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main.go
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main.go
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package main
import (
crand "crypto/rand"
"encoding/base64"
"encoding/json"
"fmt"
"math/rand"
"net/http"
"strconv"
"sync"
"time"
"github.com/gorilla/websocket"
)
// GameRoom bla
type GameRoom struct {
sync.Mutex
game *GameState
playersIn int
nplayers int
lastActive time.Time
}
// PlayerTokenData bla
type PlayerTokenData struct {
playerIdx int
room string
}
var rooms = map[string]*GameRoom{}
var playerTokens = map[string]PlayerTokenData{}
var globalLock sync.Mutex
func doCleanup() {
globalLock.Lock()
defer globalLock.Unlock()
removed := map[string]struct{}{}
for k, v := range rooms {
if len(v.game.listeners) == 0 && time.Since(v.lastActive) > 1*time.Hour {
removed[k] = struct{}{}
delete(rooms, k)
}
}
for k, v := range playerTokens {
if _, ok := removed[v.room]; ok {
delete(playerTokens, k)
}
}
}
func handleJoinForm(w http.ResponseWriter, r *http.Request) {
room := r.URL.RawQuery
if room == "" {
w.WriteHeader(http.StatusBadRequest)
return
}
w.Write([]byte(`
<html>
<head>
<title>Join Hanabi</title>
</head>
<body>
<form method="POST" action="/hanabi/dojoin">
<label for="name">Name:</label><input type="text" name="name" id="name"/><br/>
<input type="submit" value="Join"/>
<input type="hidden" name="room" id="room" value="` + room + `"/>
</form>
<p> To invite others, use this link: <a href="https://walkintrack.nl/hanabi/join.html?` + room + `">https://walkintrack.nl/hanabi/join.html?` + room + `</a> </p>
</body>
</html>
`))
}
func handleJoin(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if err != nil {
fmt.Println(err)
w.WriteHeader(http.StatusBadRequest)
return
}
name := r.FormValue("name")
room := r.FormValue("room")
if name == "" || room == "" {
w.WriteHeader(http.StatusBadRequest)
return
}
globalLock.Lock()
rm, ok := rooms[room]
globalLock.Unlock()
if !ok {
w.WriteHeader(http.StatusBadRequest)
return
}
rm.Lock()
defer rm.Unlock()
if rm.playersIn >= rm.nplayers {
w.WriteHeader(http.StatusBadRequest)
return
}
tokenData := make([]byte, 16)
_, err = crand.Read(tokenData)
if err != nil {
fmt.Println(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
token := base64.StdEncoding.EncodeToString(tokenData)
rm.game.SetName(rm.playersIn, name)
rm.playersIn = rm.playersIn + 1
globalLock.Lock()
playerTokens[token] = PlayerTokenData{playerIdx: rm.playersIn - 1, room: room}
globalLock.Unlock()
http.SetCookie(w, &http.Cookie{
Name: "token",
Value: token,
MaxAge: 24 * 3600,
Path: "/",
})
w.Header().Add("Location", "/hanabi/play.html")
w.WriteHeader(http.StatusSeeOther)
}
func handleCreate(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if err != nil {
fmt.Println(err)
w.WriteHeader(http.StatusBadRequest)
return
}
players := r.FormValue("players")
nplayers, err := strconv.Atoi(players)
if err != nil {
fmt.Println(err)
w.WriteHeader(http.StatusBadRequest)
return
}
if nplayers < 2 || nplayers > 5 {
fmt.Println(err)
w.WriteHeader(http.StatusBadRequest)
return
}
tokenData := make([]byte, 16)
_, err = crand.Read(tokenData)
if err != nil {
fmt.Println(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
token := base64.StdEncoding.EncodeToString(tokenData)
globalLock.Lock()
rooms[token] = &GameRoom{
game: NewGame(nplayers),
nplayers: nplayers,
playersIn: 0,
lastActive: time.Now(),
}
globalLock.Unlock()
w.Header().Add("Location", "/hanabi/join.html?"+token)
w.WriteHeader(http.StatusSeeOther)
}
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
func handleConnect(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
fmt.Println(err)
return
}
_, tokenb, err := conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
fmt.Printf("error: %v\n", err)
}
return
}
token := string(tokenb)
globalLock.Lock()
playerData, ok := playerTokens[token]
globalLock.Unlock()
if !ok {
conn.Close()
return
}
globalLock.Lock()
rm := rooms[playerData.room]
globalLock.Unlock()
playerIdx := playerData.playerIdx
game := rm.game
eventStream := make(chan interface{}, 100)
end := make(chan struct{})
listener := &GameStateListener{
l: eventStream,
playerIndex: playerIdx,
}
game.AddListener(listener)
// Send events to browser
go func() {
for {
select {
case ev := <-eventStream:
json, err := json.Marshal(ev)
if err != nil {
fmt.Println(err)
continue
}
w, err := conn.NextWriter(websocket.TextMessage)
if err != nil {
fmt.Println(err)
continue
}
w.Write(json)
err = w.Close()
if err != nil {
fmt.Println(err)
continue
}
case <-end:
go func() {
for ok := true; ok; _, ok = <-eventStream {
}
}()
rm.lastActive = time.Now()
game.RemoveListener(listener)
close(eventStream)
return
}
}
}()
go func() {
for {
_, message, err := conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
fmt.Printf("error: %v\n", err)
}
break
}
var baseData ActionBase
err = json.Unmarshal(message, &baseData)
if err != nil {
fmt.Println(err)
continue
}
switch baseData.ActionType {
case ActionTypeHint:
game.DoHint(playerIdx)
case ActionTypeDiscard:
var discardData ActionDiscard
err = json.Unmarshal(message, &discardData)
if err != nil {
fmt.Println(err)
continue
}
game.DoDiscard(playerIdx, discardData.Index)
case ActionTypePlay:
var playData ActionPlay
err = json.Unmarshal(message, &playData)
if err != nil {
fmt.Println(err)
continue
}
game.DoPlay(playerIdx, playData.Index)
case ActionTypeTilt:
var tiltData ActionTilt
err = json.Unmarshal(message, &tiltData)
if err != nil {
fmt.Println(err)
continue
}
game.DoTilt(playerIdx, tiltData.Index, tiltData.Tilt)
case ActionTypeMove:
var moveData ActionMove
err = json.Unmarshal(message, &moveData)
if err != nil {
fmt.Println(err)
continue
}
game.DoMove(playerIdx, moveData.From, moveData.To)
}
}
end <- struct{}{}
}()
}
func main() {
rand.Seed(time.Now().UnixNano())
go func() {
for {
doCleanup()
time.Sleep(5 * time.Minute)
}
}()
http.Handle("/", http.FileServer(http.Dir("./frontend")))
http.HandleFunc("/join.html", handleJoinForm)
http.HandleFunc("/create", handleCreate)
http.HandleFunc("/dojoin", handleJoin)
http.HandleFunc("/connect", handleConnect)
panic(http.ListenAndServe(":8081", nil))
}