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server.go
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server.go
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package main
import (
"context"
"errors"
"flag"
"fmt"
"log"
"net"
"os"
"time"
"google.golang.org/grpc"
"github.com/square-melon/thegame/server/go/thegame/pb"
)
var listen string
var terminateIfParentIsNot int
func init() {
flag.StringVar(&listen, "listen", ":50051", "[host]:port to listen to")
flag.IntVar(&terminateIfParentIsNot, "terminate-if-parent-is-not", -1, "auto terminate the server if the parent's pid is not the given value")
}
type server struct {
arena *Arena
spectatorToken string
adminToken string
}
func newServer() *server {
s := &server{
arena: NewArena(),
spectatorToken: os.Getenv("THEGAME_SPECTATOR_TOKEN"),
adminToken: os.Getenv("THEGAME_ADMIN_TOKEN"),
}
if s.adminToken == "" {
log.Println("Environment variable THEGAME_ADMIN_TOKEN is not set or empty," +
" admin command is disabled")
}
return s
}
func (s *server) Game(stream pb.TheGame_GameServer) error {
log.Println("New client connected")
join, err := stream.Recv()
if err != nil {
log.Printf("join initialization failed: %v", err)
return err
}
heroHandle := s.arena.Join(join.Name)
go func() {
updates := heroHandle.UpdateChan()
for gameState := range updates {
err := stream.Send(gameState)
if err != nil {
log.Printf("cannot send gameState to %v: %v", heroHandle, err)
}
}
}()
defer s.arena.Quit(heroHandle)
for {
controls, err := stream.Recv()
if err != nil {
log.Printf("cannot receive controls from %v: %v", heroHandle, err)
return err
}
s.arena.controlChan <- heroHandle.HeroControls(controls)
}
}
func (s *server) View(view *pb.ViewRequest, stream pb.TheGame_ViewServer) error {
if s.spectatorToken != view.Token {
return errors.New("Invalid token")
}
ch := make(chan *pb.GameState, 16)
s.arena.viewChan <- ch
for gs := range ch {
err := stream.Send(gs)
if err != nil {
log.Printf("cannot send gameState to audience: %v", err)
return err
}
}
return nil
}
func (s *server) Admin(ctx context.Context, command *pb.Command) (*pb.CommandResponse, error) {
if s.adminToken == "" {
return nil, errors.New("Admin disabled")
}
if command.Token != s.adminToken {
return nil, errors.New("Invalid token")
}
if command.Resume {
<-s.arena.Command(CommandResume)
} else if command.Pause {
<-s.arena.Command(CommandPause)
} else if command.Tick {
<-s.arena.Command(CommandTick)
} else if command.GameReset {
<-s.arena.Command(CommandReset)
} else if command.WaitForControls {
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
return nil, err
}
case <-s.arena.AllControlsReceived():
}
}
return &pb.CommandResponse{}, nil
}
func main() {
flag.Parse()
lis, err := net.Listen("tcp", listen)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
port := lis.Addr().(*net.TCPAddr).Port
hostname, err := os.Hostname()
if err != nil {
panic(err)
}
log.SetPrefix(fmt.Sprintf("[%s:%d] ", hostname, port))
s := grpc.NewServer()
gs := newServer()
pb.RegisterTheGameServer(s, gs)
log.Println("listening on", listen)
go func() {
for {
var line string
_, err := fmt.Scanln(&line)
if err != nil {
log.Printf("Failed to read line: %v", err)
break
}
switch line {
case "p":
gs.arena.Command(CommandPause)
case "r":
gs.arena.Command(CommandResume)
case "t":
gs.arena.Command(CommandTick)
case "reset":
gs.arena.Command(CommandReset)
default:
log.Printf("Unknown command: %q\n", line)
}
}
}()
if terminateIfParentIsNot >= 0 {
go func() {
for range time.Tick(time.Second / 2) {
ppid := os.Getppid()
if terminateIfParentIsNot != ppid {
log.Printf(
"Terminating due to --terminate-if-parent-is-not=%v (current ppid: %v)",
terminateIfParentIsNot, ppid)
s.Stop()
}
}
}()
}
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}