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|
package downloader
import (
"time"
"github.com/bwmarrin/discordgo"
)
type DlMessage int
const (
Clear DlMessage = iota
Pause
Resume
)
type connUpdate int
const (
attach connUpdate = iota
detach
)
type DownloadManager struct {
conn *discordgo.VoiceConnection
session *discordgo.Session
dls chan *Downloader
PlayState chan DlMessage
playStateChan chan DlMessage
proxyStateChan chan DlMessage
connUpdate chan connUpdate
proxyChan chan []byte
}
const proxyBufSize = 512
func NewManager(s *discordgo.Session) *DownloadManager {
dm := &DownloadManager{
session: s,
dls: make(chan *Downloader),
connUpdate: make(chan connUpdate, 1),
PlayState: make(chan DlMessage),
playStateChan: make(chan DlMessage),
proxyStateChan: make(chan DlMessage),
proxyChan: make(chan []byte, proxyBufSize),
}
go dm.teeStateMessages()
go dm.proxyOpusPackets()
go dm.playFromQueue()
return dm
}
func (m *DownloadManager) teeStateMessages() {
for msg := range m.PlayState {
m.playStateChan <- msg
m.proxyStateChan <- msg
}
}
func (m *DownloadManager) proxyOpusPackets() {
attachState := detach
playState := Resume
clear := false
loop:
for {
if playState == Pause {
select {
case playState = <-m.proxyStateChan:
continue loop
}
}
select { // first check if we have a state update message coming in
case playState = <-m.proxyStateChan:
continue loop
default:
}
// if we're clearing, empty
if clear {
for {
select {
case <-m.proxyChan:
case playState = <-m.proxyStateChan:
continue loop
default:
}
}
}
select {
case upd := <-m.connUpdate:
attachState = upd
default:
}
if attachState == attach {
select {
case upd := <-m.connUpdate:
attachState = upd
case m.conn.OpusSend <- <-m.proxyChan:
}
} else {
select {
case upd := <-m.connUpdate:
attachState = upd
}
}
}
}
func (m *DownloadManager) playFromQueue() {
loop:
for {
select {
case dl := <-m.dls:
dl.SendOn(m.proxyChan)
select {
case <-dl.done:
continue loop
case upd:=<-m.playStateChan:
}
}
}
}
func (m *DownloadManager) Enqueue(url string, startTime, endTime time.Duration) error {
dl, err := NewDownload(url, startTime, endTime)
if err != nil {
return err
}
m.dls <- dl
return nil
}
|
