Download an already uploaded Lambda function

Question

I created a lambda function in AWS (Python) using \"upload .zip\" I lost those files and I need to make some changes, is there is any way to download that .zip?

Answer 1

You can use shell script available here

Answer 2

Yes!

Navigate over to your lambda function settings and on the top right you will have a button called "Actions". In the drop down menu select "export" and in the popup click "Download deployment package" and the function will download in a .zip file.

Answer 3

Update: Added link to script by sambhaji-sawant. Fixed Typos, improved answer and script based on comments!

You can use aws-cli to download the zip of any lambda.

First you need to get the URL to the lambda zip $ aws lambda get-function --function-name $functionName --query 'Code.Location'

Then you need to use wget/curl to download the zip from the URL. $ wget -O myfunction.zip URL_from_step_1

Additionally you can list all functions on your AWS account using

$ aws lambda list-functions

I made a simple bash script to parallel download all the lambda functions from your AWS account. You can see it here :)

Note: You will need to setup aws-cli before using the above commands (or any aws-cli command) using aws configure

Full guide here

Answer 4

If you want to download all the functions in the given region here is my workaround. I have created a simple node script to download function. Install all the required npm packages and set your AWS CLI to the region you want before running the script.

let download = require('download-file');
let extract = require('extract-zip');
let cmd = require('node-cmd');

let downloadFile = async function (dir, filename, url) {
    let options = {
        directory: dir,
        filename: filename
    }
    return new Promise((success, failure) => {
        download(url, options, function (err) {
            if (err) {
                failure(err)
            } else {
                success('done');
            }
        })
    })
}

let extractZip = async function (source, target) {
    return new Promise((success, failure) => {
        extract(source, { dir: target }, function (err) {
            if (err) {
                failure(err)
            } else {
                success('done');
            }
        })
    })
}

let getAllFunctionList = async function () {
    return new Promise((success, failure) => {
        cmd.get(
            'aws lambda list-functions',
            function (err, data, stderr) {
                if (err || stderr) {
                    failure(err || stderr)
                } else {
                    success(data)
                }
            }
        );
    })
}

let getFunctionDescription = async function (name) {
    return new Promise((success, failure) => {
        cmd.get(
            `aws lambda get-function --function-name ${name}`,
            function (err, data, stderr) {
                if (err || stderr) {
                    failure(err || stderr)
                } else {
                    success(data)
                }
            }
        );
    })
}

let init = async function () {
    try {
        let { Functions: getAllFunctionListResult } = JSON.parse(await getAllFunctionList());
        let getFunctionDescriptionResult, downloadFileResult, extractZipResult;
        getAllFunctionListResult.map(async (f) => {
            var { Code: { Location: getFunctionDescriptionResult } } = JSON.parse(await getFunctionDescription(f.FunctionName));
            downloadFileResult = await downloadFile('./functions', `${f.FunctionName}.zip`, getFunctionDescriptionResult)
            extractZipResult = await extractZip(`./functions/${f.FunctionName}.zip`, `/Users/malhar/Desktop/get-lambda-functions/final/${f.FunctionName}`)
            console.log('done', f.FunctionName);
        })
    } catch (e) {
        console.log('error', e);
    }
}


init()