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.ambari.server.controller.internal;
  
  import java.net.URI;
  import java.util.Map;
  import java.util.Optional;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.controller.metrics.MetricHostProvider;
  import org.apache.ambari.server.controller.metrics.MetricsServiceProvider;
  import org.apache.ambari.server.controller.spi.SystemException;
  import org.apache.ambari.server.state.ConfigHelper;
  import org.apache.ambari.server.state.kerberos.VariableReplacementHelper;
  
  /**
   * I'm a special {@link MetricHostProvider} that can override default component host names.
   */
  public class OverriddenMetricsHostProvider implements MetricHostProvider {
    private final Map<String, String> overriddenHosts;
    private final MetricHostProvider metricHostProvider;
    private final ConfigHelper configHelper;
    private final VariableReplacementHelper variableReplacer = new VariableReplacementHelper();
  
    public OverriddenMetricsHostProvider(Map<String, String> overriddenHosts, MetricHostProvider metricHostProvider, ConfigHelper configHelper) {
      this.overriddenHosts = overriddenHosts;
      this.metricHostProvider = metricHostProvider;
      this.configHelper = configHelper;
    }
  
    @Override
    public Optional<String> getExternalHostName(String clusterName, String componentName) {
      return getOverriddenHost(componentName).map(host -> replaceVariables(clusterName, host));
    }
  
    @Override
    public boolean isCollectorHostExternal(String clusterName) {
      return metricHostProvider.isCollectorHostExternal(clusterName);
    }
  
    private Optional<String> getOverriddenHost(String componentName) {
      return Optional.ofNullable(overriddenHosts.get(componentName));
    }
  
    private String replaceVariables(String clusterName, String hostName) {
      try {
        return hostName(variableReplacer.replaceVariables(hostName, config(clusterName)));
      } catch (AmbariException e) {
        throw new RuntimeException(e);
      }
    }
  
    private Map<String, Map<String, String>> config(String clusterName) throws AmbariException {
      return configHelper.getEffectiveConfigProperties(clusterName, null);
    }
  
    private String hostName(String resolvedHost) throws AmbariException {
      return hasScheme(resolvedHost)
        ? URI.create(resolvedHost).getHost()
        : URI.create("any://" + resolvedHost).getHost();
    }
  
    private boolean hasScheme(String host) {
      return host.contains("://");
    }
  
    @Override
    public String getHostName(String clusterName, String componentName) throws SystemException {
      return metricHostProvider.getHostName(clusterName, componentName);
    }
  
    @Override
    public String getCollectorHostName(String clusterName, MetricsServiceProvider.MetricsService service) throws SystemException {
      return metricHostProvider.getCollectorHostName(clusterName, service);
    }
  
    @Override
    public String getCollectorPort(String clusterName, MetricsServiceProvider.MetricsService service) throws SystemException {
      return metricHostProvider.getCollectorPort(clusterName, service);
    }
  
    @Override
    public boolean isCollectorHostLive(String clusterName, MetricsServiceProvider.MetricsService service) throws SystemException {
      return metricHostProvider.isCollectorHostLive(clusterName, service);
    }
  
    @Override
    public boolean isCollectorComponentLive(String clusterName, MetricsServiceProvider.MetricsService service) throws SystemException {
      return metricHostProvider.isCollectorComponentLive(clusterName, service);
    }
  }
  