errors.go

package errors

import "fmt"

type ErrCode uint64

const (
	IOError    ErrCode = 0x00
	LogicError ErrCode = 0x01
)

func errorName(code ErrCode) string {
	switch code {
	case IOError:
		return "IO_ERROR"
	case LogicError:
		return "LOGIC_ERROR"
	default:
		return "UNKNOWN"
	}
}

type CustomErr struct {
	code    ErrCode
	inner   error
	message string
	// Context
}

func (e *CustomErr) Error() string {
	if e.inner != nil {
		return fmt.Sprintf("{\"type\": \"%s\",\"message\": \"%s\", \"inner\": %+v}", errorName(e.code), e.message, e.inner)
	}
	return fmt.Sprintf("{\"type\": \"%s\", \"message\": \"%s\"}", errorName(e.code), e.message)
}

func (e *CustomErr) Is(code ErrCode) bool {
	return e.code == code
}

// Constructors
func err(c ErrCode, i error, m string) error {
	return &CustomErr{code: c, inner: i, message: m}
}

func LogicErr(message string) error {
	return LogicErrWithInner(message, nil)
}

func LogicErrWithInner(message string, inner error) error {
	return err(LogicError, inner, message)
}

func IOErr(message string) error {
	return IOErrWithInner(message, nil)
}

func IOErrWithInner(message string, inner error) error {
	return err(IOError, inner, message)
}