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errors.go
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errors.go
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// Package errors is a drop-in replacement for Golang lib 'errors'.
package errors
import (
"strings"
"v2ray.com/core/common/log"
"v2ray.com/core/common/serial"
)
type hasInnerError interface {
// Inner returns the underlying error of this one.
Inner() error
}
type hasSeverity interface {
Severity() log.Severity
}
// Error is an error object with underlying error.
type Error struct {
message []interface{}
inner error
severity log.Severity
path []string
}
// Error implements error.Error().
func (v *Error) Error() string {
msg := serial.Concat(v.message...)
if v.inner != nil {
msg += " > " + v.inner.Error()
}
if len(v.path) > 0 {
msg = strings.Join(v.path, "|") + ": " + msg
}
return msg
}
// Inner implements hasInnerError.Inner()
func (v *Error) Inner() error {
if v.inner == nil {
return nil
}
return v.inner
}
func (v *Error) Base(err error) *Error {
v.inner = err
return v
}
func (v *Error) atSeverity(s log.Severity) *Error {
v.severity = s
return v
}
func (v *Error) Severity() log.Severity {
if v.inner == nil {
return v.severity
}
if s, ok := v.inner.(hasSeverity); ok {
as := s.Severity()
if as < v.severity {
return as
}
}
return v.severity
}
// AtDebug sets the severity to debug.
func (v *Error) AtDebug() *Error {
return v.atSeverity(log.Severity_Debug)
}
// AtInfo sets the severity to info.
func (v *Error) AtInfo() *Error {
return v.atSeverity(log.Severity_Info)
}
// AtWarning sets the severity to warning.
func (v *Error) AtWarning() *Error {
return v.atSeverity(log.Severity_Warning)
}
// AtError sets the severity to error.
func (v *Error) AtError() *Error {
return v.atSeverity(log.Severity_Error)
}
// Path sets the path to the location where this error happens.
func (v *Error) Path(path ...string) *Error {
v.path = path
return v
}
// String returns the string representation of this error.
func (v *Error) String() string {
return v.Error()
}
// WriteToLog writes current error into log.
func (v *Error) WriteToLog() {
log.Record(&log.GeneralMessage{
Severity: GetSeverity(v),
Content: v,
})
}
// New returns a new error object with message formed from given arguments.
func New(msg ...interface{}) *Error {
return &Error{
message: msg,
severity: log.Severity_Info,
}
}
// Cause returns the root cause of this error.
func Cause(err error) error {
if err == nil {
return nil
}
for {
inner, ok := err.(hasInnerError)
if !ok || inner.Inner() == nil {
break
}
err = inner.Inner()
}
return err
}
// GetSeverity returns the actual severity of the error, including inner errors.
func GetSeverity(err error) log.Severity {
if s, ok := err.(hasSeverity); ok {
return s.Severity()
}
return log.Severity_Info
}