forked from djcas9/envdb
/
daemon.go
100 lines (79 loc) · 1.86 KB
/
daemon.go
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package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/sevlyar/go-daemon"
)
// Daemon wrapper for the daemon.Context struct
type Daemon struct {
d *daemon.Context
}
// Running will check if the daemon is running or not
func (daemon *Daemon) Running() (bool, *os.Process, error) {
d, err := daemon.d.Search()
if err != nil {
return false, d, err
}
if err := d.Signal(syscall.Signal(0)); err != nil {
return false, d, err
}
return true, d, nil
}
// StartServer starts the servers (http/tcp) as a daemon process.
func (daemon *Daemon) StartServer(svr *Server, svrWebPort int) {
if ok, p, _ := daemon.Running(); ok {
fmt.Printf("%s server is already running. PID: %d\n", Name, p.Pid)
return
}
fmt.Printf("Starting %s server in daemon mode\n", Name)
Log.SetLevel(DebugLevel)
d, err := daemon.d.Reborn()
if err != nil {
Log.Fatal(err)
}
if d != nil {
return
}
defer daemon.d.Release()
go func() {
if err := svr.Run(svrWebPort); err != nil {
Log.Error(err)
}
}()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT)
for {
select {
case sig := <-sigChan:
Log.Debug("Go Signal: ", sig)
svr.Shutdown()
os.Exit(0)
}
}
}
// Status will get the current status of the daemon.
func (daemon *Daemon) Status() {
if ok, p, _ := daemon.Running(); ok {
fmt.Printf("%s server is running. PID: %d\n", Name, p.Pid)
} else {
daemon.d.Release()
fmt.Printf("%s server is NOT running.\n", Name)
}
}
// Stop will shutdown and stop the daemon process
func (daemon *Daemon) Stop() {
if ok, p, _ := daemon.Running(); ok {
fmt.Printf("Attempting to shutdown %s server. PID: %d\n", Name, p.Pid)
if err := p.Signal(syscall.Signal(syscall.SIGQUIT)); err != nil {
Log.Fatal(err)
}
} else {
daemon.d.Release()
fmt.Printf("%s server is not running.\n", Name)
}
}