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.bookkeeper.grpc.resolver;
  
  import static org.apache.bookkeeper.util.BookKeeperConstants.AVAILABLE_NODE;
  import static org.junit.Assert.assertEquals;
  
  import io.grpc.Attributes;
  import io.grpc.EquivalentAddressGroup;
  import io.grpc.NameResolver;
  import io.grpc.NameResolver.Listener;
  import io.grpc.Status;
  import io.grpc.SynchronizationContext;
  import io.grpc.internal.GrpcUtil;
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.net.URI;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.stream.Collectors;
  import lombok.Cleanup;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.discover.BookieServiceInfo;
  import org.apache.bookkeeper.discover.RegistrationManager;
  import org.apache.bookkeeper.meta.MetadataBookieDriver;
  import org.apache.bookkeeper.meta.MetadataDrivers;
  import org.apache.bookkeeper.net.BookieId;
  import org.apache.bookkeeper.stats.NullStatsLogger;
  import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.ZooDefs.Ids;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Unit test {@link BKRegistrationNameResolver}.
   */
  public class BKRegistrationNameResolverTest extends BookKeeperClusterTestCase {
  
      private static final String ROOT_PATH = "/resolver-test";
      private static final String SERVERS_PATH = ROOT_PATH + "/servers";
  
      private final BKRegistrationNameResolverProvider resolverProvider;
  
      private MetadataBookieDriver bookieDriver;
      private RegistrationManager regManager;
      private URI serviceUri;
  
      public BKRegistrationNameResolverTest() {
          super(0);
          this.resolverProvider = new BKRegistrationNameResolverProvider();
      }
  
      @Before
      @Override
      public void setUp() throws Exception {
          super.setUp();
  
          zkc.transaction()
              .create(ROOT_PATH, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT)
              .create(SERVERS_PATH, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT)
              .create(SERVERS_PATH + "/" + AVAILABLE_NODE, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT)
              .commit();
  
          serviceUri = URI.create("zk://" + zkUtil.getZooKeeperConnectString() + SERVERS_PATH);
  
  
          ServerConfiguration serverConf = new ServerConfiguration();
          serverConf.setMetadataServiceUri(serviceUri.toString());
          bookieDriver = MetadataDrivers.getBookieDriver(serviceUri);
          bookieDriver.initialize(serverConf, NullStatsLogger.INSTANCE);
          regManager = bookieDriver.createRegistrationManager();
      }
  
      @After
      @Override
      public void tearDown() throws Exception {
          regManager.close();
          bookieDriver.close();
  
          super.tearDown();
      }
  
      @Test
      public void testNameResolver() throws Exception {
          int numServers = 3;
  
          Set<SocketAddress> addressSet = new HashSet<>();
          for (int i = 0; i < numServers; i++) {
              InetSocketAddress address = new InetSocketAddress("127.0.0.1", 3181 + i);
              addressSet.add(address);
              bookieDriver.createRegistrationManager().registerBookie(
                  BookieId.parse("127.0.0.1:" + (3181 + i)), false, BookieServiceInfo.EMPTY
              );
          }
  
          LinkedBlockingQueue<List<EquivalentAddressGroup>> notifications = new LinkedBlockingQueue<>();
  
  
          @Cleanup("shutdown")
          NameResolver resolver = resolverProvider.newNameResolver(serviceUri,
                  NameResolver.Args.newBuilder()
                          .setDefaultPort(0)
                          .setProxyDetector(GrpcUtil.DEFAULT_PROXY_DETECTOR)
                          .setSynchronizationContext(new SynchronizationContext((t, ex) -> {}))
                          .setServiceConfigParser(new NameResolver.ServiceConfigParser() {
                              @Override
                              public NameResolver.ConfigOrError parseServiceConfig(Map<String, ?> rawServiceConfig) {
                                  return null;
                              }
                          })
                          .build());
          resolver.start(new Listener() {
              @Override
              public void onAddresses(List<EquivalentAddressGroup> servers, Attributes attributes) {
                  notifications.add(servers);
              }
  
              @Override
              public void onError(Status error) {
  
              }
          });
  
          List<EquivalentAddressGroup> groups = notifications.take();
          assertEquals(numServers, groups.size());
  
          Set<SocketAddress> receivedSet = groups.stream()
              .map(group -> group.getAddresses().get(0))
              .collect(Collectors.toSet());
          assertEquals(addressSet, receivedSet);
  
          // add 3 more servers
  
          for (int i = numServers; i < 2 * numServers; i++) {
              InetSocketAddress address = new InetSocketAddress("127.0.0.1", 3181 + i);
              addressSet.add(address);
              regManager.registerBookie(
                  BookieId.parse("127.0.0.1:" + (3181 + i)), false, BookieServiceInfo.EMPTY
              );
          }
  
          List<EquivalentAddressGroup> notification = notifications.take();
          while (notification.size() < 2 * numServers) {
              notification = notifications.take();
          }
          assertEquals(2 * numServers, notification.size());
          receivedSet = notification.stream()
              .map(group -> group.getAddresses().get(0))
              .collect(Collectors.toSet());
          assertEquals(addressSet, receivedSet);
      }
  
  }
  