AWS Lambda + Python-ldap

I am trying to use python-ldap with AWS Lambda. I downloaded the tarball from : https://pypi.python.org/pypi/python-ldap

and code to use lambda (lambda_function.py)

from ldap_dir.ldap_query.Lib import ldap

and uploaded the zip to Lambda.

where my directory structure is

ldap_dir -> ldap_query -> Lib -> ldap folder
ldap_dir -> lambda_function.py

Am I missing out something?

Solution

python-ldap is built on top of native OpenLDAP libraries. This article - even though unrelated to the python ldap module - describes how to bundle Python packages that have native dependencies.

The outline of this is the following:

Create an Amazon EC2 instance with Amazon Linux
Install compiler packages as well as the OpenLDAP developer package. yum install -y gcc openldap-devel
Create a virtual environment: virtualenv env
Activate the virtual environment: env/bin/activate
Upgrade pip (I am not sure this is necessary, but I got a warning without this): pip install --upgrade pip
Install python-ldap: pip install python-ldap
Create a handler Python script, for example, lambda.py with the following code:

import os
import subprocess

libdir = os.path.join(os.getcwd(), 'local', 'lib')

def handler(event, context):
    command = 'LD_LIBRARY_PATH={} python ldap.py'.format(libdir)
    subprocess.call(command, shell=True)

Implement your LDAP function, in this example ldap.py:

import ldap

print ldap.PORT

Create a zip package, let's say ldap.zip:

zip -9 ~/ldap.zip ldap.py
zip -9 ~/ldap.zip lambda.py
cd env/lib/python2.7/site-packages
zip -r9 ~/ldap.zip *
cd ../../../lib64/python2.7/site-packages
zip -r9 ~/ldap.zip *

Download the zip to your system (or put it into an S3 bucket). Now you can create your Lambda function using lambda.handler as the function name and use the zip file as the code.

I hope this helps.