Download an already uploaded Lambda function - amazon-web-services

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

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.
Action button on top-right
A popup from CTA above (Tap "Download deployment package" here)

Answer 2

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 3

You can use shell script available 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()

Answer 5

Here is a bash script that I used, it downloads all the functions in the default region:
download_code () {
local OUTPUT=$1
OUTPUT=`sed -e 's/,$//' -e 's/^"//' -e 's/"$//g' <<<"$OUTPUT"`
url=$(aws lambda get-function --function-name get-marvel-movies-from-opensearch --query 'Code.Location' )
wget $url -O $OUTPUT.zip
}
FUNCTION_LIST=$(aws lambda list-functions --query Functions[*].FunctionName)
for run in $FUNCTION_LIST
do
download_code $run
done
echo "Finished!!!!"

Answer 6

You can find a python script to download all the lambda functions here.
import os
import sys
from urllib.request import urlopen
import zipfile
from io import BytesIO
import boto3
def get_lambda_functions_code_url():
client = boto3.client("lambda")
lambda_functions = [n["FunctionName"] for n in client.list_functions()["Functions"]]
functions_code_url = []
for fn_name in lambda_functions:
fn_code = client.get_function(FunctionName=fn_name)["Code"]
fn_code["FunctionName"] = fn_name
functions_code_url.append(fn_code)
return functions_code_url
def download_lambda_function_code(fn_name, fn_code_link, dir_path):
function_path = os.path.join(dir_path, fn_name)
if not os.path.exists(function_path):
os.mkdir(function_path)
with urlopen(fn_code_link) as lambda_extract:
with zipfile.ZipFile(BytesIO(lambda_extract.read())) as zfile:
zfile.extractall(function_path)
if __name__ == "__main__":
inp = sys.argv[1:]
print("Destination folder {}".format(inp))
if inp and os.path.exists(inp[0]):
dest = os.path.abspath(inp[0])
fc = get_lambda_functions_code_url()
print("There are {} lambda functions".format(len(fc)))
for i, f in enumerate(fc):
print("Downloading Lambda function {} {}".format(i+1, f["FunctionName"]))
download_lambda_function_code(f["FunctionName"], f["Location"], dest)
else:
print("Destination folder doesn't exist")