SwapEnvironmentCnamesMojo.java

/*
 * Copyright (c) 2016 ingenieux Labs
 *
 * 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 br.com.ingenieux.mojo.beanstalk.env;

import com.amazonaws.services.elasticbeanstalk.model.EnvironmentDescription;

import org.apache.commons.lang.Validate;
import org.apache.maven.plugin.AbstractMojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;

import java.util.Collection;

import br.com.ingenieux.mojo.beanstalk.AbstractBeanstalkMojo;
import br.com.ingenieux.mojo.beanstalk.cmd.env.swap.SwapCNamesCommand;
import br.com.ingenieux.mojo.beanstalk.cmd.env.swap.SwapCNamesContext;
import br.com.ingenieux.mojo.beanstalk.cmd.env.swap.SwapCNamesContextBuilder;
import br.com.ingenieux.mojo.beanstalk.cmd.env.waitfor.WaitForEnvironmentCommand;
import br.com.ingenieux.mojo.beanstalk.cmd.env.waitfor.WaitForEnvironmentContextBuilder;
import br.com.ingenieux.mojo.beanstalk.util.EnvironmentHostnameUtil;

import static java.lang.String.format;
import static org.apache.commons.lang.StringUtils.defaultString;
import static org.apache.commons.lang.StringUtils.isBlank;
import static org.apache.commons.lang.StringUtils.isNotBlank;

/**
 * Lists the available solution stacks
 *
 * See the docs for the <a href= "http://docs.amazonwebservices.com/elasticbeanstalk/latest/api/API_SwapEnvironmentCNAMEs.html"
 * >SwapEnvironmentCNAMEs API</a> call.
 *
 * @author Aldrin Leal
 * @since 0.2.3
 */
@Mojo(name = "swap-environment-cnames")
public class SwapEnvironmentCnamesMojo extends AbstractBeanstalkMojo {

  /**
   * Beanstalk Application Name
   */
  @Parameter(property = "beanstalk.applicationName", defaultValue = "${project.artifactId}", required = true)
  String applicationName;

  /**
   * EnvironmentRef of source environment
   */
  @Parameter(property = "beanstalk.sourceEnvironmentRef")
  String sourceEnvironmentRef;

  /**
   * EnvironmentRef of target environment
   */
  @Parameter(property = "beanstalk.targetEnvironmentRef")
  String targetEnvironmentRef;

  /**
   * cname of source environment
   */
  @Parameter(property = "beanstalk.sourceEnvironmentCNamePrefix")
  String sourceEnvironmentCNamePrefix;

  /**
   * cname of target environment
   */
  @Parameter(property = "beanstalk.targetEnvironmentCNamePrefix")
  String targetEnvironmentCNamePrefix;

  boolean nonBlank(String... args) {
    for (String a : args) if (isBlank(a)) return false;

    return true;
  }

  @Override
  protected Object executeInternal() throws AbstractMojoExecutionException {
    SwapCNamesContext context;

    if (nonBlank(sourceEnvironmentRef, targetEnvironmentRef)) {
      EnvironmentDescription e0 =
          findOnly(
              new WaitForEnvironmentCommand(this)
                  .lookupInternal(
                      new WaitForEnvironmentContextBuilder().withApplicationName(applicationName).withEnvironmentRef(sourceEnvironmentRef).build()));

      EnvironmentDescription e1 =
          findOnly(
              new WaitForEnvironmentCommand(this)
                  .lookupInternal(
                      new WaitForEnvironmentContextBuilder().withApplicationName(applicationName).withEnvironmentRef(targetEnvironmentRef).build()));

      Validate.isTrue(isNotBlank(e0.getCNAME()), format("Environment '%s' must be non-worker (thus having a cname)", e1.getEnvironmentId()));
      Validate.isTrue(isNotBlank(e1.getCNAME()), format("Environment '%s' must be non-worker (thus having a cname)", e1.getEnvironmentId()));

      context =
          SwapCNamesContextBuilder.swapCNamesContext() //
              .withSourceEnvironmentId(e0.getEnvironmentId()) //
              .withDestinationEnvironmentId(e1.getEnvironmentId()) //
              .build();
    } else if (nonBlank(sourceEnvironmentCNamePrefix, targetEnvironmentCNamePrefix)) {
      sourceEnvironmentCNamePrefix = defaultString(sourceEnvironmentCNamePrefix);
      targetEnvironmentCNamePrefix = defaultString(targetEnvironmentCNamePrefix);

      Validate.isTrue(
          sourceEnvironmentCNamePrefix.matches("[\\p{Alnum}\\-]{4,63}"), "Invalid Source Environment CName Prefix: " + sourceEnvironmentCNamePrefix);
      Validate.isTrue(
          targetEnvironmentCNamePrefix.matches("[\\p{Alnum}\\-]{4,63}"), "Invalid Target Environment CName Prefix: " + targetEnvironmentCNamePrefix);

      EnvironmentDescription sourceEnvironment =
          lookupEnvironment(applicationName, EnvironmentHostnameUtil.ensureSuffix(sourceEnvironmentCNamePrefix, getRegion()));
      EnvironmentDescription targetEnvironment =
          lookupEnvironment(applicationName, EnvironmentHostnameUtil.ensureSuffix(targetEnvironmentCNamePrefix, getRegion()));

      // TODO: Why 'destination' instead of 'target'? Make it consistent
      context =
          SwapCNamesContextBuilder.swapCNamesContext() //
              .withSourceEnvironmentId(sourceEnvironment.getEnvironmentId()) //
              .withDestinationEnvironmentId(targetEnvironment.getEnvironmentId()) //
              .build();
    } else {
      throw new IllegalArgumentException("You must supply either {source,target}EnvironmentCNamePrefix or {source,target}EnvironmentRef");
    }

    SwapCNamesCommand command = new SwapCNamesCommand(this);

    return command.execute(context);
  }

  private EnvironmentDescription findOnly(Collection<EnvironmentDescription> environmentDescriptions) {
    Validate.isTrue(1 == environmentDescriptions.size(), "More than one environment matches spec");

    return environmentDescriptions.iterator().next();
  }
}