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.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.json.DecodeException;
  import io.vertx.core.json.Json;
  import io.vertx.core.json.JsonObject;
  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.ApiEndpointsV1;
  import org.apache.cassandra.sidecar.common.request.LiveMigrationDataCopyRequest;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.exceptions.LiveMigrationExceptions.LiveMigrationDataCopyInProgressException;
  import org.apache.cassandra.sidecar.exceptions.LiveMigrationExceptions.LiveMigrationInvalidRequestException;
  import org.apache.cassandra.sidecar.handlers.AbstractHandler;
  import org.apache.cassandra.sidecar.handlers.AccessProtected;
  import org.apache.cassandra.sidecar.livemigration.DataCopyTaskManager;
  import org.apache.cassandra.sidecar.livemigration.LiveMigrationTask;
  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;
  
  /**
   * Handler for creating data copy tasks for live migration between Cassandra instances.
   * <p>
   * This handler processes requests to initiate data copying from a source Cassandra instance to a destination instance.
   * Data copy tasks must be submitted to the destination Sidecar instance. When a task is accepted,
   * this handler responds with HTTP 202 ACCEPTED status and returns a JSON response containing:
   * - taskId: Unique identifier for tracking the created task
   * - statusUrl: URL that can be used to query the status of the data copy operation
   */
  public class LiveMigrationCreateDataCopyTaskHandler extends AbstractHandler<LiveMigrationDataCopyRequest> implements AccessProtected
  {
      private static final Logger LOGGER = LoggerFactory.getLogger(LiveMigrationCreateDataCopyTaskHandler.class);
      private final DataCopyTaskManager dataCopyTaskManager;
  
      @Inject
      public LiveMigrationCreateDataCopyTaskHandler(InstanceMetadataFetcher metadataFetcher,
                                                    ExecutorPools executorPools,
                                                    CassandraInputValidator validator,
                                                    DataCopyTaskManager dataCopyTaskManager)
      {
          super(metadataFetcher, executorPools, validator);
          this.dataCopyTaskManager = dataCopyTaskManager;
      }
  
      @Override
      protected LiveMigrationDataCopyRequest extractParamsOrThrow(RoutingContext context)
      {
          try
          {
              return Json.decodeValue(context.body().buffer(), LiveMigrationDataCopyRequest.class);
          }
          catch (DecodeException decodeException)
          {
              throw wrapHttpException(HttpResponseStatus.BAD_REQUEST,
                                      "Error while decoding values, please check your request body.",
                                      decodeException);
          }
      }
  
      @Override
      protected void handleInternal(RoutingContext context,
                                    HttpServerRequest httpRequest,
                                    @NotNull String host,
                                    SocketAddress remoteAddress,
                                    LiveMigrationDataCopyRequest liveMigrationTaskRequest)
      {
          dataCopyTaskManager
          .createTask(liveMigrationTaskRequest, host)
          .onSuccess(task -> {
              context.response().setStatusCode(HttpResponseStatus.ACCEPTED.code());
              context.json(buildResponse(task));
          })
          .onFailure(throwable -> {
              if (throwable instanceof LiveMigrationInvalidRequestException)
              {
                  LOGGER.error("Input payload is not valid.", throwable);
                  context.fail(wrapHttpException(HttpResponseStatus.BAD_REQUEST, throwable.getMessage(), throwable));
              }
              else if (throwable instanceof LiveMigrationDataCopyInProgressException)
              {
                  LOGGER.error("Cannot start a new data copy task while another one is in progress.");
                  context.fail(wrapHttpException(HttpResponseStatus.FORBIDDEN, throwable.getMessage(), throwable));
              }
              else
              {
                  LOGGER.error("Unexpected exception while creating the data copy task.", throwable);
                  context.fail(wrapHttpException(HttpResponseStatus.INTERNAL_SERVER_ERROR,
                                                 throwable.getMessage(), throwable));
              }
          });
      }
  
      private JsonObject buildResponse(LiveMigrationTask task)
      {
          return new JsonObject()
                 .put("taskId", task.id())
                 .put("statusUrl", ApiEndpointsV1.LIVE_MIGRATION_DATA_COPY_TASKS_ROUTE + "/" + task.id());
      }
  
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          return Set.of(BasicPermissions.STREAM_FILES.toAuthorization());
      }
  }
  