content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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.activej.launchers.http;
  
  import io.activej.config.Config;
  import io.activej.config.ConfigModule;
  import io.activej.eventloop.Eventloop;
  import io.activej.eventloop.inspector.ThrottlingController;
  import io.activej.http.AsyncServlet;
  import io.activej.http.HttpResponse;
  import io.activej.http.HttpServer;
  import io.activej.inject.annotation.Inject;
  import io.activej.inject.annotation.Provides;
  import io.activej.inject.binding.OptionalDependency;
  import io.activej.inject.module.AbstractModule;
  import io.activej.inject.module.Module;
  import io.activej.launcher.Launcher;
  import io.activej.reactor.nio.NioReactor;
  import io.activej.service.ServiceGraphModule;
  
  import java.net.InetSocketAddress;
  
  import static io.activej.config.Config.ofClassPathProperties;
  import static io.activej.config.Config.ofSystemProperties;
  import static io.activej.config.converter.ConfigConverters.ofInetSocketAddress;
  import static io.activej.inject.module.Modules.combine;
  import static io.activej.launchers.initializers.Initializers.ofEventloop;
  import static io.activej.launchers.initializers.Initializers.ofHttpServer;
  
  /**
   * Preconfigured Http server launcher.
   *
   * @see Launcher
   */
  public abstract class HttpServerLauncher extends Launcher {
  	public static final String HOSTNAME = "localhost";
  	public static final int PORT = 8080;
  	public static final String PROPERTIES_FILE = "http-server.properties";
  
  	@Inject
  	HttpServer httpServer;
  
  	@Provides
  	NioReactor reactor(Config config, OptionalDependency<ThrottlingController> throttlingController) {
  		return Eventloop.builder()
  			.initialize(ofEventloop(config.getChild("eventloop")))
  			.withInspector(throttlingController.orElse(null))
  			.build();
  	}
  
  	@Provides
  	HttpServer server(NioReactor reactor, AsyncServlet rootServlet, Config config) {
  		return HttpServer.builder(reactor, rootServlet)
  			.initialize(ofHttpServer(config.getChild("http")))
  			.build();
  	}
  
  	@Provides
  	Config config() {
  		return Config.create()
  			.with("http.listenAddresses", Config.ofValue(ofInetSocketAddress(), new InetSocketAddress(HOSTNAME, PORT)))
  			.overrideWith(ofClassPathProperties(PROPERTIES_FILE, true))
  			.overrideWith(ofSystemProperties("config"));
  	}
  
  	@Override
  	protected final Module getModule() {
  		return combine(
  			ServiceGraphModule.create(),
  			ConfigModule.builder()
  				.withEffectiveConfigLogger()
  				.build(),
  			getBusinessLogicModule()
  		);
  	}
  
  	/**
  	 * Override this method to supply your launcher business logic.
  	 */
  	protected Module getBusinessLogicModule() {
  		return Module.empty();
  	}
  
  	@Override
  	protected void run() throws Exception {
  		if (logger.isInfoEnabled()) {
  			logger.info("HTTP Server is now available at {}", String.join(", ", httpServer.getHttpAddresses()));
  		}
  		awaitShutdown();
  	}
  
  	public static void main(String[] args) throws Exception {
  
  		Launcher launcher = new HttpServerLauncher() {
  			@Override
  			protected Module getBusinessLogicModule() {
  				return new AbstractModule() {
  					@Provides
  					public AsyncServlet servlet(Config config) {
  						String message = config.get("message", "Hello, world!");
  						return request -> HttpResponse.ok200()
  							.withPlainText(message)
  							.toPromise();
  					}
  				};
  			}
  		};
  
  		launcher.launch(args);
  	}
  }
  