Understanding How Stripe Webhook Events Are Signed — Subscribing to Stripe webhook events to be notified when payments are done? After implementing your code, it’s time to make sure it works perfectly by coupling with some test cases. In this article, I’ll be writing about why testing Stripe webhook handlers require special care, and how to test them. …

Memoisation is a common technique applied to reduce unnecessary repeated calculations in programming. This technique is frequently brought up as one of the dynamic programming techniques, and in articles, books aiming to help you get your first developer job. In this article, you’ll: learn what memoisation is take a look…

In “ Concurrent Programming in Python is not what you think it is”, I wrote about the notorious GIL in Python and did a simple experiment on existing concurrency mechanism in Python. Today, I’ll describe another common scenario in concurrent programming, the Producer/Consumer problem, with Python. What is the producer/consumer scenario? Imagine you are at…

In this article, I will first walk you through the distinction between concurrent programming and parallel execution, discuss about Python built-ins concurrent programming mechanisms and the pitfalls of multi-threading in Python. Understanding Concurrent Programming vs Parallel Execution Concurrent programming is not equivalent to parallel execution, despite the fact that these two terms are often being used…

Read it for free at https://melvinkoh.me. While there are plenty of Python libraries available for data manipulation, they can be overkill for simple data transformation. Python standard library comes with functools.reduce() function, one of the most used functions in functional programming, is handy for simple data transformation. …

Originally published at https://melvinkoh.me Your app is running happily on its own without major glitches. What happens when business requirements changed and you are now required to update your database schema? In this article, I’ll be discussing several caveats that demand our attention when making schema changes in an app…

Originally published at https://melvinkoh.me. While there are plenty of Python libraries available for data manipulation, they can be overkill for simple data transformation. Python standard library comes with functools.reduce() function, one of the most used functions in functional programming, is handy for simple data transformation. …

Originally published at https://melvinkoh.me Docker, along with Docker Compose are the most used tools under the DevOps category, according to The State of Developer Ecosystem 2019 survey by JetBrains. Chances are if you’re using Docker/Docker Compose for deployment, you’ll most likely be using them for local development as well. …

Originally published at https://melvinkoh.me For the past few hours, I’ve been working on dockerizing a Nuxt.js server-side rendering app to be deployed to AWS Elastic Container Service (ECS). I hit a stone wall when environment variables are not properly injected on runtime on ECS. In this post, I will walk…