Desc)
}
return tag.Marshal(field.Desc, enumName)
}
func fieldDefaultValue(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field) string {
if field.Desc.IsList() {
return "nil"
}
if field.Desc.HasDefault() {
defVarName := "Default_" + m.GoIdent.GoName + "_" + field.GoName
if field.Desc.Kind() == protoreflect.BytesKind {
return "append([]byte(nil), " + defVarName + "...)"
}
return defVarName
}
switch field.Desc.Kind() {
case protoreflect.BoolKind:
return "false"
case protoreflect.StringKind:
return `""`
case protoreflect.MessageKind, protoreflect.GroupKind, protoreflect.BytesKind:
return "nil"
case protoreflect.EnumKind:
val := field.Enum.Values[0]
if val.GoIdent.GoImportPath == f.GoImportPath {
return g.QualifiedGoIdent(val.GoIdent)
} else {
// If the enum value is declared in a different Go package,
// reference it by number since the name may not be correct.
// See https://github.com/golang/protobuf/issues/513.
return g.QualifiedGoIdent(field.Enum.GoIdent) + "(" + strconv.FormatInt(int64(val.Desc.Number()), 10) + ")"
}
default:
return "0"
}
}
func fieldJSONTagValue(field *protogen.Field) string {
return string(field.Desc.Name()) + ",omitempty"
}
func genExtensions(g *protogen.GeneratedFile, f *fileInfo) {
if len(f.allExtensions) == 0 {
return
}
g.P("var ", extensionTypesVarName(f), " = []", protoimplPackage.Ident("ExtensionInfo"), "{")
for _, x := range f.allExtensions {
g.P("{")
g.P("ExtendedType: (*", x.Extendee.GoIdent, ")(nil),")
goType, pointer := fieldGoType(g, f, x.Extension)
if pointer {
goType = "*" + goType
}
g.P("ExtensionType: (", goType, ")(nil),")
g.P("Field: ", x.Desc.Number(), ",")
g.P("Name: ", strconv.Quote(string(x.Desc.FullName())), ",")
g.P("Tag: ", strconv.Quote(fieldProtobufTagValue(x.Extension)), ",")
g.P("Filename: ", strconv.Quote(f.Desc.Path()), ",")
g.P("},")
}
g.P("}")
g.P()
// Group extensions by the target message.
var orderedTargets []protogen.GoIdent
allExtensionsByTarget := make(map[protogen.GoIdent][]*extensionInfo)
allExtensionsByPtr := make(map[*extensionInfo]int)
for i, x := range f.allExtensions {
target := x.Extendee.GoIdent
if len(allExtensionsByTarget[target]) == 0 {
orderedTargets = append(orderedTargets, target)
}
allExtensionsByTarget[target] = append(allExtensionsByTarget[target], x)
allExtensionsByPtr[x] = i
}
for _, target := range orderedTargets {
g.P("// Extension fields to ", target, ".")
g.P("var (")
for _, x := range allExtensionsByTarget[target] {
xd := x.Desc
typeName := xd.Kind().String()
switch xd.Kind() {
case protoreflect.EnumKind:
typeName = string(xd.Enum().FullName())
case protoreflect.MessageKind, protoreflect.GroupKind:
typeName = string(xd.Message().FullName())
}
fieldName := string(xd.Name())
leadingComments := x.Comments.Leading
if leadingComments != "" {
leadingComments += "\n"
}
leadingComments += protogen.Comments(fmt.Sprintf(" %v %v %v = %v;\n",
xd.Cardinality(), typeName, fieldName, xd.Number()))
leadingComments = appendDeprecationSuffix(leadingComments,
x.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
g.P(leadingComments,
"E_", x.GoIdent, " = &", extensionTypesVarName(f), "[", allExtensionsByPtr[x], "]",
trailingComment(x.Comments.Trailing))
}
g.P(")")
g.P()
}
}
// genMessageOneofWrapperTypes generates the oneof wrapper types and
// associates the types with the parent message type.
func genMessageOneofWrapperTypes(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
for _, oneof := range m.Oneofs {
if oneof.Desc.IsSynthetic() {
continue
}
ifName := oneofInterfaceName(oneof)
g.P("type ", ifName, " interface {")
g.P(ifName, "()")
g.P("}")
g.P()
for _, field := range oneof.Fields {
g.Annotate(field.GoIdent.GoName, field.Location)
g.Annotate(field.GoIdent.GoName+"."+field.GoName, field.Location)
g.P("type ", field.GoIdent, " struct {")
goType, _ := fieldGoType(g, f, field)
tags := structTags{
{"protobuf", fieldProtobufTagValue(field)},
}
if m.isTracked {
tags = append(tags, gotrackTags...)
}
leadingComments := appendDeprecationSuffix(field.Comments.Leading,
field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
g.P(leadingComments,
field.GoName, " ", goType, tags,
trailingComment(field.Comments.Trailing))
g.P("}")
g.P()
}
for _, field := range oneof.Fields {
g.P("func (*", field.GoIdent, ") ", ifName, "() {}")
g.P()
}
}
}
// oneofInterfaceName returns the name of the interface type implemented by
// the oneof field value types.
func oneofInterfaceName(oneof *protogen.Oneof) string {
return "is" + oneof.GoIdent.GoName
}
// genNoInterfacePragma generates a standalone "nointerface" pragma to
// decorate methods with field-tracking support.
func genNoInterfacePragma(g *protogen.GeneratedFile, tracked bool) {
if tracked {
g.P("//go:nointerface")
g.P()
}
}
var gotrackTags = structTags{{"go", "track"}}
// structTags is a data structure for build idiomatic Go struct tags.
// Each [2]string is a key-value pair, where value is the unescaped string.
//
// Example: structTags{{"key", "value"}}.String() -> `key:"value"`
type structTags [][2]string
func (tags structTags) String() string {
if len(tags) == 0 {
return ""
}
var ss []string
for _, tag := range tags {
// NOTE: When quoting the value, we need to make sure the backtick
// character does not appear. Convert all cases to the escaped hex form.
key := tag[0]
val := strings.Replace(strconv.Quote(tag[1]), "`", `\x60`, -1)
ss = append(ss, fmt.Sprintf("%s:%s", key, val))
}
return "`" + strings.Join(ss, " ") + "`"
}
// appendDeprecationSuffix optionally appends a deprecation notice as a suffix.
func appendDeprecationSuffix(prefix protogen.Comments, deprecated bool) protogen.Comments {
if !deprecated {
return prefix
}
if prefix != "" {
prefix += "\n"
}
return prefix + " Deprecated: Do not use.\n"
}
// trailingComment is like protogen.Comments, but lacks a trailing newline.
type trailingComment protogen.Comments
func (c trailingComment) String() string {
s := strings.TrimSuffix(protogen.Comments(c).String(), "\n")
if strings.Contains(s, "\n") {
// We don't support multi-lined trailing comments as it is unclear
// how to best render them in the generated code.
return ""
}
return s
}