golang-design-patterns

Functional options let you configure Go constructors with defaults and validation at creation time. You define option functions that modify internal state, ensuring extensible public APIs without parameter bloat or breaking changes.

Graceful shutdown in Go requires deferring Close immediately after resource acquisition and using context cancellation for long-running processes. The runtime.AddCleanup method is preferred over SetFinalizer for safe lifecycle management.

Context-aware retry in Go uses bounded backoff loops that check context cancellation before each attempt. You wrap external calls with timeouts and ensure retries respect the parent context deadline to prevent cascading failures.

Use streaming iterators in Go when processing large datasets to avoid out-of-memory errors. This pattern processes data in chunks rather than allocating everything in memory, pairing with compile-regex-once and correct string-to-byte conversions for efficiency.

Return errors for expected failure conditions in Go APIs, using early returns to keep flow clear. Reserve panic for truly unrecoverable states, keeping domain logic pure and avoiding init() abuse for explicit initialization.

Yes, these Go patterns target production systems including microservices, covering bounded resource pools, timeout enforcement for external calls, and architecture right-sizing to avoid premature complexity in distributed environments.