无法让机器人停留在语音通道中并侦听命令

Question

您好，我正在尝试构建一个discord机器人，它可以在JavaScript中使用AWS Polly执行文本到语音转换。这是我第一次使用JavaScript，我遇到了一些问题。我希望有人有更多的不和谐经验。js/building discord bots/JavaScript代码可以帮助我解决这个问题。

以下是我的全部源代码：

var AWS = require('aws-sdk');
const Discord = require('discord.js'); 
const fs = require('fs');
var auth = require('./auth.json');

var m_currentPlaying = "";
const client = new Discord.Client();
const prefix = '$'; 
const Polly = new AWS.Polly({
    region: 'us-east-1',
    accessKeyId: auth.accessKey,
    secretAccessKey: auth.secret
});

function getTTS(msg, text) {
    var params = {
        OutputFormat: "mp3",
        Text: text,
        TextType: "text", 
        VoiceId: "Brian"
    };

    console.log("processing command:" + text);

    var fileName = 'sounds/' + msg.id + '.mp3';
    Polly.synthesizeSpeech(params, (err, data) => {
        if (err) {
            console.log("Error getting from polly");
            return err;
        }
        if (data.AudioStream instanceof Buffer) {
            fs.writeFile(fileName, data.AudioStream, function (fsErr) {
                if (fsErr) {
                    console.log("Error writing " + fileName);
                    return fsErr;
                } else {
                    console.log(fileName + ' written sucessfully');
                }
            })
        }
    });

    return fileName;
}

function deleteFile(fileName) {
    fs.unlinkSync("./" + fileName, function(err){
        if (err) {
            console.log("failed to delete " + fileName);
            console.log(err);
            return;
        } 
        console.log(fileName + ' successfully deleted');                                     
    });
}

function playSound(msg, fileName) {
    var voiceChannel = msg.member.voice.channel;
    
    voiceChannel.join()
    .then(connection => {
        m_currentPlaying = fileName; 
        const dispatcher = connection.play(fileName);
        dispatcher.on("finish", end => {
            voiceChannel.leave();
            deleteFile(fileName);
            m_currentPlaying = "";
        });
    })  
}

client.on('ready', () => {
    console.log(`Logged in as ${client.user.tag}!`);
});
  
client.on('message', async msg => {
    if(!msg.content.startsWith(prefix) || msg.author.bot) return; 
 
    const args = msg.content.slice(prefix.length).split(/ +/);
    const command = args.shift().toLowerCase();

    if (command === 'tts') {
        if (msg.member.voice.channel) {
            var sentence = args.join(" ");
            try {
                var file = getTTS(msg, sentence);
                console.log(file);
                playSound(msg, file);
            }
            catch(err) {
                msg.reply("There was an error with that command, I'm sorry");
                console.log(err);
                return; 
            }
        }
    }
    else if (command === 'stop') {
        if (msg.member.voice.channel) 
        {
            console.log(m_currentPlaying);
            msg.guild.voice.connection.dispatcher.destroy();
            msg.guild.voice.connection.disconnect();
            deleteFile(m_currentPlaying);
            m_currentPlaying = "";
        }
    }
});

client.login(auth.token);

现在机器人执行以下操作：

• 机器人启动并使用存储在json文件中的令牌连接到不和谐api
• 然后，它会在put to the disonic中等待包含前缀$的命令
• 如果它看到命令“$tts”，它将确保用户处于语音通道中。然后它将使用AWS polly API创建一个mp3文件，其中包含用户在消息中输入的内容。
• 然后它将加入不和谐语音频道并播放mp3文件。播放mp3文件完成后，它将离开语音频道并删除mp3文件，没有问题。
• “$Stop”命令也可以正常工作。它将破坏当前播放mp3的调度程序，断开机器人连接，并删除创建的mp3文件

问题：

• 现在，机器人工作得很好，将加入语音频道，说出tts消息，删除mp3文件。然而，我想要代码做的是我希望机器人加入语音通道，并留在语音通道中，准备接收命令和播放MP3

function playSound(msg, fileName) {
    var voiceChannel = msg.member.voice.channel;
    
    if (!msg.guild.me.voice.channel) {
        voiceChannel.join()
        .then(connection => {
            m_currentPlaying = fileName; 
            const dispatcher = connection.play(fileName);
            dispatcher.on("finish", end => {
                deleteFile(fileName);
                m_currentPlaying = "";
            });
        })
    }
    else { // else already in a voice chat 
        m_currentPlaying = fileName;
        console.log(fileName);
        const dispatcher = msg.guild.voice.connection.play(fileName);
        dispatcher.on("finish", end => {
            deleteFile(fileName);
            m_currentPlaying = "";
        });
    }
   
}

它似乎是在fs之前进入play（）函数。writeFileSync（）被调用，因此该文件还不存在，我真的不知道为什么。我认为这可能是同步与异步的问题，但我在解决这个错误时遇到了麻烦。感谢所有花时间阅读我的代码并提供见解的人

Answer 1

如果有人在谷歌上找到这个，我就知道了。最后，我做了一些关于使用缓冲区和避免同时编写mp3文件的研究。这解决了问题，现在机器人可以在语音通道中等待输入命令。希望这能帮其他人节省一些时间：）

新代码：

function getTTS(msg, text) {
    var params = {
        OutputFormat: "mp3",
        Text: text,
        TextType: "text", 
        VoiceId: "Brian"
    };

    console.log("processing command:" + text);

    Polly.synthesizeSpeech(params, (err, data) => {
        if (err) {
            console.log("Error getting from polly");
            return err;
        }
        if (data.AudioStream instanceof Buffer) {
            playSound(msg, data);
        }
    });
}

function playSound(msg, soundData) {
    var voiceChannel = msg.member.voice.channel;
    
    if (!msg.guild.me.voice.channel) {
        voiceChannel.join()
        .then(connection => {
            var bufferStream = new Stream.PassThrough();
            bufferStream.end(soundData.AudioStream);
            const dispatcher = connection.play(bufferStream);
            dispatcher.on("finish", end => {
                //voiceChannel.leave();
                //deleteFile(fileName);
                console.log("test2");
            });
        })
    } else { // else already in a voice chat 
        var bufferStream = new Stream.PassThrough();
        bufferStream.end(soundData.AudioStream);
        const dispatcher = msg.guild.voice.connection.play(bufferStream);
        dispatcher.on("finish", end => {
            //voiceChannel.leave();
            //deleteFile(fileName);
            console.log("test1");
        });
    }  
}