fix: concurrency issue (#56)

* fix: concurrency issue

* test: add test

loggers/logrus/logger.go

@@ -39,9 +39,7 @@ func (l Logger) Trace(msg string) {
 }
 
 func (l *Logger) WithFields(fields map[string]any) core.Logger[*logrus.Entry] {
-	entry := l.logger.WithFields(logrus.Fields(fields))
-	l.logger = entry
-	return l
+	return &Logger{logger: l.logger.WithFields(logrus.Fields(fields))}
 }
 
 func (l Logger) OriginalLogger() *logrus.Entry {

loggers/logrus/logger_test.go

@@ -118,8 +118,9 @@ func TestLogger(t *testing.T) {
 			logger.WithFields(expectedFields).Info("my msg")
 			logger.WithFields(expectedFields).Trace("some other")
 			logger.WithFields(expectedFields).Info("yeah")
+			logger.Info("ok")
 
-			require.Len(t, hook.AllEntries(), 3)
+			require.Len(t, hook.AllEntries(), 4)
 			assertLog(t, hook.AllEntries()[0], expectedLog{
 				Level:   "info",
 				Message: "my msg",
@@ -130,11 +131,16 @@ func TestLogger(t *testing.T) {
 				Message: "some other",
 				Fields:  expectedFields,
 			})
-			assertLog(t, hook.LastEntry(), expectedLog{
+			assertLog(t, hook.AllEntries()[2], expectedLog{
 				Level:   "info",
 				Message: "yeah",
 				Fields:  expectedFields,
 			})
+			assertLog(t, hook.LastEntry(), expectedLog{
+				Level:   "info",
+				Message: "ok",
+				Fields:  map[string]any{},
+			})
 		})
 	})