public GameLobby Read(string gameType, string lobbyId)
{
new ValidationCheck()
.Assert(ValidationCheck.BasicStringCheck(gameType, nameof(gameType)))
.Assert(ValidationCheck.BasicStringCheck(lobbyId, nameof(lobbyId)))
.Throw();
string lobbyKey = CreateKey(gameType, lobbyId);
using (var r = new RedisClient(this.opt))
{
var p = new RedisPipeline()
.Send(RedisCommand.GET, lobbyKey)
.Send(RedisCommand.EXPIRE, lobbyKey);
Stopwatch sw = new Stopwatch();
sw.Start();
var foundGame = r.Send(p);
this.publishTimingStats(redisCategory, sw.ElapsedMilliseconds);
if (foundGame[0] == null)
{
throw new LobbyException(404, "lobby does not exist");
}
string lobbyStr = Encoding.UTF8.GetString(foundGame[0]);
GameLobby gl = JsonConvert.DeserializeObject <GameLobby>(lobbyStr);
return(gl);
}
}
public GameLobby Join(string gameType, string lobbyId, string ip, int port, string name)
{
new ValidationCheck()
.Assert(ValidationCheck.BasicStringCheck(gameType, nameof(gameType)))
.Assert(ValidationCheck.BasicStringCheck(lobbyId, nameof(lobbyId)))
.Assert(ValidationCheck.BasicStringCheck(name, nameof(name)))
.Assert(ValidationCheck.BasicStringCheck(ip, nameof(ip)))
.Assert(port > 1024, nameof(port) + " is privileged")
.Throw();
gameType = gameType.ToUpperInvariant();
lobbyId = lobbyId.ToUpperInvariant();
Client client = new Client();
client.port = port;
client.name = name;
client.ip = ip;
string lobbyKey = CreateKey(gameType, lobbyId);
using (var r = new RedisClient(this.opt))
{
Stopwatch sw = new Stopwatch();
sw.Start();
var foundGame = r.Send(RedisCommand.GET, lobbyKey);
sw.Stop();
if (foundGame == null)
{
throw new LobbyException(404, "lobby does not exist");
}
string lobbyStr = Encoding.UTF8.GetString(foundGame);
GameLobby gl = JsonConvert.DeserializeObject <GameLobby>(lobbyStr);
new ValidationCheck()
.Assert(gl.host.uid != client.uid, "host can't join her own game")
.Assert(gl.clients.All(c => c.uid != client.uid), "already joined")
.Assert(gl.clients.All(c => c.name != client.name), "must provide a unique name")
.Assert(gl.gameType == gameType, "lobby type changed")
.Assert(gl.lobbyId == lobbyId, "lobby id changed")
.Assert(gl.clients.Count <= maxLobbySize, "lobby is full (" + maxLobbySize + ")")
.Throw();
gl.clients.Add(client);
sw.Start();
var resp = r.Send(RedisCommand.SET, lobbyKey, JsonConvert.SerializeObject(gl), "XX", "EX", ExpirationTimeSec);
this.publishTimingStats(redisCategory, sw.ElapsedMilliseconds);
if (resp == null)
{
throw new LobbyException(404, "lobby no longer exists");
}
return(gl);
}
}
public GameLobby Create(string gameType, string ip, int port, string name, bool hidden, Dictionary <string, string> meta)
{
new ValidationCheck()
.Assert(ValidationCheck.BasicStringCheck(gameType, nameof(gameType)))
.Assert(ValidationCheck.BasicStringCheck(ip, nameof(ip)))
.Assert(ValidationCheck.BasicStringCheck(name, nameof(name)))
.Assert(port > 1024, nameof(port) + " is privileged")
.Throw();
gameType = gameType.ToUpperInvariant().Trim();
ip = ip.ToUpperInvariant().Trim();
using (var r = new RedisClient(this.opt))
{
GameLobby gl = new GameLobby();
gl.clients = new List <Client>();
gl.creationTime = DateTime.UtcNow;
gl.host = new Client();
gl.host.port = port;
gl.host.name = name;
gl.host.ip = ip;
gl.gameType = gameType;
gl.hidden = hidden;
// The lobbyID is very much a magic string, and care
// should be taken if you mess with it.
// Redis search methods depend on it being a certain
// format: "gameType-[s]shortId"
gl.lobbyId = IdGenerator.GetId(hidden);
gl.metaData = meta ?? new Dictionary <string, string>();
string lobbyKey = CreateKey(gl.gameType, gl.lobbyId);
var pipe = new RedisPipeline()
// only allow one game to be hosted per IP address
.Send(RedisCommand.EVAL, EnsureSingleLua, "2", hostPrefix + gl.host.ip, lobbyKey)
// actually create the lobby
.Send(RedisCommand.SET, lobbyKey, JsonConvert.SerializeObject(gl), "NX", "EX", ExpirationTimeSec);
Stopwatch sw = new Stopwatch();
sw.Start();
var resp = r.Send(pipe);
this.publishTimingStats(redisCategory, sw.ElapsedMilliseconds);
if (resp[1] == null)
{
throw new LobbyException(500, "lobby already exists");
}
return(gl);
}
}
public ValidationCheck Assert(ValidationCheck check)
{
if (check.result)
{
return(this);
}
else
{
this.result = false;
this.reason.Add(check.reason);
return(this);
}
}
/// <summary>
/// get a list of lobbies for a gametype.
/// hidden games will not be returned
/// </summary>
/// <param name="gameType">gametype to search</param>
/// <param name="metaKey">optional metadata key filter. the key must exist</param>
/// <param name="metaValue">optional metadata value filter. the value must match for the given key.</param>
/// <returns></returns>
public List <GameLobby> Search(string gameType, string metaKey = null, string metaValue = null)
{
new ValidationCheck()
.Assert(ValidationCheck.BasicStringCheck(gameType, nameof(gameType)))
.Throw();
gameType = gameType.ToUpperInvariant();
// As it stands now, this search method will not scale well when there are many instances
// of lobbies for the same game. maxSearchReturnSize*keyMult games are pulled first,
// and then those are filtered by metaKey and metaValue. If none of those games in that
// first scan match, then no games will be returned.
// If this ever becomes a problem, I could create additional keys for metadata
// inside Redis and use pattern matching SCAN on those keys. This just opens me up
// to requiring a much larger redis instance, though, unless I want to further restrict
// metaData.
int keyMult = 1;
Func <Dictionary <string, string>, bool> matches = (d) => true;
if (!string.IsNullOrWhiteSpace(metaKey))
{
keyMult = 10;
if (!string.IsNullOrWhiteSpace(metaValue))
{
matches = (d) => d != null && d.ContainsKey(metaKey) && string.Equals(d[metaKey], metaValue);
}
else
{
matches = (d) => d != null && d.ContainsKey(metaKey);
}
}
var foundGames = new List <GameLobby>();
RedisPipeline pipe = new RedisPipeline();
using (var r = new RedisClient(this.opt))
{
// get initial set of keys
Stopwatch sw = new Stopwatch();
sw.Start();
foreach (var searchRes in r.Scan(RedisCommand.SCAN, lobbyPrefix + gameType + "-[^" + SecretPrefix.ToString() + "]*"))
{
foreach (var key in searchRes)
{
// build up messages to get more data
pipe.Send(RedisCommand.GET, key);
if (pipe.Length >= maxSearchReturnSize * keyMult)
{
break;
}
}
if (pipe.Length >= maxSearchReturnSize * keyMult)
{
break;
}
}
// get lobby data
var readDetails = r.Send(pipe);
this.publishTimingStats(redisCategory, sw.ElapsedMilliseconds);
foreach (var lobby in readDetails)
{
string lobbyStr = Encoding.UTF8.GetString(lobby);
GameLobby gl = JsonConvert.DeserializeObject <GameLobby>(lobbyStr);
if (matches(gl.metaData) && (gl.gameType == gameType))
{
foundGames.Add(gl);
}
if (foundGames.Count >= maxSearchReturnSize)
{
break;
}
}
}
if (foundGames.Count == 0)
{
throw new LobbyException(404, "no games match search parameters");
}
return(foundGames);
}
public GameLobby Leave(string gameType, string lobbyId, string callingIp, string kickName = null)
{
new ValidationCheck()
.Assert(ValidationCheck.BasicStringCheck(gameType, nameof(gameType)))
.Assert(ValidationCheck.BasicStringCheck(lobbyId, nameof(lobbyId)))
.Assert(ValidationCheck.BasicStringCheck(kickName, nameof(kickName)))
.Assert(ValidationCheck.BasicStringCheck(callingIp, nameof(callingIp)))
.Throw();
gameType = gameType.ToUpperInvariant();
lobbyId = lobbyId.ToUpperInvariant();
// unlike other methods, the Host can force a different user to Leave
string lobbyKey = CreateKey(gameType, lobbyId);
using (var r = new RedisClient(this.opt))
{
Stopwatch sw = new Stopwatch();
sw.Start();
var foundGame = r.Send(RedisCommand.GET, lobbyKey);
sw.Stop();
if (foundGame == null)
{
throw new LobbyException(404, "lobby does not exist");
}
string lobbyStr = Encoding.UTF8.GetString(foundGame);
GameLobby gl = JsonConvert.DeserializeObject <GameLobby>(lobbyStr);
new ValidationCheck()
.Assert(gl.lobbyId == lobbyId, "lobby id changed")
.Assert(gl.gameType == gameType, "gametype changed")
.Throw();
// Determine the client of the caller
Client caller = gl.clients
.Concat(new Client[] { gl.host })
.First(c => string.Equals(c.ip, callingIp, StringComparison.InvariantCultureIgnoreCase));
// Determine who is being kicked. If kickName is null, assume the caller is leaving.
Client kickee = caller;
if (!string.IsNullOrWhiteSpace(kickName))
{
kickee = gl.clients
.Concat(new Client[] { gl.host })
.FirstOrDefault(c => string.Equals(c.name, kickName, StringComparison.InvariantCultureIgnoreCase));
}
new ValidationCheck()
.Assert(caller != null, "caller must be in the client list")
.Assert(kickee != null, "client to kick must be in the client list")
.Throw();
// Caller is the host and is leaving their own game
if ((gl.host == caller) && (gl.host == kickee))
{
sw.Start();
r.Send(RedisCommand.DEL, lobbyKey);
sw.Stop();
}
// Host is kicking someone or someone volunteered to leave
else if ((gl.host == caller) || (kickee == caller))
{
gl.clients.RemoveAll(c => string.Equals(c.name, kickName, StringComparison.InvariantCultureIgnoreCase));
sw.Start();
var resp = r.Send(RedisCommand.SET, lobbyKey, JsonConvert.SerializeObject(gl), "XX", "EX", ExpirationTimeSec);
sw.Stop();
if (resp == null)
{
throw new LobbyException(404, "lobby no longer exists");
}
}
else
{
throw new LobbyException(403, "only the host can kick other users");
}
this.publishTimingStats(redisCategory, sw.ElapsedMilliseconds);
return(gl);
}
}
