content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.cassandra.db.virtual;
  
  import java.lang.reflect.Field;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  import com.datastax.driver.core.ResultSet;
  import com.datastax.driver.core.Row;
  import org.apache.cassandra.cql3.CQLTester;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.Maps;
  
  // checkstyle: suppress below 'blockSystemPropertyUsage'
  
  public class SystemPropertiesTableTest extends CQLTester
  {
      private static final String KS_NAME = "vts";
      private static final Map<String, String> ORIGINAL_ENV_MAP = System.getenv();
      private static final String TEST_PROP = "cassandra.SystemPropertiesTableTest";
  
      private SystemPropertiesTable table;
  
      @Before
      public void config()
      {
          table = new SystemPropertiesTable(KS_NAME);
          VirtualKeyspaceRegistry.instance.register(new VirtualKeyspace(KS_NAME, ImmutableList.of(table)));
          disablePreparedReuseForTest();
      }
  
      @Test
      public void testSelectAll() throws Throwable
      {
          ResultSet result = executeNet("SELECT * FROM vts.system_properties");
  
          for (Row r : result)
              Assert.assertEquals(System.getProperty(r.getString("name"), System.getenv(r.getString("name"))), r.getString("value"));
      }
  
      @Test
      public void testSelectPartition() throws Throwable
      {
          List<String> properties = Stream.concat(System.getProperties().stringPropertyNames().stream(),
                                                  System.getenv().keySet().stream())
                                          .filter(name -> SystemPropertiesTable.isCassandraRelevant(name))
                                          .collect(Collectors.toList());
  
          for (String property : properties)
          {
              String q = "SELECT * FROM vts.system_properties WHERE name = '" + property + '\'';
              assertRowsNet(executeNet(q), new Object[] {property, System.getProperty(property, System.getenv(property))});
          }
      }
  
      @Test
      public void testSelectEmpty() throws Throwable
      {
          String q = "SELECT * FROM vts.system_properties WHERE name = 'EMPTY'";
          assertRowsNet(executeNet(q));
      }
  
      @Test
      public void testSelectProperty() throws Throwable
      {
          try
          {
              String value = "test_value";
              System.setProperty(TEST_PROP, value);
              String q = String.format("SELECT * FROM vts.system_properties WHERE name = '%s'", TEST_PROP);
              assertRowsNet(executeNet(q), new Object[] {TEST_PROP, value});
          }
          finally
          {
              System.clearProperty(TEST_PROP);
          }
      }
  
      @Test
      public void testSelectEnv() throws Throwable
      {
          try
          {
              String value = "test_value";
              addEnv(TEST_PROP, value);
              String q = String.format("SELECT * FROM vts.system_properties WHERE name = '%s'", TEST_PROP);
              assertRowsNet(executeNet(q), new Object[] {TEST_PROP, value});
          }
          finally
          {
              resetEnv();
          }
      }
  
      @Test
      public void testSelectPropertyOverEnv() throws Throwable
      {
          try
          {
              String value = "test_value";
              System.setProperty(TEST_PROP, value);
              addEnv(TEST_PROP, "wrong_value");
              String q = String.format("SELECT * FROM vts.system_properties WHERE name = '%s'", TEST_PROP);
              assertRowsNet(executeNet(q), new Object[] {TEST_PROP, value});
          }
          finally
          {
              System.clearProperty(TEST_PROP);
              resetEnv();
          }
      }
  
      private static void addEnv(String env, String value) throws ReflectiveOperationException
      {
          Map<String, String> envMap = Maps.newConcurrentMap();
          envMap.putAll(System.getenv());
          envMap.put(env, value);
          setEnv(envMap);
      }
  
      private static void resetEnv() throws ReflectiveOperationException
      {
          setEnv(ORIGINAL_ENV_MAP);
      }
  
      private static void setEnv(Map<String, String> newenv) throws ReflectiveOperationException
      {
          try
          {
              Class<?> cls = Class.forName("java.lang.ProcessEnvironment");
              Field field = cls.getDeclaredField("theEnvironment");
              field.setAccessible(true);
              Map<String, String> envMap = (Map<String, String>) field.get(null);
              envMap.clear();
              envMap.putAll(newenv);
              field = cls.getDeclaredField("theCaseInsensitiveEnvironment");
              field.setAccessible(true);
              envMap = (Map<String, String>) field.get(null);
              envMap.clear();
              envMap.putAll(newenv);
          }
          catch (NoSuchFieldException ignore)
          {
              Class[] classes = Collections.class.getDeclaredClasses();
              Map<String, String> envMap = System.getenv();
              for(Class cl : classes) {
                  if("java.util.Collections$UnmodifiableMap".equals(cl.getName()))
                  {
                      Field field = cl.getDeclaredField("m");
                      field.setAccessible(true);
                      Object obj = field.get(envMap);
                      envMap = (Map<String, String>) obj;
                      envMap.clear();
                      envMap.putAll(newenv);
                  }
              }
          }
      }
  }
  