60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package packets
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import (
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"bytes"
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"fmt"
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"io"
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)
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//UnsubscribePacket is an internal representation of the fields of the
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//Unsubscribe MQTT packet
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type UnsubscribePacket struct {
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FixedHeader
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MessageID uint16
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Topics []string
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}
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func (u *UnsubscribePacket) String() string {
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str := fmt.Sprintf("%s", u.FixedHeader)
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str += " "
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str += fmt.Sprintf("MessageID: %d", u.MessageID)
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return str
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}
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func (u *UnsubscribePacket) Write(w io.Writer) error {
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var body bytes.Buffer
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var err error
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body.Write(encodeUint16(u.MessageID))
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for _, topic := range u.Topics {
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body.Write(encodeString(topic))
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}
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u.FixedHeader.RemainingLength = body.Len()
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packet := u.FixedHeader.pack()
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packet.Write(body.Bytes())
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_, err = packet.WriteTo(w)
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return err
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}
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//Unpack decodes the details of a ControlPacket after the fixed
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//header has been read
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func (u *UnsubscribePacket) Unpack(b io.Reader) error {
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var err error
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u.MessageID, err = decodeUint16(b)
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if err != nil {
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return err
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}
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for topic, err := decodeString(b); err == nil && topic != ""; topic, err = decodeString(b) {
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u.Topics = append(u.Topics, topic)
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}
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return err
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}
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//Details returns a Details struct containing the Qos and
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//MessageID of this ControlPacket
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func (u *UnsubscribePacket) Details() Details {
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return Details{Qos: 1, MessageID: u.MessageID}
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}
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