Watermill: the missing standard library for event-driven applications
summary
Watermill is a Go library that claims to make event-driven services as simple as HTTP servers and now has ~8k GitHub stars and 100+ contributors. It supports about 12 pub/subs and supports Kafka, RabbitMQ, NATS, Redis, Postgres/MySQL and demonstrates switching from Kafka to Go Cloud live. The code uses generics to implement CQRS, an outbox component for transactional publish from Postgres/MySQL, and a reusable test suite for all pub/sub implementations that caught regressions and enabled confident swaps; a demo cuts handler plumbing roughly threefold.
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chapters (11)
- 0:00Introduction to Watermill
- 1:01The origins of Watermill
- 2:53Problems with event-driven systems
- 4:48Simplifying event-driven design
- 7:24Unix philosophy and architecture
- 10:28Core Watermill components
- 14:23Testing strategy for open source
- 17:45Designing stable public APIs
- 20:51Live coding demonstration
- 39:26Recent features and conclusion
- 40:38Q&A session
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