Building an Idempotent Email API with River
2025-03-24
This article demonstrates building an idempotent-safe email API using River. Many email services lack APIs guaranteeing idempotency, leading to duplicate or missing emails. By leveraging River's features and combining unique account IDs with idempotency keys, the author achieves idempotent email sending. Even with network errors causing retries, the email is guaranteed to be sent only once. The article details the implementation, covering job argument definition, worker creation, handling duplicate requests, and parameter matching safety. The resulting API is concise, efficient, and production-ready, avoiding many common email sending pitfalls.
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