LocalStack I recently needed to be able to test a lambda function locally. Whilst its possible to do this in AWS, the feedback loop was frustratingly long. To speed this up, I decided to leverage LocalStack. This was a fairly interesting exercise so I thought I would share my notes around getting this set-up in the hope that it helps someone! You can find the example code referenced throughout this guide here....
Say what? A recent work project utilised the power of Amazon’s MemoryDB to build a distributed caching layer (if you wish to find out more about Amazon MemoryDB see here). Under the hood, MemoryDB effectively provides a Redis Cluster running in the cloud. The project in question is written primarily in Java and executes as a series of Lambda functions running within a couple of Step Functions. As part of some improvement work carried out on the project we abstracted any execution of Redis commands into a custom repository layer, built on top of the excellent Lettuce library....
A pyramid scheme Most people may be familiar with the testing pyramid, a concept originally developed by Martin Cohn but popularised by Martin Fowler. For those that are not, it attempts to convey how tests should be distributed within a project - lots of fast, cheap and easy to write unit tests, thinning out (i.e. not duplicated at each layer) as we go further up the pyramid, ultimately to more complex, time consuming and potentially brittle automated GUI tests....