discord bot hello world

discoparty.go

package main

import (
	"os"
	"os/signal"

	"github.com/bwmarrin/discordgo"
	"github.com/rs/zerolog/log"
)

func main() {
	bot, err := discordgo.New("Bot " + os.Getenv("DISCORD_BOT_TOKEN"))
	if err != nil {
		log.Fatal().Err(err).Msg("could not instantiate discord instance")
	}

	commands := []*discordgo.ApplicationCommand{
		{
			Name:        "testing",
			Description: "a test command",
		},
	}

	handlers := map[string]func(session *discordgo.Session, interaction *discordgo.InteractionCreate){
		"testing": func(session *discordgo.Session, interaction *discordgo.InteractionCreate) {
			session.InteractionRespond(interaction.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: "a programmatic response!",
				},
			})
		},
	}

	bot.AddHandler(func(session *discordgo.Session, ready *discordgo.Ready) {
		log.Info().Str("username", session.State.User.Username).Str("discriminator", session.State.User.Discriminator).Msg("logged in")
	})

	bot.AddHandler(func(session *discordgo.Session, interaction *discordgo.InteractionCreate) {
		if handler, ok := handlers[interaction.ApplicationCommandData().Name]; ok {
			handler(session, interaction)
		}
	})

	if err := bot.Open(); err != nil {
		log.Fatal().Err(err).Msg("could not establish session with discord")
	}

	var registeredCommands []*discordgo.ApplicationCommand
	for _, c := range commands {
		cmd, err := bot.ApplicationCommandCreate(bot.State.User.ID, "", c)
		if err != nil {
			log.Fatal().Err(err).Msg("could not create application command")
		}
		registeredCommands = append(registeredCommands, cmd)
	}
	defer bot.Close()

	log.Debug().Str("token", bot.Token).Msg("discord initialized")

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt)
	<-stop

	for _, cmd := range registeredCommands {
		if err := bot.ApplicationCommandDelete(bot.State.User.ID, "", cmd.ID); err != nil {
			log.Fatal().Err(err).Str("command", cmd.Name).Msg("cannot delete application command")
		}
	}
}