golang-samber-do

Dependency injection in Go using samber/do eliminates manual constructor wiring by registering provider functions returning (T, error) at the composition root, then resolving services via do.Invoke or MustInvoke. This confines container access to startup while business code depends on interfaces.

Managing service lifecycles in Go involves registering services as lazy, eager, transient, or pre-created values using a service container. Scopes provide module separation, while health checks and graceful shutdown manage service availability and termination.

Dependency resolution errors are handled explicitly through provider functions that return (service, error). When using do.Invoke or MustInvoke, dependency failures surface immediately and are handled at the composition root, reducing hidden runtime issues.

Interface resolution for dependency injection is supported by preferring InvokeAs for interfaces, which enables implicit aliasing. This allows business code to depend on abstractions rather than concrete struct implementations, keeping modules decoupled.

A service container with health checks and graceful shutdown is needed when structuring modular Go applications with package grouping and scopes. It ensures managed services terminate cleanly and report operational status during application lifecycle events.

To reduce repetitive MustInvoke calls when resolving dependencies in Go, use struct tag injection. This feature minimizes boilerplate by automatically populating struct fields with registered services, streamlining the dependency resolution process at the composition root.