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.coordination;
  
  import java.util.concurrent.CompletableFuture;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  import io.vertx.core.Future;
  import org.apache.cassandra.sidecar.client.SidecarClient;
  import org.apache.cassandra.sidecar.client.SidecarInstance;
  import org.apache.cassandra.sidecar.common.response.HealthResponse;
  import org.apache.cassandra.sidecar.utils.SidecarClientProvider;
  
  
  /**
   * Provides the health of a Sidecar instance over HTTP API, retrying to
   * confirm Sidecar is DOWN for extended period of time.
   */
  @Singleton
  public class SidecarHttpHealthProvider implements SidecarPeerHealthProvider
  {
      private final SidecarClientProvider clientProvider;
  
      @Inject
      public SidecarHttpHealthProvider(SidecarClientProvider clientProvider)
      {
          this.clientProvider = clientProvider;
      }
  
      @Override
      public Future<Health> health(SidecarInstance instance)
      {
          try
          {
              SidecarClient client = clientProvider.get();
              CompletableFuture<HealthResponse> healthRequest = client.sidecarHealth(instance);
              return Future.fromCompletionStage(healthRequest)
                           .map(healthResponse -> healthResponse.isOk()
                                                  ? Health.UP
                                                  : Health.DOWN);
          }
          catch (Exception e)
          {
              return Future.succeededFuture(Health.DOWN);
          }
      }
  }
  