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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,292 @@ | ||
| package legacygwjsonpb | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "reflect" | ||
|
|
||
| "github.com/golang/protobuf/jsonpb" | ||
| "github.com/golang/protobuf/proto" | ||
| gw "github.com/grpc-ecosystem/grpc-gateway/v2/runtime" | ||
| protoV2 "google.golang.org/protobuf/proto" | ||
| ) | ||
|
|
||
| // JSONPb is a Marshaler which marshals/unmarshals into/from JSON | ||
| // with the "github.com/golang/protobuf/jsonpb". | ||
| // It supports fully functionality of protobuf unlike JSONBuiltin. | ||
| // | ||
| // The NewDecoder method returns a DecoderWrapper, so the underlying | ||
| // *json.Decoder methods can be used. | ||
| type JSONPb jsonpb.Marshaler | ||
|
|
||
| // ContentType always returns "application/json". | ||
| func (*JSONPb) ContentType(v interface{}) string { | ||
| return "application/json" | ||
| } | ||
|
|
||
| // Marshal marshals "v" into JSON. | ||
| func (j *JSONPb) Marshal(vv interface{}) (ret []byte, retErr error) { | ||
| var v interface{} = vv | ||
|
|
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| // For unary api, the gateway always convert the messageV1 into V2. | ||
| // We should convert it back. And for the streaming api, the input is | ||
| // kind of map, we can't just call the proto.MessageV1 because it | ||
| // will panic :) | ||
| // | ||
| // REF: github.com/grpc-ecosystem/grpc-gateway/[email protected]/runtime/handler.goL75 | ||
| if _, ok := vv.(protoV2.Message); ok { | ||
| v = proto.MessageV1(vv) | ||
| } | ||
|
|
||
| if _, ok := v.(proto.Message); !ok { | ||
| return j.marshalNonProtoField(v) | ||
| } | ||
|
|
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| var buf bytes.Buffer | ||
| if err := j.marshalTo(&buf, v); err != nil { | ||
| return nil, err | ||
| } | ||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func (j *JSONPb) marshalTo(w io.Writer, v interface{}) error { | ||
| p, ok := v.(proto.Message) | ||
| if !ok { | ||
| buf, err := j.marshalNonProtoField(v) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, err = w.Write(buf) | ||
| return err | ||
| } | ||
| return (*jsonpb.Marshaler)(j).Marshal(w, p) | ||
| } | ||
|
|
||
| var ( | ||
| // protoMessageType is stored to prevent constant lookup of the same type at runtime. | ||
| protoMessageType = reflect.TypeOf((*proto.Message)(nil)).Elem() | ||
| ) | ||
|
|
||
| // marshalNonProto marshals a non-message field of a protobuf message. | ||
| // This function does not correctly marshals arbitrary data structure into JSON, | ||
| // but it is only capable of marshaling non-message field values of protobuf, | ||
| // i.e. primitive types, enums; pointers to primitives or enums; maps from | ||
| // integer/string types to primitives/enums/pointers to messages. | ||
| func (j *JSONPb) marshalNonProtoField(v interface{}) ([]byte, error) { | ||
| if v == nil { | ||
| return []byte("null"), nil | ||
| } | ||
| rv := reflect.ValueOf(v) | ||
| for rv.Kind() == reflect.Ptr { | ||
| if rv.IsNil() { | ||
| return []byte("null"), nil | ||
| } | ||
| rv = rv.Elem() | ||
| } | ||
|
|
||
| if rv.Kind() == reflect.Slice { | ||
| if rv.IsNil() { | ||
| if j.EmitDefaults { | ||
| return []byte("[]"), nil | ||
| } | ||
| return []byte("null"), nil | ||
| } | ||
|
|
||
| if rv.Type().Elem().Implements(protoMessageType) { | ||
| var buf bytes.Buffer | ||
| err := buf.WriteByte('[') | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for i := 0; i < rv.Len(); i++ { | ||
| if i != 0 { | ||
| err = buf.WriteByte(',') | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| if err = (*jsonpb.Marshaler)(j).Marshal(&buf, rv.Index(i).Interface().(proto.Message)); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| err = buf.WriteByte(']') | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return buf.Bytes(), nil | ||
| } | ||
| } | ||
|
|
||
| if rv.Kind() == reflect.Map { | ||
| m := make(map[string]*json.RawMessage) | ||
| for _, k := range rv.MapKeys() { | ||
| buf, err := j.Marshal(rv.MapIndex(k).Interface()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| m[fmt.Sprintf("%v", k.Interface())] = (*json.RawMessage)(&buf) | ||
| } | ||
| if j.Indent != "" { | ||
| return json.MarshalIndent(m, "", j.Indent) | ||
| } | ||
| return json.Marshal(m) | ||
| } | ||
| if enum, ok := rv.Interface().(protoEnum); ok && !j.EnumsAsInts { | ||
| return json.Marshal(enum.String()) | ||
| } | ||
| return json.Marshal(rv.Interface()) | ||
| } | ||
|
|
||
| // Unmarshal unmarshals JSON "data" into "v" | ||
| func (j *JSONPb) Unmarshal(data []byte, v interface{}) error { | ||
| return unmarshalJSONPb(data, v) | ||
| } | ||
|
|
||
| // NewDecoder returns a Decoder which reads JSON stream from "r". | ||
| func (j *JSONPb) NewDecoder(r io.Reader) gw.Decoder { | ||
| d := json.NewDecoder(r) | ||
| return DecoderWrapper{Decoder: d} | ||
| } | ||
|
|
||
| // DecoderWrapper is a wrapper around a *json.Decoder that adds | ||
| // support for protos to the Decode method. | ||
| type DecoderWrapper struct { | ||
| *json.Decoder | ||
| } | ||
|
|
||
| // Decode wraps the embedded decoder's Decode method to support | ||
| // protos using a jsonpb.Unmarshaler. | ||
| func (d DecoderWrapper) Decode(v interface{}) error { | ||
| return decodeJSONPb(d.Decoder, v) | ||
| } | ||
|
|
||
| // NewEncoder returns an Encoder which writes JSON stream into "w". | ||
| func (j *JSONPb) NewEncoder(w io.Writer) gw.Encoder { | ||
| return gw.EncoderFunc(func(vv interface{}) error { | ||
| v := proto.MessageV1(vv) | ||
|
|
||
| if err := j.marshalTo(w, v); err != nil { | ||
| return err | ||
| } | ||
| // mimic json.Encoder by adding a newline (makes output | ||
| // easier to read when it contains multiple encoded items) | ||
| _, err := w.Write(j.Delimiter()) | ||
| return err | ||
| }) | ||
| } | ||
|
|
||
| func unmarshalJSONPb(data []byte, v interface{}) error { | ||
| d := json.NewDecoder(bytes.NewReader(data)) | ||
| return decodeJSONPb(d, v) | ||
| } | ||
|
|
||
| func decodeJSONPb(d *json.Decoder, v interface{}) error { | ||
| p, ok := v.(proto.Message) | ||
| if !ok { | ||
| return decodeNonProtoField(d, v) | ||
| } | ||
| unmarshaler := &jsonpb.Unmarshaler{AllowUnknownFields: allowUnknownFields} | ||
| return unmarshaler.UnmarshalNext(d, p) | ||
| } | ||
|
|
||
| func decodeNonProtoField(d *json.Decoder, v interface{}) error { | ||
| rv := reflect.ValueOf(v) | ||
| if rv.Kind() != reflect.Ptr { | ||
| return fmt.Errorf("%T is not a pointer", v) | ||
| } | ||
| for rv.Kind() == reflect.Ptr { | ||
| if rv.IsNil() { | ||
| rv.Set(reflect.New(rv.Type().Elem())) | ||
| } | ||
| if rv.Type().ConvertibleTo(typeProtoMessage) { | ||
| unmarshaler := &jsonpb.Unmarshaler{AllowUnknownFields: allowUnknownFields} | ||
| return unmarshaler.UnmarshalNext(d, rv.Interface().(proto.Message)) | ||
| } | ||
| rv = rv.Elem() | ||
| } | ||
| if rv.Kind() == reflect.Map { | ||
| if rv.IsNil() { | ||
| rv.Set(reflect.MakeMap(rv.Type())) | ||
| } | ||
| conv, ok := convFromType[rv.Type().Key().Kind()] | ||
| if !ok { | ||
| return fmt.Errorf("unsupported type of map field key: %v", rv.Type().Key()) | ||
| } | ||
|
|
||
| m := make(map[string]*json.RawMessage) | ||
| if err := d.Decode(&m); err != nil { | ||
| return err | ||
| } | ||
| for k, v := range m { | ||
| result := conv.Call([]reflect.Value{reflect.ValueOf(k)}) | ||
| if err := result[1].Interface(); err != nil { | ||
| return err.(error) | ||
| } | ||
| bk := result[0] | ||
| bv := reflect.New(rv.Type().Elem()) | ||
| if err := unmarshalJSONPb([]byte(*v), bv.Interface()); err != nil { | ||
| return err | ||
| } | ||
| rv.SetMapIndex(bk, bv.Elem()) | ||
| } | ||
| return nil | ||
| } | ||
| if _, ok := rv.Interface().(protoEnum); ok { | ||
| var repr interface{} | ||
| if err := d.Decode(&repr); err != nil { | ||
| return err | ||
| } | ||
| switch repr.(type) { | ||
| case string: | ||
| // TODO(yugui) Should use proto.StructProperties? | ||
| return fmt.Errorf("unmarshaling of symbolic enum %q not supported: %T", repr, rv.Interface()) | ||
| case float64: | ||
| rv.Set(reflect.ValueOf(int32(repr.(float64))).Convert(rv.Type())) | ||
| return nil | ||
| default: | ||
| return fmt.Errorf("cannot assign %#v into Go type %T", repr, rv.Interface()) | ||
| } | ||
| } | ||
| return d.Decode(v) | ||
| } | ||
|
|
||
| type protoEnum interface { | ||
| fmt.Stringer | ||
| EnumDescriptor() ([]byte, []int) | ||
| } | ||
|
|
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| var typeProtoMessage = reflect.TypeOf((*proto.Message)(nil)).Elem() | ||
|
|
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| // Delimiter for newline encoded JSON streams. | ||
| func (j *JSONPb) Delimiter() []byte { | ||
| return []byte("\n") | ||
| } | ||
|
|
||
| // allowUnknownFields helps not to return an error when the destination | ||
| // is a struct and the input contains object keys which do not match any | ||
| // non-ignored, exported fields in the destination. | ||
| var allowUnknownFields = true | ||
|
|
||
| // DisallowUnknownFields enables option in decoder (unmarshaller) to | ||
| // return an error when it finds an unknown field. This function must be | ||
| // called before using the JSON marshaller. | ||
| func DisallowUnknownFields() { | ||
| allowUnknownFields = false | ||
| } | ||
|
|
||
| var ( | ||
| convFromType = map[reflect.Kind]reflect.Value{ | ||
| reflect.String: reflect.ValueOf(gw.String), | ||
| reflect.Bool: reflect.ValueOf(gw.Bool), | ||
| reflect.Float64: reflect.ValueOf(gw.Float64), | ||
| reflect.Float32: reflect.ValueOf(gw.Float32), | ||
| reflect.Int64: reflect.ValueOf(gw.Int64), | ||
| reflect.Int32: reflect.ValueOf(gw.Int32), | ||
| reflect.Uint64: reflect.ValueOf(gw.Uint64), | ||
| reflect.Uint32: reflect.ValueOf(gw.Uint32), | ||
| reflect.Slice: reflect.ValueOf(gw.Bytes), | ||
| } | ||
| ) |
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