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kerror.go
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kerror.go
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// Package kerror provides tools for handling errors.
package kerror
// ClassOf returns a class of the given error.
func ClassOf(err error) Class {
if err == nil {
return nil
}
if e, ok := err.(interface{ Class() Class }); ok {
return e.Class()
}
return nil
}
// MessageOf returns a message of the given error.
func MessageOf(err error) string {
if err == nil {
return ""
}
if e, ok := err.(interface{ Message() string }); ok {
return e.Message()
}
return err.Error()
}
// Base returns an error on which the given error is based (the last error in a cause chain).
func Base(err error) error {
if err == nil {
return nil
}
if e, ok := err.(interface{ Cause() error }); ok {
if cause := e.Cause(); cause != nil {
return Base(cause)
}
}
return err
}
// Is returns true if the given error (or any of errors that caused it) has the given class.
func Is(err error, class Class) bool {
if err == nil || class == nil {
return false
}
if e, ok := err.(interface{ Class() Class }); ok {
if e.Class() == class {
return true
}
}
if e, ok := err.(interface{ Cause() error }); ok {
if cause := e.Cause(); cause != nil {
return Is(cause, class)
}
}
if errs, ok := err.(MultiError); ok {
for _, e := range errs {
if Is(e, class) {
return true
}
}
}
return false
}
// Join passes given errors through a collector.
func Join(errors ...error) error {
coerr := NewCollector()
coerr.Collect(errors...)
return coerr.Error()
}