package protocol

type ChildErr interface {
	Parent() error
}

// ClientErr provides a way for NSQ daemons to log a human reabable
// error string and return a machine readable string to the client.
//
// see docs/protocol.md for error codes by command
type ClientErr struct {
	ParentErr error
	Code      string
	Desc      string
}

// Error returns the machine readable form
func (e *ClientErr) Error() string {
	return e.Code + " " + e.Desc
}

// Parent returns the parent error
func (e *ClientErr) Parent() error {
	return e.ParentErr
}

// NewClientErr creates a ClientErr with the supplied human and machine readable strings
func NewClientErr(parent error, code string, description string) *ClientErr {
	return &ClientErr{parent, code, description}
}

type FatalClientErr struct {
	ParentErr error
	Code      string
	Desc      string
}

// Error returns the machine readable form
func (e *FatalClientErr) Error() string {
	return e.Code + " " + e.Desc
}

// Parent returns the parent error
func (e *FatalClientErr) Parent() error {
	return e.ParentErr
}

// NewClientErr creates a ClientErr with the supplied human and machine readable strings
func NewFatalClientErr(parent error, code string, description string) *FatalClientErr {
	return &FatalClientErr{parent, code, description}
}