Add log level change based on signals

Signed-off-by: Arpad Kiss <arpad.a.kiss@est.tech>

pkg/tools/log/logruslogger/levelchange.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2024 OpenInfra Foundation Europe. All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package logruslogger
+
+import (
+	"context"
+	"os"
+	"os/signal"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/networkservicemesh/sdk/pkg/tools/log"
+)
+
+// SetupLevelChangeOnSignal sets the loglevel to the one specified in the map when a signal assotiated to it arrives
+func SetupLevelChangeOnSignal(ctx context.Context, signals map[os.Signal]logrus.Level) {
+	sigChannel := make(chan os.Signal, len(signals))
+	for sig := range signals {
+		signal.Notify(sigChannel, sig)
+	}
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				signal.Stop(sigChannel)
+				close(sigChannel)
+				return
+			case sig := <-sigChannel:
+				lvl := signals[sig]
+				log.FromContext(ctx).Infof("Setting log level to '%s'", lvl.String())
+				logrus.SetLevel(lvl)
+			}
+		}
+	}()
+}