April 2021 Summaries

Client-server communication in software development can be managed through synchronous or asynchronous processing, each with distinct characteristics and benefits. Synchronous processing requires the client to wait for a server response before proceeding, leading to blocked execution and resource consumption. In contrast, asynchronous processing allows the client to continue other tasks without waiting for a response, promoting scalability and efficiency by freeing up resources and enhancing responsiveness. Asynchronous processing offers advantages such as better failure tolerance, quick response times, and parallel request execution. However, it necessitates architectural adjustments, such as integrating a message broker or using message queues and publish/subscribe systems to handle requests and responses efficiently. This results in a decoupled system that can be scaled for better performance, with tools like Hookdeck offering solutions for easy implementation of asynchronous processing.

Hookdeck is a platform designed to improve the reliability and efficiency of webhook requests in software projects. It offers features such as logging, request queuing, automatic retries, data visualization, and notification systems. By using Hookdeck, developers can save time and resources that would otherwise be spent on building infrastructure for handling webhooks. The platform is easy to set up and use, with a free tier available for users to get started.

The text describes the development of a rate limiter for outbound webhooks by Hookdeck. The goal was to create a reliable and adjustable queueing system that would allow users to process webhooks asynchronously at a predetermined rate without tampering with their inherent simplicity. To achieve this, they built a configurable "Push" queue per user's individual use case and infrastructure capacity. The architecture includes Rate Limiter Jobs, Delivery Queues and Workers, Short Circuiting, Shutdown and Restart Per Destination, Redundancy and Scaling, Testing and Auditing. They also introduced an essential metric on the attempt called delivery_latency to ensure stability and proper adherence to rate limits. Future enhancements include Smart Delivery and Backlog Alerts.