hack to fix crashes when a user connects to a game twice using the same browser

Reviewed-on: #15

.vscode/launch.json

@@ -1,15 +0,0 @@
-{
-	// Use IntelliSense to learn about possible attributes.
-	// Hover to view descriptions of existing attributes.
-	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-	"version": "0.2.0",
-	"configurations": [
-		{
-			"name": "Launch Package",
-			"type": "go",
-			"request": "launch",
-			"mode": "debug",
-			"program": "${workspaceFolder}/main.go"
-		}
-	]
-}

api/handler/handler.go

@@ -0,0 +1,139 @@
+package handler
+
+import (
+	"mchess_server/api"
+	"mchess_server/chess"
+	"mchess_server/lobbies"
+	"mchess_server/utils"
+	"net/http"
+	"sync"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"go.uber.org/ratelimit"
+)
+
+var mut sync.Mutex
+var limiter = ratelimit.New(10)
+
+func HostGameHandler(c *gin.Context) {
+	limiter.Take()
+
+	player := chess.NewPlayer(uuid.New())
+	u := lobbies.GetUsher()
+
+	mut.Lock()
+	defer mut.Unlock()
+	lobby := u.CreateNewPrivateLobby(player)
+	u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
+
+	passphrase := lobby.Passphrase.String()
+	info := api.PlayerInfo{
+		PlayerID:   &player.Uuid,
+		Passphrase: &passphrase,
+	}
+	c.Header("Access-Control-Allow-Origin", "*")
+	c.IndentedJSON(http.StatusOK, info)
+}
+
+func GetLobbyForPassphraseHandler(c *gin.Context) {
+	limiter.Take()
+
+	reqPassphrase := c.Param("phrase")
+	if reqPassphrase == "" {
+		c.IndentedJSON(http.StatusBadRequest, reqPassphrase)
+		return
+	}
+
+	passPhraseWithSpaces := utils.ConvertToPassphraseWithSpaces(reqPassphrase)
+	lobby := lobbies.GetLobbyRegistry().GetLobbyByPassphrase(passPhraseWithSpaces)
+
+	if lobby == nil {
+		c.IndentedJSON(http.StatusNotFound, reqPassphrase)
+		return
+	}
+
+	passphrase := api.Passphrase{
+		Value: (*string)(&lobby.Passphrase),
+	}
+
+	c.Header("Access-Control-Allow-Origin", "*")
+	c.IndentedJSON(http.StatusOK, passphrase)
+}
+
+func JoinPrivateGame(c *gin.Context) {
+	limiter.Take()
+
+	req := api.PlayerInfo{}
+	err := c.ShouldBindJSON(&req)
+	if err != nil || req.Passphrase == nil || *req.Passphrase == "" {
+		c.IndentedJSON(http.StatusNotFound, req)
+		return
+	}
+
+	u := lobbies.GetUsher()
+
+	if req.PlayerID != nil { //is reconnect
+		lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
+		var found bool
+		if lobby != nil {
+			_, found = lobby.GetPlayerByUUID(*req.PlayerID)
+		}
+		if found {
+			c.Header("Access-Control-Allow-Origin", "*")
+			c.IndentedJSON(
+				http.StatusOK,
+				api.PlayerInfo{
+					PlayerID:   req.PlayerID,
+					Passphrase: req.Passphrase,
+				})
+			return
+		} else {
+			c.IndentedJSON(http.StatusNotFound, req)
+			return
+		}
+	}
+
+	player := chess.NewPlayer(uuid.New())
+
+	mut.Lock()
+	defer mut.Unlock()
+	lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
+	if lobby != nil {
+		u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
+	} else {
+		c.IndentedJSON(http.StatusNotFound, req)
+		return
+	}
+
+	info := api.PlayerInfo{
+		PlayerID:   &player.Uuid,
+		Passphrase: req.Passphrase,
+	}
+	c.Header("Access-Control-Allow-Origin", "*")
+	c.IndentedJSON(http.StatusOK, info)
+}
+
+func JoinGameHandler(c *gin.Context) {
+	limiter.Take()
+
+	passphrase := api.Passphrase{}
+	err := c.ShouldBindJSON(&passphrase)
+	if err != nil {
+		c.IndentedJSON(http.StatusBadRequest, nil)
+		return
+	}
+
+	u := lobbies.GetUsher()
+	lobby := u.FindExistingPrivateLobby(utils.Passphrase(*passphrase.Value))
+	if lobby == nil {
+		c.IndentedJSON(http.StatusNotFound, nil)
+		return
+	}
+
+	lobbyInfo := api.Passphrase{
+		Value: (*string)(&lobby.Passphrase),
+	}
+
+	c.IndentedJSON(http.StatusOK, lobbyInfo)
+}

api/handler/handler_test.go

@@ -0,0 +1,55 @@
+package handler
+
+import (
+	"encoding/json"
+	"mchess_server/api"
+	"mchess_server/utils"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_GetLobbyFromPassphraseHandler(t *testing.T) {
+	var passphraseURLParameter string
+	var receivedPhrase string
+
+	t.Run("host a lobby", func(t *testing.T) {
+		r1 := httptest.NewRecorder()
+		ctx1, e1 := gin.CreateTestContext(r1)
+		e1.GET("/api/hostPrivate", HostGameHandler)
+		hostGameRequest, _ := http.NewRequest("GET", "/api/hostPrivate", nil)
+		ctx1.Request = hostGameRequest
+
+		e1.ServeHTTP(r1, hostGameRequest)
+
+		playerInfo := api.PlayerInfo{}
+		err := json.Unmarshal(r1.Body.Bytes(), &playerInfo)
+		assert.NoError(t, err)
+
+		receivedPhrase = *playerInfo.Passphrase
+
+		passphrase := utils.NewPassphraseFromString(receivedPhrase)
+		passphraseURLParameter = passphrase.AsURLParam()
+	})
+
+	t.Run("see if the lobby can be fetched by using the passphrase", func(t *testing.T) {
+		r2 := httptest.NewRecorder()
+		ctx2, engine := gin.CreateTestContext(r2)
+		engine.GET("/api/getLobbyForPassphrase/:phrase", GetLobbyForPassphraseHandler)
+
+		url := "/api/getLobbyForPassphrase/" + passphraseURLParameter
+		getLobbyRequest, _ := http.NewRequest("GET", url, nil)
+		ctx2.Request = getLobbyRequest
+
+		engine.ServeHTTP(r2, getLobbyRequest)
+
+		passhrase := api.Passphrase{}
+		err := json.Unmarshal(r2.Body.Bytes(), &passhrase)
+		assert.NoError(t, err)
+
+		assert.Equal(t, http.StatusOK, r2.Code)
+	})
+}

api/handler/websocket.go

@@ -0,0 +1,83 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"mchess_server/api"
+	"mchess_server/utils"
+	"net/http"
+
+	"mchess_server/lobbies"
+
+	"github.com/gin-gonic/gin"
+	gorillaws "github.com/gorilla/websocket"
+)
+
+var upgrader = gorillaws.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+func RegisterWebSocketConnection(c *gin.Context) {
+	limiter.Take()
+
+	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	go waitForAndHandlePlayerID(c, conn)
+}
+
+func waitForAndHandlePlayerID(ctx context.Context, conn *gorillaws.Conn) {
+	limiter.Take()
+
+	msgType, msg, err := conn.ReadMessage()
+	if err != nil {
+		errorMessage := fmt.Sprintf("Reading from websocket connection did not work: %s", err)
+		log.Println(errorMessage)
+		conn.Close()
+		return
+	}
+
+	log.Println("read from websocket endpoint: ", msgType, string(msg), err)
+
+	var info api.PlayerInfo
+	err = json.Unmarshal(msg, &info)
+	if err != nil {
+		errorMessage := fmt.Sprintf("Unmarshaling message did not work: %s", err)
+		log.Println(errorMessage)
+		conn.WriteMessage(msgType, []byte(errorMessage))
+		conn.Close()
+		return
+	}
+
+	lobby := lobbies.GetLobbyRegistry().GetLobbyByPassphrase(utils.NewPassphraseFromString(*info.Passphrase))
+	if lobby == nil {
+		conn.WriteMessage(msgType, []byte("lobby not found"))
+		conn.Close()
+		return
+	}
+
+	player, found := lobby.GetPlayerByUUID(*info.PlayerID)
+	if !found {
+		conn.WriteMessage(msgType, []byte("player not found"))
+		conn.Close()
+		return
+	}
+
+	lobby.Game.SetWebsocketConnectionFor(ctx, player, conn)
+
+	log.Println("player after setting connection: ")
+	log.Println("id: ", player.Uuid)
+	log.Println("color: ", player.GetColor())
+	log.Println("Connection: ", player.Conn.ID)
+}
+
+func ConnectWsForGame(c *gin.Context) {
+	limiter.Take()
+
+}

api/move.go

@@ -21,6 +21,7 @@ const (
 	MoveMessage        MessageType = "move"
 	InvalidMoveMessage MessageType = "invalidMove"
 	ColorDetermined    MessageType = "colorDetermined"
+	GameEnded          MessageType = "gameEnded"
 )
 
 func (m WebsocketMessage) IsValid() bool {

api/passphrase.go

@@ -0,0 +1,5 @@
+package api
+
+type Passphrase struct {
+	Value *string `json:"value,omitempty"`
+}

api/player_info.go

@@ -4,6 +4,5 @@ import "github.com/google/uuid"
 
 type PlayerInfo struct {
 	PlayerID   *uuid.UUID `json:"playerID,omitempty"`
-	LobbyID    *uuid.UUID `json:"lobbyID,omitempty"`
 	Passphrase *string    `json:"passphrase,omitempty"`
 }

chess/bishop.go

@@ -9,14 +9,14 @@ type Bishop struct {
 }
 
 func (b Bishop) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
-	return b.GetAllNonBlockedMoves(board, fromSquare)
+	return b.GetAllNonBlockedSquares(board, fromSquare)
 }
 
 func (b Bishop) GetColor() types.ChessColor {
 	return b.Color
 }
 
-func (b Bishop) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (b Bishop) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	return board.GetNonBlockedDiagonals(fromSquare)
 }
 

chess/board.go

@@ -57,7 +57,7 @@ func (b *Board) Init() {
 	b.position[types.Coordinate{Row: 8, Col: 8}] = Rook{Color: types.Black}
 }
 
-func (b *Board) CheckAndPlay(move types.Move) (bool, Violation) {
+func (b *Board) CheckAndPlay(move *types.Move) (bool, Violation) {
 	tempBoard := b.getCopyOfBoard()
 
 	//Check start square of move
@@ -80,13 +80,13 @@ func (b *Board) CheckAndPlay(move types.Move) (bool, Violation) {
 		}
 	}
 
-	wasSpecialMove, err := tempBoard.handleSpecialMove(move)
-	if err != nil {
-		return false, InvalidMove
+	wasSpecialMove, violation := tempBoard.handleSpecialMove(*move)
+	if violation != "" {
+		return false, violation
 	}
 
 	if !wasSpecialMove {
-		allMovesExceptBlocked := pieceAtStartSquare.GetAllNonBlockedMoves(tempBoard, move.StartSquare)
+		allMovesExceptBlocked := pieceAtStartSquare.GetAllNonBlockedSquares(tempBoard, move.StartSquare)
 		legal := lo.Contains(allMovesExceptBlocked, move.EndSquare)
 		if !legal {
 			return false, InvalidMove
@@ -109,7 +109,7 @@ func (b *Board) CheckAndPlay(move types.Move) (bool, Violation) {
 	b.position = tempBoard.position
 	b.history = tempBoard.history
 	b.colorToMove = b.colorToMove.Opposite()
-	b.appendMoveToHistory(move)
+	b.appendMoveToHistory(*move)
 
 	pieceAtStartSquare.AfterMoveAction(b, move.StartSquare)
 
@@ -188,19 +188,82 @@ func (p Position) getCopyOfPosition() Position {
 	return position
 }
 
-func (b *Board) handleSpecialMove(move types.Move) (bool, error) {
+func (b *Board) handleSpecialMove(move types.Move) (bool, Violation) {
 	var was bool
-	var err error
+	var violation Violation
 	var pieceAtStartSquare = b.getPieceAt(move.StartSquare)
 
 	switch piece := pieceAtStartSquare.(type) {
 	case Pawn:
-		was, err = piece.HandlePossiblePromotion(b, move)
+		was, violation = piece.HandlePossiblePromotion(b, move)
 		if !was {
-			was, err = piece.HandleEnPassant(b, move, b.getLastMove())
+			was, violation = piece.HandleEnPassant(b, move, b.getLastMove())
 		}
 	case King:
-		was, err = piece.HandleCastling(b, move)
+		was, violation = piece.HandleCastling(b, move)
 	}
-	return was, err
+	return was, violation
+}
+
+type GameEndedReason string
+
+const (
+	NoReason          GameEndedReason = "noReason"
+	WhiteIsCheckmated GameEndedReason = "whiteIsCheckmated"
+	BlackIsCheckmated GameEndedReason = "blackIsCheckmated"
+	StalemateReason   GameEndedReason = "stalemate"
+)
+
+func (r GameEndedReason) String() string {
+	return string(r)
+}
+
+func (b *Board) HasGameEnded(lastMove types.Move) (bool, GameEndedReason) {
+	checkForColor := lastMove.ColorMoved.Opposite()
+	if checkmate := b.isColorCheckmated(checkForColor); checkmate {
+		switch checkForColor {
+		case types.White:
+			return true, WhiteIsCheckmated
+		case types.Black:
+			return true, BlackIsCheckmated
+		}
+	}
+	if b.isStalemate() {
+		return true, StalemateReason
+	}
+
+	return false, NoReason
+}
+
+func (b *Board) isColorCheckmated(color types.ChessColor) bool {
+	inCheck, _ := b.isKingOfMovingColorInCheck(color)
+	if !inCheck {
+		return false
+	}
+
+	copyOfBoard := b.getCopyOfBoard()
+
+	var movesToCheck []types.Move
+
+	for startSquare, piece := range b.position {
+		if piece.GetColor() == color {
+			for _, endSquare := range piece.GetAllNonBlockedSquares(*b, startSquare) {
+				move := types.Move{StartSquare: startSquare, EndSquare: endSquare}
+				movesToCheck = append(movesToCheck, move)
+			}
+		}
+	}
+
+	for _, move := range movesToCheck {
+		valid, _ := copyOfBoard.CheckAndPlay(&move)
+		if valid {
+			return false
+		}
+	}
+
+	return true
+}
+
+func (b *Board) isStalemate() bool {
+	return false
 }

chess/board_castling_test.go

@@ -0,0 +1,329 @@
+package chess
+
+import (
+	"mchess_server/types"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Board_WhiteCastlesLeft(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 8, Row: 1}] = Rook{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_BlackCastlesRight(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 4, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 8, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 6, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_KingInCheck(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 5, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, violation := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, CastlingWhileKingInCheck, violation)
+}
+
+func Test_Board_WhiteCastlesLeft_QueenCoversKingsSquare(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 3, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 4, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesRight_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 6, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_KingInCheck(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 5, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, violation := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, CastlingWhileKingInCheck, violation)
+}
+
+func Test_Board_BlackCastlesLeft_QueenCoversKingsSquare(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 3, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_NoRook(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight_NoRook(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_NoRook(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	kingSquare := types.Coordinate{Col: 5, Row: 8}
+	kingDestinationSquare := types.Coordinate{Col: 3, Row: 8}
+
+	board.position[kingSquare] = King{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: kingSquare,
+		EndSquare:   kingDestinationSquare,
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, nil, board.getPieceAt(kingDestinationSquare))
+}
+
+func Test_Board_BlackCastlesRight_NoRook(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_fixBugThatPreventsCastling(t *testing.T) {
+	board := newBoard()
+	board.Init()
+
+	//white move
+	valid, violation := board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 2}, EndSquare: types.Coordinate{Col: 5, Row: 3}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//black move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 7}, EndSquare: types.Coordinate{Col: 5, Row: 6}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//white move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 4, Row: 2}, EndSquare: types.Coordinate{Col: 4, Row: 3}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//black move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 6, Row: 7}, EndSquare: types.Coordinate{Col: 6, Row: 6}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//queen moves to check the king
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 4, Row: 1}, EndSquare: types.Coordinate{Col: 8, Row: 5}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+
+	//this moves should be valid but it was not because of a bug
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 8}, EndSquare: types.Coordinate{Col: 5, Row: 7}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+}

chess/board_test.go

@@ -20,7 +20,7 @@ func Test_CheckMove_validPawnMove(t *testing.T) {
 		EndSquare:   types.Coordinate{Col: 1, Row: 3},
 	}
 
-	good, _ := board.CheckAndPlay(move)
+	good, _ := board.CheckAndPlay(&move)
 	assert.True(t, good)
 
 	//we take the pawn
@@ -28,7 +28,7 @@ func Test_CheckMove_validPawnMove(t *testing.T) {
 		StartSquare: types.Coordinate{Col: 2, Row: 4},
 		EndSquare:   types.Coordinate{Col: 1, Row: 3},
 	}
-	good, _ = board.CheckAndPlay(secondMove)
+	good, _ = board.CheckAndPlay(&secondMove)
 	assert.True(t, good)
 }
 
@@ -45,7 +45,7 @@ func Test_CheckMove_enPassant(t *testing.T) {
 		EndSquare:   types.Coordinate{Col: 5, Row: 4},
 	}
 
-	good, reason := board.CheckAndPlay(move)
+	good, reason := board.CheckAndPlay(&move)
 	assert.True(t, good)
 	assert.Empty(t, reason)
 	assert.Equal(t, Pawn{Color: types.White}, board.position[types.Coordinate{Col: 5, Row: 4}])
@@ -54,7 +54,7 @@ func Test_CheckMove_enPassant(t *testing.T) {
 		StartSquare: types.Coordinate{Col: 6, Row: 4},
 		EndSquare:   types.Coordinate{Col: 5, Row: 3},
 	}
-	good, reason = board.CheckAndPlay(newMove)
+	good, reason = board.CheckAndPlay(&newMove)
 	assert.True(t, good)
 	assert.Empty(t, reason)
 	// the black pawn is on its correct square
@@ -77,7 +77,7 @@ func Test_CheckMove_invalidPawnMoves(t *testing.T) {
 			StartSquare: types.Coordinate{Col: 2, Row: 5},
 			EndSquare:   types.Coordinate{Col: 2, Row: 6},
 		}
-		legalMove, _ := board.CheckAndPlay(move)
+		legalMove, _ := board.CheckAndPlay(&move)
 		assert.False(t, legalMove)
 	})
 
@@ -93,7 +93,7 @@ func Test_CheckMove_invalidPawnMoves(t *testing.T) {
 			StartSquare: types.Coordinate{Col: 2, Row: 5},
 			EndSquare:   types.Coordinate{Col: 3, Row: 5},
 		}
-		legal, _ := board.CheckAndPlay(move)
+		legal, _ := board.CheckAndPlay(&move)
 
 		assert.False(t, legal)
 		assert.Equal(t, boardBeforeMove, board)
@@ -102,7 +102,7 @@ func Test_CheckMove_invalidPawnMoves(t *testing.T) {
 			StartSquare: types.Coordinate{Col: 2, Row: 5},
 			EndSquare:   types.Coordinate{Col: 1, Row: 5},
 		}
-		legal, _ = board.CheckAndPlay(move)
+		legal, _ = board.CheckAndPlay(&move)
 
 		assert.False(t, legal)
 		assert.Equal(t, boardBeforeMove, board)
@@ -111,7 +111,7 @@ func Test_CheckMove_invalidPawnMoves(t *testing.T) {
 			StartSquare: types.Coordinate{Col: 2, Row: 5},
 			EndSquare:   types.Coordinate{Col: 6, Row: 5},
 		}
-		legal, _ = board.CheckAndPlay(move)
+		legal, _ = board.CheckAndPlay(&move)
 
 		assert.False(t, legal)
 		assert.Equal(t, boardBeforeMove, board)
@@ -130,7 +130,7 @@ func Test_CheckMove_invalidPawnMoves(t *testing.T) {
 			StartSquare: types.Coordinate{Col: 2, Row: 6},
 			EndSquare:   types.Coordinate{Col: 2, Row: 7},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 
 		assert.False(t, good)
 		assert.Equal(t, boardBeforeMove, board)
@@ -151,7 +151,7 @@ func Test_CheckMove_validPromotion(t *testing.T) {
 		EndSquare:        types.Coordinate{Col: 1, Row: 8},
 		PromotionToPiece: &shortName,
 	}
-	good, reason := board.CheckAndPlay(move)
+	good, reason := board.CheckAndPlay(&move)
 
 	assert.Empty(t, reason)
 	assert.True(t, good)
@@ -179,13 +179,13 @@ func Test_CheckMove_HistoryWorks(t *testing.T) {
 		EndSquare:   types.Coordinate{Col: 1, Row: 4},
 	}
 
-	good, _ := board.CheckAndPlay(firstMove)
+	good, _ := board.CheckAndPlay(&firstMove)
 	assert.True(t, good)
 
-	good, _ = board.CheckAndPlay(secondMove)
+	good, _ = board.CheckAndPlay(&secondMove)
 	assert.True(t, good)
 
-	good, _ = board.CheckAndPlay(thirdMove)
+	good, _ = board.CheckAndPlay(&thirdMove)
 	assert.True(t, good)
 
 	expectedHistory := []types.Move{
@@ -221,13 +221,13 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 7, Row: 8},
 		}
-		good, reason := board.CheckAndPlay(move)
+		good, reason := board.CheckAndPlay(&move)
 		assert.True(t, good)
 		assert.Empty(t, reason)
 
@@ -246,13 +246,13 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 3, Row: 8},
 		}
-		good, reason := board.CheckAndPlay(move)
+		good, reason := board.CheckAndPlay(&move)
 		assert.True(t, good)
 		assert.Empty(t, reason)
 
@@ -272,25 +272,25 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		//Move black
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 8}, EndSquare: types.Coordinate{Col: 4, Row: 8}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 8}, EndSquare: types.Coordinate{Col: 4, Row: 8}})
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 2}, EndSquare: types.Coordinate{Col: 5, Row: 1}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 2}, EndSquare: types.Coordinate{Col: 5, Row: 1}})
 
 		//Move black back
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 4, Row: 8}, EndSquare: types.Coordinate{Col: 5, Row: 8}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 4, Row: 8}, EndSquare: types.Coordinate{Col: 5, Row: 8}})
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 3, Row: 8},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 		assert.False(t, good)
 	})
 
@@ -304,13 +304,13 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 7, Row: 8}] = Bishop{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 7, Row: 8},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 		assert.False(t, good)
 	})
 
@@ -324,13 +324,13 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 4, Row: 8}] = Bishop{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 3, Row: 8},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 		assert.False(t, good)
 	})
 
@@ -344,13 +344,13 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 3, Row: 8}] = Bishop{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 3, Row: 8},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 		assert.False(t, good)
 	})
 
@@ -364,13 +364,88 @@ func Test_Promotion_BlackKing(t *testing.T) {
 		board.position[types.Coordinate{Col: 2, Row: 8}] = Bishop{Color: types.Black}
 
 		//Make dummy move for white
-		board.CheckAndPlay(types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
+		board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 1}, EndSquare: types.Coordinate{Col: 5, Row: 2}})
 
 		move := types.Move{
 			StartSquare: types.Coordinate{Col: 5, Row: 8},
 			EndSquare:   types.Coordinate{Col: 3, Row: 8},
 		}
-		good, _ := board.CheckAndPlay(move)
+		good, _ := board.CheckAndPlay(&move)
 		assert.False(t, good)
 	})
 }
+
+func Test_Board_HasGameEnded(t *testing.T) {
+	board := newBoard()
+
+	t.Run("no checkmate yet", func(t *testing.T) {
+		board.position[types.Coordinate{Col: 1, Row: 1}] = King{Color: types.White}
+		board.position[types.Coordinate{Col: 7, Row: 6}] = Queen{Color: types.White}
+		board.position[types.Coordinate{Col: 7, Row: 7}] = Queen{Color: types.White}
+
+		board.position[types.Coordinate{Col: 2, Row: 8}] = King{Color: types.Black}
+
+		whiteMove := types.Move{
+			StartSquare: types.Coordinate{Col: 7, Row: 6},
+			EndSquare:   types.Coordinate{Col: 8, Row: 6},
+			ColorMoved:  types.White,
+		}
+		valid, violation := board.CheckAndPlay(&whiteMove)
+		assert.True(t, valid)
+		assert.Empty(t, violation)
+
+		gameEnded, reason := board.HasGameEnded(whiteMove)
+
+		assert.False(t, gameEnded)
+		assert.Equal(t, NoReason, reason)
+	})
+
+	t.Run("checkmate move is made", func(t *testing.T) {
+		blackMove := types.Move{
+			StartSquare: types.Coordinate{Col: 2, Row: 8},
+			EndSquare:   types.Coordinate{Col: 1, Row: 8},
+			ColorMoved:  types.Black,
+		}
+		valid, violation := board.CheckAndPlay(&blackMove)
+		assert.True(t, valid)
+		assert.Empty(t, violation)
+
+		checkmateMove := types.Move{
+			StartSquare: types.Coordinate{Col: 8, Row: 6},
+			EndSquare:   types.Coordinate{Col: 8, Row: 8},
+			ColorMoved:  types.White,
+		}
+
+		valid, violation = board.CheckAndPlay(&checkmateMove)
+		assert.True(t, valid)
+		assert.Empty(t, violation)
+
+		gameEnded, reason := board.HasGameEnded(checkmateMove)
+		assert.True(t, gameEnded)
+		assert.Equal(t, BlackIsCheckmated, reason)
+	})
+}
+
+func Test_Board_HasGameEnded_RookBlocks(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 1, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 8, Row: 7}] = Queen{Color: types.White}
+	board.position[types.Coordinate{Col: 7, Row: 7}] = Queen{Color: types.White}
+
+	board.position[types.Coordinate{Col: 1, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 2, Row: 2}] = Rook{Color: types.Black}
+
+	whiteMove := types.Move{
+		StartSquare: types.Coordinate{Col: 8, Row: 7},
+		EndSquare:   types.Coordinate{Col: 8, Row: 8},
+		ColorMoved:  types.White,
+	}
+	valid, violation := board.CheckAndPlay(&whiteMove)
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+
+	gameEnded, reason := board.HasGameEnded(whiteMove)
+	assert.False(t, gameEnded)
+	assert.Equal(t, NoReason, reason)
+}

chess/game.go

@@ -8,8 +8,7 @@ import (
 	"mchess_server/types"
 
 	"github.com/google/uuid"
-	"github.com/samber/lo"
-	"nhooyr.io/websocket"
+	gorillaws "github.com/gorilla/websocket"
 )
 
 type Game struct {
@@ -27,6 +26,7 @@ const (
 	PlayerToMove
 	CheckMove
 	CheckPlayerChange
+	GameEnded
 )
 
 func NewGame() *Game {
@@ -58,8 +58,8 @@ func (game Game) GetPlayer2() *Player {
 }
 
 func (game *Game) prepare() {
-	game.players[0].color = types.White
-	game.players[1].color = types.Black
+	game.players[0].SetColor(types.White)
+	game.players[1].SetColor(types.Black)
 
 	game.currentTurnPlayer = game.GetPlayer1()
 
@@ -85,6 +85,7 @@ func (game *Game) Handle() {
 	defer game.killGame()
 
 	var receivedMove types.Move
+	var gameEndReason GameEndedReason
 	var err error
 
 	for {
@@ -98,29 +99,31 @@ func (game *Game) Handle() {
 			game.gameState = PlayerToMove
 
 		case PlayerToMove:
-			log.Println("with ", game.currentTurnPlayer.GetPlayerColor(), " to move")
+			log.Println("with ", game.currentTurnPlayer.GetColor(), " to move")
 			receivedMove, err = game.currentTurnPlayer.ReadMove()
 			if err != nil {
 				log.Println("Error while reading message:", err)
 				return
 			}
-			log.Println("Player ", game.currentTurnPlayer, " moved:\n", receivedMove)
+			log.Println("Player ", game.currentTurnPlayer.color.String(), " moved:\n", receivedMove)
 
 			game.gameState = CheckMove
 		case CheckMove:
-			valid, ruleViolation := game.board.CheckAndPlay(receivedMove)
+			valid, ruleViolation := game.board.CheckAndPlay(&receivedMove)
 
-			if valid {
-				game.gameState = CheckPlayerChange
-			} else {
+			if !valid {
 				invalidMoveMessage, err := api.GetInvalidMoveMessage(receivedMove, ruleViolation.String())
 				if err != nil {
 					log.Println("Error marshalling 'colorDetermined' message for player 1", err)
 					return
 				}
-				game.currentTurnPlayer.writeMessage(invalidMoveMessage)
+				game.currentTurnPlayer.writeMessage(string(invalidMoveMessage))
 				game.gameState = PlayerToMove
+				continue
 			}
+
+			game.gameState = CheckPlayerChange
+
 		case CheckPlayerChange:
 			if game.currentTurnPlayer.Uuid == game.players[0].Uuid {
 				game.currentTurnPlayer = game.players[1]
@@ -134,7 +137,17 @@ func (game *Game) Handle() {
 				return
 			}
 
+			if gameEnded, reason := game.board.HasGameEnded(receivedMove); gameEnded {
+				gameEndReason = reason
+				game.gameState = GameEnded
+				continue
+			}
+
 			game.gameState = PlayerToMove
+
+		case GameEnded:
+			game.broadcastGameEnd(gameEndReason)
+			return
 		}
 		log.Println("GameState = ", game.gameState)
 	}
@@ -144,6 +157,14 @@ func (game *Game) AddPlayersToGame(player *Player) {
 	game.players = append(game.players, player)
 }
 
+func (game *Game) AreBothPlayersConnected() bool {
+	if len(game.GetPlayers()) < 2 {
+		return false
+	}
+
+	return game.players[0].hasWebsocketConnection() && game.players[1].hasWebsocketConnection()
+}
+
 func (game *Game) killGame() {
 	log.Println("Game should be killed")
 }
@@ -160,35 +181,49 @@ func (game Game) notifyPlayersAboutGameStart() error {
 		return err
 	}
 
-	game.GetPlayer1().writeMessage(colorDeterminedPlayer1)
+	game.GetPlayer1().writeMessage(string(colorDeterminedPlayer1))
 	game.GetPlayer1().SendBoardState(types.Move{}, game.board.PGN(), types.White)
 
-	game.GetPlayer2().writeMessage(colorDeterminedPlayer2)
+	game.GetPlayer2().writeMessage(string(colorDeterminedPlayer2))
 	game.GetPlayer2().SendBoardState(types.Move{}, game.board.PGN(), types.White)
 	return nil
 }
 
 func (game Game) broadcastMove(move types.Move) error {
-	err := game.GetPlayer1().SendBoardState(move, game.board.PGN(), game.currentTurnPlayer.color)
+	log.Println("broadcast move")
+	err := game.GetPlayer1().SendBoardState(move, game.board.PGN(), game.currentTurnPlayer.GetColor())
 	if err != nil {
 		return err
 	}
 
-	err = game.GetPlayer2().SendBoardState(move, game.board.PGN(), game.currentTurnPlayer.color)
+	err = game.GetPlayer2().SendBoardState(move, game.board.PGN(), game.currentTurnPlayer.GetColor())
 	if err != nil {
 		return err
 	}
 	return nil
 }
 
-func (game *Game) playerDisconnected(p *Player) {
-	log.Println(string(p.color), " disconnected")
-	playerStillInGame := lo.Filter(game.players, func(player *Player, _ int) bool {
-		return player.color != p.color
-	})
-	game.players = playerStillInGame
+func (game Game) broadcastGameEnd(reason GameEndedReason) error {
+	err := game.GetPlayer1().SendGameEnded(reason)
+	if err != nil {
+		return err
+	}
+
+	err = game.GetPlayer2().SendGameEnded(reason)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
-func (game *Game) SetWebsocketConnectionFor(ctx context.Context, p *Player, ws *websocket.Conn) {
-	p.SetWebsocketConnectionAndSendBoardState(ctx, ws, game.board.PGN(), game.board.colorToMove)
+func (game *Game) playerDisconnected(p *Player) {
+}
+
+func (game *Game) SetWebsocketConnectionFor(ctx context.Context, p *Player, ws *gorillaws.Conn) {
+	p.SetWebsocketConnectionAndSendBoardState(ctx, ws, &game.board)
+}
+
+func (game *Game) SendBoardStateTo(p *Player) {
+	p.SendBoardState(game.board.getLastMove(), game.board.PGN(), game.board.colorToMove)
 }

chess/king.go

@@ -9,14 +9,14 @@ type King struct {
 }
 
 func (k King) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
-	return k.GetAllNonBlockedMoves(board, fromSquare)
+	return k.GetAllNonBlockedSquares(board, fromSquare)
 }
 
 func (k King) GetColor() types.ChessColor {
 	return k.Color
 }
 
-func (k King) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (k King) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	return board.GetNonBlockedKingMoves(fromSquare)
 }
 
@@ -29,25 +29,26 @@ func (k King) AfterMoveAction(board *Board, fromSquare types.Coordinate) {
 	}
 }
 
-func (k King) HandleCastling(board *Board, move types.Move) (bool, error) {
+func (k King) HandleCastling(board *Board, move types.Move) (bool, Violation) {
+	if !k.isMoveCastlingMove(board, move) {
+		return false, ""
+	}
+
 	if k.hadMovedBefore(board) {
-		return false, nil
+		return false, ""
 	}
 
-	valid, dir := k.movedOnValidCastlingSquare(board, move)
+	if board.isSquareAttacked(move.StartSquare, k.Color.Opposite()) {
+		return false, CastlingWhileKingInCheck
+	}
+
+	valid, dir := k.isCastlingAllowed(board, move)
 	if !valid {
-		return false, nil
-	}
-
-	switch k.Color {
-	case types.White:
-		board.state.WhiteKingMoved = true
-	case types.Black:
-		board.state.BlackKingMoved = true
+		return false, ""
 	}
 
 	k.playCastlingOnBoard(board, move, dir)
-	return true, nil
+	return true, ""
 }
 
 func (k King) hadMovedBefore(b *Board) bool {
@@ -64,52 +65,95 @@ func (k King) hadMovedBefore(b *Board) bool {
 type CastlingDirection string
 
 const (
+	NoDirection   CastlingDirection = ""
 	CastlingRight CastlingDirection = "right"
 	CastlingLeft  CastlingDirection = "left"
 )
 
-func (k King) movedOnValidCastlingSquare(b *Board, move types.Move) (bool, CastlingDirection) {
+func (k King) isMoveCastlingMove(b *Board, move types.Move) bool {
+	var destinationSquareForKingRight types.Coordinate
+	var destinationSquareForKingLeft types.Coordinate
+
+	switch k.Color {
+	case types.White:
+		destinationSquareForKingRight = types.Coordinate{Col: 7, Row: 1}
+		destinationSquareForKingLeft = types.Coordinate{Col: 3, Row: 1}
+
+	case types.Black:
+		destinationSquareForKingRight = types.Coordinate{Col: 7, Row: 8}
+		destinationSquareForKingLeft = types.Coordinate{Col: 3, Row: 8}
+	}
+
+	if move.EndSquare == destinationSquareForKingRight ||
+		move.EndSquare == destinationSquareForKingLeft {
+		return true
+	}
+
+	return false
+}
+
+func (k King) isCastlingAllowed(b *Board, move types.Move) (bool, CastlingDirection) {
 	var valid = false
 
 	switch k.Color {
 	case types.White:
-		castlingSquareRight := types.Coordinate{Col: 7, Row: 1}
-		castlingSquareLeft := types.Coordinate{Col: 3, Row: 1}
+		destinationSquareForKingRight := types.Coordinate{Col: 7, Row: 1}
+		destinationSquareForKingLeft := types.Coordinate{Col: 3, Row: 1}
 
-		if move.EndSquare == castlingSquareRight &&
-			b.getPieceAt(castlingSquareRight) == nil &&
-			b.getPieceAt(*castlingSquareRight.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingRight &&
+			b.getPieceAt(destinationSquareForKingRight) == nil &&
+			b.getPieceAt(*destinationSquareForKingRight.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingRight, types.Black) &&
+			!b.isSquareAttacked(*destinationSquareForKingRight.Left(1), types.Black) &&
 			!b.state.WhiteHRookMoved {
-			return true, CastlingRight
+			_, ok := b.getPieceAt(types.Coordinate{Col: 8, Row: 1}).(Rook)
+			if ok {
+				return true, CastlingRight
+			}
 		}
 
-		if move.EndSquare == castlingSquareLeft &&
-			b.getPieceAt(castlingSquareLeft) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Right(1)) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingLeft &&
+			b.getPieceAt(destinationSquareForKingLeft) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Right(1)) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingLeft, types.Black) &&
+			!b.isSquareAttacked(*destinationSquareForKingLeft.Right(1), types.Black) &&
 			!b.state.WhiteARookMoved {
-			return true, CastlingLeft
+			_, ok := b.getPieceAt(types.Coordinate{Col: 1, Row: 1}).(Rook)
+			if ok {
+				return true, CastlingLeft
+			}
 		}
 	case types.Black:
-		castlingSquareRight := types.Coordinate{Col: 7, Row: 8}
-		castlingSquareLeft := types.Coordinate{Col: 3, Row: 8}
+		destinationSquareForKingRight := types.Coordinate{Col: 7, Row: 8}
+		destinationSquareForKingLeft := types.Coordinate{Col: 3, Row: 8}
 
-		if move.EndSquare == castlingSquareRight &&
-			b.getPieceAt(castlingSquareRight) == nil &&
-			b.getPieceAt(*castlingSquareRight.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingRight &&
+			b.getPieceAt(destinationSquareForKingRight) == nil &&
+			b.getPieceAt(*destinationSquareForKingRight.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingRight, types.White) &&
+			!b.isSquareAttacked(*destinationSquareForKingRight.Left(1), types.White) &&
 			!b.state.BlackHRookMoved {
-			return true, CastlingRight
+			_, ok := b.getPieceAt(types.Coordinate{Col: 8, Row: 8}).(Rook)
+			if ok {
+				return true, CastlingRight
+			}
 		}
 
-		if move.EndSquare == castlingSquareLeft &&
-			b.getPieceAt(castlingSquareLeft) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Right(1)) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingLeft &&
+			b.getPieceAt(destinationSquareForKingLeft) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Right(1)) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingLeft, types.White) &&
+			!b.isSquareAttacked(*destinationSquareForKingLeft.Right(1), types.White) &&
 			!b.state.BlackARookMoved {
-			return true, CastlingLeft
+			_, ok := b.getPieceAt(types.Coordinate{Col: 1, Row: 8}).(Rook)
+			if ok {
+				return true, CastlingLeft
+			}
 		}
 	}
-	return valid, CastlingRight
+	return valid, NoDirection
 }
 
 func (k King) playCastlingOnBoard(board *Board, move types.Move, dir CastlingDirection) {

chess/knight.go

@@ -9,14 +9,14 @@ type Knight struct {
 }
 
 func (n Knight) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
-	return n.GetAllNonBlockedMoves(board, fromSquare)
+	return n.GetAllNonBlockedSquares(board, fromSquare)
 }
 
 func (n Knight) GetColor() types.ChessColor {
 	return n.Color
 }
 
-func (n Knight) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (n Knight) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	return board.GetNonBlockedKnightMoves(fromSquare)
 }
 

chess/pawn.go

@@ -12,7 +12,7 @@ type Pawn struct {
 
 func (p Pawn) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	attackingMoves := make([]types.Coordinate, 0, 2)
-	allMoves := p.GetAllNonBlockedMoves(board, fromSquare)
+	allMoves := p.GetAllNonBlockedSquares(board, fromSquare)
 	for _, move := range allMoves {
 		if move.Col != fromSquare.Col {
 			attackingMoves = append(attackingMoves, move)
@@ -21,7 +21,7 @@ func (p Pawn) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []
 	return attackingMoves
 }
 
-func (p Pawn) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (p Pawn) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	theoreticalSquares := p.getAllMoves(fromSquare)
 	legalSquares := p.filterBlockedSquares(board, fromSquare, theoreticalSquares)
 
@@ -32,7 +32,7 @@ func (p Pawn) GetColor() types.ChessColor {
 	return p.Color
 }
 
-func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, error) {
+func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, Violation) {
 	var isPromotionMove bool
 	var promotionToPiece types.PieceShortName
 
@@ -62,14 +62,14 @@ func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, error)
 		b.position[move.EndSquare] = GetPieceForShortName(promotionToPiece)
 	}
 
-	return isPromotionMove, nil
+	return isPromotionMove, ""
 }
 
-func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, error) {
+func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, Violation) {
 	var wasEnPassant bool
 
 	if lastMove.PieceMoved.ToCommon() != types.PawnShortName {
-		return false, nil
+		return false, ""
 	}
 
 	switch move.ColorMoved {
@@ -127,7 +127,7 @@ func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, error
 		b.position[move.EndSquare] = GetPieceForShortName(move.PieceMoved)
 	}
 
-	return wasEnPassant, nil
+	return wasEnPassant, ""
 }
 func (p Pawn) getAllMoves(fromSquare types.Coordinate) []types.Coordinate {
 	theoreticalMoves := make([]types.Coordinate, 0, 4)

chess/piece_interface.go

@@ -6,7 +6,7 @@ import (
 )
 
 type Piece interface {
-	GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate
+	GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate
 	GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate
 	GetColor() types.ChessColor
 	AfterMoveAction(board *Board, fromSquare types.Coordinate)

chess/player.go

@@ -10,7 +10,7 @@ import (
 	"mchess_server/types"
 
 	"github.com/google/uuid"
-	"nhooyr.io/websocket"
+	gorillaws "github.com/gorilla/websocket"
 )
 
 type Player struct {
@@ -20,17 +20,13 @@ type Player struct {
 	disconnectCallback func(p *Player)
 }
 
-func NewPlayer(uuid uuid.UUID, opts ...func(*Player)) *Player {
+func NewPlayer(uuid uuid.UUID) *Player {
 	player := &Player{
 		Uuid: uuid,
 		Conn: connection.NewConnection(
 			connection.WithContext(context.Background())),
 	}
 
-	for _, opt := range opts {
-		opt(player)
-	}
-
 	return player
 }
 
@@ -38,18 +34,27 @@ func (p Player) hasWebsocketConnection() bool {
 	return p.Conn.HasWebsocketConnection()
 }
 
-func (p *Player) SetWebsocketConnection(ctx context.Context, ws *websocket.Conn) {
+func (p *Player) SetWebsocketConnection(ctx context.Context, ws *gorillaws.Conn) {
 	p.Conn.SetWebsocketConnection(ws)
+	p.Conn.SetForColor(p.color)
 }
 
 func (p *Player) SetWebsocketConnectionAndSendBoardState(
 	ctx context.Context,
-	ws *websocket.Conn,
-	boardPosition string,
-	turnColor types.ChessColor,
+	ws *gorillaws.Conn,
+	board *Board,
 ) {
 	p.SetWebsocketConnection(ctx, ws)
-	p.SendBoardState(types.Move{}, boardPosition, turnColor)
+	p.SendBoardState(board.getLastMove(), board.PGN(), board.colorToMove)
+}
+
+func (p *Player) SetColor(color types.ChessColor) {
+	p.color = color
+	p.Conn.SetForColor(p.color)
+}
+
+func (p *Player) GetColor() types.ChessColor {
+	return p.color
 }
 
 func (p *Player) SetDisconnectCallback(cb func(*Player)) {
@@ -67,8 +72,8 @@ func (p *Player) IsInGame() bool {
 }
 
 func (p *Player) SendBoardState(move types.Move, boardPosition string, turnColor types.ChessColor) error {
-	var pColor = p.color
-	if p.color == "" { // we default to white if we do not know the color yet
+	var pColor = p.GetColor()
+	if p.GetColor() == "" { // we default to white if we do not know the color yet
 		pColor = types.White
 	}
 
@@ -84,11 +89,8 @@ func (p *Player) SendBoardState(move types.Move, boardPosition string, turnColor
 		return err
 	}
 
-	err = p.writeMessage(messageToSend)
-	if err != nil {
-		log.Println("Error during message writing:", err)
-		return err
-	}
+	p.writeMessage(string(messageToSend))
+
 	return nil
 }
 
@@ -103,26 +105,35 @@ func (p *Player) SendMoveAndPosition(move types.Move, boardPosition string) erro
 		return err
 	}
 
-	err = p.writeMessage(messageToSend)
-	if err != nil {
-		log.Println("Error during message writing:", err)
-		return err
-	}
+	p.writeMessage(string(messageToSend))
+
 	return nil
 }
 
-func (p *Player) writeMessage(msg []byte) error {
-	return p.Conn.Write(msg)
+func (p *Player) SendGameEnded(reason GameEndedReason) error {
+	reasonToSend := reason.String()
+	messageToSend, err := json.Marshal(api.WebsocketMessage{
+		Type:   api.GameEnded,
+		Reason: &reasonToSend,
+	})
+	if err != nil {
+		log.Println("Error while marshalling: ", err)
+		return err
+	}
+	p.writeMessage(string(messageToSend))
+
+	return nil
+}
+
+func (p *Player) writeMessage(msg string) {
+	p.Conn.Write(msg)
 }
 
 func (p *Player) ReadMove() (types.Move, error) {
-	receivedMessage, err := p.readMessage()
-	if err != nil {
-		return types.Move{}, err
-	}
+	receivedMessage := p.readMessage()
 
 	var msg api.WebsocketMessage
-	err = json.Unmarshal(receivedMessage, &msg)
+	err := json.Unmarshal(receivedMessage, &msg)
 	if err != nil {
 		return types.Move{}, err
 	}
@@ -134,17 +145,9 @@ func (p *Player) ReadMove() (types.Move, error) {
 	return *msg.Move, nil
 }
 
-func (p *Player) readMessage() ([]byte, error) {
-	msg, err := p.Conn.Read()
-	log.Printf("Reading message: %s from player %s", string(msg), p.Uuid.String())
+func (p *Player) readMessage() []byte {
+	msg := p.Conn.Read()
+	log.Printf("Reading message from %s: %s", p.color.String(), string(msg))
 
-	return msg, err
-}
-
-func (p Player) GetPlayerColor() string {
-	return string(p.color)
-}
-
-func (p Player) IsEqualTo(other *Player) bool {
-	return p.Uuid.ID() == other.Uuid.ID()
+	return msg
 }

chess/queen.go

@@ -9,14 +9,14 @@ type Queen struct {
 }
 
 func (q Queen) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
-	return q.GetAllNonBlockedMoves(board, fromSquare)
+	return q.GetAllNonBlockedSquares(board, fromSquare)
 }
 
 func (q Queen) GetColor() types.ChessColor {
 	return q.Color
 }
 
-func (q Queen) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (q Queen) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	squares := board.GetNonBlockedRowAndColumn(fromSquare)
 	squares = append(squares, board.GetNonBlockedDiagonals(fromSquare)...)
 	return squares

chess/rook.go

@@ -9,14 +9,14 @@ type Rook struct {
 }
 
 func (r Rook) GetAllAttackedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
-	return r.GetAllNonBlockedMoves(board, fromSquare)
+	return r.GetAllNonBlockedSquares(board, fromSquare)
 }
 
 func (r Rook) GetColor() types.ChessColor {
 	return r.Color
 }
 
-func (r Rook) GetAllNonBlockedMoves(board Board, fromSquare types.Coordinate) []types.Coordinate {
+func (r Rook) GetAllNonBlockedSquares(board Board, fromSquare types.Coordinate) []types.Coordinate {
 	return board.GetNonBlockedRowAndColumn(fromSquare)
 }
 

chess/rook_test.go

@@ -14,7 +14,7 @@ func Test_Rook_GetNonBlockedSquares(t *testing.T) {
 		rook := Rook{Color: types.Black}
 
 		board.position[types.Coordinate{Col: 5, Row: 5}] = rook
-		squares := rook.GetAllNonBlockedMoves(board, types.Coordinate{Col: 5, Row: 5})
+		squares := rook.GetAllNonBlockedSquares(board, types.Coordinate{Col: 5, Row: 5})
 		assert.Len(t, squares, 14)
 	})
 
@@ -28,7 +28,7 @@ func Test_Rook_GetNonBlockedSquares(t *testing.T) {
 		board.position[types.Coordinate{Col: 5, Row: 6}] = Pawn{Color: types.White}
 		board.position[types.Coordinate{Col: 6, Row: 5}] = Pawn{Color: types.Black}
 
-		squares := rook.GetAllNonBlockedMoves(board, rookCoordinate)
+		squares := rook.GetAllNonBlockedSquares(board, rookCoordinate)
 
 		squaresOnLeft := lo.Filter(squares, func(square types.Coordinate, _ int) bool {
 			return square.Row == rookCoordinate.Row && square.Col < rookCoordinate.Col

chess/violation.go

@@ -3,12 +3,15 @@ package chess
 type Violation string
 
 var (
-	InvalidMove            Violation = "invalid move"
-	NoPieceAtStartSquare   Violation = "no piece at start square"
-	WrongColorMoved        Violation = "wrong color moved"
-	TargetSquareIsOccupied Violation = "target square is occupied"
-	KingInCheck            Violation = "king would be in check after move"
-	SomethingWentWrong     Violation = "something went wrong"
+	InvalidMove              Violation = "invalid move"
+	NoPieceAtStartSquare     Violation = "no piece at start square"
+	WrongColorMoved          Violation = "wrong color moved"
+	TargetSquareIsOccupied   Violation = "target square is occupied"
+	KingInCheck              Violation = "king would be in check after move"
+	SomethingWentWrong       Violation = "something went wrong"
+	CastlingThroughCheck     Violation = "king would move through check"
+	CastlingWhileKingInCheck Violation = "king cannot castle while in check"
+	CastlingKingMovedBefore  Violation = "king cannot caslte because he moved before"
 )
 
 func (v Violation) String() string {

connection/message_buffer.go

@@ -50,7 +50,7 @@ func (b *MessageBuffer) Insert(msg string) {
 	b.cond.Broadcast()
 }
 
-func (b *MessageBuffer) Get() (string, error) {
+func (b *MessageBuffer) Get() string {
 	b.cond.L.Lock()
 	defer b.cond.L.Unlock()
 
@@ -69,7 +69,7 @@ func (b *MessageBuffer) Get() (string, error) {
 	}
 	b.getIndex = b.incrementAndWrapIndex(b.getIndex)
 
-	return msg.content, nil
+	return msg.content
 }
 
 func (b MessageBuffer) incrementAndWrapIndex(index int) int {

connection/message_buffer_test.go

@@ -66,8 +66,7 @@ func Test_MessageBuffer_GetWaitsForFirstData(t *testing.T) {
 		buf.Insert("delayed-message")
 	}()
 
-	msg, err := buf.Get()
-	assert.NoError(t, err)
+	msg := buf.Get()
 
 	endTime := time.Now()
 
@@ -79,8 +78,7 @@ func Test_MessageBuffer_GetWaitsForNewData(t *testing.T) {
 	buf := newMessageBuffer(2)
 
 	buf.Insert("message-1")
-	msg, err := buf.Get()
-	assert.NoError(t, err)
+	msg := buf.Get()
 	assert.Equal(t, "message-1", msg)
 
 	go func() {
@@ -89,8 +87,7 @@ func Test_MessageBuffer_GetWaitsForNewData(t *testing.T) {
 		buf.Insert("delayed-message")
 	}()
 
-	msg, err = buf.Get()
-	assert.NoError(t, err)
+	msg = buf.Get()
 	assert.Equal(t, "delayed-message", msg)
 }
 
@@ -117,8 +114,7 @@ func Test_MessageBuffer_IndexesAreCorrectAfterOverwritingOldData(t *testing.T) {
 		},
 		buf.messages)
 
-	msg, err := buf.Get()
-	assert.NoError(t, err)
+	msg := buf.Get()
 	assert.Equal(t, "message-2", msg)
 }
 
@@ -126,13 +122,11 @@ func Test_MessageBuffer_GetWaitsForNewDataIfOldOneWasAlreadyGotten(t *testing.T)
 	buf := newMessageBuffer(2)
 
 	buf.Insert(message1)
-	msg, err := buf.Get()
-	assert.NoError(t, err)
+	msg := buf.Get()
 	assert.Equal(t, message1, msg)
 
 	buf.Insert(message2)
-	msg, err = buf.Get()
-	assert.NoError(t, err)
+	msg = buf.Get()
 	assert.Equal(t, message2, msg)
 
 	go func() {
@@ -140,8 +134,7 @@ func Test_MessageBuffer_GetWaitsForNewDataIfOldOneWasAlreadyGotten(t *testing.T)
 		buf.Insert(message3)
 	}()
 
-	msg, err = buf.Get()
-	assert.NoError(t, err)
+	msg = buf.Get()
 	assert.Equal(t, message3, msg)
 
 }
@@ -157,9 +150,8 @@ func Test_MessageBuffer_InsertCatchesUpWithRead(t *testing.T) {
 	buf.Insert(message6)
 	buf.Insert(message7)
 
-	msg, err := buf.Get()
+	msg := buf.Get()
 
-	assert.NoError(t, err)
 	assert.Equal(t, message3, msg)
 }
 
@@ -172,7 +164,7 @@ func Test_MessageBuffer_FuckShitUp(t *testing.T) {
 	var readMsg = make([]string, 0)
 	go func() {
 		for i := 0; i < size*10; i++ {
-			msg, _ := buf.Get()
+			msg := buf.Get()
 			if msg == "99" {
 				break
 			}

connection/type.go

@@ -3,22 +3,38 @@ package connection
 import (
 	"context"
 	"log"
+	"mchess_server/types"
+	"sync"
 
-	"nhooyr.io/websocket"
+	"github.com/google/uuid"
+	gorillaws "github.com/gorilla/websocket"
 )
 
 type Connection struct {
-	ws                      *websocket.Conn
-	wsConnectionEstablished chan bool
-	ctx                     context.Context
-	buffer                  MessageBuffer
-	disconnectCallback      func()
+	ID                 uuid.UUID
+	ws                 *gorillaws.Conn
+	ctx                context.Context
+	rxBuffer           *MessageBuffer
+	txBuffer           *MessageBuffer
+	disconnectCallback func()
+	forColor           types.ChessColor
+
+	/* this is a hack since a user using the same
+	browser might get the same object of type Connection in two instances of
+	the same browser. Then if  Close() gets called for both of these instances
+	the first Close() will set ws=nil, and the seconds one will dereference this
+	nil pointer. The correct way to fix this, is to make sure, two instances
+	of the same browser do not get the same connection instance.
+	At the moment, the usage of localStorage 'identifies' an already connected
+	player and reuses the old Connection struct instance */
+	closingMutex sync.Mutex
 }
 
 func NewConnection(options ...func(*Connection)) *Connection {
 	connection := Connection{
-		buffer:                  *newMessageBuffer(100),
-		wsConnectionEstablished: make(chan bool),
+		ID:       uuid.New(),
+		rxBuffer: newMessageBuffer(100),
+		txBuffer: newMessageBuffer(100),
 	}
 
 	for _, option := range options {
@@ -28,7 +44,7 @@ func NewConnection(options ...func(*Connection)) *Connection {
 	return &connection
 }
 
-func WithWebsocket(ws *websocket.Conn) func(*Connection) {
+func WithWebsocket(ws *gorillaws.Conn) func(*Connection) {
 	return func(c *Connection) {
 		c.ws = ws
 	}
@@ -48,6 +64,10 @@ func WithDisconnectCallback(cb func()) func(*Connection) {
 	}
 }
 
+func (conn *Connection) SetForColor(color types.ChessColor) {
+	conn.forColor = color
+}
+
 func (conn *Connection) SetDisconnectCallback(cb func()) {
 	conn.disconnectCallback = cb
 }
@@ -56,53 +76,81 @@ func (conn *Connection) HasWebsocketConnection() bool {
 	return conn.ws != nil
 }
 
-func (conn *Connection) SetWebsocketConnection(ws *websocket.Conn) {
+func (conn *Connection) readFromRxBuffer() {
+	for {
+		_, msg, err := conn.ws.ReadMessage()
+		if err != nil {
+			conn.logConnection("while reading from websocket: %w", "ERROR:", err.Error())
+			conn.Close("")
+			return
+		}
+		conn.rxBuffer.Insert(string(msg))
+	}
+}
+
+func (conn *Connection) writeTxBuffer() {
+	for {
+		msg := conn.txBuffer.Get()
+
+		if conn.ws == nil {
+			return
+		}
+
+		err := conn.ws.WriteMessage(gorillaws.TextMessage, []byte(msg))
+		if err != nil {
+			conn.logConnection("while writing to websocket: %w", "ERROR:", err.Error())
+			return
+		}
+	}
+}
+
+func (conn *Connection) SetWebsocketConnection(ws *gorillaws.Conn) {
 	if ws == nil {
+		conn.logConnection("ERROR: setting ws = null")
 		return
 	}
 
 	conn.ws = ws
 
-	select {
-	case conn.wsConnectionEstablished <- true:
-	default:
-	}
+	go conn.readFromRxBuffer()
+	go conn.writeTxBuffer()
 
-	go func() {
-		for {
-			_, msg, err := conn.ws.Read(conn.ctx)
-			if err != nil {
-				log.Println("while reading from websocket: %w", err)
-				if conn.disconnectCallback != nil {
-					conn.disconnectCallback()
-				}
-				return
-			}
-			conn.buffer.Insert(string(msg))
-		}
-	}()
+	defer conn.logConnection("websocket connection set")
 }
 
-func (conn *Connection) Write(msg []byte) error {
-	if conn.ws == nil { //if ws is not yet set, we wait for it
-		<-conn.wsConnectionEstablished
-	}
-
-	log.Printf("Writing message: %s", string(msg))
-	return conn.ws.Write(conn.ctx, websocket.MessageText, msg)
+func (conn *Connection) Write(msg string) {
+	conn.logConnection("Writing message: ", string(msg))
+	conn.txBuffer.Insert(msg)
 }
 
-func (conn *Connection) Read() ([]byte, error) {
-	msg, err := conn.buffer.Get()
-	if err != nil {
-		conn.ws = nil
-		return nil, err // Tell game-handler that connection was lost
-	}
+func (conn *Connection) Read() []byte {
+	msg := conn.rxBuffer.Get()
 
-	return []byte(msg), err
+	return []byte(msg)
 }
 
 func (conn *Connection) Close(msg string) {
-	conn.ws.Close(websocket.StatusCode(400), msg)
+	/* This is a hack, do not try this at home.
+	See more details at the definition of Connection */
+	conn.closingMutex.Lock()
+	defer conn.closingMutex.Unlock()
+
+	if conn == nil || conn.ws == nil {
+		return
+	}
+
+	conn.logConnection("closing websocket connection")
+	conn.ws.WriteMessage(gorillaws.TextMessage, []byte(msg))
+	conn.ws.Close()
 	conn.ws = nil
+	conn.txBuffer.Insert("we do this to make txBuffer.Get() return")
+}
+
+func (con *Connection) logConnection(v ...string) {
+	a := ""
+
+	for _, s := range v {
+		a += s + ", "
+	}
+	log.Println(a, "on connection ", con.ID, ", for color ", con.forColor.String())
 }

go.mod

@@ -1,46 +1,46 @@
 module mchess_server
 
-go 1.21.1
+go 1.22
 
 require (
-	github.com/gin-gonic/gin v1.9.1
-	github.com/google/uuid v1.5.0
-	github.com/samber/lo v1.39.0
-	github.com/stretchr/testify v1.8.4
-	github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1
-	nhooyr.io/websocket v1.8.10
+	github.com/gin-gonic/gin v1.10.0
+	github.com/google/uuid v1.6.0
+	github.com/samber/lo v1.41.0
+	github.com/stretchr/testify v1.9.0
 )
 
+require github.com/benbjohnson/clock v1.3.5 // indirect
+
 require (
-	github.com/bytedance/sonic v1.10.2 // indirect
-	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
-	github.com/chenzhuoyu/iasm v0.9.1 // indirect
+	github.com/bytedance/sonic v1.11.9 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.4 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.16.0 // indirect
-	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/go-playground/validator/v10 v10.22.0 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/gorilla/websocket v1.5.3
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
-	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/onsi/ginkgo v1.16.5 // indirect
-	github.com/onsi/gomega v1.27.10 // indirect
-	github.com/pelletier/go-toml/v2 v2.1.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
-	golang.org/x/arch v0.6.0 // indirect
-	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
-	golang.org/x/net v0.19.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	google.golang.org/protobuf v1.32.0 // indirect
+	go.uber.org/ratelimit v0.3.1
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,65 +1,57 @@
-github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
-github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
-github.com/bytedance/sonic v1.10.2 h1:GQebETVBxYB7JGWJtLBi07OVzWwt+8dWA00gEVW2ZFE=
-github.com/bytedance/sonic v1.10.2/go.mod h1:iZcSUejdk5aukTND/Eu/ivjQuEL0Cu9/rf50Hi0u/g4=
-github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
-github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d h1:77cEq6EriyTZ0g/qfRdp61a3Uu/AWrgIq2s0ClJV1g0=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d/go.mod h1:8EPpVsBuRksnlj1mLy4AWzRNQYxauNi62uWcE3to6eA=
-github.com/chenzhuoyu/iasm v0.9.0/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
-github.com/chenzhuoyu/iasm v0.9.1 h1:tUHQJXo3NhBqw6s33wkGn9SP3bvrWLdlVIJ3hQBL7P0=
-github.com/chenzhuoyu/iasm v0.9.1/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
+github.com/benbjohnson/clock v1.3.5 h1:VvXlSJBzZpA/zum6Sj74hxwYI2DIxRWuNIoXAzHZz5o=
+github.com/benbjohnson/clock v1.3.5/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
-github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
 github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
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 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
-github.com/gin-gonic/gin v1.9.1 h1:4idEAncQnU5cB7BeOkPtxjfCSye0AAm1R0RVIqJ+Jmg=
-github.com/gin-gonic/gin v1.9.1/go.mod h1:hPrL7YrpYKXt5YId3A/Tnip5kqbEAP+KLuI3SUcPTeU=
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 github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
 github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
-github.com/go-playground/validator/v10 v10.16.0 h1:x+plE831WK4vaKHO/jpgUGsvLKIqRRkz6M78GuJAfGE=
-github.com/go-playground/validator/v10 v10.16.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU=
-github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
-github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
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-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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-golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
-golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
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-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
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-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
-google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
-google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
+golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-nhooyr.io/websocket v1.8.10 h1:mv4p+MnGrLDcPlBoWsvPP7XCzTYMXP9F9eIGoKbgx7Q=
-nhooyr.io/websocket v1.8.10/go.mod h1:rN9OFWIUwuxg4fR5tELlYC04bXYowCP9GX47ivo2l+c=
 nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

lobbies/lobby.go

@@ -1,4 +1,4 @@
-package lobby_registry
+package lobbies
 
 import (
 	"mchess_server/chess"
@@ -8,17 +8,15 @@ import (
 )
 
 type Lobby struct {
-	Uuid         uuid.UUID
-	Game         *chess.Game
-	PlayerJoined chan bool
-	Passphrase   utils.Passphrase
+	Uuid       uuid.UUID
+	Game       *chess.Game
+	Passphrase utils.Passphrase
 }
 
 func NewEmptyLobbyWithUUID(uuid uuid.UUID) *Lobby {
 	return &Lobby{
-		Uuid:         uuid,
-		Game:         chess.NewGame(),
-		PlayerJoined: make(chan bool),
+		Uuid: uuid,
+		Game: chess.NewGame(),
 	}
 }
 
@@ -31,12 +29,16 @@ func newEmptyLobbyWithPassphrase() *Lobby {
 
 func (l *Lobby) AddPlayerAndStartGameIfFull(player *chess.Player) {
 	l.Game.AddPlayersToGame(player)
-	if l.IsFull() {
+	if l.ContainsTwoPlayers() {
 		l.Game.StartHandling()
 	}
 }
 
-func (w *Lobby) IsFull() bool {
+func (w *Lobby) AreBothPlayersConnected() bool {
+	return w.Game.AreBothPlayersConnected()
+}
+
+func (w *Lobby) ContainsTwoPlayers() bool {
 	return len(w.Game.GetPlayers()) == 2
 }
 

lobbies/registry.go

@@ -1,4 +1,4 @@
-package lobby_registry
+package lobbies
 
 import (
 	"mchess_server/utils"
@@ -7,7 +7,7 @@ import (
 )
 
 type LobbyRegistry struct {
-	lobbies map[uuid.UUID]*Lobby
+	lobbies map[utils.Passphrase]*Lobby
 }
 
 var instance *LobbyRegistry
@@ -21,7 +21,7 @@ func GetLobbyRegistry() *LobbyRegistry {
 }
 
 func newLobbyRegistry() *LobbyRegistry {
-	return &LobbyRegistry{lobbies: make(map[uuid.UUID]*Lobby)}
+	return &LobbyRegistry{lobbies: make(map[utils.Passphrase]*Lobby)}
 }
 
 func (r *LobbyRegistry) CreateNewPrivateLobby() *Lobby {
@@ -32,7 +32,7 @@ func (r *LobbyRegistry) CreateNewPrivateLobby() *Lobby {
 
 func (r *LobbyRegistry) GetLobbyForPlayer() *Lobby {
 	for _, lobby := range r.lobbies {
-		if !lobby.IsFull() {
+		if !lobby.ContainsTwoPlayers() {
 			return lobby
 		}
 	}
@@ -42,15 +42,7 @@ func (r *LobbyRegistry) GetLobbyForPlayer() *Lobby {
 	return newLobby
 }
 
-func (r *LobbyRegistry) GetLobbyByUUID(uuid uuid.UUID) *Lobby {
-	return r.lobbies[uuid]
-}
-
 func (r *LobbyRegistry) GetLobbyByPassphrase(p utils.Passphrase) *Lobby {
-	if p.IsEmpty() {
-		return nil
-	}
-
 	for _, lobby := range r.lobbies {
 		if lobby.Passphrase == p {
 			return lobby
@@ -60,6 +52,6 @@ func (r *LobbyRegistry) GetLobbyByPassphrase(p utils.Passphrase) *Lobby {
 }
 
 func (r *LobbyRegistry) addNewLobby(lobby *Lobby) uuid.UUID {
-	r.lobbies[lobby.Uuid] = lobby
+	r.lobbies[lobby.Passphrase] = lobby
 	return lobby.Uuid
 }

lobbies/usher.go

@@ -0,0 +1,38 @@
+package lobbies
+
+import (
+	"mchess_server/chess"
+	"mchess_server/utils"
+)
+
+type Usher struct {
+}
+
+var usherInstance *Usher
+
+func newUsher() *Usher {
+	return &Usher{}
+}
+
+func GetUsher() *Usher {
+	if usherInstance == nil {
+		usherInstance = newUsher()
+	}
+	return usherInstance
+}
+
+func (u *Usher) WelcomeNewPlayer(player *chess.Player) *Lobby {
+	return GetLobbyRegistry().GetLobbyForPlayer()
+}
+
+func (u *Usher) CreateNewPrivateLobby(player *chess.Player) *Lobby {
+	return GetLobbyRegistry().CreateNewPrivateLobby()
+}
+
+func (u *Usher) FindExistingPrivateLobby(p utils.Passphrase) *Lobby {
+	return GetLobbyRegistry().GetLobbyByPassphrase(p)
+}
+
+func (u *Usher) AddPlayerToLobbyAndStartGameIfFull(player *chess.Player, lobby *Lobby) {
+	lobby.AddPlayerAndStartGameIfFull(player)
+}

main.go

@@ -1,30 +1,19 @@
 package main
 
 import (
-	"context"
-	"encoding/json"
 	"flag"
-	"fmt"
 	"log"
-	"mchess_server/api"
-	"mchess_server/chess"
-	lobbies "mchess_server/lobby_registry"
-	"mchess_server/usher"
-	"mchess_server/utils"
-	"net/http"
-	"sync"
+	"mchess_server/api/handler"
 
 	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-	"nhooyr.io/websocket"
 )
 
 var cert_path = "/etc/letsencrypt/live/chess.sw-gross.de/"
 var cert_file = cert_path + "fullchain.pem"
 var key_file = cert_path + "privkey.pem"
-var mut sync.Mutex
 
 func main() {
+	log.SetFlags(log.LstdFlags | log.Lmicroseconds)
 	var debugMode bool
 
 	debugModeLong := flag.Bool("debug", false, "activates debug mode")
@@ -35,10 +24,13 @@ func main() {
 	}
 
 	router := gin.Default()
-	router.GET("/api/random", registerForRandomGame)
-	router.GET("/api/hostPrivate", hostPrivateGame)
-	router.POST("/api/joinPrivate", joinPrivateGame)
-	router.GET("/api/ws", registerWebSocketConnection)
+	router.GET("/api/hostPrivate", handler.HostGameHandler)
+	router.POST("/api/joinPrivate", handler.JoinPrivateGame)
+	router.GET("/api/ws", handler.RegisterWebSocketConnection)
+
+	router.GET("/api/getLobbyForPassphrase/:phrase", handler.GetLobbyForPassphraseHandler)
+	router.GET("/api/registerWsForGame/:id", handler.ConnectWsForGame)
+	router.POST("/api/joinGame/:id", handler.JoinGameHandler)
 
 	if debugMode {
 		log.Println("Starting service WITHOUT TLS")
@@ -50,139 +42,3 @@ func main() {
 		log.Fatal(router.RunTLS("chess.sw-gross.de:9999", cert_file, key_file))
 	}
 }
-
-func registerForRandomGame(c *gin.Context) {
-	player := chess.NewPlayer(uuid.New())
-	usher := usher.GetUsher()
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := usher.WelcomeNewPlayer(player)
-	usher.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-
-	info := api.PlayerInfo{
-		PlayerID: &player.Uuid,
-		LobbyID:  &lobby.Uuid,
-	}
-	log.Println("responding with info ", info)
-
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func hostPrivateGame(c *gin.Context) {
-	player := chess.NewPlayer(uuid.New())
-	u := usher.GetUsher()
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := u.CreateNewPrivateLobby(player)
-	u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-
-	passphrase := lobby.Passphrase.String()
-	info := api.PlayerInfo{
-		PlayerID:   &player.Uuid,
-		LobbyID:    &lobby.Uuid,
-		Passphrase: &passphrase,
-	}
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func joinPrivateGame(c *gin.Context) {
-	req := api.PlayerInfo{}
-	log.Println(c.Request.Body)
-	err := c.ShouldBindJSON(&req)
-	if err != nil {
-		c.IndentedJSON(http.StatusBadRequest, req)
-	}
-
-	connectingPlayer := chess.NewPlayer(*req.PlayerID)
-	player := chess.NewPlayer(uuid.New())
-	u := usher.GetUsher()
-
-	if req.Passphrase != nil &&
-		*req.Passphrase != "" &&
-		req.PlayerID != nil &&
-		req.LobbyID != nil { //is reconnect
-		lobby := u.FindExistingPrivateLobbyByID(utils.Passphrase(*req.Passphrase))
-		_, found := lobby.GetPlayerByUUID(connectingPlayer.Uuid)
-		if found {
-			c.IndentedJSON(
-				http.StatusOK,
-				api.PlayerInfo{
-					PlayerID:   req.PlayerID,
-					LobbyID:    req.LobbyID,
-					Passphrase: req.Passphrase,
-				})
-			return
-		} else {
-			c.IndentedJSON(http.StatusNotFound, req)
-		}
-	}
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := u.FindExistingPrivateLobbyByID(utils.Passphrase(*req.Passphrase))
-	if lobby != nil {
-		u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-	} else {
-		c.IndentedJSON(http.StatusNotFound, req)
-		return
-	}
-
-	info := api.PlayerInfo{
-		PlayerID:   &player.Uuid,
-		LobbyID:    &lobby.Uuid,
-		Passphrase: req.Passphrase,
-	}
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func registerWebSocketConnection(c *gin.Context) {
-	webSocketConn, err := websocket.Accept(c.Writer, c.Request, &websocket.AcceptOptions{OriginPatterns: []string{"chess.sw-gross.de", "localhost:*"}})
-	if err != nil {
-		log.Println(err)
-		return
-	}
-	go waitForAndHandlePlayerID(c, webSocketConn)
-}
-
-func waitForAndHandlePlayerID(ctx context.Context, conn *websocket.Conn) {
-	msgType, msg, err := conn.Read(ctx)
-	if err != nil {
-		errorMessage := fmt.Sprintf("Reading from websocket connection did not work: %s", err)
-		log.Println(errorMessage)
-		conn.Close(websocket.StatusCode(400), errorMessage)
-		return
-	}
-
-	log.Println("read from websocket endpoint: ", msgType, string(msg), err)
-
-	var info api.PlayerInfo
-	err = json.Unmarshal(msg, &info)
-	if err != nil {
-		errorMessage := fmt.Sprintf("Unmarshaling message did not work: %s", err)
-		log.Println(errorMessage)
-		conn.Close(websocket.StatusCode(400), errorMessage)
-		return
-	}
-
-	lobby := lobbies.GetLobbyRegistry().GetLobbyByUUID(*info.LobbyID)
-	if lobby == nil {
-		conn.Close(websocket.StatusCode(400), "lobby not found")
-		return
-	}
-
-	player, found := lobby.GetPlayerByUUID(*info.PlayerID)
-	if !found {
-		conn.Close(websocket.StatusCode(400), "player not found")
-		return
-	}
-	if player.Conn.HasWebsocketConnection() {
-		player.Conn.Close("closing existing connection")
-	}
-	lobby.Game.SetWebsocketConnectionFor(ctx, player, conn)
-	log.Println("player after setting connection: ", player)
-}

types/common.go

@@ -3,8 +3,9 @@ package types
 type ChessColor string
 
 const (
-	White ChessColor = "white"
-	Black ChessColor = "black"
+	NoColor ChessColor = "no_color"
+	White   ChessColor = "white"
+	Black   ChessColor = "black"
 )
 
 func (c ChessColor) Opposite() ChessColor {
@@ -15,6 +16,10 @@ func (c ChessColor) Opposite() ChessColor {
 	}
 }
 
+func (c ChessColor) String() string {
+	return string(c)
+}
+
 type AdditionalState struct {
 	BlackKingMoved  bool
 	WhiteKingMoved  bool

usher/usher.go

@@ -1,41 +0,0 @@
-package usher
-
-import (
-	"mchess_server/chess"
-	lobbies "mchess_server/lobby_registry"
-	"mchess_server/utils"
-)
-
-type Usher struct {
-}
-
-var instance *Usher
-
-func newUsher() *Usher {
-	return &Usher{}
-}
-
-func GetUsher() *Usher {
-	if instance == nil {
-		instance = newUsher()
-	}
-	return instance
-}
-
-func (u *Usher) WelcomeNewPlayer(player *chess.Player) *lobbies.Lobby {
-	lobby := lobbies.GetLobbyRegistry().GetLobbyForPlayer()
-	return lobby
-}
-
-func (u *Usher) CreateNewPrivateLobby(player *chess.Player) *lobbies.Lobby {
-	lobby := lobbies.GetLobbyRegistry().CreateNewPrivateLobby()
-	return lobby
-}
-
-func (u *Usher) FindExistingPrivateLobbyByID(p utils.Passphrase) *lobbies.Lobby {
-	return lobbies.GetLobbyRegistry().GetLobbyByPassphrase(p)
-}
-
-func (u *Usher) AddPlayerToLobbyAndStartGameIfFull(player *chess.Player, lobby *lobbies.Lobby) {
-	lobby.AddPlayerAndStartGameIfFull(player)
-}

utils/passphrase.go

@@ -2,105 +2,56 @@ package utils
 
 import (
 	"strings"
-
-	"github.com/tjarratt/babble"
+	"unicode"
 )
 
 type Passphrase string
 
 func NewPassphrase() Passphrase {
 	var phrase string
-	var retries int
 	var word string
-	var words = 2
+	var words = 3
+
 	//TODO make sure passphrases are unique
 	for words > 0 {
-		retries = 20
-		for {
-			word = getCleanWord()
-			if isAccecpable(word) {
-				phrase = phrase + word + " "
-				break
-			}
-			if retries == 1 { //this is our last try, we take any word
-				phrase = phrase + word + " "
-			}
-			retries -= 1
-		}
+		word = getCleanWord()
+		phrase = phrase + word + " "
 		words -= 1
 	}
 	return Passphrase(strings.TrimSpace(phrase))
 }
 
+func NewPassphraseFromString(s string) Passphrase {
+	return Passphrase(s)
+}
+
+func (p Passphrase) AsURLParam() string {
+	var result string
+	phraseAsString := p.String()
+
+	segments := strings.Split(phraseAsString, " ")
+
+	for _, segment := range segments {
+		runes := []rune(segment)
+		runes[0] = unicode.ToUpper(runes[0])
+		result += string(runes)
+	}
+
+	return result
+}
+
+func ConvertToPassphraseWithSpaces(s string) Passphrase {
+	result := ""
+	for _, rune := range s {
+		if unicode.IsUpper(rune) {
+			result += " "
+		}
+		result += strings.ToLower(string(rune))
+	}
+
+	return NewPassphraseFromString(strings.Trim(result, " "))
+}
+
 func (p Passphrase) String() string {
 	return string(p)
 }
-
-func (p Passphrase) IsEmpty() bool {
-	return p.String() == ""
-}
-
-func isAccecpable(s string) bool {
-	l := len(s)
-	if l > 8 || l < 3 {
-		return false
-	}
-
-	for _, rune := range s {
-		if !isEnglishLetter(rune) {
-			return false
-		}
-	}
-	return true
-}
-
-func isProfanity(s string) bool {
-	contains := []string{
-		"nigg",
-		"fag",
-		"ass",
-		"bitch",
-		"rape",
-		"ass",
-		"scrot",
-		"rect",
-	}
-	startsWith := []string{
-		"spic",
-		"chin",
-		"cunt",
-	}
-
-	for _, word := range contains {
-		if strings.Contains(s, word) {
-			return true
-		}
-	}
-	for _, word := range startsWith {
-		if strings.HasPrefix(s, word) {
-			return true
-		}
-	}
-	return false
-}
-
-func isEnglishLetter(r rune) bool {
-	if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') {
-		return false
-	}
-	return true
-}
-
-func getCleanWord() string {
-	var word string
-
-	babbler := babble.NewBabbler()
-	babbler.Count = 1
-
-	for {
-		word = babbler.Babble()
-		if !isProfanity(word) {
-			return word
-		}
-	}
-}

utils/passphrase_test.go

@@ -0,0 +1,36 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_onlyUniqueWords(t *testing.T) {
+	wordsDistribution := make(map[string]int)
+
+	for _, word := range CleanWords {
+		wordsDistribution[word] += 1
+	}
+
+	for _, v := range wordsDistribution {
+		assert.Equal(t, 1, v)
+	}
+
+	assert.Equal(t, numberOfCleanWords, len(wordsDistribution))
+}
+
+func Test_Passphrase_AsURLParam(t *testing.T) {
+	phrase := NewPassphraseFromString("this is a Test phrase")
+
+	asParams := phrase.AsURLParam()
+
+	assert.Equal(t, "ThisIsATestPhrase", asParams)
+}
+
+func Test_Passphrase_ConvertToPassphraseWithSpaces(t *testing.T) {
+	fromURL := "ThisIsATestPhraseWithManyWords"
+	phrase := ConvertToPassphraseWithSpaces(fromURL)
+
+	assert.Equal(t, NewPassphraseFromString("this is a test phrase with many words"), phrase)
+}