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package packets
import (
"bytes"
"fmt"
"github.com/pborman/uuid"
"io"
)
//ConnackPacket is an internal representation of the fields of the
//Connack MQTT packet
type ConnackPacket struct {
FixedHeader
TopicNameCompression byte
ReturnCode byte
uuid uuid.UUID
}
func (ca *ConnackPacket) String() string {
str := fmt.Sprintf("%s\n", ca.FixedHeader)
str += fmt.Sprintf("returncode: %d", ca.ReturnCode)
return str
}
func (ca *ConnackPacket) Write(w io.Writer) error {
var body bytes.Buffer
var err error
body.WriteByte(ca.TopicNameCompression)
body.WriteByte(ca.ReturnCode)
ca.FixedHeader.RemainingLength = 2
packet := ca.FixedHeader.pack()
packet.Write(body.Bytes())
_, err = packet.WriteTo(w)
return err
}
//Unpack decodes the details of a ControlPacket after the fixed
//header has been read
func (ca *ConnackPacket) Unpack(b io.Reader) {
ca.TopicNameCompression = decodeByte(b)
ca.ReturnCode = decodeByte(b)
}
//Details returns a Details struct containing the Qos and
//MessageID of this ControlPacket
func (ca *ConnackPacket) Details() Details {
return Details{Qos: 0, MessageID: 0}
}
//UUID returns the unique ID assigned to the ControlPacket when
//it was originally received. Note: this is not related to the
//MessageID field for MQTT packets
func (ca *ConnackPacket) UUID() uuid.UUID {
return ca.uuid
}
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