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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"
)
// SubackPacket is an internal representation of the fields of the
// Suback MQTT packet
type SubackPacket struct {
FixedHeader
MessageID uint16
ReturnCodes []byte
}
func (sa *SubackPacket) String() string {
return fmt.Sprintf("%s MessageID: %d", sa.FixedHeader, sa.MessageID)
}
func (sa *SubackPacket) Write(w io.Writer) error {
var body bytes.Buffer
var err error
body.Write(encodeUint16(sa.MessageID))
body.Write(sa.ReturnCodes)
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) error {
var qosBuffer bytes.Buffer
var err error
sa.MessageID, err = decodeUint16(b)
if err != nil {
return err
}
_, err = qosBuffer.ReadFrom(b)
if err != nil {
return err
}
sa.ReturnCodes = qosBuffer.Bytes()
return nil
}
// 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}
}
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