FastAPI & Next.js project: Flight Booking App With DevOps. Day 1 - 100 - Background Workers with Kafka & FastAPI | Flight Booking Engine | Day 61

We fired the event—now we need to catch it. 🎣 In Day 61, we complete our Kafka integration by building the Consumer Engine. This is the code that runs in the background, listening for messages and executing the actual heavy lifting (like sending emails) without slowing down the API. The biggest challenge in FastAPI? Running a blocking Kafka Consumer alongside an asynchronous API. We will solve this using Python Threads and the asyncio event loop bridge. 💡 In this live build: The Consumer Engine: Building a threading.Thread loop to listen for Kafka messages continuously. Sync ↔️ Async Bridge: Using asyncio.run_coroutine_threadsafe to trigger async logic from a sync consumer. Event Handlers: Writing cleaner code by routing topics (e.g., user.events) to specific functions. The "Lifespan" Hook: Automatically starting and stopping the background worker when FastAPI boots up. Full Integration: Wiring up the Booking and Payment events to complete the system. By the end, we will have a fully functional Event-Driven architecture where user actions trigger instant background processes. 📘 Watch the full playlist: 👉 https://www.youtube.com/playlist?list=PLdtwawCR2QjmdfhM-7SzDOVGop373bbgW 📂 GitHub Repo (Public Mirror): 👉 https://github.com/KNehe/aero_bound_ventures-public.git Click to join Discord— https://discord.gg/BSQfs8SY 🔥 Subscribe to master complex backend patterns with FastAPI. #FastAPI #ApacheKafka #BackgroundTasks #PythonThreading #BackendDevelopment #EventDriven