Line data    Source code

       1             : // Copyright (C) 2019 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.rules;
      16             : 
      17             : import org.eclipse.jgit.lib.Config;
      18             : 
      19             : /** Provides utility methods for configuring and running Prolog rules inside Gerrit. */
      20           0 : public class RuleUtil {
      21             : 
      22             :   /**
      23             :    * Returns the reduction limit to be applied to the Prolog machine to prevent infinite loops and
      24             :    * other forms of computational overflow.
      25             :    */
      26             :   public static int reductionLimit(Config gerritConfig) {
      27         147 :     int limit = gerritConfig.getInt("rules", null, "reductionLimit", 100000);
      28         147 :     return limit <= 0 ? Integer.MAX_VALUE : limit;
      29             :   }
      30             : 
      31             :   /**
      32             :    * Returns the compile reduction limit to be applied to the Prolog machine to prevent infinite
      33             :    * loops and other forms of computational overflow. The compiled reduction limit should be used
      34             :    * when user-provided Prolog code is compiled by the interpreter before the limit gets applied.
      35             :    */
      36             :   public static int compileReductionLimit(Config gerritConfig) {
      37         147 :     int limit =
      38         147 :         gerritConfig.getInt(
      39             :             "rules",
      40             :             null,
      41             :             "compileReductionLimit",
      42         147 :             (int) Math.min(10L * reductionLimit(gerritConfig), Integer.MAX_VALUE));
      43         147 :     return limit <= 0 ? Integer.MAX_VALUE : limit;
      44             :   }
      45             : }