Add a rate limit for mojang api requests. Configurable via hidden.yml

src/main/java/com/gmail/nossr50/config/HiddenConfig.java

@@ -6,16 +6,18 @@ import com.gmail.nossr50.mcMMO;
 
 public class HiddenConfig {
     private static HiddenConfig instance;
-    private static String fileName;
-    private static YamlConfiguration config;
-    private static boolean chunkletsEnabled;
-    private static int conversionRate;
-    private static boolean useEnchantmentBuffs;
-    private static boolean resendChunksAfterBlockAbility;
-    private static int uuidConvertAmount;
+    private String fileName;
+    private YamlConfiguration config;
+    private boolean chunkletsEnabled;
+    private int conversionRate;
+    private boolean useEnchantmentBuffs;
+    private boolean resendChunksAfterBlockAbility;
+    private int uuidConvertAmount;
+    private int mojangRateLimit;
+    private long mojangLimitPeriod;
 
     public HiddenConfig(String fileName) {
-        HiddenConfig.fileName = fileName;
+        this.fileName = fileName;
         load();
     }
 
@@ -35,6 +37,8 @@ public class HiddenConfig {
             useEnchantmentBuffs = config.getBoolean("Options.EnchantmentBuffs", true);
             resendChunksAfterBlockAbility = config.getBoolean("Options.RefreshChunks", false);
             uuidConvertAmount = config.getInt("Options.UUIDConvertAmount", 5);
+            mojangRateLimit = config.getInt("Options.MojangRateLimit", 50000);
+            mojangLimitPeriod = config.getLong("Options.MojangLimitPeriod", 600000);
         }
     }
 
@@ -57,4 +61,12 @@ public class HiddenConfig {
     public int getUUIDConvertAmount() {
         return uuidConvertAmount;
     }
+
+    public int getMojangRateLimit() {
+        return mojangRateLimit;
+    }
+
+    public long getMojangLimitPeriod() {
+        return mojangLimitPeriod;
+    }
 }

src/main/java/com/gmail/nossr50/runnables/database/UUIDUpdateAsyncTask.java

@@ -18,6 +18,8 @@ import com.gmail.nossr50.util.uuid.UUIDFetcher;
 public class UUIDUpdateAsyncTask extends BukkitRunnable {
     private mcMMO plugin;
     private static final int MAX_LOOKUP = Math.max(HiddenConfig.getInstance().getUUIDConvertAmount(), 100);
+    private static final int RATE_LIMIT = HiddenConfig.getInstance().getMojangRateLimit();
+    private static final long LIMIT_PERIOD = HiddenConfig.getInstance().getMojangLimitPeriod();
     private static final int BATCH_SIZE = 5000;
 
     private List<String> userNames;
@@ -43,6 +45,16 @@ public class UUIDUpdateAsyncTask extends BukkitRunnable {
         Map<String, UUID> fetchedUUIDs = new HashMap<String, UUID>();
 
         while (size != 0) {
+            if (checkedUsers + 100 > RATE_LIMIT) {
+                try {
+                    Thread.sleep(LIMIT_PERIOD);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                    return;
+                }
+                startMillis = System.currentTimeMillis();
+                checkedUsers = 0;
+            }
             if (size > MAX_LOOKUP) {
                 userNamesSection = userNames.subList(size - MAX_LOOKUP, size);
                 size -= MAX_LOOKUP;

src/main/resources/hidden.yml

@@ -14,3 +14,8 @@ Options:
 
     # Amount of users to convert every interval
     UUIDConvertAmount: 100
+    # Amount of users to be converted at a time before waiting MojangLimitPeriod milliseconds to begin again
+    # This setting is for large servers to avoid being temp banned from mojang api
+    MojangRateLimit: 50000
+    # Amount of time to wait after hitting the MojangRateLimit in UUID conversion
+    MojangLimitPeriod: 600000