等待AWS SNS发布回调将值返回给调用方法 [英] Wait for AWS SNS publish callback to return a value to calling method

问题描述

当用户请求重设密码时，我正在尝试发送短信.我想等待消息发送成功，以提醒用户.我目前正在尝试按以下方式进行操作:

I am attempting to send a text message when a user requests to reset their password. I would like to wait for the message to be sent to alert the user if it was successful or not. I am currently attempting to do it as follows:

async function sendResetPasswordTextMessage(req, res) {
    let result = {};

    let phoneNumber = req.body.phoneNumber;                

    if (phoneNumber === undefined) {                       
        return sendInvalidParametersMessage(res);          
    }                                                      

    phoneNumber = phoneNumber.toString();                  

    const userProfile = await models.UserProfile.findOne({ 
        where: {                                           
            phoneNumber: phoneNumber                       
        }                                                  
    });                                                    
    ************************** RELEVANT CODE TO ISSUE *************************
    if (userProfile) {
        const message = "Your username is:\n" + userProfile.username;
        const sent = await AWSSNSClient.sendMessage(message, phoneNumber);

        if (!sent) {
            result.error = setTitleAndMessage("Error", "An error occurred");
        } else {
            result.success = setTitleAndMessage("Success", "Message sent"); 
        }
    }
    return res.send(result);
    ***************************************************************************
}

在另一个类AWSSNSClient中，我具有以下sendMessage函数:

In my other class AWSSNSClient, I have the following sendMessage function:

function sendMessage(message, phoneNumber) {
    const params = { 
        Message: message, 
        MessageStructure: "string", 
        PhoneNumber: "+1" + phoneNumber
    };
    let sent = false;
    sns.publish(params, function(err, data) {
        if (err) {
            console.log(err, err.stack); // an error occurred
        }
        else {
            sent = true;
        }
    });

    return sent;
}

我无法弄清楚如何让sendMessage在返回自身之前等待sns.publish返回.我尝试将其设为异步方法并在sns.publish上添加await，但是该函数仍会在将send设置为true之前返回.

I cannot figure out how to make sendMessage wait for sns.publish to return before it returns itself. I have tried making it an async method and adding await on sns.publish, but the function still returns before sent gets set to true.

我知道消息发送没有错误，因为我收到了消息并且没有控制台日志被打印.

I know that the messages are sending without error because I am receiving them and no console logs are printed.

推荐答案

您可以简单地使用回调.像这样修改您的sendMessge

You can simply use callbacks for that. Modify your sendMessge like this

function sendMessage(message, phoneNumber, cb) {
    const params = { 
        Message: message, 
        MessageStructure: "string", 
        PhoneNumber: "+1" + phoneNumber
    };
    sns.publish(params, cb);
}

然后在您的主文件中可以像这样提供 callback

then on your main file you can supply callback like this

if (userProfile) {
  const message = "Your username is:\n" + userProfile.username;
  AWSSNSClient.sendMessage(message, phoneNumber, (err, data) => {
    if (err) {
      result.error = setTitleAndMessage("Error", "An error occurred");
    }
    else {
      result.success = setTitleAndMessage("Success", "Message sent");
    }
    res.send(result);
  });
}

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