AWS lambda "Unable to import module 'lambda_function" when I uncomment one of my imports

Question

I have an AWS lambda that takes images from an S3 and copies them to an Azure blob storage.

The start of my code looks like this:

    import json
    import boto3
    # from azure.storage.blob import BlockBlobService, PublicAccess
    from pymongo import MongoClient
    import bson
    from urllib.parse import unquote
    from datetime import datetime
    import pytz
    import logging

This code runs fine. When I uncomment the azure storage line to get:

    import json
    import boto3
    from azure.storage.blob import BlockBlobService, PublicAccess
    from pymongo import MongoClient
    import bson
    from urllib.parse import unquote
    from datetime import datetime
    import pytz
    import logging

I now get:

Response:
{
  "errorMessage": "Unable to import module 'lambda_function': libffi-d78936b1.so.6.0.4: cannot open shared object file: No such file or directory",
  "errorType": "Runtime.ImportModuleError"
}

Why does importing an azure library cause the entire lambda_handler to not work? I have successfully included all the other libraries in the AWS Lambda Layer, so it definitely exists. The entire Lambda runs fine when I comment out this line of code, so what's going on?

If there was an issue importing azure.storage.blob, wouldn't it say "Unable to import module azure.storage.blob"?

It does not exists, or may be in other directory. Also check stackoverflow.com/questions/35340921/… — Atul Kumar
– Atul Kumar, Commented May 16, 2019 at 5:20

Arka Mukherjee · Accepted Answer · 2019-05-16 07:33:30Z

2

You get this error due to the library not present in your Lambda Layer. Kindly try reconfiguring your Layer, or alternatively try creating a Deployment Package. Kindly refer to this documentation to learn how to create a Deployment Package for a Lambda function.

As mentioned in the comment by Atul Kumar, you could also have a look at this StackOverflow Question.

answered May 16, 2019 at 7:33

Arka Mukherjee

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1 Comment

A_toaster Over a year ago

Yup, turned out to be a Layer issue. I was just confused as to why it said it couldn't find the entire lambd_handler rather than just the module that was missing!

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