micro-codec-proto/proto.go

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// Package proto provides a proto codec
package proto
import (
pb "go.unistack.org/micro-proto/v3/codec"
"go.unistack.org/micro/v3/codec"
rutil "go.unistack.org/micro/v3/util/reflect"
"google.golang.org/protobuf/proto"
)
var (
DefaultMarshalOptions = proto.MarshalOptions{
AllowPartial: false,
}
DefaultUnmarshalOptions = proto.UnmarshalOptions{
DiscardUnknown: false,
AllowPartial: false,
}
)
type protoCodec struct {
opts codec.Options
}
type protoCodecV2 struct {
opts codec.Options
}
var (
_ codec.Codec = (*protoCodec)(nil)
_ codec.CodecV2 = (*protoCodecV2)(nil)
)
func (c *protoCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
if v == nil {
return nil, nil
}
options := c.opts
for _, o := range opts {
o(&options)
}
if options.Flatten {
if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
v = nv
}
}
switch m := v.(type) {
case *codec.Frame:
return m.Data, nil
case *pb.Frame:
return m.Data, nil
case proto.Message:
marshalOptions := DefaultMarshalOptions
if options.Context != nil {
if f, ok := options.Context.Value(marshalOptionsKey{}).(proto.MarshalOptions); ok {
marshalOptions = f
}
}
return marshalOptions.Marshal(m)
default:
return nil, codec.ErrInvalidMessage
}
}
func (c *protoCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
if v == nil || len(d) == 0 {
return nil
}
options := c.opts
for _, o := range opts {
o(&options)
}
if options.Flatten {
if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
v = nv
}
}
switch m := v.(type) {
case *codec.Frame:
m.Data = d
return nil
case *pb.Frame:
m.Data = d
return nil
case proto.Message:
unmarshalOptions := DefaultUnmarshalOptions
if options.Context != nil {
if f, ok := options.Context.Value(marshalOptionsKey{}).(proto.UnmarshalOptions); ok {
unmarshalOptions = f
}
}
return unmarshalOptions.Unmarshal(d, m)
default:
return codec.ErrInvalidMessage
}
}
func (c *protoCodec) String() string {
return "proto"
}
func NewCodec(opts ...codec.Option) codec.Codec {
return &protoCodec{opts: codec.NewOptions(opts...)}
}
func (c *protoCodecV2) Marshal(d []byte, v interface{}, opts ...codec.Option) ([]byte, error) {
if v == nil {
return nil, nil
}
options := c.opts
for _, o := range opts {
o(&options)
}
if options.Flatten {
if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
v = nv
}
}
switch m := v.(type) {
case *codec.Frame:
return m.Data, nil
case *pb.Frame:
return m.Data, nil
case proto.Message:
marshalOptions := DefaultMarshalOptions
if options.Context != nil {
if f, ok := options.Context.Value(marshalOptionsKey{}).(proto.MarshalOptions); ok {
marshalOptions = f
}
}
return marshalOptions.MarshalAppend(d, m)
default:
return nil, codec.ErrInvalidMessage
}
}
func (c *protoCodecV2) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
if v == nil || len(d) == 0 {
return nil
}
options := c.opts
for _, o := range opts {
o(&options)
}
if options.Flatten {
if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
v = nv
}
}
switch m := v.(type) {
case *codec.Frame:
m.Data = d
return nil
case *pb.Frame:
m.Data = d
return nil
case proto.Message:
unmarshalOptions := DefaultUnmarshalOptions
if options.Context != nil {
if f, ok := options.Context.Value(marshalOptionsKey{}).(proto.UnmarshalOptions); ok {
unmarshalOptions = f
}
}
return unmarshalOptions.Unmarshal(d, m)
default:
return codec.ErrInvalidMessage
}
}
func (c *protoCodecV2) String() string {
return "proto"
}
func NewCodecV2(opts ...codec.Option) codec.CodecV2 {
return &protoCodecV2{opts: codec.NewOptions(opts...)}
}