Unzip An Executable File And Use It Inside Lambda
Instructions
Install Required Imports
npm install adm-zip
Initialize your code by importing required packages
var fs = require("fs").promises;
var AdmZip = require("adm-zip");
var spawnsync = require("child_process").spawnSync;
Now extract the executable file you want to run in lambda
// reading archives
var zip = new AdmZip("./myscript.zip");
zip.extractAllTo(/*target path*/ "/tmp/", /*overwrite*/ true);
IMPORTANT: you can only play with files inside /tmp folder in lambda for all other locations it will give an error
Now after extracting, we will use spawnsync function for running the executable file. In spawnsync function you have to pass the executable file in first argument / it can be any command that you want to execute.
// Giving access to our extracted executable file
var chmodExec = spawnsync("chmod", [
"777",
"/tmp/path_to_your_executable_file",
]);
console.log(String(chmodExec.stdout));
// Run the executable file
var args = ["arg1", "arg2"];
var fileExec = spawnsync("/tmp/path_to_your_executable_file", args);
console.log(String(fileExec.stdout));
Now pay attention to the fact that we are first modifying the access right for our executable file as it might not run directly on lambda
IMPORTANT: Make sure to give access rights to your executable file
Q&A
Question: Why was the executable even zipped in the first place if we had to unzip it?
Answer: Simple! Just for fun! btw I did it for learning purpose, and also it makes the whole package a bit less clumsy in case when you have many files in your executable file’s package. And Yes! I know it increases the over all operation’s time and waste resource.