public virtual async Task JoinAsync(Game.JoinCommand command, CancellationToken cancellationToken = default)
{
var(session, id, join) = command;
var context = CommandContext.GetCurrent();
var user = await AuthService.GetUserAsync(session, cancellationToken);
user = user.MustBeAuthenticated();
var userId = long.Parse(user.Id);
await using var dbContext = await CreateCommandDbContextAsync(cancellationToken);
var dbGame = await GetDbGame(dbContext, id, cancellationToken);
var game = dbGame.ToModel();
var engine = GameEngines[game.EngineId];
if (game.Stage != GameStage.New)
{
throw new InvalidOperationException("Game has already been started.");
}
if (join)
{
if (game.Players.Any(p => p.UserId == userId))
{
throw new InvalidOperationException("You've already joined this game.");
}
if (game.Players.Count > engine.MaxPlayerCount)
{
throw new InvalidOperationException("You can't join this game: there too many players already.");
}
game = game with {
Players = game.Players.Add(new GamePlayer(userId))
};
}
else // Leave
{
var leftPlayer = game.Players.SingleOrDefault(p => p.UserId == userId);
if (leftPlayer == null)
{
throw new InvalidOperationException("You've already left this game.");
}
game = game with {
Players = game.Players.Remove(leftPlayer)
};
context.Operation().Items.Set(leftPlayer);
}
dbGame.UpdateFrom(game);
await dbContext.SaveChangesAsync(cancellationToken);
context.Operation().Items.Set(game);
// Try auto-start
if (join && engine.AutoStart && game.Players.Count == engine.MaxPlayerCount)
{
await StartAsync(new Game.StartCommand(session, id), cancellationToken);
}
}
public Task Join([FromBody] Game.JoinCommand command, CancellationToken cancellationToken = default)
{
command.UseDefaultSession(SessionResolver);
return(Games.Join(command, cancellationToken));
}
