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/*
* 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}
}
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