Wrapping Errors the Right Way

I’ve seen a few examples of error handling like the following lately: func MightFail(id string) error { err := sqlStatement() if err != nil { return fmt.Errorf("mightFail failed with id %v because of sql: %w", id, err } ... return nil }See the problem? It becomes more clear when you start to use the function: func business(ids []string) error { for _, id := range ids { err := MightFail(id) if err

[jagua]

"only include information the caller doesn’t have."

[mattn]

Go のエラーを wrap する際は冗長になり過ぎるので呼び出し元が持っていない情報のみを出力すべきだという話。 #golang