final Set<UUID> getPlayers() {
   ImmutableSet.Builder<UUID> setBuilder = ImmutableSet.builder();
   if (pool != null) {
     try (Jedis rsc = pool.getResource()) {
       List<String> keys = new ArrayList<>();
       for (String i : getServerIds()) {
         keys.add("proxy:" + i + ":usersOnline");
       }
       if (!keys.isEmpty()) {
         Set<String> users = rsc.sunion(keys.toArray(new String[keys.size()]));
         if (users != null && !users.isEmpty()) {
           for (String user : users) {
             try {
               setBuilder = setBuilder.add(UUID.fromString(user));
             } catch (IllegalArgumentException ignored) {
             }
           }
         }
       }
     } catch (JedisConnectionException e) {
       // Redis server has disappeared!
       getLogger()
           .log(
               Level.SEVERE,
               "Unable to get connection from pool - did your Redis server go away?",
               e);
       throw new RuntimeException("Unable to get all players online", e);
     }
   }
   return setBuilder.build();
 }
 private List<String> getCurrentServerIds(boolean nag, boolean lagged) {
   try (Jedis jedis = pool.getResource()) {
     long time = getRedisTime(jedis.time());
     int nagTime = 0;
     if (nag) {
       nagTime = nagAboutServers.decrementAndGet();
       if (nagTime <= 0) {
         nagAboutServers.set(10);
       }
     }
     ImmutableList.Builder<String> servers = ImmutableList.builder();
     Map<String, String> heartbeats = jedis.hgetAll("heartbeats");
     for (Map.Entry<String, String> entry : heartbeats.entrySet()) {
       try {
         long stamp = Long.parseLong(entry.getValue());
         if (lagged ? time >= stamp + 30 : time <= stamp + 30) servers.add(entry.getKey());
         else if (nag && nagTime <= 0) {
           getLogger()
               .severe(
                   entry.getKey()
                       + " is "
                       + (time - stamp)
                       + " seconds behind! (Time not synchronized or server down?)");
         }
       } catch (NumberFormatException ignored) {
       }
     }
     return servers.build();
   } catch (JedisConnectionException e) {
     getLogger().log(Level.SEVERE, "Unable to fetch server IDs", e);
     return Collections.singletonList(configuration.getServerId());
   }
 }
 public Set<UUID> getPlayersOnProxy(String server) {
   checkArgument(getServerIds().contains(server), server + " is not a valid proxy ID");
   try (Jedis jedis = pool.getResource()) {
     Set<String> users = jedis.smembers("proxy:" + server + ":usersOnline");
     ImmutableSet.Builder<UUID> builder = ImmutableSet.builder();
     for (String user : users) {
       builder.add(UUID.fromString(user));
     }
     return builder.build();
   }
 }
  @Override
  public void onDisable() {
    if (pool != null) {
      // Poison the PubSub listener
      psl.poison();
      getProxy().getScheduler().cancel(this);
      integrityCheck.cancel();
      heartbeatTask.cancel();
      getProxy().getPluginManager().unregisterListeners(this);

      try (Jedis tmpRsc = pool.getResource()) {
        tmpRsc.hdel("heartbeats", configuration.getServerId());
        if (tmpRsc.scard("proxy:" + configuration.getServerId() + ":usersOnline") > 0) {
          Set<String> players =
              tmpRsc.smembers("proxy:" + configuration.getServerId() + ":usersOnline");
          for (String member : players) RedisUtil.cleanUpPlayer(member, tmpRsc);
        }
      }

      pool.destroy();
    }
  }
 final void sendChannelMessage(String channel, String message) {
   try (Jedis jedis = pool.getResource()) {
     jedis.publish(channel, message);
   } catch (JedisConnectionException e) {
     // Redis server has disappeared!
     getLogger()
         .log(
             Level.SEVERE,
             "Unable to get connection from pool - did your Redis server go away?",
             e);
     throw new RuntimeException("Unable to publish channel message", e);
   }
 }
  private void loadConfig() throws IOException, JedisConnectionException {
    if (!getDataFolder().exists()) {
      getDataFolder().mkdir();
    }

    File file = new File(getDataFolder(), "config.yml");

    if (!file.exists()) {
      file.createNewFile();
      try (InputStream in = getResourceAsStream("example_config.yml");
          OutputStream out = new FileOutputStream(file)) {
        ByteStreams.copy(in, out);
      }
    }

    final Configuration configuration =
        ConfigurationProvider.getProvider(YamlConfiguration.class).load(file);

    final String redisServer = configuration.getString("redis-server", "localhost");
    final int redisPort = configuration.getInt("redis-port", 6379);
    String redisPassword = configuration.getString("redis-password");
    String serverId = configuration.getString("server-id");

    if (redisPassword != null && (redisPassword.isEmpty() || redisPassword.equals("none"))) {
      redisPassword = null;
    }

    // Configuration sanity checks.
    if (serverId == null || serverId.isEmpty()) {
      throw new RuntimeException("server-id is not specified in the configuration or is empty");
    }

    if (redisServer != null && !redisServer.isEmpty()) {
      final String finalRedisPassword = redisPassword;
      FutureTask<JedisPool> task =
          new FutureTask<>(
              new Callable<JedisPool>() {
                @Override
                public JedisPool call() throws Exception {
                  // With recent versions of Jedis, we must set the classloader to the one
                  // BungeeCord used
                  // to load RedisBungee with.
                  ClassLoader previous = Thread.currentThread().getContextClassLoader();
                  Thread.currentThread().setContextClassLoader(RedisBungee.class.getClassLoader());

                  // Create the pool...
                  JedisPoolConfig config = new JedisPoolConfig();
                  config.setMaxTotal(configuration.getInt("max-redis-connections", 8));
                  JedisPool pool =
                      new JedisPool(config, redisServer, redisPort, 0, finalRedisPassword);

                  // Reset classloader and return the pool
                  Thread.currentThread().setContextClassLoader(previous);
                  return pool;
                }
              });

      getProxy().getScheduler().runAsync(this, task);

      try {
        pool = task.get();
      } catch (InterruptedException | ExecutionException e) {
        throw new RuntimeException("Unable to create Redis pool", e);
      }

      // Test the connection
      try (Jedis rsc = pool.getResource()) {
        rsc.ping();
        // If that worked, now we can check for an existing, alive Bungee:
        File crashFile = new File(getDataFolder(), "restarted_from_crash.txt");
        if (crashFile.exists()) {
          crashFile.delete();
        } else if (rsc.hexists("heartbeats", serverId)) {
          try {
            long value = Long.parseLong(rsc.hget("heartbeats", serverId));
            if (System.currentTimeMillis() < value + 20000) {
              getLogger()
                  .severe(
                      "You have launched a possible impostor BungeeCord instance. Another instance is already running.");
              getLogger()
                  .severe("For data consistency reasons, RedisBungee will now disable itself.");
              getLogger()
                  .severe(
                      "If this instance is coming up from a crash, create a file in your RedisBungee plugins directory with the name 'restarted_from_crash.txt' and RedisBungee will not perform this check.");
              throw new RuntimeException("Possible impostor instance!");
            }
          } catch (NumberFormatException ignored) {
          }
        }

        FutureTask<Void> task2 =
            new FutureTask<>(
                new Callable<Void>() {
                  @Override
                  public Void call() throws Exception {
                    httpClient = new OkHttpClient();
                    Dispatcher dispatcher = new Dispatcher(getExecutorService());
                    httpClient.setDispatcher(dispatcher);
                    NameFetcher.setHttpClient(httpClient);
                    UUIDFetcher.setHttpClient(httpClient);
                    RedisBungee.configuration =
                        new RedisBungeeConfiguration(RedisBungee.this.getPool(), configuration);
                    return null;
                  }
                });

        getProxy().getScheduler().runAsync(this, task2);

        try {
          task2.get();
        } catch (InterruptedException | ExecutionException e) {
          throw new RuntimeException("Unable to create HTTP client", e);
        }

        getLogger().log(Level.INFO, "Successfully connected to Redis.");
      } catch (JedisConnectionException e) {
        pool.destroy();
        pool = null;
        throw e;
      }
    } else {
      throw new RuntimeException("No redis server specified!");
    }
  }
  @Override
  public void onEnable() {
    try {
      loadConfig();
    } catch (IOException e) {
      throw new RuntimeException("Unable to load/save config", e);
    } catch (JedisConnectionException e) {
      throw new RuntimeException("Unable to connect to your Redis server!", e);
    }
    if (pool != null) {
      try (Jedis tmpRsc = pool.getResource()) {
        // This is more portable than INFO <section>
        String info = tmpRsc.info();
        for (String s : info.split("\r\n")) {
          if (s.startsWith("redis_version:")) {
            String version = s.split(":")[1];
            if (!(usingLua = RedisUtil.canUseLua(version))) {
              getLogger()
                  .warning(
                      "Your version of Redis ("
                          + version
                          + ") is not at least version 2.6. RedisBungee requires a newer version of Redis.");
              throw new RuntimeException("Unsupported Redis version detected");
            } else {
              LuaManager manager = new LuaManager(this);
              serverToPlayersScript =
                  manager.createScript(
                      IOUtil.readInputStreamAsString(
                          getResourceAsStream("lua/server_to_players.lua")));
              getPlayerCountScript =
                  manager.createScript(
                      IOUtil.readInputStreamAsString(
                          getResourceAsStream("lua/get_player_count.lua")));
              getServerPlayersScript =
                  manager.createScript(
                      IOUtil.readInputStreamAsString(
                          getResourceAsStream("lua/get_server_players.lua")));
            }
            break;
          }
        }

        tmpRsc.hset(
            "heartbeats", configuration.getServerId(), String.valueOf(System.currentTimeMillis()));

        long uuidCacheSize = tmpRsc.hlen("uuid-cache");
        if (uuidCacheSize > 750000) {
          getLogger()
              .info(
                  "Looks like you have a really big UUID cache! Run https://www.spigotmc.org/resources/redisbungeecleaner.8505/ as soon as possible.");
        }
      }
      serverIds = getCurrentServerIds(true, false);
      uuidTranslator = new UUIDTranslator(this);
      heartbeatTask =
          getProxy()
              .getScheduler()
              .schedule(
                  this,
                  new Runnable() {
                    @Override
                    public void run() {
                      try (Jedis rsc = pool.getResource()) {
                        long redisTime = getRedisTime(rsc.time());
                        rsc.hset(
                            "heartbeats", configuration.getServerId(), String.valueOf(redisTime));
                      } catch (JedisConnectionException e) {
                        // Redis server has disappeared!
                        getLogger()
                            .log(
                                Level.SEVERE,
                                "Unable to update heartbeat - did your Redis server go away?",
                                e);
                      }
                      serverIds = getCurrentServerIds(true, false);
                      globalPlayerCount.set(getCurrentCount());
                    }
                  },
                  0,
                  3,
                  TimeUnit.SECONDS);
      dataManager = new DataManager(this);
      if (configuration.isRegisterBungeeCommands()) {
        getProxy()
            .getPluginManager()
            .registerCommand(this, new RedisBungeeCommands.GlistCommand(this));
        getProxy()
            .getPluginManager()
            .registerCommand(this, new RedisBungeeCommands.FindCommand(this));
        getProxy()
            .getPluginManager()
            .registerCommand(this, new RedisBungeeCommands.LastSeenCommand(this));
        getProxy()
            .getPluginManager()
            .registerCommand(this, new RedisBungeeCommands.IpCommand(this));
      }
      getProxy().getPluginManager().registerCommand(this, new RedisBungeeCommands.SendToAll(this));
      getProxy().getPluginManager().registerCommand(this, new RedisBungeeCommands.ServerId(this));
      getProxy().getPluginManager().registerCommand(this, new RedisBungeeCommands.ServerIds());
      getProxy()
          .getPluginManager()
          .registerCommand(this, new RedisBungeeCommands.PlayerProxyCommand(this));
      getProxy()
          .getPluginManager()
          .registerCommand(this, new RedisBungeeCommands.PlistCommand(this));
      getProxy()
          .getPluginManager()
          .registerCommand(this, new RedisBungeeCommands.DebugCommand(this));
      api = new RedisBungeeAPI(this);
      getProxy()
          .getPluginManager()
          .registerListener(
              this, new RedisBungeeListener(this, configuration.getExemptAddresses()));
      getProxy().getPluginManager().registerListener(this, dataManager);
      psl = new PubSubListener();
      getProxy().getScheduler().runAsync(this, psl);
      integrityCheck =
          getProxy()
              .getScheduler()
              .schedule(
                  this,
                  new Runnable() {
                    @Override
                    public void run() {
                      try (Jedis tmpRsc = pool.getResource()) {
                        Set<String> players = getLocalPlayersAsUuidStrings();
                        Set<String> playersInRedis =
                            tmpRsc.smembers(
                                "proxy:" + configuration.getServerId() + ":usersOnline");
                        List<String> lagged = getCurrentServerIds(false, true);

                        // Clean up lagged players.
                        for (String s : lagged) {
                          Set<String> laggedPlayers =
                              tmpRsc.smembers("proxy:" + s + ":usersOnline");
                          tmpRsc.del("proxy:" + s + ":usersOnline");
                          if (!laggedPlayers.isEmpty()) {
                            getLogger()
                                .info(
                                    "Cleaning up lagged proxy "
                                        + s
                                        + " ("
                                        + laggedPlayers.size()
                                        + " players)...");
                            for (String laggedPlayer : laggedPlayers) {
                              RedisUtil.cleanUpPlayer(laggedPlayer, tmpRsc);
                            }
                          }
                        }

                        for (Iterator<String> it = playersInRedis.iterator(); it.hasNext(); ) {
                          String member = it.next();
                          if (!players.contains(member)) {
                            // Are they simply on a different proxy?
                            String found = null;
                            for (String proxyId : getServerIds()) {
                              if (proxyId.equals(configuration.getServerId())) continue;
                              if (tmpRsc.sismember("proxy:" + proxyId + ":usersOnline", member)) {
                                // Just clean up the set.
                                found = proxyId;
                                break;
                              }
                            }
                            if (found == null) {
                              RedisUtil.cleanUpPlayer(member, tmpRsc);
                              getLogger()
                                  .warning(
                                      "Player found in set that was not found locally and globally: "
                                          + member);
                            } else {
                              tmpRsc.srem(
                                  "proxy:" + configuration.getServerId() + ":usersOnline", member);
                              getLogger()
                                  .warning(
                                      "Player found in set that was not found locally, but is on another proxy: "
                                          + member);
                            }

                            it.remove();
                          }
                        }

                        Pipeline pipeline = tmpRsc.pipelined();

                        for (String player : players) {
                          if (playersInRedis.contains(player)) continue;

                          // Player not online according to Redis but not BungeeCord.
                          getLogger()
                              .warning("Player " + player + " is on the proxy but not in Redis.");

                          ProxiedPlayer proxiedPlayer =
                              ProxyServer.getInstance().getPlayer(UUID.fromString(player));
                          if (proxiedPlayer == null) continue; // We'll deal with it later.

                          RedisUtil.createPlayer(proxiedPlayer, pipeline, true);
                        }

                        pipeline.sync();
                      }
                    }
                  },
                  0,
                  1,
                  TimeUnit.MINUTES);
    }
    getProxy().registerChannel("RedisBungee");
  }