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package packets
import (
"bytes"
"fmt"
"github.com/pborman/uuid"
"io"
)
//SubackPacket is an internal representation of the fields of the
//Suback MQTT packet
type SubackPacket struct {
FixedHeader
MessageID uint16
GrantedQoss []byte
uuid uuid.UUID
}
func (sa *SubackPacket) String() string {
str := fmt.Sprintf("%s\n", sa.FixedHeader)
str += fmt.Sprintf("MessageID: %d", sa.MessageID)
return str
}
func (sa *SubackPacket) Write(w io.Writer) error {
var body bytes.Buffer
var err error
body.Write(encodeUint16(sa.MessageID))
body.Write(sa.GrantedQoss)
sa.FixedHeader.RemainingLength = body.Len()
packet := sa.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 (sa *SubackPacket) Unpack(b io.Reader) {
var qosBuffer bytes.Buffer
sa.MessageID = decodeUint16(b)
qosBuffer.ReadFrom(b)
sa.GrantedQoss = qosBuffer.Bytes()
}
//Details returns a Details struct containing the Qos and
//MessageID of this ControlPacket
func (sa *SubackPacket) Details() Details {
return Details{Qos: 0, MessageID: sa.MessageID}
}
//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 (sa *SubackPacket) UUID() uuid.UUID {
return sa.uuid
}
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