Lambda から S3 を使う (Node.js)

バケットの一覧

list_buckets.js

'use strict'

const AWS = require('aws-sdk')
var s3 = new AWS.S3()

exports.handler = async (event) => {

console.log("*** start ***")

try {
       var data = await s3.listBuckets().promise()
       console.log(data.Buckets)
    } catch (ee) {
       console.log(ee)
    }

    const response = {
        statusCode: 200,
    }

    return response
}

バケット内のファイルの一覧

list_files.js

// ---------------------------------------------------------------

var AWS = require('aws-sdk')
var s3 = new AWS.S3()

exports.handler = async (event) => {
    console.log("*** start ***")

    const bucket = 'bucket01'
    var params = { Bucket: bucket }

try {
       var s3Objects = await s3.listObjectsV2(params).promise();
       console.log(s3Objects)
    } catch (ee) {
       console.log(ee)
    }

    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    }

    return response
}

// ---------------------------------------------------------------

ファイルの作成

s3_put.js

console.log('Loading function');

const aws = require('aws-sdk');


const s3 = new aws.S3();

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

console.log ("*** start *** ")

    const bucket = 'bucket01'

    const key = 'Hello6.txt'


    var str_data = 'Good Morning\n'
str_data += 'Good Afternoon\n'
str_data += 'Good Evening\n'
str_data += 'Good Night\n'

console.log(str_data)
console.log ("REGION: " + process.env.AWS_REGION)

    const params = {
        Bucket: bucket,
        Key: key,
        Body: str_data,
    }

    try
    {   
   var data = await s3.putObject (params).promise()
   console.log(data)
       console.log("*** s3.putObject ***")

}
catch (error)
        {
        console.log ("*** error *** s3.putObject ***")
        console.log (error)
        }


 console.log ("*** end *** ")  
}