forked from bakape/shamichan
/
daemon.go
91 lines (80 loc) · 1.87 KB
/
daemon.go
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// +build linux darwin
// Daemonization logic for the server
package server
import (
"log"
"os"
"syscall"
"time"
"github.com/sevlyar/go-daemon"
)
func init() {
handleDaemon = func(arg string) {
switch arg {
case "debug":
startServer()
case "stop":
killDaemon()
fallthrough
case "init": // For internal use only
os.Exit(0)
case "restart":
killDaemon()
fallthrough
case "start":
daemonise()
default:
printUsage()
}
}
}
// Configuration variables for handling daemons
var daemonContext = &daemon.Context{
PidFileName: ".pid",
LogFileName: "error.log",
}
// Spawn a detached process to work in the background
func daemonise() {
child, err := daemonContext.Reborn()
if err != nil && err.Error() == "resource temporarily unavailable" {
log.Fatalln("Error: Server already running")
}
if child != nil {
return
}
daemonised = true
defer daemonContext.Release()
log.Println("Server started ------------------------------------")
go startServer()
if err := daemon.ServeSignals(); err != nil {
log.Fatalf("daemon runtime error: %s\n", err)
}
log.Println("server terminated")
}
// Terminate the running meguca server daemon
func killDaemon() {
proc := findDaemon()
if proc != nil {
if err := proc.Signal(syscall.SIGTERM); err != nil {
log.Fatalf("error killing running daemon: %s\n", err)
}
// Ascertain process has exited
for {
if err := proc.Signal(syscall.Signal(0)); err != nil {
if err.Error() == "os: process already finished" {
break
}
log.Fatalf("error ascertaining daemon exited: %s\n", err)
}
time.Sleep(100 * time.Millisecond)
}
}
}
// Find the running daemonised meguca server process
func findDaemon() *os.Process {
proc, err := daemonContext.Search()
if err != nil && (!os.IsNotExist(err) && err.Error() != "EOF") {
log.Fatalf("error locating running daemon: %s\n", err)
}
return proc
}