func RunTCP(t TCPService) {
l, err := net.ListenTCP("tcp", t.Addr())
if err != nil {
log.Error("failed to bind to local address %s", t.Addr())
t.Shutdown()
return
}
defer l.Close()
log.Info("listening for connections on %s", t.Addr())
for {
conn, err := l.AcceptTCP()
if err != nil {
log.Error("failed to accept connection: %v", err)
continue
}
if err := t.SetClientOptions(conn); err != nil {
conn.Close()
continue
}
log.Trace(func() string {
return fmt.Sprintf("%s: client connected to %s", conn.RemoteAddr(), t.Addr())
})
go t.Handle(conn)
}
}
func trapSignals() chan int {
exitChan := make(chan int)
signalChan := make(chan os.Signal, 1)
go func() {
s := <-signalChan
log.Info("received signal %d", s)
exitChan <- 1
}()
signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
return exitChan
}
func main() {
flag.Parse()
cfg, err := LoadConfig(*configPath)
if err != nil {
log.Error("failed to load config: %s", err)
return
}
log.Info("loaded config: %s", cfg)
runtime.GOMAXPROCS(cfg.Cores())
exitChan := trapSignals()
go RunTCP(NewSMTPService(cfg, exitChan))
<-exitChan
}