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 com.google.inject.Inject;
  import io.vertx.core.http.HttpServerRequest;
  import io.vertx.core.net.SocketAddress;
  import io.vertx.ext.auth.authorization.Authorization;
  import io.vertx.ext.auth.authorization.OrAuthorization;
  import io.vertx.ext.web.RoutingContext;
  import org.apache.cassandra.sidecar.acl.authorization.BasicPermissions;
  import org.apache.cassandra.sidecar.common.server.MetricsOperations;
  import org.apache.cassandra.sidecar.common.server.data.QualifiedTableName;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.utils.CassandraInputValidator;
  import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;
  
  /**
   * Handler for retrieving table stats
   */
  public class TableStatsHandler extends AbstractHandler<QualifiedTableName> implements AccessProtected
  {
  
      /**
       * Constructs a handler with the provided {@code metadataFetcher}
       *
       * @param metadataFetcher the metadata fetcher
       * @param executorPools   executor pools for blocking executions
       */
      @Inject
      protected TableStatsHandler(InstanceMetadataFetcher metadataFetcher,
                                  ExecutorPools executorPools,
                                  CassandraInputValidator validator)
      {
          super(metadataFetcher, executorPools, validator);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          OrAuthorization authorization = OrAuthorization.create();
          authorization.addAuthorization(BasicPermissions.STATS_TABLE_SCOPED.toAuthorization());
          authorization.addAuthorization(BasicPermissions.STATS_CLUSTER_SCOPED.toAuthorization());
          return Collections.singleton(authorization);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void handleInternal(RoutingContext context, HttpServerRequest httpRequest, String host, SocketAddress remoteAddress, QualifiedTableName tableName)
      {
          MetricsOperations operations = metadataFetcher.delegate(host).metricsOperations();
          executorPools.service()
                       .executeBlocking(() -> operations.tableStats(tableName))
                       .onSuccess(context::json)
                       .onFailure(cause -> processFailure(cause, context, host, remoteAddress, tableName));
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected QualifiedTableName extractParamsOrThrow(RoutingContext context)
      {
          return qualifiedTableName(context);
      }
  }
  