mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
181 lines
3.3 KiB
Go
181 lines
3.3 KiB
Go
// Package errors is a drop-in replacement for Golang lib 'errors'.
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package errors // import "v2ray.com/core/common/errors"
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import (
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"os"
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"strings"
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"v2ray.com/core/common/log"
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"v2ray.com/core/common/serial"
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)
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type hasInnerError interface {
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// Inner returns the underlying error of this one.
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Inner() error
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}
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type hasSeverity interface {
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Severity() log.Severity
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}
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// Error is an error object with underlying error.
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type Error struct {
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prefix []interface{}
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path []string
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message []interface{}
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inner error
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severity log.Severity
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}
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// Error implements error.Error().
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func (v *Error) Error() string {
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msg := serial.Concat(v.message...)
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if v.inner != nil {
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msg += " > " + v.inner.Error()
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}
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if len(v.path) > 0 {
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msg = strings.Join(v.path, "|") + ": " + msg
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}
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var prefix string
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for _, p := range v.prefix {
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prefix += "[" + serial.ToString(p) + "] "
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}
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return prefix + msg
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}
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// Inner implements hasInnerError.Inner()
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func (v *Error) Inner() error {
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if v.inner == nil {
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return nil
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}
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return v.inner
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}
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func (v *Error) Base(err error) *Error {
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v.inner = err
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return v
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}
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func (v *Error) atSeverity(s log.Severity) *Error {
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v.severity = s
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return v
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}
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func (v *Error) Severity() log.Severity {
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if v.inner == nil {
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return v.severity
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}
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if s, ok := v.inner.(hasSeverity); ok {
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as := s.Severity()
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if as < v.severity {
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return as
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}
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}
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return v.severity
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}
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// AtDebug sets the severity to debug.
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func (v *Error) AtDebug() *Error {
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return v.atSeverity(log.Severity_Debug)
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}
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// AtInfo sets the severity to info.
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func (v *Error) AtInfo() *Error {
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return v.atSeverity(log.Severity_Info)
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}
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// AtWarning sets the severity to warning.
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func (v *Error) AtWarning() *Error {
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return v.atSeverity(log.Severity_Warning)
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}
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// AtError sets the severity to error.
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func (v *Error) AtError() *Error {
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return v.atSeverity(log.Severity_Error)
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}
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// Path sets the path to the location where this error happens.
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func (v *Error) Path(path ...string) *Error {
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v.path = path
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return v
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}
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// String returns the string representation of this error.
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func (v *Error) String() string {
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return v.Error()
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}
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// WriteToLog writes current error into log.
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func (v *Error) WriteToLog(opts ...ExportOption) {
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var holder ExportOptionHolder
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for _, opt := range opts {
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opt(&holder)
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}
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if holder.SessionID > 0 {
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v.prefix = append(v.prefix, holder.SessionID)
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}
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log.Record(&log.GeneralMessage{
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Severity: GetSeverity(v),
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Content: v,
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})
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}
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type ExportOptionHolder struct {
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SessionID uint32
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}
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type ExportOption func(*ExportOptionHolder)
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// New returns a new error object with message formed from given arguments.
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func New(msg ...interface{}) *Error {
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return &Error{
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message: msg,
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severity: log.Severity_Info,
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}
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}
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// Cause returns the root cause of this error.
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func Cause(err error) error {
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if err == nil {
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return nil
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}
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L:
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for {
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switch inner := err.(type) {
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case hasInnerError:
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if inner.Inner() == nil {
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break L
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}
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err = inner.Inner()
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case *os.PathError:
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if inner.Err == nil {
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break L
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}
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err = inner.Err
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case *os.SyscallError:
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if inner.Err == nil {
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break L
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}
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err = inner.Err
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default:
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break L
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}
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}
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return err
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}
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// GetSeverity returns the actual severity of the error, including inner errors.
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func GetSeverity(err error) log.Severity {
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if s, ok := err.(hasSeverity); ok {
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return s.Severity()
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}
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return log.Severity_Info
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}
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