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druid-services
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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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 io.druid.cli;

import com.google.inject.Injector;
import io.airlift.command.Cli;
import io.airlift.command.Help;
import io.airlift.command.ParseException;
import io.druid.cli.convert.ConvertProperties;
import io.druid.cli.validate.DruidJsonValidator;
import io.druid.guice.ExtensionsConfig;
import io.druid.guice.GuiceInjectors;
import io.druid.initialization.Initialization;

import java.util.Collection;

/**
 */
public class Main
{
  @SuppressWarnings("unchecked")
  public static void main(String[] args)
  {
    final Cli.CliBuilder builder = Cli.builder("druid");

    builder.withDescription("Druid command-line runner.")
           .withDefaultCommand(Help.class)
           .withCommands(Help.class, Version.class);

    builder.withGroup("server")
           .withDescription("Run one of the Druid server types.")
           .withDefaultCommand(Help.class)
           .withCommands(
               CliCoordinator.class, CliHistorical.class, CliBroker.class,
               CliRealtime.class, CliOverlord.class, CliMiddleManager.class,
               CliBridge.class, CliRouter.class
           );

    builder.withGroup("example")
           .withDescription("Run an example")
           .withDefaultCommand(Help.class)
           .withCommands(CliRealtimeExample.class);

    builder.withGroup("tools")
           .withDescription("Various tools for working with Druid")
           .withDefaultCommand(Help.class)
           .withCommands(ConvertProperties.class, DruidJsonValidator.class, PullDependencies.class, CreateTables.class);

    builder.withGroup("index")
               .withDescription("Run indexing for druid")
               .withDefaultCommand(Help.class)
               .withCommands(CliHadoopIndexer.class);

    builder.withGroup("internal")
           .withDescription("Processes that Druid runs \"internally\", you should rarely use these directly")
           .withDefaultCommand(Help.class)
           .withCommands(CliPeon.class, CliInternalHadoopIndexer.class);

    final Injector injector = GuiceInjectors.makeStartupInjector();
    final ExtensionsConfig config = injector.getInstance(ExtensionsConfig.class);
    final Collection extensionCommands = Initialization.getFromExtensions(config, CliCommandCreator.class);

    for (CliCommandCreator creator : extensionCommands) {
      creator.addCommands(builder);
    }

    final Cli cli = builder.build();
    try {
      final Runnable command = cli.parse(args);
      if (! (command instanceof Help)) { // Hack to work around Help not liking being injected
        injector.injectMembers(command);
      }
      command.run();
    }
    catch (ParseException e) {
      System.out.println("ERROR!!!!");
      System.out.println(e.getMessage());
      System.out.println("===");
      cli.parse(new String[]{"help"}).run();
    }
  }
}