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