error-handling-example

Use errors pkg to handle error in mutiple layered RESTful service

Inpired by https://stackoverflow.com/questions/63306404/overriding-errors-is-not-working-with-custom-errors

method one

method_one.go

Use errors.As in top layer, handle the error created by errors.New in middle layers, as a result, the custom error will be "throw" from bottom layer to top layer

method two

main.go

Implement interface{ Is(error) bool } interface for custom error, and use errors.Is in top layer to determine if the error stack contains custom error

Suggest method two