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.datastax.driver.core.utils.UUIDs;
  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.common.data.OperationalJobStatus;
  import org.apache.cassandra.sidecar.common.response.OperationalJobResponse;
  import org.apache.cassandra.sidecar.common.server.StorageOperations;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.config.ServiceConfiguration;
  import org.apache.cassandra.sidecar.exceptions.OperationalJobConflictException;
  import org.apache.cassandra.sidecar.job.NodeDecommissionJob;
  import org.apache.cassandra.sidecar.job.OperationalJobManager;
  import org.apache.cassandra.sidecar.utils.CassandraInputValidator;
  import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;
  import org.apache.cassandra.sidecar.utils.OperationalJobUtils;
  import org.jetbrains.annotations.NotNull;
  
  import static org.apache.cassandra.sidecar.utils.RequestUtils.parseBooleanQueryParam;
  
  /**
   * Provides REST API for asynchronously decommissioning the corresponding Cassandra node
   */
  public class NodeDecommissionHandler extends AbstractHandler<Boolean> implements AccessProtected
  {
      private final OperationalJobManager jobManager;
      private final ServiceConfiguration config;
  
      /**
       * Constructs a handler with the provided {@code metadataFetcher}
       *
       * @param metadataFetcher the interface to retrieve instance metadata
       * @param executorPools   the executor pools for blocking executions
       * @param validator       a validator instance to validate Cassandra-specific input
       */
      @Inject
      protected NodeDecommissionHandler(InstanceMetadataFetcher metadataFetcher,
                                        ExecutorPools executorPools,
                                        ServiceConfiguration serviceConfiguration,
                                        CassandraInputValidator validator,
                                        OperationalJobManager jobManager)
      {
          super(metadataFetcher, executorPools, validator);
          this.jobManager = jobManager;
          this.config = serviceConfiguration;
      }
  
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          return Collections.singleton(BasicPermissions.DECOMMISSION_NODE.toAuthorization());
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void handleInternal(RoutingContext context,
                                 HttpServerRequest httpRequest,
                                 @NotNull String host,
                                 SocketAddress remoteAddress,
                                 Boolean isForce)
      {
          StorageOperations operations = metadataFetcher.delegate(host).storageOperations();
          NodeDecommissionJob job = new NodeDecommissionJob(UUIDs.timeBased(), operations, isForce);
          try
          {
              jobManager.trySubmitJob(job);
          }
          catch (OperationalJobConflictException oje)
          {
              String reason = oje.getMessage();
              logger.error("Conflicting job encountered. reason={}", reason);
              context.response().setStatusCode(HttpResponseStatus.CONFLICT.code());
              context.json(new OperationalJobResponse(job.jobId(), OperationalJobStatus.FAILED, job.name(), reason));
              return;
          }
  
          // Get the result, waiting for the specified wait time for result
          job.asyncResult(executorPools.service(), config.operationalJobExecutionMaxWaitTime())
             .onComplete(v -> OperationalJobUtils.sendStatusBasedResponse(context, job));
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected Boolean extractParamsOrThrow(RoutingContext context)
      {
          return parseBooleanQueryParam(context.request(), "force", false);
      }
  }
  