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node.go
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node.go
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/*
* Copyright (C) 2023 Kendall Tauser
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package app
import (
"fmt"
"log"
"os"
"os/signal"
"syscall"
"github.com/fire833/morfic/pkg/node"
)
// Priviledged node operator process main function.
func nodeMain() {
fmt.Printf("starting node control process, initializing signal handler")
sig := make(chan os.Signal, 5)
signal.Notify(sig)
// Begin handler on thread to free up main for gRPC listener.
go nodesignalHandler(sig)
log.Printf("beginning node grpc server")
cert, e := node.CreateServerCert()
if e != nil {
log.Printf("unable to create node server certificate, error: %v", e)
// Kill the process just for now
os.Exit(1)
}
// Start the node gRPC listener.
if e := node.BeginNodeServer(cert); e != nil {
log.Printf("node server exited, error: %v, exiting\n", e.Error())
node.NodeControllerServer.GracefulStop() // Kill the server gracefully and exit.
}
os.Exit(1) // Kill subprocess after shutdown of server.
}
func nodesignalHandler(sig chan os.Signal) error {
for {
signal := <-sig
switch signal {
case syscall.SIGHUP: // Reload configuration, gracefully stop and restart the server.
{
}
case syscall.SIGKILL | syscall.SIGINT: // Hard stop process.
{
node.NodeControllerServer.Stop()
break
}
case syscall.SIGTERM:
{
node.NodeControllerServer.GracefulStop()
break
}
default:
{
continue // Basically just ignore any other signal.
}
}
}
// return nil
}