NewProductService should return the Service interface, not the private service type #3323
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WalkthroughThe constructor NewProductService in Changes
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Summary of Changes
Hello @kucukaslan, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request refactors the NewProductService function to return a domain.Service interface rather than a concrete, unexported *service type. This modification enhances the API's design by adhering to Go's principle of 'accept interfaces, return structs', resolves an IDE warning about exposing unexported types, and promotes greater flexibility and testability within the codebase.
Highlights
- API Refinement: The
NewProductServicefunction now returns thedomain.Serviceinterface instead of the private*serviceconcrete type, improving the public API. - IDE Warning Resolution: This change directly addresses an IDE warning regarding exported functions returning unexported types, aligning with Go's best practices.
- Improved Abstraction: By returning an interface, the service's implementation details are hidden, promoting better abstraction and easier testing through mock implementations.
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Code Review
This pull request correctly changes the return type of the NewProductService function from the unexported *service struct to the exported domain.Service interface. This is an excellent improvement that aligns with Go best practices for encapsulation and dependency inversion by hiding implementation details from consumers of the service. The change effectively resolves the 'Exported function with the unexported return type' warning. The change is correct and I have no further suggestions for the modified code.
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Actionable comments posted: 0
🧹 Nitpick comments (3)
hexagonal/service/logic.go (3)
9-12: Make the GoDoc comment Go‑idiomatic and precise.Start the sentence with the identifier and end with a period.
-// NewProductService a service struct that attaches to a repository via the Repository interface +// NewProductService returns a domain.Service backed by the provided domain.Repository.
10-12: Add a compile‑time interface assertion.This guards against accidental interface drift when domain.Service changes.
Place near the type declaration:
var _ domain.Service = (*service)(nil)
10-12: Optional: defend against a nil repository (or document the precondition).If productRepo is nil, later calls will panic at runtime when invoking methods on a nil interface value. Either document the requirement or fail fast.
Minimal guard:
func NewProductService(productRepo domain.Repository) domain.Service { + if productRepo == nil { + panic("service: productRepo must not be nil") + } return &service{productRepo: productRepo} }
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📒 Files selected for processing (1)
hexagonal/service/logic.go(1 hunks)
🧰 Additional context used
🧬 Code graph analysis (1)
hexagonal/service/logic.go (1)
clean-architecture/pkg/book/repository.go (1)
Repository(16-21)
🔇 Additional comments (1)
hexagonal/service/logic.go (1)
10-12: Approve: return interface from constructorReturning domain.Service is correct — quick scan found domain.Service (hexagonal/domain/service.go), call sites (hexagonal/main.go) consume the interface, and no references or type assertions to *service were found outside hexagonal/service/logic.go.
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Actionable comments posted: 1
🧹 Nitpick comments (1)
hexagonal/service/logic.go (1)
9-10: Consider guarding against nil repository (or document it)Either document the precondition or add a nil check.
- If documenting only (no code change), update the doc:
-// NewProductService returns a domain.Service backed by the provided domain.Repository. +// NewProductService returns a domain.Service backed by the provided domain.Repository. +// Requires a non-nil productRepo.
- If enforcing, add:
func NewProductService(productRepo domain.Repository) domain.Service { if productRepo == nil { panic("service.NewProductService: productRepo must not be nil") } return &service{productRepo: productRepo} }
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hexagonal/service/logic.go(1 hunks)
🔇 Additional comments (2)
hexagonal/service/logic.go (2)
9-10: Return interface from constructor — LGTMSwitching NewProductService to return domain.Service fixes the “exported function with unexported return type” warning and aligns with Go API design.
9-10: *No external callers require the concrete service type (service) — returning domain.Service is safe.
Search shows NewProductService is only called in hexagonal/main.go and the only uses of the concrete type are the method receivers in hexagonal/service/logic.go.
I noticed this with IDE warning:
Summary by CodeRabbit