/
message_connack.go
79 lines (64 loc) · 1.28 KB
/
message_connack.go
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package packet
import (
"fmt"
"github.com/MajaSuite/mqtt/utils"
)
const (
ConnectAccepted int = iota
ConnectUnacceptableProtocol
ConnectIndentifierRejected
ConnectServerUnavailable
ConnectBadUserPass
ConnectNotAuthorized
)
type ConnAckPacket struct {
PacketImpl
Header byte
Session bool
ReturnCode uint8
}
func NewConnAck() *ConnAckPacket {
return &ConnAckPacket{}
}
func CreateConnAck(buf byte) *ConnAckPacket {
return &ConnAckPacket{
Header: buf,
Session: false,
}
}
func (cack *ConnAckPacket) Type() Type {
return CONNACK
}
func (cack *ConnAckPacket) Length() int {
return 2
}
func (cack *ConnAckPacket) Unpack(buf []byte) error {
acknowledge, offset, err := utils.ReadInt8(buf, 0)
if err != nil {
return err
}
if acknowledge > 1 {
return ErrProtocolError
}
cack.Session = (acknowledge == 1)
cack.ReturnCode, offset, err = utils.ReadInt8(buf, offset)
if err != nil {
return err
}
return nil
}
func (cack *ConnAckPacket) Pack() []byte {
buf := make([]byte, 4)
buf[0] = byte(CONNACK) << 4
buf[1] = byte(2) // length
if cack.Session {
buf[2] = 0x01
} else {
buf[2] = 0
}
buf[3] = cack.ReturnCode
return buf
}
func (cack *ConnAckPacket) String() string {
return fmt.Sprintf("ConnAck: {session: %v, code: %v}", cack.Session, cack.ReturnCode)
}