332 lines
7.4 KiB
Go
332 lines
7.4 KiB
Go
package main
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import (
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"fmt"
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"log"
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"sync"
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"time"
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"github.com/bwmarrin/discordgo"
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"layeh.com/gopus"
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"layeh.com/gumble/gumble"
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_ "layeh.com/gumble/opus"
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)
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type fromDiscord struct {
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decoder *gopus.Decoder
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pcm chan []int16
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streaming bool
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}
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type discordUser struct {
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username string
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seen bool
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dm *discordgo.Channel
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}
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var discordMutex sync.Mutex
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var discordMixerMutex sync.Mutex
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var fromDiscordMap = make(map[uint32]fromDiscord)
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var discordUsersMutex sync.Mutex
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var discordUsers = make(map[string]discordUser) // id is the key
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// OnError gets called by dgvoice when an error is encountered.
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// By default logs to STDERR
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var OnError = func(str string, err error) {
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prefix := "dgVoice: " + str
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if err != nil {
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log.Println(prefix + ": " + err.Error())
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} else {
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log.Println(prefix)
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}
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}
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// SendPCM will receive on the provied channel encode
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// received PCM data into Opus then send that to Discordgo
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func discordSendPCM(v *discordgo.VoiceConnection, pcm <-chan []int16, die chan bool) {
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const channels int = 1
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const frameRate int = 48000 // audio sampling rate
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const frameSize int = 960 // uint16 size of each audio frame
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const maxBytes int = (frameSize * 2) * 2 // max size of opus data
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streaming := false
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opusEncoder, err := gopus.NewEncoder(frameRate, channels, gopus.Audio)
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if err != nil {
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OnError("NewEncoder Error", err)
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panic(err)
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}
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ticker := time.NewTicker(20 * time.Millisecond)
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lastReady := true
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var readyTimeout *time.Timer
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for {
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<-ticker.C
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if len(pcm) > 1 {
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if !streaming {
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v.Speaking(true)
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streaming = true
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}
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r1 := <-pcm
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r2 := <-pcm
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// try encoding pcm frame with Opus
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opus, err := opusEncoder.Encode(append(r1, r2...), frameSize, maxBytes)
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if err != nil {
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OnError("Encoding Error", err)
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continue
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}
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if v.Ready == false || v.OpusSend == nil {
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if lastReady == true {
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OnError(fmt.Sprintf("Discordgo not ready for opus packets. %+v : %+v", v.Ready, v.OpusSend), nil)
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readyTimeout = time.AfterFunc(30*time.Second, func() {
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die <- true
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})
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lastReady = false
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}
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continue
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} else if lastReady == false {
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fmt.Println("Discordgo ready to send opus packets")
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lastReady = true
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readyTimeout.Stop()
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}
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v.OpusSend <- opus
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} else {
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if streaming {
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v.Speaking(false)
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streaming = false
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}
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}
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}
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}
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// ReceivePCM will receive on the the Discordgo OpusRecv channel and decode
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// the opus audio into PCM then send it on the provided channel.
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func discordReceivePCM(v *discordgo.VoiceConnection, die chan bool) {
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var err error
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lastReady := true
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var readyTimeout *time.Timer
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for {
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if v.Ready == false || v.OpusRecv == nil {
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if lastReady == true {
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OnError(fmt.Sprintf("Discordgo not to receive opus packets. %+v : %+v", v.Ready, v.OpusSend), nil)
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readyTimeout = time.AfterFunc(30*time.Second, func() {
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die <- true
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})
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lastReady = false
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}
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continue
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} else if lastReady == false {
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fmt.Println("Discordgo ready to receive packets")
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lastReady = true
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readyTimeout.Stop()
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}
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p, ok := <-v.OpusRecv
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if !ok {
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log.Println("Opus not ok")
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continue
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}
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discordMutex.Lock()
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_, ok = fromDiscordMap[p.SSRC]
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discordMutex.Unlock()
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if !ok {
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newStream := fromDiscord{}
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newStream.pcm = make(chan []int16, 100)
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newStream.streaming = false
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newStream.decoder, err = gopus.NewDecoder(48000, 1)
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if err != nil {
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OnError("error creating opus decoder", err)
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continue
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}
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discordMutex.Lock()
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fromDiscordMap[p.SSRC] = newStream
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discordMutex.Unlock()
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}
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discordMutex.Lock()
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p.PCM, err = fromDiscordMap[p.SSRC].decoder.Decode(p.Opus, 960, false)
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discordMutex.Unlock()
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if err != nil {
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OnError("Error decoding opus data", err)
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continue
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}
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if len(p.PCM) != 960 {
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log.Println("Opus size error")
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continue
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}
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discordMutex.Lock()
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select {
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case fromDiscordMap[p.SSRC].pcm <- p.PCM[0:480]:
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default:
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log.Println("fromDiscordMap buffer full. Dropping packet")
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discordMutex.Unlock()
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continue
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}
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select {
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case fromDiscordMap[p.SSRC].pcm <- p.PCM[480:960]:
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default:
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log.Println("fromDiscordMap buffer full. Dropping packet")
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}
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discordMutex.Unlock()
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}
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}
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func fromDiscordMixer(toMumble chan<- gumble.AudioBuffer) {
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ticker := time.NewTicker(10 * time.Millisecond)
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sendAudio := false
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for {
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<-ticker.C
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discordMutex.Lock()
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sendAudio = false
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internalMixerArr := make([][]int16, 0)
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// Work through each channel
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for i := range fromDiscordMap {
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if len(fromDiscordMap[i].pcm) > 0 {
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sendAudio = true
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if fromDiscordMap[i].streaming == false {
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x := fromDiscordMap[i]
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x.streaming = true
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fromDiscordMap[i] = x
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}
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x1 := (<-fromDiscordMap[i].pcm)
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internalMixerArr = append(internalMixerArr, x1)
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} else {
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if fromDiscordMap[i].streaming == true {
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x := fromDiscordMap[i]
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x.streaming = false
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fromDiscordMap[i] = x
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}
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}
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}
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discordMutex.Unlock()
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outBuf := make([]int16, 480)
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for i := 0; i < len(outBuf); i++ {
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for j := 0; j < len(internalMixerArr); j++ {
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outBuf[i] += (internalMixerArr[j])[i]
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}
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}
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if sendAudio {
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select {
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case toMumble <- outBuf:
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default:
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log.Println("toMumble buffer full. Dropping packet")
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}
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}
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}
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}
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// This function acts a filter from the interall discordgo state the local state
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// This function
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func discordMemberWatcher(d *discordgo.Session, m *gumble.Client) {
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ticker := time.NewTicker(250 * time.Millisecond)
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g, err := d.State.Guild(*discordGID)
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if err != nil {
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log.Println("error finding guild")
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panic(err)
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}
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// Watch Discordgo internal state for member changes in the channel
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for {
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<-ticker.C
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discordUsersMutex.Lock()
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// start := time.Now()
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// Set all members to false
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for u := range discordUsers {
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du := discordUsers[u]
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du.seen = false
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discordUsers[u] = du
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}
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// Sync the channel voice states to the local discordUsersMap
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for _, vs := range g.VoiceStates {
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if vs.ChannelID == *discordCID {
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if d.State.User.ID == vs.UserID {
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continue
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}
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if _, ok := discordUsers[vs.UserID]; !ok {
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u, err := d.User(vs.UserID)
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if err != nil {
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log.Println("error looking up username")
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continue
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}
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println("User joined Discord " + u.Username)
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dm, err := d.UserChannelCreate(u.ID)
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if err != nil {
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log.Panicln("Error creating private channel for", u.Username)
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}
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discordUsers[vs.UserID] = discordUser{
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username: u.Username,
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seen: true,
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dm: dm,
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}
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m.Do(func() {
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m.Self.Channel.Send(fmt.Sprintf("%v has joined Discord\n", u.Username), false)
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})
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} else {
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du := discordUsers[vs.UserID]
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du.seen = true
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discordUsers[vs.UserID] = du
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}
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}
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}
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// Remove users that are no longer connected
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for id := range discordUsers {
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if discordUsers[id].seen == false {
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println("User left Discord channel " + discordUsers[id].username)
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m.Do(func() {
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m.Self.Channel.Send(fmt.Sprintf("%v has left Discord channel\n", discordUsers[id].username), false)
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})
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delete(discordUsers, id)
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}
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}
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discordUsersMutex.Unlock()
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// elapsed := time.Since(start)
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// log.Printf("Discord user sync took %s", elapsed)
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}
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}
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func discordSendMessageAll(d *discordgo.Session, msg string) {
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discordUsersMutex.Lock()
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for id := range discordUsers {
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du := discordUsers[id]
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if du.dm != nil {
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log.Println("Sensing msg to ")
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d.ChannelMessageSend(du.dm.ID, msg)
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}
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}
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discordUsersMutex.Unlock()
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}
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