How to automatically deploy a jar from s3 to aws lambda?

Question

I want to automatically deploy a jar to aws-lamda whenever there is any change in the version of the jar in s3 bucket.

For example: There is one S3 bucket say lambdadeploytestand a Lamda functionname autoDeployTest. I have stored an object test.jar in lambdadeploytest.

Whenever there is I upload a new version of the object test.jar, test.jar will be automatically deployed to autoDeployTest lambda function.

Answer 1

You can do that with a lambda function ...
At high level the steps are

• create a lambda function that will download the test.jar and use the jar to create / update the autoDeployTest lambda function.

• configure your new lambda function to be triggered when test.jar is modified on S3

• configure the new lambda function with permissions to read your S3 bucket and to deploy code on Lambda.

You can follow this tutorial to create a lambda function that would be triggered by S3 events. This is the Lambda API your lambda function can call to update autodeployTest code.

Pseudo Code would be like this :

read JSON event object to get the bucket name and object name (bucket_name, test.jar)

download a copy of the object (test.jar) to the lambda container 

(do additional check on the jar file if required) 

call Lambda's UpdateFunctionCode to update autoDeployTest function code with the jar.