Add human-readbale log output (#681)

Add human-readable log output. It prints out the exact source code line information.

formatter/hook.go

@@ -0,0 +1,61 @@
+package formatter
+
+import (
+	"fmt"
+	"path"
+	"runtime/debug"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+)
+
+// ContextHook is a custom hook for add the source information for the entry
+type ContextHook struct {
+	goModuleName string
+}
+
+// NewContextHook instantiate a new context hook
+func NewContextHook() *ContextHook {
+	hook := &ContextHook{}
+	hook.goModuleName = hook.moduleName() + "/"
+	return hook
+}
+
+// Levels set the supported levels for this hook
+func (hook ContextHook) Levels() []logrus.Level {
+	return logrus.AllLevels
+}
+
+// Fire extend with the source information the entry.Data
+func (hook ContextHook) Fire(entry *logrus.Entry) error {
+	src := hook.parseSrc(entry.Caller.File)
+	entry.Data["source"] = fmt.Sprintf("%s:%v", src, entry.Caller.Line)
+	return nil
+}
+
+func (hook ContextHook) moduleName() string {
+	info, ok := debug.ReadBuildInfo()
+	if ok && info.Main.Path != "" {
+		return info.Main.Path
+	}
+
+	return "netbird"
+}
+
+func (hook ContextHook) parseSrc(filePath string) string {
+	netbirdPath := strings.SplitAfter(filePath, hook.goModuleName)
+	if len(netbirdPath) > 1 {
+		return netbirdPath[len(netbirdPath)-1]
+	}
+
+	// in case of forked repo
+	netbirdPath = strings.SplitAfter(filePath, "netbird/")
+	if len(netbirdPath) > 1 {
+		return netbirdPath[len(netbirdPath)-1]
+	}
+
+	// in case if log entry is come from external pkg
+	_, pkg := path.Split(path.Dir(filePath))
+	file := path.Base(filePath)
+	return fmt.Sprintf("%s/%s", pkg, file)
+}