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message.go
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message.go
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package trans
import (
"encoding/binary"
"net"
"github.com/lucas-clemente/quic-go"
)
const action_size = 1
const key_size = 4
const value_size = 4
const header_size = action_size + key_size + value_size
type action byte
const (
act_get action = iota
act_put
act_del
act_size
act_get_keys
act_ping
act_pong
act_conn_keep
act_conn_close
act_checksum
)
type Msg struct {
Act action
Key string
Value []byte
}
type Head struct {
Act action
KSize uint32
VSize uint32
}
/**
action : key size : value size : key : value
1 : 4 : 4 : n : n
**/
func (m *Msg) Encode() []byte {
klen := len(m.Key)
vlen := len(m.Value)
ret := make([]byte, header_size+klen+vlen)
// retref := vBuf.Get().(*[]byte)
// (*buffer)(retref).size(header_size + klen + vlen)
// ret := *retref
// action
ret[0] = byte(m.Act)
// key size
binary.LittleEndian.PutUint32(ret[action_size:action_size+key_size], uint32(klen))
// value size
binary.LittleEndian.PutUint32(ret[action_size+key_size:header_size], uint32(vlen))
// write key
copy(ret[header_size:header_size+klen], []byte(m.Key))
// write value
copy(ret[header_size+klen:], m.Value)
return ret
}
func (m *Msg) FromBytes(buf []byte) (err error) {
if len(buf) < header_size {
return ErrMsgFormat
}
h, _ := HeadFrom(buf[:header_size])
m.From(h, buf[header_size:])
return
}
// the buf here only contains bytes of key and value, no header bytes here
func (m *Msg) From(h *Head, buf []byte) {
m.Act = h.Act
// read key
kb := make([]byte, h.KSize)
copy(kb, buf[:h.KSize])
m.Key = string(kb)
// read value
if m.Value == nil {
// v := vBuf.Get().(*[]byte)
// (*buffer)(v).size(int(h.VSize))
// m.Value = *v
m.Value = make([]byte, h.VSize)
}
copy(m.Value, buf[h.KSize:])
}
func HeadFrom(buf []byte) (h *Head, err error) {
if len(buf) < header_size {
return nil, ErrMsgFormat
}
h = &Head{}
// read action
h.Act = action(buf[0])
// key size
h.KSize = binary.LittleEndian.Uint32(buf[action_size : action_size+key_size])
// value size
h.VSize = binary.LittleEndian.Uint32(buf[action_size+key_size : header_size])
return
}
func (act action) String() string {
switch act {
case act_get:
return "get"
case act_put:
return "put"
case act_del:
return "delete"
case act_size:
return "size"
case act_get_keys:
return "get keys"
case act_ping:
return "ping"
case act_pong:
return "pong"
case act_conn_keep:
return "keep connection"
case act_conn_close:
return "close connection"
case act_checksum:
return "checksum"
default:
return "unknown action"
}
}
const repcode_size = 1
const repbody_size = 4
const rephead_size = repcode_size + repbody_size
type repcode byte
const (
rep_success repcode = iota
rep_failed
rep_nofound
rep_timeout
)
type Reply struct {
Code repcode
Body []byte
}
type ReplyHead struct {
Code repcode
BodySize uint32
}
/**
repcode : body size : body
1 : 4 : n
**/
func (r *Reply) Encode() []byte {
blen := len(r.Body)
ret := make([]byte, rephead_size+blen)
// action
ret[0] = byte(r.Code)
// body size
binary.LittleEndian.PutUint32(ret[repcode_size:rephead_size], uint32(blen))
// write value
copy(ret[rephead_size:], r.Body)
return ret
}
// Caution: buf here only contains bytes of body
func (r *Reply) From(h *ReplyHead, buf []byte) {
r.Code = h.Code
r.Body = buf
}
func ReplyHeadFrom(buf []byte) (h *ReplyHead, err error) {
if len(buf) < rephead_size {
return nil, ErrReplyFormat
}
h = &ReplyHead{}
// read repcode
h.Code = repcode(buf[0])
// body size
h.BodySize = binary.LittleEndian.Uint32(buf[repcode_size:rephead_size])
return
}
func (r *Reply) Dump(w net.Conn) (n int, err error) {
blen := len(r.Body)
// retref := vBuf.Get().(*[]byte)
// (*buffer)(retref).size(rephead_size + blen)
// defer vBuf.Put(retref)
// ret := *retref
ret := make([]byte, rephead_size+blen)
// action
ret[0] = byte(r.Code)
// body size
binary.LittleEndian.PutUint32(ret[repcode_size:rephead_size], uint32(blen))
// write value
copy(ret[rephead_size:], r.Body)
return w.Write(ret)
}
func (r *Reply) DumpQuic(w quic.Stream) (n int, err error) {
blen := len(r.Body)
// retref := vBuf.Get().(*[]byte)
// (*buffer)(retref).size(rephead_size + blen)
// defer vBuf.Put(retref)
// ret := *retref
ret := make([]byte, rephead_size+blen)
// action
ret[0] = byte(r.Code)
// body size
binary.LittleEndian.PutUint32(ret[repcode_size:rephead_size], uint32(blen))
// write value
copy(ret[rephead_size:], r.Body)
return w.Write(ret)
}