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package packets
import (
"bytes"
"fmt"
"github.com/pborman/uuid"
"io"
)
//UnsubscribePacket is an internal representation of the fields of the
//Unsubscribe MQTT packet
type UnsubscribePacket struct {
FixedHeader
MessageID uint16
Topics []string
uuid uuid.UUID
}
func (u *UnsubscribePacket) String() string {
str := fmt.Sprintf("%s\n", u.FixedHeader)
str += fmt.Sprintf("MessageID: %d", u.MessageID)
return str
}
func (u *UnsubscribePacket) Write(w io.Writer) error {
var body bytes.Buffer
var err error
body.Write(encodeUint16(u.MessageID))
for _, topic := range u.Topics {
body.Write(encodeString(topic))
}
u.FixedHeader.RemainingLength = body.Len()
packet := u.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 (u *UnsubscribePacket) Unpack(b io.Reader) {
u.MessageID = decodeUint16(b)
var topic string
for topic = decodeString(b); topic != ""; topic = decodeString(b) {
u.Topics = append(u.Topics, topic)
}
}
//Details returns a Details struct containing the Qos and
//MessageID of this ControlPacket
func (u *UnsubscribePacket) Details() Details {
return Details{Qos: 1, MessageID: u.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 (u *UnsubscribePacket) UUID() uuid.UUID {
return u.uuid
}
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