58 lines
1.2 KiB
Go
58 lines
1.2 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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// SubackPacket is an internal representation of the fields of the
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// Suback MQTT packet
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type SubackPacket struct {
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FixedHeader
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MessageID uint16
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ReturnCodes []byte
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}
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func (sa *SubackPacket) String() string {
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return fmt.Sprintf("%s MessageID: %d", sa.FixedHeader, sa.MessageID)
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}
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func (sa *SubackPacket) 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(sa.MessageID))
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body.Write(sa.ReturnCodes)
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sa.FixedHeader.RemainingLength = body.Len()
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packet := sa.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 (sa *SubackPacket) Unpack(b io.Reader) error {
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var qosBuffer bytes.Buffer
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var err error
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sa.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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_, err = qosBuffer.ReadFrom(b)
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if err != nil {
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return err
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}
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sa.ReturnCodes = qosBuffer.Bytes()
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return nil
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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 (sa *SubackPacket) Details() Details {
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return Details{Qos: 0, MessageID: sa.MessageID}
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}
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