go get github.com/bwmarrin/discordgo

package discord

import (
    "github.com/bwmarrin/discordgo"
    "strings"
)

type Bot struct {
    session *discordgo.Session
    token   string
}

func NewBot(token string) *Bot {
    bot := &Bot{
        token:   token,
        session: createSession(token),
    }
    return bot
}

func (bot *Bot) Start() {
    session := bot.session
    if err := session.Open(); err != nil {
        panic(err)
    }
    defer session.Close()
    fmt.Println("Bot running...")
    bot.holdOn()
}

func (bot *Bot) holdOn() {
    c := make(chan os.Signal, 1)
    signal.Notify(c, os.Interrupt)
    <- c
}

func createSession(token string) *discordgo.Session {
    session, err := discordgo.New(token)
    if err != nil {
        panic(err)
    }
    return session
}

func (bot *Bot) Start() {
    session := bot.session
    session.AddHandler(handler) // 添加 EventHandler
    if err := session.Open(); err != nil {
        panic(err)
    }
    defer session.Close()
    fmt.Println("Bot running...")
    bot.holdOn()
}

package discord

import (
    "strings"
    "github.com/bwmarrin/discordgo"
)

func handler(session *discordgo.Session, message *discordgo.MessageCreate) {
	if shouldReply(session.State.User.ID, message) {
		switch {
		case strings.Contains(message.Content, "ping"):
			_, err := session.ChannelMessageSend(message.ChannelID, "pong")
			if err != nil {
				println(err.Error())
			}
		case strings.Contains(message.Content, "pong"):
			_, err := session.ChannelMessageSend(message.ChannelID, "ping")
			if err != nil {
				println(err.Error())
			}
		}
	}
}

// shouldReply 判断是否需要回复
func shouldReply(botId string, message *discordgo.MessageCreate) bool {
	// ignore messages from the bot itself
	if message.Author.ID == botId {
		return false
	}
	// ignore messages that don't mention the bot
	for _, mentionedUser := range message.Mentions {
		if mentionedUser.ID == botId {
			return true
		}
	}
	return false
}

package main

import "dev/hylas/discord-bot/discord"

const token = "${your-token}"

func main() {
    bot := discord.NewBot("Bot " + token)
    bot.Start()
}