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signals.go
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signals.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2021 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package apricot
import (
"context"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"google.golang.org/grpc"
)
func signals(srv *grpc.Server, httpsvr *http.Server) {
// Create channel to receive unix signals
signal_chan := make(chan os.Signal, 1)
//Register channel to receive SIGINT and SIGTERM signals
signal.Notify(signal_chan,
syscall.SIGINT,
syscall.SIGTERM)
// Goroutine executes a blocking receive for signals
go func() {
s := <-signal_chan
log.WithField("signal", s.String()).
Debug("received signal")
srv.Stop()
if err := httpsvr.Shutdown(context.Background()); err != nil {
log.Warn("Error while shutting down http server.")
}
// Mesos calls are async.Sleep for 2s to mark tasks as completed.
time.Sleep(2 * time.Second)
log.WithField("signal", s.String()).
Info("service stopped")
switch s {
case syscall.SIGINT:
os.Exit(130) // 128+2
case syscall.SIGTERM:
os.Exit(143) // 128+15
}
}()
}