/
main.go
94 lines (72 loc) · 1.91 KB
/
main.go
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package main
import (
"fmt"
"github.com/Montesk/proofofwork/cmd"
"github.com/Montesk/proofofwork/config"
"github.com/Montesk/proofofwork/core/logger"
"github.com/Montesk/proofofwork/router"
"github.com/Montesk/proofofwork/server"
"github.com/Montesk/proofofwork/sessioner"
"math/rand"
"os"
"os/signal"
"syscall"
"time"
)
func main() {
rand.Seed(time.Now().UnixNano())
args := cmd.NewFlagCmd()
log := logger.NewBase(args.LogLevel())
shutdown, stop := make(chan struct{}), make(chan struct{})
ss := sessioner.NewMemory(shutdown)
go gracefulShutdown(ss, shutdown, stop, log)
cfg := config.NewBase(args.Protocol(), fmt.Sprintf(":%d", args.Port()), args.ReadTimeout(), args.POWClients(), args.LogLevel())
err := Run(cfg, ss, shutdown, log)
if err != nil {
log.Fatalf("server run error err: %v", err)
}
<-stop
}
func Run(cfg config.Config, ss sessioner.Sessioner, shutdown chan struct{}, log logger.Logger) error {
srv := server.New(cfg, router.NewControllers(log), ss, shutdown, log)
err := srv.Run()
if err != nil {
return err
}
log.Infof("tcp server start on port %s", cfg.Port())
defer func() {
err := srv.Close()
if err != nil {
log.Fatal(err)
}
}()
log.Infof("listening...")
return srv.Listen()
}
// :WARNING: blocking function
func gracefulShutdown(ss sessioner.Sessioner, shutdown chan struct{}, stop chan struct{}, log logger.Logger) {
defer func() {
log.Infof("bye")
stop <- struct{}{}
}()
sig := make(chan os.Signal)
signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
s := <-sig
log.Infof("received signal %s", s.String())
log.Infof("starting graceful shutdown")
notifyServerShutdown(shutdown)
go ss.Close()
for {
select {
case <-time.After(10 * time.Second):
log.Errorf("graceful shutdown timeout")
return
case <-shutdown:
log.Infof("all clients disconnected")
return
}
}
}
func notifyServerShutdown(shutdown chan struct{}) {
shutdown <- struct{}{}
}