use controller-runtime signals (#2589)

pkg/utils/signals/signals.go

@@ -1,46 +0,0 @@
-/*
-Copyright 2021 The Fission Authors.
-
-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 signals
-
-import (
-	"context"
-	"os"
-	"os/signal"
-	"syscall"
-
-	"go.uber.org/zap"
-)
-
-var onlyOneSignalHandler = make(chan struct{})
-
-func SetupSignalHandlerWithContext(logger *zap.Logger) context.Context {
-	var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}
-
-	close(onlyOneSignalHandler) // panics when called twice
-
-	ctx, cancel := context.WithCancel(context.Background())
-	c := make(chan os.Signal, 2)
-	signal.Notify(c, shutdownSignals...)
-	go func() {
-		signal := <-c
-		logger.Info("Received signal", zap.String("signal", signal.String()))
-		cancel()
-		<-c
-		panic("multiple signals received")
-	}()
-
-	return ctx
-}