"invalid ELF header" when using the nodejs "ref" module on AWS Lambda

Question

I've just uploaded a zip to AWS Lambda which included the "ref" (https://www.npmjs.com/package/ref), which is needed to validate an iOS Game Center authentication token (How to authenticate Game Center User from 3rd party node.js server).

Unfortunately invoking it results in the "invalid ELF header" error,

{
  "errorMessage": "/var/task/node_modules/ref/build/Release/binding.node: invalid ELF header",
  "errorType": "Error",
  "stackTrace": [
    "Module.load (module.js:356:32)",
    "Function.Module._load (module.js:312:12)",
    "Module.require (module.js:364:17)",
    "require (module.js:380:17)",
    "bindings (/var/task/node_modules/ref/node_modules/bindings/bindings.js:76:44)",
    "Object.<anonymous> (/var/task/node_modules/ref/lib/ref.js:5:47)",
    "Module._compile (module.js:456:26)",
    "Object.Module._extensions..js (module.js:474:10)",
    "Module.load (module.js:356:32)",
    "Function.Module._load (module.js:312:12)"
  ]
}

This has been developed on a 64bit Macbook Pro running Yosemite which has no problem running the code locally. Googling around for "invalid ELF header" has yielded little to know relevant results and I'm really not sure where to go from here. Would I be better asking this in a node.js area, or is this the relevant area, because it might be an issue with the platform?

Answer 1

This happens when you build on one architecture and then attempt to use the same built addon on a different architecture (or platform in some cases).

According to this page, addons may have to be compiled against an Amazon Linux image on EC2 in order for the compiled addons to be usable on their Lambda service.

Answer 2

This doesn't apply exactly to your question, but in case anyone stumbles across this when using AWS Elastic Beanstalk, it could be a result of uploading the node_modules/ directory along with everything else, so you need to force it to ignore the file.

.ebignore

node_modules/

Answer 3

For those Developers porting JS to TypeScript on Lambda, ensure ALL dependancies are imported, not required:

import $ from "cheerio";

NOT

const $ = require("cheerio");