Lamda download file obj from s3

AWS Region is a separate geographic area. Explained in previous section s3 — Resource created out of the session s3. You can also give a name that is different from the object name. If your file is existing as a. Including the sub folders in your s3 Bucket. If you have any issues, you can also comment below to ask a question. Spread the knowledge by sharing : 0 More. Once you have an execution role set up following the guidelines above, we can head over to the AWS Lambda management console to create the function.

Creating a lambda function is relatively straightforward. All we need to do is to navigate to the AWS Lambda management console, click "create function" and give it the execution role that we already created above.

Once the function is created, you will be able to see the control panel for the lambda function that you have just created. Your lambda function doesn't do anything yet, because we didn't write any code.

There's an option to write code directly in the inline editor that AWS provides for us, but that's only possible if your lambda function does not have any external dependencies. Unfortunately, for image resizing, an external library must be installed for pretty much any language you might be working in in Python, our code needs Pillow to work properly. This is where it gets tricky. The lambda function executes in an amazonlinux environment, which most likely is not identical to your local environment.

AWS provides a detailed guideline on how to solve this problem - you have to upload your function as a deployment package. In other words, you need to package your function as a module with all dependencies included and ship it onto AWS Lambda so that it knows exactly what it's working with.

The following is the lambda function that grabs an image from the source bucket, resizes it, then puts the resized image in the destination bucket. With the function written above, we can try to follow guidelines provided by Amazon to deploy our function as a package.

Doing just that, I personally ran into issues with Pillow :. It is difficult to say whether or not you will run into the same issue. For me, it happened, and it didn't go away. After lots of googling, I came to a logical conclusion that it has to do with the amazonlinux environment that my lambda function is running in. The reason why I say a logical conclusion is because I did not get any errors when trying to reproduce the same error in the Python virtual environment that I packaged my function in:.

After gaining confidence in where the general problem lies in, I narrowed down the issue: the problem seemed to be that the module PIL is already installed in the Python version that amazonlinux runs. PIL is shipped with Python by default, which is also the case in my local environment, except I can do:. Learn more about clone URLs. Download ZIP. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below.

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To fix this, built a nat gateway in a public subnet, and use this as the default route for the lambda function or add a VPC Endpoint for S3. Use this VPCE as the next route in the route table for the subnet containing the lambda function. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Downloading files from s3 in Lambda Ask Question. Asked 2 years, 7 months ago.

Active 2 years, 7 months ago. Viewed 7k times. I am trying to download files from s3 in AWS lambda. Lambda is inside a vpc which has a NAT Gateway configured.