call python from nodejs on AWS lambda - permission denied

Question

I am able to call my python from nodejs on AWS Lambda using the below function. However, because I need specific python libraries, I created a virutalenv in the env directory. I zipped everything up and pushed to Lambda. But when I try and call python from the virtual directory I get a Permission Denied error.

I attempted to modify the chmod permissions on Lambda before calling python but got Operation Not Permitted. How can I get this to run?

console.log('Loading event');

var exec = require('child_process').exec;

exports.handler = function(event, context) {

    exec('env/bin/python district.py \'' + JSON.stringify(event) +   '\'',  function(error, stdout) {
        var obj = stdout.toString();
        context.done(error, obj);
    });
};

Here's the error:

{
  "errorMessage": "Command failed: /bin/sh: env/bin/python:    Permission denied\n",
  "errorType": "Error",
  "stackTrace": [
    "",
    "ChildProcess.exithandler (child_process.js:658:15)",
    "ChildProcess.emit (events.js:98:17)",
    "maybeClose (child_process.js:766:16)",
    "Process.ChildProcess._handle.onexit (child_process.js:833:5)"
  ]
}

Stefan Stefan · Accepted Answer · 2015-08-17T18:32:04

Try this out:

exec('python district.py "'+ JSON.stringify(event) +'"', function(error, stdout) {
    console.log('Python returned: ' + stdout + '.');
    context.done(error, stdout);
});

Amazon has a tutorial on using Python in Lambda here

call python from nodejs on AWS lambda - permission denied

2 Answers