func (l *Logger) output(traceskip int, err error, t LogType, s string) error {
var stack trace.Stack
if l.isTraceEnabled(t) {
stack = trace.TraceN(traceskip+1, 32)
}
var b bytes.Buffer
fmt.Fprint(&b, t, " ", s)
if len(s) == 0 || s[len(s)-1] != '\n' {
fmt.Fprint(&b, "\n")
}
if err != nil {
fmt.Fprint(&b, "[error]: ", err.Error(), "\n")
if stack := errors.Stack(err); stack != nil {
fmt.Fprint(&b, stack.StringWithIndent(1))
}
}
if len(stack) != 0 {
fmt.Fprint(&b, "[stack]: \n", stack.StringWithIndent(1))
}
s = b.String()
l.mu.Lock()
defer l.mu.Unlock()
return l.log.Output(traceskip+2, s)
}
func Errorf(format string, v ...interface{}) error {
err := fmt.Errorf(format, v...)
if !TraceEnabled {
return err
}
return &TracedError{
Stack: trace.TraceN(1, 32),
Cause: err,
}
}
func Trace(err error) error {
if err == nil || !TraceEnabled {
return err
}
_, ok := err.(*TracedError)
if ok {
return err
}
return &TracedError{
Stack: trace.TraceN(1, 32),
Cause: err,
}
}