120 lines
2.3 KiB
Go
120 lines
2.3 KiB
Go
// Package grpc provides a grpc codec
|
|
package grpc
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"io"
|
|
"strings"
|
|
|
|
"github.com/golang/protobuf/proto"
|
|
"github.com/micro/go-micro/codec"
|
|
)
|
|
|
|
type Codec struct {
|
|
Conn io.ReadWriteCloser
|
|
ContentType string
|
|
}
|
|
|
|
func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
|
|
if ct := m.Header["Content-Type"]; len(ct) > 0 {
|
|
c.ContentType = ct
|
|
}
|
|
|
|
if ct := m.Header["content-type"]; len(ct) > 0 {
|
|
c.ContentType = ct
|
|
}
|
|
|
|
// service method
|
|
path := m.Header[":path"]
|
|
if len(path) == 0 || path[0] != '/' {
|
|
m.Target = m.Header["X-Micro-Service"]
|
|
m.Endpoint = m.Header["X-Micro-Endpoint"]
|
|
} else {
|
|
// [ , a.package.Foo, Bar]
|
|
parts := strings.Split(path, "/")
|
|
if len(parts) != 3 {
|
|
return errors.New("Unknown request path")
|
|
}
|
|
service := strings.Split(parts[1], ".")
|
|
m.Endpoint = strings.Join([]string{service[len(service)-1], parts[2]}, ".")
|
|
m.Target = strings.Join(service[:len(service)-1], ".")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Codec) ReadBody(b interface{}) error {
|
|
// no body
|
|
if b == nil {
|
|
return nil
|
|
}
|
|
|
|
_, buf, err := decode(c.Conn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
switch c.ContentType {
|
|
case "application/grpc+json":
|
|
return json.Unmarshal(buf, b)
|
|
case "application/grpc+proto", "application/grpc":
|
|
return proto.Unmarshal(buf, b.(proto.Message))
|
|
}
|
|
|
|
return errors.New("Unsupported Content-Type")
|
|
}
|
|
|
|
func (c *Codec) Write(m *codec.Message, b interface{}) error {
|
|
var buf []byte
|
|
var err error
|
|
|
|
if ct := m.Header["Content-Type"]; len(ct) > 0 {
|
|
c.ContentType = ct
|
|
}
|
|
|
|
if ct := m.Header["content-type"]; len(ct) > 0 {
|
|
c.ContentType = ct
|
|
}
|
|
|
|
m.Header["Trailer"] = "grpc-status, grpc-message"
|
|
|
|
switch c.ContentType {
|
|
case "application/grpc+json":
|
|
buf, err = json.Marshal(b)
|
|
case "application/grpc+proto", "application/grpc":
|
|
pb, ok := b.(proto.Message)
|
|
if ok {
|
|
buf, err = proto.Marshal(pb)
|
|
}
|
|
default:
|
|
err = errors.New("Unsupported Content-Type")
|
|
}
|
|
|
|
if err != nil {
|
|
m.Header["grpc-status"] = "8"
|
|
m.Header["grpc-message"] = err.Error()
|
|
return err
|
|
}
|
|
|
|
m.Header["grpc-status"] = "0"
|
|
m.Header["grpc-message"] = ""
|
|
|
|
return encode(0, buf, c.Conn)
|
|
}
|
|
|
|
func (c *Codec) Close() error {
|
|
return c.Conn.Close()
|
|
}
|
|
|
|
func (c *Codec) String() string {
|
|
return "grpc"
|
|
}
|
|
|
|
func NewCodec(c io.ReadWriteCloser) codec.Codec {
|
|
return &Codec{
|
|
Conn: c,
|
|
ContentType: "application/grpc",
|
|
}
|
|
}
|