com.spotify.helios.agent.AddExtraHostContainerDecorator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * Licensed 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 com.spotify.helios.agent;

import com.google.common.collect.ImmutableList;
import com.google.common.net.InetAddresses;

import com.spotify.docker.client.messages.ContainerConfig;
import com.spotify.docker.client.messages.HostConfig;
import com.spotify.docker.client.messages.ImageInfo;
import com.spotify.helios.common.descriptors.Job;

import java.util.List;

/** ContainerDecorator that adds to {@link HostConfig#extraHosts}. */
public class AddExtraHostContainerDecorator implements ContainerDecorator {

  private final List extraHosts;

  public AddExtraHostContainerDecorator(final List extraHosts) {
    this.extraHosts = ImmutableList.copyOf(extraHosts);
  }

  @Override
  public void decorateHostConfig(final HostConfig.Builder hostConfig) {
    hostConfig.extraHosts(this.extraHosts);
  }

  @Override
  public void decorateContainerConfig(final Job job, final ImageInfo imageInfo,
                                      final ContainerConfig.Builder containerConfig) {
    //do nothing
  }

  /**
   * Validates that the argument has form "host:ip-address". Does not validate the form of the
   * hostname argument, but checks that the second half is valid via {@link
   * InetAddresses#isInetAddress}.
   */
  public static boolean isValidArg(String arg) {
    final String[] args = arg.split(":");
    if (args.length != 2) {
      return false;
    }

    final String ip = args[1];
    return InetAddresses.isInetAddress(ip);
  }
}