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.livemigration;
  
  import java.io.IOException;
  import java.util.Set;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Inject;
  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.cluster.instance.InstanceMetadata;
  import org.apache.cassandra.sidecar.common.response.InstanceFilesListResponse;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.config.SidecarConfiguration;
  import org.apache.cassandra.sidecar.handlers.AbstractHandler;
  import org.apache.cassandra.sidecar.handlers.AccessProtected;
  import org.apache.cassandra.sidecar.livemigration.CassandraInstanceFiles;
  import org.apache.cassandra.sidecar.livemigration.CassandraInstanceFilesImpl;
  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;
  
  /**
   * Endpoint for returning list of files that a destination instance can copy.
   */
  public class LiveMigrationListInstanceFilesHandler extends AbstractHandler<Void> implements AccessProtected
  {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(LiveMigrationListInstanceFilesHandler.class);
      private final SidecarConfiguration sidecarConfiguration;
  
      @Inject
      public LiveMigrationListInstanceFilesHandler(InstanceMetadataFetcher metadataFetcher,
                                                   ExecutorPools executorPools,
                                                   CassandraInputValidator validator,
                                                   SidecarConfiguration sidecarConfiguration)
      {
          super(metadataFetcher, executorPools, validator);
          this.sidecarConfiguration = sidecarConfiguration;
      }
  
      @Override
      protected Void extractParamsOrThrow(RoutingContext context)
      {
          return null;
      }
  
      @Override
      protected void handleInternal(RoutingContext context, HttpServerRequest httpRequest, @NotNull String host,
                                    SocketAddress remoteAddress, Void request)
      {
          InstanceMetadata instanceMetadata = metadataFetcher.instance(host);
  
          CassandraInstanceFiles filesList = new CassandraInstanceFilesImpl(instanceMetadata,
                                                                            sidecarConfiguration.liveMigrationConfiguration());
          executorPools.service().runBlocking(() -> {
              try
              {
  
                  context.json(new InstanceFilesListResponse(filesList.files()));
              }
              catch (IOException e)
              {
                  LOGGER.error("Could not fetch instance files information.", e);
                  context.fail(wrapHttpException(HttpResponseStatus.INTERNAL_SERVER_ERROR, e.getMessage(), e));
              }
          });
      }
  
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          return Set.of(BasicPermissions.LIST_FILES.toAuthorization());
      }
  }
  