dndmusicbot/bot.go

package main

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/bwmarrin/discordgo"
	"github.com/faiface/beep"
	"github.com/fhs/gompd/v2/mpd"
	"github.com/gohugoio/hugo/cache/filecache"
	"github.com/jackc/pgx/v5"
	"github.com/julienschmidt/httprouter"
	"github.com/kataras/go-events"
	"github.com/spf13/afero"
	"github.com/spf13/viper"
	"google.golang.org/api/youtube/v3"
)

const (
	channels   int = 2                   // 1 for mono, 2 for stereo
	sampleRate int = 48000               // audio sampling rate
	frameSize  int = 960                 // uint16 size of each audio frame
	maxBytes   int = (frameSize * 2) * 2 // max size of opus data
)

var (
	app    = new(App)
	config = viper.GetViper()
)

func init() {
	log.SetFlags(log.Ltime | log.Lshortfile)

	log.Println("bot.go loading..")
	config.SetConfigName("config")
	config.SetConfigType("yaml")
	config.AddConfigPath(".")
	err := config.ReadInConfig()
	if err != nil {
		log.Fatal(err)
	}
	log.Println("bot.go done.")
}

type App struct {
	discord  *discordgo.Session
	voice    *discordgo.VoiceConnection
	youtube  *youtube.Service
	queue    *Queue
	ambiance beep.Mixer
	curamb   string
	events   events.EventEmmiter
	next     bool
	db       *pgx.Conn
	router   *httprouter.Router
	active   []string
	plidx    int
	cache    *filecache.Cache
	mpdc     context.CancelFunc
	mpdw     *mpd.Watcher
	mpd      *mpd.Client
}

func main() {
	bfs := afero.NewBasePathFs(afero.NewOsFs(), "cache")
	app.cache = filecache.NewCache(bfs, 1*time.Hour, "")

	ticker := time.NewTicker(300 * time.Millisecond)

	sc := make(chan os.Signal, 1)
	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)

	for {
		select {
		case <-sc:
			app.db.Close(context.Background())
			app.mpdw.Close()
			app.mpdc()
			app.voice.Close()
			app.discord.Close()
			return
		case <-ticker.C:
			app.events.Emit("tick")
		}
	}
}