mirror of
https://github.com/crazy-max/diun.git
synced 2024-12-22 19:38:28 +00:00
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
/*
|
|
* Copyright (c) 2021 IBM Corp and others.
|
|
*
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v2.0
|
|
* and Eclipse Distribution License v1.0 which accompany this distribution.
|
|
*
|
|
* The Eclipse Public License is available at
|
|
* https://www.eclipse.org/legal/epl-2.0/
|
|
* and the Eclipse Distribution License is available at
|
|
* http://www.eclipse.org/org/documents/edl-v10.php.
|
|
*
|
|
* Contributors:
|
|
* Allan Stockdill-Mander
|
|
*/
|
|
|
|
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 {
|
|
return fmt.Sprintf("%s MessageID: %d", u.FixedHeader, u.MessageID)
|
|
}
|
|
|
|
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 {
|
|
var err error
|
|
u.MessageID, err = decodeUint16(b)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for topic, err := decodeString(b); err == nil && topic != ""; topic, err = decodeString(b) {
|
|
u.Topics = append(u.Topics, topic)
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// 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}
|
|
}
|