/
disconnect.go
47 lines (41 loc) · 1.04 KB
/
disconnect.go
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package packets
import (
"fmt"
"io"
)
// Disconnect represents the MQTT Disconnect packet
type Disconnect struct {
FixHeader *FixHeader
}
func (d *Disconnect) String() string {
return fmt.Sprintf("Disconnect")
}
// Pack encodes the packet struct into bytes and writes it into io.Writer.
func (d *Disconnect) Pack(w io.Writer) error {
var err error
d.FixHeader = &FixHeader{PacketType: DISCONNECT, Flags: FLAG_RESERVED, RemainLength: 0}
err = d.FixHeader.Pack(w)
if err != nil {
return err
}
return nil
}
// Unpack read the packet bytes from io.Reader and decodes it into the packet struct.
func (d *Disconnect) Unpack(r io.Reader) error {
if d.FixHeader.RemainLength != 0 {
return ErrInvalRemainLength
}
return nil
}
// NewDisConnectPackets returns a Disconnect instance by the given FixHeader and io.Reader
func NewDisConnectPackets(fh *FixHeader, r io.Reader) (*Disconnect, error) {
if fh.Flags != 0 {
return nil, ErrInvalFlags
}
p := &Disconnect{FixHeader: fh}
err := p.Unpack(r)
if err != nil {
return nil, err
}
return p, nil
}