fix(portforward): rework run loop and fix deadlocks (#1874)

internal/portforward/service/stop.go

@@ -0,0 +1,47 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"os"
+)
+
+func (s *Service) Stop() (err error) {
+	s.startStopMutex.Lock()
+	defer s.startStopMutex.Unlock()
+
+	s.portMutex.RLock()
+	serviceNotRunning := s.port == 0
+	s.portMutex.RUnlock()
+	if serviceNotRunning {
+		return nil
+	}
+
+	s.logger.Info("stopping")
+
+	s.keepPortCancel()
+	<-s.keepPortDoneCh
+
+	return s.cleanup()
+}
+
+func (s *Service) cleanup() (err error) {
+	s.portMutex.Lock()
+	defer s.portMutex.Unlock()
+
+	err = s.portAllower.RemoveAllowedPort(context.Background(), s.port)
+	if err != nil {
+		return fmt.Errorf("blocking previous port in firewall: %w", err)
+	}
+
+	s.port = 0
+
+	filepath := *s.settings.UserSettings.Filepath
+	s.logger.Info("removing port file " + filepath)
+	err = os.Remove(filepath)
+	if err != nil {
+		return fmt.Errorf("removing port file: %w", err)
+	}
+
+	return nil
+}