micro/codec/codec.go
2016-12-14 15:41:48 +00:00

44 lines
1.0 KiB
Go

// Package codec is an interface for encoding messages
package codec
import (
"io"
)
const (
Error MessageType = iota
Request
Response
Publication
)
type MessageType int
// Takes in a connection/buffer and returns a new Codec
type NewCodec func(io.ReadWriteCloser) Codec
// Codec encodes/decodes various types of messages used within go-micro.
// ReadHeader and ReadBody are called in pairs to read requests/responses
// from the connection. Close is called when finished with the
// connection. ReadBody may be called with a nil argument to force the
// body to be read and discarded.
type Codec interface {
ReadHeader(*Message, MessageType) error
ReadBody(interface{}) error
Write(*Message, interface{}) error
Close() error
String() string
}
// Message represents detailed information about
// the communication, likely followed by the body.
// In the case of an error, body may be nil.
type Message struct {
Id uint64
Type MessageType
Target string
Method string
Error string
Header map[string]string
}