在Golang中自定义错误结构

Question

The default structure for error messages in golang contains a string but I want to add dynamic response code and the time the error occurred to it. Any suggestions on how to do it?

Answer 1

error in not a struct, is an interface.

type error interface {
    Error() string
}

you can define your own error struct, just implement the Error() string function.

type ErrorA struct {
    // any field you want
}

func (e ErrorA) Error() string {
    // implement this function
}

then ErrorA can be used as error.

ref:
1. https://golang.org/ref/spec#Errors
2. https://golang.org/ref/spec#Interface_types