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// Copyright (c) 2021 PlanetScale Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package generator
import (
"fmt"
"github.com/planetscale/vtprotobuf/vtproto"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
type GeneratedFile struct {
*protogen.GeneratedFile
Config *Config
LocalPackages map[protoreflect.FullName]bool
}
func (p *GeneratedFile) Ident(path, ident string) string {
return p.QualifiedGoIdent(protogen.GoImportPath(path).Ident(ident))
}
func (b *GeneratedFile) ShouldPool(message *protogen.Message) bool {
// Do not generate pool if message is nil or message excluded by external rules
if message == nil || b.Config.PoolableExclude.Contains(message.GoIdent) {
return false
}
if b.Config.Poolable.Contains(message.GoIdent) {
return true
}
ext := proto.GetExtension(message.Desc.Options(), vtproto.E_Mempool)
if mempool, ok := ext.(bool); ok {
return mempool
}
return false
}
func (b *GeneratedFile) Alloc(vname string, message *protogen.Message, isQualifiedIdent bool) {
ident := message.GoIdent.GoName
if isQualifiedIdent {
ident = b.QualifiedGoIdent(message.GoIdent)
}
if b.ShouldPool(message) {
b.P(vname, " := ", ident, `FromVTPool()`)
} else {
b.P(vname, " := new(", ident, `)`)
}
}
func (p *GeneratedFile) FieldGoType(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 = p.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 = "*" + p.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, _ := p.FieldGoType(field.Message.Fields[0])
valType, _ := p.FieldGoType(field.Message.Fields[1])
return fmt.Sprintf("map[%v]%v", keyType, valType), false
}
return goType, pointer
}
func (p *GeneratedFile) IsLocalMessage(message *protogen.Message) bool {
if message == nil {
return false
}
pkg := message.Desc.ParentFile().Package()
return p.LocalPackages[pkg]
}
func (p *GeneratedFile) IsLocalField(field *protogen.Field) bool {
if field == nil {
return false
}
pkg := field.Desc.ParentFile().Package()
return p.LocalPackages[pkg]
}
const vtHelpersPackage = protogen.GoImportPath("github.com/planetscale/vtprotobuf/protohelpers")
var helpers = map[string]protogen.GoIdent{
"EncodeVarint": {GoName: "EncodeVarint", GoImportPath: vtHelpersPackage},
"SizeOfVarint": {GoName: "SizeOfVarint", GoImportPath: vtHelpersPackage},
"SizeOfZigzag": {GoName: "SizeOfZigzag", GoImportPath: vtHelpersPackage},
"Skip": {GoName: "Skip", GoImportPath: vtHelpersPackage},
"ErrInvalidLength": {GoName: "ErrInvalidLength", GoImportPath: vtHelpersPackage},
"ErrIntOverflow": {GoName: "ErrIntOverflow", GoImportPath: vtHelpersPackage},
"ErrUnexpectedEndOfGroup": {GoName: "ErrUnexpectedEndOfGroup", GoImportPath: vtHelpersPackage},
}
func (p *GeneratedFile) Helper(name string) protogen.GoIdent {
return helpers[name]
}
const vtWellKnownPackage = protogen.GoImportPath("github.com/planetscale/vtprotobuf/types/known/")
var wellKnownTypes = map[protoreflect.FullName]protogen.GoIdent{
"google.protobuf.Any": {GoName: "Any", GoImportPath: vtWellKnownPackage + "anypb"},
"google.protobuf.Duration": {GoName: "Duration", GoImportPath: vtWellKnownPackage + "durationpb"},
"google.protobuf.Empty": {GoName: "Empty", GoImportPath: vtWellKnownPackage + "emptypb"},
"google.protobuf.FieldMask": {GoName: "FieldMask", GoImportPath: vtWellKnownPackage + "fieldmaskpb"},
"google.protobuf.Timestamp": {GoName: "Timestamp", GoImportPath: vtWellKnownPackage + "timestamppb"},
"google.protobuf.DoubleValue": {GoName: "DoubleValue", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.FloatValue": {GoName: "FloatValue", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.Int64Value": {GoName: "Int64Value", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.UInt64Value": {GoName: "UInt64Value", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.Int32Value": {GoName: "Int32Value", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.UInt32Value": {GoName: "UInt32Value", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.BoolValue": {GoName: "BoolValue", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.StringValue": {GoName: "StringValue", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.BytesValue": {GoName: "BytesValue", GoImportPath: vtWellKnownPackage + "wrapperspb"},
"google.protobuf.Struct": {GoName: "Struct", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value": {GoName: "Value", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.ListValue": {GoName: "ListValue", GoImportPath: vtWellKnownPackage + "structpb"},
}
var wellKnownFields = map[protoreflect.FullName]protogen.GoIdent{
"google.protobuf.Value.null_value": {GoName: "Value_NullValue", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value.number_value": {GoName: "Value_NumberValue", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value.string_value": {GoName: "Value_StringValue", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value.bool_value": {GoName: "Value_BoolValue", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value.struct_value": {GoName: "Value_StructValue", GoImportPath: vtWellKnownPackage + "structpb"},
"google.protobuf.Value.list_value": {GoName: "Value_ListValue", GoImportPath: vtWellKnownPackage + "structpb"},
}
func (p *GeneratedFile) IsWellKnownType(message *protogen.Message) bool {
if message == nil {
return false
}
_, ok := wellKnownTypes[message.Desc.FullName()]
return ok
}
func (p *GeneratedFile) WellKnownFieldMap(field *protogen.Field) protogen.GoIdent {
if field == nil {
return protogen.GoIdent{}
}
res, ff := wellKnownFields[field.Desc.FullName()]
if !ff {
panic(field.Desc.FullName())
}
if p.IsLocalField(field) {
res.GoImportPath = ""
}
return res
}
func (p *GeneratedFile) WellKnownTypeMap(message *protogen.Message) protogen.GoIdent {
if message == nil {
return protogen.GoIdent{}
}
res := wellKnownTypes[message.Desc.FullName()]
if p.IsLocalMessage(message) {
res.GoImportPath = ""
}
return res
}
func (p *GeneratedFile) Wrapper() bool {
return p.Config.Wrap
}
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