You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.2 KiB
56 lines
1.2 KiB
8 years ago
|
package packets
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
)
|
||
|
|
|
||
|
|
//UnsubscribePacket is an internal representation of the fields of the
|
||
|
|
//Unsubscribe MQTT packet
|
||
|
|
type UnsubscribePacket struct {
|
||
|
|
FixedHeader
|
||
|
|
MessageID uint16
|
||
|
|
Topics []string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (u *UnsubscribePacket) String() string {
|
||
|
|
str := fmt.Sprintf("%s", u.FixedHeader)
|
||
|
|
str += " "
|
||
|
|
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) error {
|
||
|
|
u.MessageID = decodeUint16(b)
|
||
|
|
var topic string
|
||
|
|
for topic = decodeString(b); topic != ""; topic = decodeString(b) {
|
||
|
|
u.Topics = append(u.Topics, topic)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
//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}
|
||
|
|
}
|