skeleton move timer

For #11.

game.go

@@ -68,7 +68,10 @@ func gameActor(ctx context.Context, g *game.Match, dealer, chall person, join <-
 	go playerActor(ctx, chall, actions)
 
 	slog.InfoContext(ctx, "start game", "dealer", dealer.id, "challenger", chall.id)
-	broadcast(ctx, g, dealer, chall, obs)
+	const timeLimit = 15 * time.Second
+	dl := time.Now().Add(timeLimit)
+	broadcast(ctx, g, dealer, chall, obs, dl)
+	tick := time.NewTicker(timeLimit)
 	for {
 		select {
 		case <-ctx.Done():
@@ -76,7 +79,7 @@ func gameActor(ctx context.Context, g *game.Match, dealer, chall person, join <-
 		case p := <-join:
 			slog.InfoContext(ctx, "observer", "id", p.id)
 			// Deliver the game state just to the new observer.
-			if err := wsjson.Write(ctx, p.conn, g.DTO(p.id)); err != nil {
+			if err := wsjson.Write(ctx, p.conn, g.DTO(p.id, dl)); err != nil {
 				// We don't need to track them as an observer. Just close their
 				// conn and move on.
 				go p.conn.Close(websocket.StatusNormalClosure, "looks like you dropped")
@@ -89,27 +92,35 @@ func gameActor(ctx context.Context, g *game.Match, dealer, chall person, join <-
 			err := applyAction(g, a)
 			switch err {
 			case nil:
-				broadcast(ctx, g, dealer, chall, obs)
+				broadcast(ctx, g, dealer, chall, obs, dl)
 			case game.ErrRoundEnded:
-				broadcast(ctx, g, dealer, chall, obs)
+				broadcast(ctx, g, dealer, chall, obs, dl)
 				if g.MatchWinner() != nil {
 					gameOver(ctx, dealer, chall, obs)
 					// TODO(zeph): server needs to know the players are gone
 					return
 				}
 				g.NextRound()
-				broadcast(ctx, g, dealer, chall, obs)
+				broadcast(ctx, g, dealer, chall, obs, dl)
 			case game.ErrGameEnded:
-				broadcast(ctx, g, dealer, chall, obs)
+				broadcast(ctx, g, dealer, chall, obs, dl)
 				g.NextGame()
-				broadcast(ctx, g, dealer, chall, obs)
+				broadcast(ctx, g, dealer, chall, obs, dl)
 			case game.ErrWrongTurn:
 				slog.WarnContext(ctx, "action on wrong turn", "from", a.Player, "action", a.Action)
+				continue
 			case errWeirdAction:
 				slog.WarnContext(ctx, "nonsense action", "from", a.Player, "action", a.Action)
+				continue
 			default:
 				slog.ErrorContext(ctx, "action caused a mystery error", "from", a.Player, "action", a.Action, "err", err.Error())
+				continue
 			}
+			dl = time.Now().Add(timeLimit)
+			tick.Reset(timeLimit)
+		case <-tick.C:
+			slog.InfoContext(ctx, "out of time")
+			// TODO(zeph): current player concedes
 		}
 		// Clear observers who have left.
 		for k := len(obs) - 1; k >= 0; k-- {
@@ -145,21 +156,21 @@ func playerActor(ctx context.Context, p person, actions chan<- action) {
 	}
 }
 
-func broadcast(ctx context.Context, g *game.Match, dealer, chall person, obs []observer) {
+func broadcast(ctx context.Context, g *game.Match, dealer, chall person, obs []observer, deadline time.Time) {
 	// TODO(zeph): this probably should return an error or some other signal
 	// if a player drops so that the actor knows to quit
-	if err := wsjson.Write(ctx, dealer.conn, g.DTO(dealer.id)); err != nil {
+	if err := wsjson.Write(ctx, dealer.conn, g.DTO(dealer.id, deadline)); err != nil {
 		// TODO(zeph): concede, but we need to be careful not to recurse
 		slog.WarnContext(ctx, "lost dealer", "player", dealer.id, "err", err.Error())
 	}
-	if err := wsjson.Write(ctx, chall.conn, g.DTO(chall.id)); err != nil {
+	if err := wsjson.Write(ctx, chall.conn, g.DTO(chall.id, deadline)); err != nil {
 		// TODO(zeph): concede, but we need to be careful not to recurse
 		slog.WarnContext(ctx, "lost challenger", "player", chall.id, "err", err.Error())
 	}
 	if len(obs) == 0 {
 		return
 	}
-	d := g.DTO(player.ID{})
+	d := g.DTO(player.ID{}, deadline)
 	for _, p := range obs {
 		if err := wsjson.Write(ctx, p.conn, &d); err != nil {
 			slog.WarnContext(ctx, "lost observer", "err", err.Error())

game/game.go

@@ -11,6 +11,7 @@ package game
 
 import (
 	"errors"
+	"time"
 
 	"git.sunturtle.xyz/studio/shotgun/player"
 	"git.sunturtle.xyz/studio/shotgun/serve"
@@ -239,8 +240,9 @@ func (g *Match) Concede(id player.ID) error {
 	return ErrRoundEnded
 }
 
-// DTO returns the current match state as viewed by the given player.
-func (g *Match) DTO(id player.ID) serve.Game {
+// DTO returns the current match state as viewed by the given player and with
+// the given deadline on the current player's next move.
+func (g *Match) DTO(id player.ID, deadline time.Time) serve.Game {
 	var live, blank int
 	if g.action.gameStart() {
 		live = len(g.shells) / 2
@@ -265,6 +267,7 @@ func (g *Match) DTO(id player.ID) serve.Game {
 		Damage:   g.damage,
 		Shell:    g.Peek(id),
 		Previous: g.prev,
+		Deadline: time.Now().UnixMilli(),
 		Live:     live,
 		Blank:    blank,
 	}

game/game_test.go

@@ -2,6 +2,7 @@ package game
 
 import (
 	"testing"
+	"time"
 
 	"github.com/google/uuid"
 
@@ -455,13 +456,13 @@ func TestGameDTO(t *testing.T) {
 			Live:     len(g.shells) / 2,
 			Blank:    (len(g.shells) + 1) / 2,
 		}
-		if got := g.DTO(dealer); want != got {
+		if got := g.DTO(dealer, time.UnixMilli(0)); want != got {
 			t.Errorf("dealer sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
-		if got := g.DTO(chall); want != got {
+		if got := g.DTO(chall, time.UnixMilli(0)); want != got {
 			t.Errorf("challenger sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
-		if got := g.DTO(player.ID{}); want != got {
+		if got := g.DTO(player.ID{}, time.UnixMilli(0)); want != got {
 			t.Errorf("observer sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
 	}
@@ -481,13 +482,13 @@ func TestGameDTO(t *testing.T) {
 			Live:     0,
 			Blank:    0,
 		}
-		if got := g.DTO(dealer); want != got {
+		if got := g.DTO(dealer, time.UnixMilli(0)); want != got {
 			t.Errorf("dealer sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
-		if got := g.DTO(chall); want != got {
+		if got := g.DTO(chall, time.UnixMilli(0)); want != got {
 			t.Errorf("challenger sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
-		if got := g.DTO(player.ID{}); want != got {
+		if got := g.DTO(player.ID{}, time.UnixMilli(0)); want != got {
 			t.Errorf("observer sees the wrong thing:\nwant %+v\ngot  %+v", want, got)
 		}
 	}

serve/dto.go

@@ -23,6 +23,9 @@ type Game struct {
 	Shell *bool `json:"shell,omitempty"`
 	// Previous gives whether the previously discharged shell was live.
 	Previous *bool `json:"previous"`
+	// Deadline is the deadline on the current player's move in milliseconds
+	// since the Unix epoch.
+	Deadline int64 `json:"deadline"`
 	// Live is the number of live shells this round, if it is the first turn
 	// of the round.
 	Live int `json:"live,omitempty"`