Vasiliy Tolstov 2fe69ffcb8 guard import
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2021-10-25 20:39:17 +03:00

121 lines
2.2 KiB
Go

// Package proto provides a proto codec
package proto // import "go.unistack.org/micro-codec-segmentio/v3/proto"
import (
"io"
"github.com/segmentio/encoding/proto"
"go.unistack.org/micro/v3/codec"
rutil "go.unistack.org/micro/v3/util/reflect"
newproto "google.golang.org/protobuf/proto"
)
type protoCodec struct {
opts codec.Options
}
var _ codec.Codec = &protoCodec{}
const (
flattenTag = "flatten"
)
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 nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
v = nv
}
if m, ok := v.(*codec.Frame); ok {
return m.Data, nil
}
switch m := v.(type) {
case proto.Message:
return proto.Marshal(m)
case newproto.Message:
return proto.Marshal(m)
}
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 nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
v = nv
}
if m, ok := v.(*codec.Frame); ok {
m.Data = d
return nil
}
switch m := v.(type) {
case proto.Message:
return proto.Unmarshal(d, m)
case newproto.Message:
return proto.Unmarshal(d, m)
}
return codec.ErrInvalidMessage
}
func (c *protoCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
return nil
}
func (c *protoCodec) ReadBody(conn io.Reader, v interface{}) error {
if v == nil {
return nil
}
buf, err := io.ReadAll(conn)
if err != nil {
return err
} else if len(buf) == 0 {
return nil
}
return c.Unmarshal(buf, v)
}
func (c *protoCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
if v == nil {
return nil
}
buf, err := c.Marshal(v)
if err != nil {
return err
} else if len(buf) == 0 {
return codec.ErrInvalidMessage
}
_, err = conn.Write(buf)
return err
}
func (c *protoCodec) String() string {
return "proto"
}
func NewCodec(opts ...codec.Option) *protoCodec {
return &protoCodec{opts: codec.NewOptions(opts...)}
}