Discord bot在添加大量角色时遇到问题。。。抱怨事件侦听器

Question

我有一个discord机器人，可以更新我们discord的排行榜频道。每次在数据库中记录游戏时，机器人都会获得排行榜数据，然后对于遇到的每个memberId，它会移除所有技能徽章（技能越高，徽章越有声望），然后根据当前技能添加正确的徽章。出于某种原因，连续添加大量成员角色会导致bot只能通过前100名中的大约15名成员。我对js很陌生，但我认为每个addRole命令都会触发GuildMemberUpdate事件，这太难处理了。这是我收到的警告信息。接下来是大量添加角色超时错误（我将包括一个）。

(node:612) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 guildMemberUpdate listeners added. Use emitter.setMaxListeners() to increase limit
    at _addListener (events.js:280:19)
    at Client.addListener (events.js:297:10)
    at Promise (/home/ubuntu/bots/node_modules/discord.js/src/client/rest/RESTMethods.js:511:19)
    at new Promise (<anonymous>)
    at RESTMethods.addMemberRole (/home/ubuntu/bots/node_modules/discord.js/src/client/rest/RESTMethods.js:501:12)
    at GuildMember.addRole (/home/ubuntu/bots/node_modules/discord.js/src/structures/GuildMember.js:453:37)
    at C6Leaderboard.applyTags (/home/ubuntu/bots/modules/leaderboard.js:139:17)
    at C6Leaderboard.createLeaderboard (/home/ubuntu/bots/modules/leaderboard.js:110:18)
    at C6Leaderboard.publishLeaderboard (/home/ubuntu/bots/modules/leaderboard.js:67:29)
    at <anonymous>
Error: Adding the role timed out.
    at timeout.client.setTimeout (/home/ubuntu/bots/node_modules/discord.js/src/client/rest/RESTMethods.js:514:16)
    at Timeout.setTimeout [as _onTimeout] (/home/ubuntu/bots/node_modules/discord.js/src/client/Client.js:433:7)
    at ontimeout (timers.js:475:11)
    at tryOnTimeout (timers.js:310:5)
    at Timer.listOnTimeout (timers.js:270:5)

以下是我的模块代码的要点：

class C6Leaderboard
{
    constructor() {
        util.client.on('ready', () =>
        {
            guild = util.client.guilds.get("291751672106188800");
            this.generate(); //generate an up to date leaderboard
        });
    }

    async generate()
    {
        try
        {
            // Grab data
            this.leaderboard = await util.makeRGRequest('leaderboard.php', {});

            // Publish new Leaderboard
            this.publishLeaderboard();
        }
        catch(err)
        {
            console.log('[leaderboard_err]' + err);
        }
    }

    async publishLeaderboard()
    {
        const channel = util.getChannel(483346000233365526);
        const msg = await channel.fetchMessage(channel.lastMessageID());
        const content_new = this.createLeaderboard();

        if( msg.content != content_new) msg.edit( content_new );
    }

    createLeaderboard(i, max_top)
    {
        //loop through leaderboard data
            //print line of leaderboard message
            this.applyTags(this.leaderboard[i].id, this.leaderboard[i].skill);
    }

    async applytags(id, skill)
    {
         if (!guild)
            return;
        let mem = guild.members.get(id);
        if (!mem)
            return;
        mem.removeRoles(difficulties);
        if (skill < 1500)
            mem.addRole(settler).catch(console.error);
        else if (skill >= 1500 && skill < 1600)
            mem.addRole(chieftain).catch(console.error);
        else if (skill >= 1600 && skill < 1700)
            mem.addRole(warlord).catch(console.error);
        else if (skill >= 1700 && skill < 1800)
            mem.addRole(prince).catch(console.error);
        else if (skill >= 1800 && skill < 1900)
            mem.addRole(king).catch(console.error);
        else if (skill >= 1900 && skill < 2000)
            mem.addRole(emperor).catch(console.error);
        else if (skill >= 2000 && skill < 2100)
            mem.addRole(immortal).catch(console.error);
        else if (skill >= 2100)
            mem.addRole(deity).catch(console.error);
    }
}

Answer 1

返回promise的方法需要使用wait调用，不能嵌套。

async function applytags(id, skill)
{
     if (!guild)
        return;
    let mem = await guild.members.get(id);
    if (!mem)
        return;
    await mem.removeRoles(difficulties);
    if (skill < 1500)
        await mem.addRole(settler).catch(console.error);
    else if (skill >= 1500 && skill < 1600)
        await mem.addRole(chieftain).catch(console.error);
    else if (skill >= 1600 && skill < 1700)
        await mem.addRole(warlord).catch(console.error);
    else if (skill >= 1700 && skill < 1800)
        await mem.addRole(prince).catch(console.error);
    else if (skill >= 1800 && skill < 1900)
        await mem.addRole(king).catch(console.error);
    else if (skill >= 1900 && skill < 2000)
        await mem.addRole(emperor).catch(console.error);
    else if (skill >= 2000 && skill < 2100)
        await mem.addRole(immortal).catch(console.error);
    else if (skill >= 2100)
        await mem.addRole(deity).catch(console.error);
}

1. https://anidiots.guide/other-guides/async-await
2. https://hackernoon.com/javascript-promises-and-why-async-await-wins-the-battle-4fc9d15d509f
3. https://medium.com/@tkssharma/写入-整洁-异步-节点-js-代码-与-promise-异步-等待-fa8d8b0bcd7c
4. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
5. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function