Lambda函数中未运行S3 API的getObject回调内部的任何操作 [英] Nothing inside the S3 API's getObject callback is running in Lambda function

问题描述

我遇到了无法从S3读取文件的问题，甚至无法进入S3回调.我正在为lambda使用节点8.10，并且已经验证了一切都在运行，直到尝试进入getObject为止-下面的console.log甚至都不会运行.这里有什么歪斜的地方吗?我已授予对lambda和S3的完全访问权限，所以我认为这不是问题.

I'm having a problem where I can't read my file from S3... or even get inside the S3 callback. I'm using node 8.10 for my lambda, and I've verified everything is running until I try to get inside of getObject -- the console.log below won't even run. Does anything look askew here? I've granted full access to lambda and S3, so I don't think that's the issue.

const AWS = require('aws-sdk')

exports.handler = async (event, context, callback) => {

    const s3options = {
        accessKeyId: process.env.AWS_KEY,
        secretAccessKey: process.env.AWS_SECRET,
        apiVersion: '2006-03-01',
    }   

    const params = {
        Bucket: event.Records[0].s3.bucket.name,
        Key: event.Records[0].s3.object.key,
    }

    const s3 = new AWS.S3(s3options)    

    s3.getObject(params, (err, data) => {
        // callback(null, data.Body.toString('utf-8'))

        console.log('I am here!')
    })

}

推荐答案

如果尝试使用Node v8.x的 async/await 功能，则必须将代码包装到试试/ catch 块并使用promise(我的意思是没有必要包装功能代码，但是您仍然必须在应用程序内部实现try/catch块).

If you trying to use async/await feature of Node v8.x, then you have to wrap your code into try/catch block and use a promise (I mean it's not necessary to wrap your function code, but you still have to implement try/catch block inside your app).

注意:AWS-SDK已经实现，这意味着您没有来实现AWS-SDK方法或使用回调.只需将 .promise()作为尾部添加到您的方法中，然后将 await 关键字作为前缀添加到您尝试调用的方法中即可.

Note: AWS-SDK already promisified, means that you don't have to promisify AWS-SDK methods or use callbacks. Just simple append .promise() to your method as a tail, and add await keyword as a prefix to a method that is you trying to call.

示例:

之前:

s3.getObject(params, (err, data) => {
        // callback(null, data.Body.toString('utf-8'))

之后:

try 
{
    const s3Response = await s3.getObject(params).promise();

    // if succeed 
    // handle response here
}
catch (ex) 
{
    // if failed
    // handle response here (obv: ex object)
    // you can simply use logging
    console.error(ex);
}

然后您的代码必须如下所示:

Then your code has to look like this:

// it's really cool to use ES6 syntax to import modules: import * as AWS from 'aws-sdk';
// btw, you don't have to import AWS-SDK inside the handler file

// const AWS = require('aws-sdk')

exports.handler = async (event) => {

    const s3options = 
    {
        accessKeyId: process.env.AWS_KEY,
        secretAccessKey: process.env.AWS_SECRET,
        apiVersion: '2006-03-01',
        // do not forget include a region (e.g. { region: 'us-west-1' })
    }   

    const params = 
    {
        Bucket: event.Records[0].s3.bucket.name,
        Key: event.Records[0].s3.object.key,
    }

    const s3 = new AWS.S3(s3options)    

    try 
    {
        const s3Response = await s3.getObject(params).promise();

        // if succeed 
        // handle response here
    }
    catch (ex) 
    {
        // if failed
        // handle response here (obv: ex object)
        // you can simply use logging
        console.error(ex);
    }
}

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