revert(http): restore original RateLimiterServlet implementation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Little-Peony

framework/src/main/java/org/tron/core/services/http/RateLimiterServlet.java

@@ -3,9 +3,7 @@
 import com.google.common.base.Strings;
 import io.prometheus.client.Histogram;
 import java.io.IOException;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.lang.reflect.Constructor;
 import javax.annotation.PostConstruct;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
@@ -33,25 +31,7 @@
 @Slf4j
 public abstract class RateLimiterServlet extends HttpServlet {
   private static final String KEY_PREFIX_HTTP = "http_";
-
-  // Whitelist of allowed rate limiter adapter class names.
-  // Keys are derived from Class.getSimpleName() so they stay in sync if classes are renamed.
-  // Class.forName() is intentionally NOT used; only these pre-approved classes may be loaded.
-  private static final Map<String, Class<? extends IRateLimiter>> ALLOWED_ADAPTERS;
-  private static final String DEFAULT_ADAPTER_NAME = DefaultBaseQqsAdapter.class.getSimpleName();
-
-  static {
-    Map<String, Class<? extends IRateLimiter>> m = new HashMap<>();
-    for (Class<? extends IRateLimiter> c : new Class[]{
-        GlobalPreemptibleAdapter.class,
-        QpsRateLimiterAdapter.class,
-        IPQPSRateLimiterAdapter.class,
-        DefaultBaseQqsAdapter.class
-    }) {
-      m.put(c.getSimpleName(), c);
-    }
-    ALLOWED_ADAPTERS = Collections.unmodifiableMap(m);
-  }
+  private static final String ADAPTER_PREFIX = "org.tron.core.services.ratelimiter.adapter.";
 
   @Autowired
   private RateLimiterContainer container;
@@ -60,22 +40,42 @@ public abstract class RateLimiterServlet extends HttpServlet {
   private void addRateContainer() {
     RateLimiterInitialization.HttpRateLimiterItem item = Args.getInstance()
         .getRateLimiterInitialization().getHttpMap().get(getClass().getSimpleName());
+    boolean success = false;
     final String name = getClass().getSimpleName();
-
-    // If no config for this servlet, fall back to the default adapter.
-    String cName = (item != null) ? item.getStrategy() : DEFAULT_ADAPTER_NAME;
-    String params = (item != null) ? item.getParams() : QpsStrategy.DEFAULT_QPS_PARAM;
-
-    try {
-      Class<? extends IRateLimiter> c = ALLOWED_ADAPTERS.get(cName);
-      if (c == null) {
-        throw new IllegalArgumentException(
-            "Unknown rate limiter adapter (not in whitelist): " + cName);
+    if (item != null) {
+      String cName = "";
+      String params = "";
+      Object obj;
+      try {
+        cName = item.getStrategy();
+        params = item.getParams();
+        // add the specific rate limiter strategy of servlet.
+        Class<?> c = Class.forName(ADAPTER_PREFIX + cName);
+        Constructor constructor;
+        if (c == GlobalPreemptibleAdapter.class || c == QpsRateLimiterAdapter.class
+            || c == IPQPSRateLimiterAdapter.class) {
+          constructor = c.getConstructor(String.class);
+          obj = constructor.newInstance(params);
+          container.add(KEY_PREFIX_HTTP, name, (IRateLimiter) obj);
+        } else {
+          constructor = c.getConstructor();
+          obj = constructor.newInstance(QpsStrategy.DEFAULT_QPS_PARAM);
+          container.add(KEY_PREFIX_HTTP, name, (IRateLimiter) obj);
+        }
+        success = true;
+      } catch (Exception e) {
+        this.throwTronError(cName, params, name, e);
+      }
+    }
+    if (!success) {
+      // if the specific rate limiter strategy of servlet is not defined or fail to add,
+      // then add a default Strategy.
+      try {
+        IRateLimiter rateLimiter = new DefaultBaseQqsAdapter(QpsStrategy.DEFAULT_QPS_PARAM);
+        container.add(KEY_PREFIX_HTTP, name, rateLimiter);
+      } catch (Exception e) {
+        this.throwTronError("DefaultBaseQqsAdapter", QpsStrategy.DEFAULT_QPS_PARAM, name, e);
       }
-      IRateLimiter rateLimiter = (IRateLimiter) c.getConstructor(String.class).newInstance(params);
-      container.add(KEY_PREFIX_HTTP, name, rateLimiter);
-    } catch (Exception e) {
-      this.throwTronError(cName, params, name, e);
     }
   }