error.go

package errors

import (
	"fmt"
	"path"
	"strconv"
	"strings"
)

//CustomError implements the following interfaces:
//	error
//	github.com/pkg/errors: Cause
type CustomError struct {
	code    int
	message string
	caller  Caller
	cause   error
}

//implement interface error:
func (err CustomError) Error() string {
	return err.Formatted(FormattingOptions{Causes: false})
}

func Is(e1, e2 error) bool {
	if e1WithIs, ok := e1.(ErrorWithIs); ok {
		return e1WithIs.Is(e2)
	}
	return e1.Error() == e2.Error()
}

//Is() compares the message string of this or any cause to match the specified error message
func (err CustomError) Is(specificError error) bool {
	if err.message == specificError.Error() {
		return true
	}
	if err.cause != nil {
		if causeWithIs, ok := err.cause.(ErrorWithIs); ok {
			return causeWithIs.Is(specificError)
		}
	}
	return false
}

//implement github.com/pkg/errors: Cause
func (err CustomError) Cause() error {
	return err.cause
}

func HTTPCode(err error) int {
	if errWithCode, ok := err.(ErrorWithCause); ok {
		return errWithCode.Code()
	}
	return 0
}

func (err CustomError) Code() int {
	//find http error code - returning the smallest code in the stack of causes (excluding code==0)
	code := err.code
	if err.cause != nil {
		if causeWithCode, ok := err.cause.(ErrorWithCause); ok {
			causeCode := causeWithCode.Code()
			if code == 0 || (causeCode != 0 && causeCode < code) {
				code = causeCode
			}
		}
	}
	return code
}