468 lines
14 KiB
Go
468 lines
14 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package impl
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import (
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"fmt"
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"reflect"
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pref "google.golang.org/protobuf/reflect/protoreflect"
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)
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// unwrapper unwraps the value to the underlying value.
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// This is implemented by List and Map.
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type unwrapper interface {
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protoUnwrap() interface{}
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}
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// A Converter coverts to/from Go reflect.Value types and protobuf protoreflect.Value types.
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type Converter interface {
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// PBValueOf converts a reflect.Value to a protoreflect.Value.
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PBValueOf(reflect.Value) pref.Value
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// GoValueOf converts a protoreflect.Value to a reflect.Value.
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GoValueOf(pref.Value) reflect.Value
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// IsValidPB returns whether a protoreflect.Value is compatible with this type.
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IsValidPB(pref.Value) bool
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// IsValidGo returns whether a reflect.Value is compatible with this type.
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IsValidGo(reflect.Value) bool
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// New returns a new field value.
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// For scalars, it returns the default value of the field.
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// For composite types, it returns a new mutable value.
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New() pref.Value
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// Zero returns a new field value.
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// For scalars, it returns the default value of the field.
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// For composite types, it returns an immutable, empty value.
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Zero() pref.Value
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}
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// NewConverter matches a Go type with a protobuf field and returns a Converter
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// that converts between the two. Enums must be a named int32 kind that
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// implements protoreflect.Enum, and messages must be pointer to a named
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// struct type that implements protoreflect.ProtoMessage.
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//
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// This matcher deliberately supports a wider range of Go types than what
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// protoc-gen-go historically generated to be able to automatically wrap some
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// v1 messages generated by other forks of protoc-gen-go.
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func NewConverter(t reflect.Type, fd pref.FieldDescriptor) Converter {
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switch {
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case fd.IsList():
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return newListConverter(t, fd)
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case fd.IsMap():
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return newMapConverter(t, fd)
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default:
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return newSingularConverter(t, fd)
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}
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panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
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}
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var (
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boolType = reflect.TypeOf(bool(false))
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int32Type = reflect.TypeOf(int32(0))
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int64Type = reflect.TypeOf(int64(0))
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uint32Type = reflect.TypeOf(uint32(0))
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uint64Type = reflect.TypeOf(uint64(0))
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float32Type = reflect.TypeOf(float32(0))
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float64Type = reflect.TypeOf(float64(0))
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stringType = reflect.TypeOf(string(""))
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bytesType = reflect.TypeOf([]byte(nil))
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byteType = reflect.TypeOf(byte(0))
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)
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var (
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boolZero = pref.ValueOfBool(false)
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int32Zero = pref.ValueOfInt32(0)
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int64Zero = pref.ValueOfInt64(0)
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uint32Zero = pref.ValueOfUint32(0)
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uint64Zero = pref.ValueOfUint64(0)
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float32Zero = pref.ValueOfFloat32(0)
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float64Zero = pref.ValueOfFloat64(0)
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stringZero = pref.ValueOfString("")
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bytesZero = pref.ValueOfBytes(nil)
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)
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func newSingularConverter(t reflect.Type, fd pref.FieldDescriptor) Converter {
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defVal := func(fd pref.FieldDescriptor, zero pref.Value) pref.Value {
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if fd.Cardinality() == pref.Repeated {
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// Default isn't defined for repeated fields.
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return zero
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}
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return fd.Default()
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}
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switch fd.Kind() {
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case pref.BoolKind:
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if t.Kind() == reflect.Bool {
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return &boolConverter{t, defVal(fd, boolZero)}
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}
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case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
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if t.Kind() == reflect.Int32 {
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return &int32Converter{t, defVal(fd, int32Zero)}
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}
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case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
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if t.Kind() == reflect.Int64 {
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return &int64Converter{t, defVal(fd, int64Zero)}
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}
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case pref.Uint32Kind, pref.Fixed32Kind:
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if t.Kind() == reflect.Uint32 {
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return &uint32Converter{t, defVal(fd, uint32Zero)}
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}
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case pref.Uint64Kind, pref.Fixed64Kind:
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if t.Kind() == reflect.Uint64 {
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return &uint64Converter{t, defVal(fd, uint64Zero)}
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}
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case pref.FloatKind:
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if t.Kind() == reflect.Float32 {
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return &float32Converter{t, defVal(fd, float32Zero)}
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}
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case pref.DoubleKind:
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if t.Kind() == reflect.Float64 {
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return &float64Converter{t, defVal(fd, float64Zero)}
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}
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case pref.StringKind:
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if t.Kind() == reflect.String || (t.Kind() == reflect.Slice && t.Elem() == byteType) {
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return &stringConverter{t, defVal(fd, stringZero)}
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}
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case pref.BytesKind:
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if t.Kind() == reflect.String || (t.Kind() == reflect.Slice && t.Elem() == byteType) {
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return &bytesConverter{t, defVal(fd, bytesZero)}
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}
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case pref.EnumKind:
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// Handle enums, which must be a named int32 type.
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if t.Kind() == reflect.Int32 {
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return newEnumConverter(t, fd)
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}
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case pref.MessageKind, pref.GroupKind:
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return newMessageConverter(t)
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}
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panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
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}
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type boolConverter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *boolConverter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfBool(v.Bool())
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}
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func (c *boolConverter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(v.Bool()).Convert(c.goType)
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}
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func (c *boolConverter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(bool)
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return ok
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}
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func (c *boolConverter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *boolConverter) New() pref.Value { return c.def }
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func (c *boolConverter) Zero() pref.Value { return c.def }
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type int32Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *int32Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfInt32(int32(v.Int()))
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}
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func (c *int32Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(int32(v.Int())).Convert(c.goType)
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}
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func (c *int32Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(int32)
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return ok
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}
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func (c *int32Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *int32Converter) New() pref.Value { return c.def }
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func (c *int32Converter) Zero() pref.Value { return c.def }
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type int64Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *int64Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfInt64(int64(v.Int()))
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}
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func (c *int64Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(int64(v.Int())).Convert(c.goType)
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}
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func (c *int64Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(int64)
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return ok
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}
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func (c *int64Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *int64Converter) New() pref.Value { return c.def }
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func (c *int64Converter) Zero() pref.Value { return c.def }
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type uint32Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *uint32Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfUint32(uint32(v.Uint()))
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}
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func (c *uint32Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(uint32(v.Uint())).Convert(c.goType)
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}
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func (c *uint32Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(uint32)
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return ok
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}
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func (c *uint32Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *uint32Converter) New() pref.Value { return c.def }
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func (c *uint32Converter) Zero() pref.Value { return c.def }
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type uint64Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *uint64Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfUint64(uint64(v.Uint()))
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}
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func (c *uint64Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(uint64(v.Uint())).Convert(c.goType)
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}
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func (c *uint64Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(uint64)
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return ok
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}
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func (c *uint64Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *uint64Converter) New() pref.Value { return c.def }
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func (c *uint64Converter) Zero() pref.Value { return c.def }
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type float32Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *float32Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfFloat32(float32(v.Float()))
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}
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func (c *float32Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(float32(v.Float())).Convert(c.goType)
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}
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func (c *float32Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(float32)
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return ok
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}
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func (c *float32Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *float32Converter) New() pref.Value { return c.def }
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func (c *float32Converter) Zero() pref.Value { return c.def }
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type float64Converter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *float64Converter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfFloat64(float64(v.Float()))
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}
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func (c *float64Converter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(float64(v.Float())).Convert(c.goType)
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}
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func (c *float64Converter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(float64)
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return ok
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}
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func (c *float64Converter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *float64Converter) New() pref.Value { return c.def }
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func (c *float64Converter) Zero() pref.Value { return c.def }
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type stringConverter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *stringConverter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfString(v.Convert(stringType).String())
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}
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func (c *stringConverter) GoValueOf(v pref.Value) reflect.Value {
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// pref.Value.String never panics, so we go through an interface
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// conversion here to check the type.
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s := v.Interface().(string)
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if c.goType.Kind() == reflect.Slice && s == "" {
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return reflect.Zero(c.goType) // ensure empty string is []byte(nil)
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}
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return reflect.ValueOf(s).Convert(c.goType)
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}
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func (c *stringConverter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(string)
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return ok
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}
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func (c *stringConverter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *stringConverter) New() pref.Value { return c.def }
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func (c *stringConverter) Zero() pref.Value { return c.def }
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type bytesConverter struct {
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goType reflect.Type
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def pref.Value
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}
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func (c *bytesConverter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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if c.goType.Kind() == reflect.String && v.Len() == 0 {
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return pref.ValueOfBytes(nil) // ensure empty string is []byte(nil)
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}
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return pref.ValueOfBytes(v.Convert(bytesType).Bytes())
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}
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func (c *bytesConverter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(v.Bytes()).Convert(c.goType)
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}
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func (c *bytesConverter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().([]byte)
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return ok
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}
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func (c *bytesConverter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *bytesConverter) New() pref.Value { return c.def }
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func (c *bytesConverter) Zero() pref.Value { return c.def }
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type enumConverter struct {
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goType reflect.Type
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def pref.Value
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}
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func newEnumConverter(goType reflect.Type, fd pref.FieldDescriptor) Converter {
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var def pref.Value
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if fd.Cardinality() == pref.Repeated {
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def = pref.ValueOfEnum(fd.Enum().Values().Get(0).Number())
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} else {
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def = fd.Default()
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}
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return &enumConverter{goType, def}
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}
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func (c *enumConverter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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return pref.ValueOfEnum(pref.EnumNumber(v.Int()))
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}
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func (c *enumConverter) GoValueOf(v pref.Value) reflect.Value {
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return reflect.ValueOf(v.Enum()).Convert(c.goType)
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}
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func (c *enumConverter) IsValidPB(v pref.Value) bool {
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_, ok := v.Interface().(pref.EnumNumber)
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return ok
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}
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func (c *enumConverter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *enumConverter) New() pref.Value {
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return c.def
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}
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func (c *enumConverter) Zero() pref.Value {
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return c.def
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}
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type messageConverter struct {
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goType reflect.Type
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}
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func newMessageConverter(goType reflect.Type) Converter {
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return &messageConverter{goType}
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}
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func (c *messageConverter) PBValueOf(v reflect.Value) pref.Value {
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if v.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
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}
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if m, ok := v.Interface().(pref.ProtoMessage); ok {
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return pref.ValueOfMessage(m.ProtoReflect())
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}
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return pref.ValueOfMessage(legacyWrapMessage(v))
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}
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func (c *messageConverter) GoValueOf(v pref.Value) reflect.Value {
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m := v.Message()
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var rv reflect.Value
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if u, ok := m.(unwrapper); ok {
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rv = reflect.ValueOf(u.protoUnwrap())
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} else {
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rv = reflect.ValueOf(m.Interface())
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}
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if rv.Type() != c.goType {
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panic(fmt.Sprintf("invalid type: got %v, want %v", rv.Type(), c.goType))
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}
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return rv
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}
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func (c *messageConverter) IsValidPB(v pref.Value) bool {
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m := v.Message()
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var rv reflect.Value
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if u, ok := m.(unwrapper); ok {
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rv = reflect.ValueOf(u.protoUnwrap())
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} else {
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rv = reflect.ValueOf(m.Interface())
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}
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return rv.Type() == c.goType
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}
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func (c *messageConverter) IsValidGo(v reflect.Value) bool {
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return v.Type() == c.goType
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}
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func (c *messageConverter) New() pref.Value {
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return c.PBValueOf(reflect.New(c.goType.Elem()))
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}
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func (c *messageConverter) Zero() pref.Value {
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return c.PBValueOf(reflect.Zero(c.goType))
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}
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