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wkt_any.go
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wkt_any.go
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package jsoniterpb
import (
"fmt"
"io"
"unsafe"
jsoniter "github.com/json-iterator/go"
"github.com/modern-go/reflect2"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/known/anypb"
)
var (
Any_message_fullname protoreflect.FullName = "google.protobuf.Any"
)
type wktAnyEncoder struct {
ext *ProtoExtension
}
func (c *wktAnyEncoder) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
m := ((*anypb.Any)(ptr))
if m.GetTypeUrl() == "" {
if len(m.GetValue()) <= 0 {
stream.WriteEmptyObject()
return
}
stream.Error = fmt.Errorf(`%s: "type_url" is not set, but "value" is set.`, Any_message_fullname)
return
}
resolver := c.ext.GetResolver()
// Resolve the type in order to unmarshal value field.
emt, err := resolver.FindMessageByURL(m.GetTypeUrl())
if err != nil {
stream.Error = fmt.Errorf("%s: unable to resolve %q: %v", Any_message_fullname, m.GetTypeUrl(), err)
return
}
em := emt.New().Interface()
err = proto.UnmarshalOptions{
AllowPartial: true, // never check required fields inside an Any
Resolver: resolver,
}.Unmarshal(m.GetValue(), em)
if err != nil {
stream.Error = fmt.Errorf("%s: unable to unmarshal %q: %v", Any_message_fullname, m.GetTypeUrl(), err)
return
}
// If type of value has custom JSON encoding, marshal out a field "value"
// with corresponding custom JSON encoding of the embedded message as a
// field.
if IsWellKnownType(reflect2.TypeOf(em)) {
stream.WriteObjectStart()
stream.WriteObjectField("@type")
stream.WriteVal(m.GetTypeUrl())
stream.WriteMore()
stream.WriteObjectField("value")
stream.WriteVal(em)
stream.WriteObjectEnd()
return
}
// Else, marshal out the embedded message's fields in this Any object.
subStream := stream.API().BorrowStream(nil)
subStream.Attachment = stream.Attachment
defer stream.API().ReturnStream(subStream)
subStream.WriteVal(em)
if subStream.Error != nil && subStream.Error != io.EOF {
stream.Error = fmt.Errorf("%s: unable to marshal %q: %v", Any_message_fullname, m.GetTypeUrl(), subStream.Error)
return
}
subIter := stream.API().BorrowIterator(subStream.Buffer())
defer stream.API().ReturnIterator(subIter)
stream.WriteObjectStart()
stream.WriteObjectField("@type")
stream.WriteVal(m.GetTypeUrl())
subIter.ReadObjectCB(func(iter *jsoniter.Iterator, field string) bool {
stream.WriteMore()
stream.WriteObjectField(field)
stream.Write(iter.SkipAndReturnBytes())
return true
})
stream.WriteObjectEnd()
}
func (c *wktAnyEncoder) IsEmpty(ptr unsafe.Pointer) bool {
return false // this is for elem type , so does not need this
}
type wktAnyDecoder struct {
ext *ProtoExtension
}
func (c *wktAnyDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
m := ((*anypb.Any)(ptr))
var typeUrl string
var valueBytes []byte
fields := map[string]bool{}
subStream := iter.API().BorrowStream(nil)
defer iter.API().ReturnStream(subStream)
subStream.WriteObjectStart()
iter.ReadMapCB(func(iter *jsoniter.Iterator, field string) bool {
if fields[field] {
iter.ReportError("protobuf", fmt.Sprintf("%s: duplicate %q field", Any_message_fullname, field))
return false
}
fields[field] = true
if field == "@type" {
typeUrl = iter.ReadString()
return true
}
value := iter.SkipAndReturnBytes()
if field == "value" {
valueBytes = value
}
subStream.WriteObjectField(field)
subStream.Write(value)
return true
})
subStream.WriteObjectEnd()
if len(fields) <= 0 {
// empty any object
m.TypeUrl = typeUrl
m.Value = nil
return
}
if typeUrl == "" {
if fields["@type"] {
iter.ReportError("protobuf", fmt.Sprintf(`%s: "@type" field contains empty value`, Any_message_fullname))
return
}
iter.ReportError("protobuf", fmt.Sprintf(`%s: missing "@type" field`, Any_message_fullname))
return
}
resolver := c.ext.GetResolver()
emt, err := resolver.FindMessageByURL(typeUrl)
if err != nil {
iter.ReportError("protobuf", fmt.Sprintf("%s: unable to resolve %q: %v", Any_message_fullname, typeUrl, err))
return
}
em := emt.New().Interface()
var subIter *jsoniter.Iterator
if IsWellKnownType(reflect2.TypeOf(em)) {
if !fields["value"] {
iter.ReportError("protobuf", fmt.Sprintf(`%s: missing "value" field`, Any_message_fullname))
return
}
subIter = iter.API().BorrowIterator(valueBytes)
} else {
subIter = iter.API().BorrowIterator(subStream.Buffer())
}
subIter.Attachment = iter.Attachment
defer iter.API().ReturnIterator(subIter)
subIter.ReadVal(em)
if subIter.Error != nil && subIter.Error != io.EOF {
iter.ReportError("protobuf", fmt.Sprintf("%s: unable to unmarshal %q: %v", Any_message_fullname, typeUrl, subIter.Error))
return
}
b, err := proto.MarshalOptions{
AllowPartial: true, // No need to check required fields inside an Any.
Deterministic: true,
}.Marshal(em)
if err != nil {
iter.ReportError("protobuf", fmt.Sprintf("error in marshaling Any.value field: %v", err))
return
}
m.TypeUrl = typeUrl
m.Value = b
}
var wktAnyCodec = &ProtoCodec{
EncoderCreator: func(e *ProtoExtension, typ reflect2.Type) jsoniter.ValEncoder {
return WrapElemEncoder(typ, &wktAnyEncoder{ext: e}, nil)
},
DecoderCreator: func(e *ProtoExtension, typ reflect2.Type) jsoniter.ValDecoder {
return WrapElemDecoder(typ, &wktAnyDecoder{ext: e}, nil)
},
}