Extrahieren von Aufruf-Frames mit geringem Overhead mittels runtime.Callers und runtime.CallersFrames

package main
 
import (
	"fmt"
	"runtime"
)
 
type TraceError struct {
	Msg    string
	Frames []runtime.Frame
}
 
func CaptureError(msg string) *TraceError {
	pc := make([]uintptr, 10)
	n := runtime.Callers(2, pc)
	frames := runtime.CallersFrames(pc[:n])
 
	var errFrames []runtime.Frame
	for {
		frame, more := frames.Next()
		errFrames = append(errFrames, frame)
		if !more {
			break
		}
	}
	return &TraceError{Msg: msg, Frames: errFrames}
}
 
func main() {
	err := CaptureError("critical system failure")
	fmt.Printf("Error: %s, Top frame: %s\n", err.Msg, err.Frames[0].Function)
}