Implementing a middleware design pattern in Azure Functions, similar to Clojure's Ring middleware, Pedestal interceptors, or Django's middleware, is a common approach to handle cross-cutting concerns like authentication, logging, input validation, and error handling in a clean and modular way. While Azure Functions doesn't have a built-in middleware framework as robust as Ring or Django, you can implement middleware-like patterns using a combination of Azure Functions features and custom code. Below, I'll outline industry best practices for implementing middleware patterns in Azure Functions, drawing parallels to the Clojure and Django approaches, and referencing available resources.
- Clojure Ring Middleware: In Ring, middleware is a higher-order function that wraps a handler, transforming requests before they reach the handler and/or responses after the handler processes them. Middleware is composed functionally, allowing sequential processing with