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server.go
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server.go
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package tcp
import (
"context"
"fmt"
"github.com/ByteStorage/FlyDB/protocol/tcpIF"
"net"
"os"
"os/signal"
"sync"
"syscall"
)
type Config struct {
Address string
}
// ListenAndServeBySignal start tcp server by signal
func ListenAndServeBySignal(cfg *Config, handler tcpIF.Handler) error {
closeChan := make(chan struct{})
// listen system-level signal
signalChan := make(chan os.Signal, 1)
// syscall.SIGHUP: terminal closed
// syscall.SIGINT: ctrl + c
// syscall.SIGTERM: kill
// syscall.SIGQUIT: ctrl + \
signal.Notify(signalChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
// receive signal
// when receive a signal, send a signal to closeChan
// closeChan will close tcp server
go func() {
s := <-signalChan
switch s {
case syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT:
closeChan <- struct{}{}
}
}()
listener, err := net.Listen("tcp", cfg.Address)
if err != nil {
return err
}
fmt.Println("tcp server start listen on: ", cfg.Address)
// start tcp server
ListenAndServe(listener, handler, closeChan)
return nil
}
// ListenAndServe start tcp server
// closeChan is a channel to close tcp server
// when closeChan receive a signal, tcp server will close
func ListenAndServe(listener net.Listener, handler tcpIF.Handler, closeChan <-chan struct{}) {
defer func() {
_ = listener.Close()
_ = handler.Close()
}()
go func() {
// wait for close signal
<-closeChan
fmt.Println("tcp server close but is shutting down...")
_ = listener.Close()
_ = handler.Close()
}()
ctx := context.Background()
var wg sync.WaitGroup
for {
conn, err := listener.Accept()
if err != nil {
break
}
fmt.Println("accept new connection: ", conn.RemoteAddr().String())
wg.Add(1)
go func() {
defer func() {
wg.Done()
}()
handler.Handle(ctx, conn)
}()
}
wg.Wait()
}