package grpc import ( "encoding/json" "strings" b "bytes" "github.com/golang/protobuf/jsonpb" "github.com/golang/protobuf/proto" "github.com/micro/go-micro/v2/codec" "github.com/micro/go-micro/v2/codec/bytes" "google.golang.org/grpc" "google.golang.org/grpc/encoding" "google.golang.org/grpc/metadata" ) type jsonCodec struct{} type bytesCodec struct{} type protoCodec struct{} type wrapCodec struct{ encoding.Codec } var jsonpbMarshaler = &jsonpb.Marshaler{} var ( defaultGRPCCodecs = map[string]encoding.Codec{ "application/json": jsonCodec{}, "application/proto": protoCodec{}, "application/protobuf": protoCodec{}, "application/octet-stream": protoCodec{}, "application/grpc": protoCodec{}, "application/grpc+json": jsonCodec{}, "application/grpc+proto": protoCodec{}, "application/grpc+bytes": bytesCodec{}, } ) func (w wrapCodec) String() string { return w.Codec.Name() } func (w wrapCodec) Marshal(v interface{}) ([]byte, error) { b, ok := v.(*bytes.Frame) if ok { return b.Data, nil } return w.Codec.Marshal(v) } func (w wrapCodec) Unmarshal(data []byte, v interface{}) error { b, ok := v.(*bytes.Frame) if ok { b.Data = data return nil } if v == nil { return nil } return w.Codec.Unmarshal(data, v) } func (protoCodec) Marshal(v interface{}) ([]byte, error) { m, ok := v.(proto.Message) if !ok { return nil, codec.ErrInvalidMessage } return proto.Marshal(m) } func (protoCodec) Unmarshal(data []byte, v interface{}) error { m, ok := v.(proto.Message) if !ok { return codec.ErrInvalidMessage } return proto.Unmarshal(data, m) } func (protoCodec) Name() string { return "proto" } func (jsonCodec) Marshal(v interface{}) ([]byte, error) { if pb, ok := v.(proto.Message); ok { s, err := jsonpbMarshaler.MarshalToString(pb) return []byte(s), err } return json.Marshal(v) } func (jsonCodec) Unmarshal(data []byte, v interface{}) error { if len(data) == 0 { return nil } if pb, ok := v.(proto.Message); ok { return jsonpb.Unmarshal(b.NewReader(data), pb) } return json.Unmarshal(data, v) } func (jsonCodec) Name() string { return "json" } func (bytesCodec) Marshal(v interface{}) ([]byte, error) { b, ok := v.(*[]byte) if !ok { return nil, codec.ErrInvalidMessage } return *b, nil } func (bytesCodec) Unmarshal(data []byte, v interface{}) error { b, ok := v.(*[]byte) if !ok { return codec.ErrInvalidMessage } *b = data return nil } func (bytesCodec) Name() string { return "bytes" } type grpcCodec struct { // headers id string target string method string endpoint string s grpc.ServerStream c encoding.Codec } func (g *grpcCodec) ReadHeader(m *codec.Message, mt codec.MessageType) error { md, _ := metadata.FromIncomingContext(g.s.Context()) if m == nil { m = new(codec.Message) } if m.Header == nil { m.Header = make(map[string]string, len(md)) } for k, v := range md { m.Header[k] = strings.Join(v, ",") } m.Id = g.id m.Target = g.target m.Method = g.method m.Endpoint = g.endpoint return nil } func (g *grpcCodec) ReadBody(v interface{}) error { // caller has requested a frame if f, ok := v.(*bytes.Frame); ok { return g.s.RecvMsg(f) } return g.s.RecvMsg(v) } func (g *grpcCodec) Write(m *codec.Message, v interface{}) error { // if we don't have a body if v != nil { b, err := g.c.Marshal(v) if err != nil { return err } m.Body = b } // write the body using the framing codec return g.s.SendMsg(&bytes.Frame{Data: m.Body}) } func (g *grpcCodec) Close() error { return nil } func (g *grpcCodec) String() string { return "grpc" }