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node.go
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node.go
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package data
import (
"encoding/json"
"errors"
"io"
"os"
"github.com/frizinak/homechat/server/channel"
)
type NodeMessage struct {
NS string
ID string
channel.NoClose
}
func (m NodeMessage) Binary(r channel.BinaryWriter) error {
r.WriteString(m.NS, 8)
r.WriteString(m.ID, 8)
return r.Err()
}
func (m NodeMessage) JSON(w io.Writer) error {
return json.NewEncoder(w).Encode(m)
}
func (m NodeMessage) Equal(msg channel.Msg) bool { return m == msg }
func (m NodeMessage) FromBinary(r channel.BinaryReader) (channel.Msg, error) {
return BinaryNodeMessage(r)
}
func (m NodeMessage) FromJSON(r io.Reader) (channel.Msg, io.Reader, error) {
return JSONNodeMessage(r)
}
func BinaryNodeMessage(r channel.BinaryReader) (NodeMessage, error) {
m := NodeMessage{}
m.NS = r.ReadString(8)
m.ID = r.ReadString(8)
return m, r.Err()
}
func JSONNodeMessage(r io.Reader) (NodeMessage, io.Reader, error) {
m := NodeMessage{}
nr, err := channel.JSON(r, &m)
return m, nr, err
}
type SongDataMessage struct {
Available bool
Song Song
Size int64
fp string
r io.ReadCloser
channel.NeverEqual
}
func NewSongDataMessage(song Song, size int64, filepath string) *SongDataMessage {
return &SongDataMessage{Available: true, Song: song, Size: size, fp: filepath}
}
func NewNoSongDataMessage() *SongDataMessage {
return &SongDataMessage{Available: false}
}
func (m *SongDataMessage) Upload() (io.Reader, error) {
if m.r == nil {
f, err := os.Open(m.fp)
if err != nil {
return nil, err
}
m.r = f
}
return m.r, nil
}
func (m *SongDataMessage) Binary(w channel.BinaryWriter) error {
if !m.Available {
w.WriteUint8(0)
return w.Err()
}
f, err := m.Upload()
if err != nil {
return err
}
w.WriteUint8(1)
if err := m.Song.Binary(w); err != nil {
return err
}
w.WriteUint64(uint64(m.Size))
if err := w.Err(); err != nil {
return err
}
conn := w.Writer()
_, err = io.Copy(conn, f)
return err
}
func (m *SongDataMessage) Close() error {
r := m.r
m.r = nil
if r != nil {
return r.Close()
}
return nil
}
func (m *SongDataMessage) FromBinary(r channel.BinaryReader) (channel.Msg, error) {
return BinarySongDataMessage(r)
}
func (m *SongDataMessage) FromJSON(r io.Reader) (channel.Msg, io.Reader, error) {
return JSONSongDataMessage(r)
}
func (m *SongDataMessage) JSON(w io.Writer) error {
return errors.New("can't serialize song data")
}
type NoopCloser struct{ io.Reader }
func (n *NoopCloser) Close() error { return nil }
func BinarySongDataMessage(r channel.BinaryReader) (*SongDataMessage, error) {
m := SongDataMessage{}
m.Available = r.ReadUint8() == 1
if !m.Available {
return &m, r.Err()
}
s, err := BinarySong(r)
if err != nil {
return &m, err
}
m.Song = s
m.Size = int64(r.ReadUint64())
m.r = &NoopCloser{io.LimitReader(r.Reader(), m.Size)}
return &m, r.Err()
}
func JSONSongDataMessage(r io.Reader) (*SongDataMessage, io.Reader, error) {
return &SongDataMessage{}, r, errors.New("can't deserialize song data")
}