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.sidecar.handlers;
  
  import java.util.Collections;
  import java.util.Set;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  import io.netty.handler.codec.http.HttpResponseStatus;
  import io.vertx.core.http.HttpServerRequest;
  import io.vertx.core.net.SocketAddress;
  import io.vertx.ext.auth.authorization.Authorization;
  import io.vertx.ext.web.RoutingContext;
  import org.apache.cassandra.sidecar.acl.authorization.BasicPermissions;
  import org.apache.cassandra.sidecar.common.server.StorageOperations;
  import org.apache.cassandra.sidecar.common.server.data.Name;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.utils.CassandraInputValidator;
  import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;
  import org.jetbrains.annotations.NotNull;
  
  import static org.apache.cassandra.sidecar.utils.HttpExceptions.wrapHttpException;
  
  /**
   * A handler that provides ring information for a specific keyspace for the Cassandra cluster
   */
  @Singleton
  public class KeyspaceRingHandler extends AbstractHandler<Name> implements AccessProtected
  {
      @Inject
      public KeyspaceRingHandler(InstanceMetadataFetcher metadataFetcher,
                                 ExecutorPools executorPools,
                                 CassandraInputValidator validator)
      {
          super(metadataFetcher, executorPools, validator);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          return Collections.singleton(BasicPermissions.READ_RING_KEYSPACE_SCOPED.toAuthorization());
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void handleInternal(RoutingContext context,
                                 HttpServerRequest httpRequest,
                                 @NotNull String host,
                                 SocketAddress remoteAddress,
                                 Name keyspace)
      {
          StorageOperations operations = metadataFetcher.delegate(host).storageOperations();
          executorPools.service()
                       .executeBlocking(() -> operations.ring(keyspace))
                       .onSuccess(context::json)
                       .onFailure(cause -> processFailure(cause, context, host, remoteAddress, keyspace));
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void processFailure(Throwable cause,
                                    RoutingContext context,
                                    String host,
                                    SocketAddress remoteAddress,
                                    Name keyspace)
      {
          if (cause instanceof IllegalArgumentException &&
              StringUtils.contains(cause.getMessage(), ", does not exist"))
          {
              context.fail(wrapHttpException(HttpResponseStatus.NOT_FOUND, cause.getMessage(), cause));
              return;
          }
  
          super.processFailure(cause, context, host, remoteAddress, keyspace);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected Name extractParamsOrThrow(RoutingContext context)
      {
          return keyspace(context, true);
      }
  }
  