package serverImpl

import (
	"../example"
	"context"
	"fmt"
	"git.wanpinghui.com/WPH/go_common/wph"
	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"
	"log"
	"net"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

// 服务端方法实现，没有什么不一样，正常实现即可。此示例只是为了看得更清楚，实例化的时候存了一下端口号，返回值中再把它带上

type ExampleServer struct {
	addr string
}

func (s *ExampleServer) DoFormat(ctx context.Context, req *example.Data) (out *example.Data, err error) {
	var ipStr string
	ip, err := wph.PrivateIPv4()
	if nil == err && nil != ip {
		ipStr = ip.String()
	}
	return &example.Data{Text: fmt.Sprintf("%s (from %s%s)", req.Text, ipStr, s.addr)}, nil
}

func StartServer(addr string) {
	lis, err := net.Listen("tcp", addr)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	example.RegisterFormatDataServer(s, &ExampleServer{addr: addr})
	// 注册到reflection，才能用grpcurl客户端测试
	reflection.Register(s)
	log.Printf("serving on %s\n", addr)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

func SignalHandler(httpServer *http.Server) {
	var (
		c chan os.Signal
		s os.Signal
	)
	c = make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
	for {
		s = <-c
		switch s {
		case syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT:
			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
			println("Shutdown http server")
			if err := httpServer.Shutdown(ctx); err != nil {
				println("http server failed to shutdown", err.Error())
			}
			cancel()
			println("Server exited")
			return
		default:
			return
		}
	}
}