Java tutorial
/** * Copyright (c) 2017 Bosch Software Innovations GmbH. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Bosch Software Innovations GmbH - initial creation */ package org.eclipse.hono.service.http; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Objects; import java.util.Set; import org.eclipse.hono.config.ServiceConfigProperties; import org.eclipse.hono.service.AbstractServiceBase; import org.eclipse.hono.util.Constants; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import io.vertx.core.CompositeFuture; import io.vertx.core.Future; import io.vertx.core.http.HttpServer; import io.vertx.core.http.HttpServerOptions; import io.vertx.ext.healthchecks.HealthCheckHandler; import io.vertx.ext.web.Router; import io.vertx.ext.web.handler.BodyHandler; /** * A base class for implementing services using HTTP. * * @param <T> The type of configuration properties used by this service. */ public abstract class HttpServiceBase<T extends ServiceConfigProperties> extends AbstractServiceBase<T> { /** * Default file uploads directory used by Vert.x Web */ protected static final String DEFAULT_UPLOADS_DIRECTORY = "/tmp"; private final Set<HttpEndpoint> endpoints = new HashSet<>(); @Value("${spring.profiles.active:}") private String activeProfiles; private HttpServer server; private HttpServer insecureServer; /** * Adds multiple endpoints to this server. * * @param definedEndpoints The endpoints. */ @Autowired(required = false) public final void addEndpoints(final Set<HttpEndpoint> definedEndpoints) { endpoints.addAll(Objects.requireNonNull(definedEndpoints)); } /** * Adds an endpoint to this server. * * @param ep The endpoint. */ public final void addEndpoint(final HttpEndpoint ep) { LOG.debug("registering endpoint [{}]", ep.getName()); endpoints.add(Objects.requireNonNull(ep)); } @Autowired @Qualifier(Constants.QUALIFIER_REST) @Override public final void setConfig(final T configuration) { setSpecificConfig(configuration); } /** * The default port. * * Subclasses should override this method to provide a service specific default value. * <p> * * @return 8443 */ @Override public int getPortDefaultValue() { return 8443; } /** * The default insecure port. * * Subclasses should override this method to provide a service specific default value. * <p> * * @return 8080 */ @Override public int getInsecurePortDefaultValue() { return 8080; } @Override protected final int getActualPort() { return (server != null ? server.actualPort() : Constants.PORT_UNCONFIGURED); } @Override protected final int getActualInsecurePort() { return (insecureServer != null ? insecureServer.actualPort() : Constants.PORT_UNCONFIGURED); } /** * Invoked before the http server is started. * <p> * Subclasses may override this method to do any kind of initialization work. * * @return A future indicating the outcome of the operation. The start up process fails if the returned future * fails. */ protected Future<Void> preStartServers() { return Future.succeededFuture(); } @Override protected final Future<Void> startInternal() { return preStartServers().compose(s -> checkPortConfiguration()).compose(s -> startEndpoints()) .compose(router -> { return CompositeFuture.all(bindSecureHttpServer(router), bindInsecureHttpServer(router)); }).compose(s -> onStartupSuccess()); } /** * Invoked after the http server has been started successfully. * <p> * May be overridden by sub-classes. * * @return A future indicating the outcome of the operation. The start up process fails if the returned future * fails. */ protected Future<Void> onStartupSuccess() { return Future.succeededFuture(); } /** * Creates the router for handling requests. * <p> * This method creates a router instance with a default route limiting the body size of requests to the maximum * payload size set in the <em>config</em> properties. * * @return The newly created router (never {@code null}). */ protected Router createRouter() { final Router router = Router.router(vertx); LOG.info("limiting size of inbound request body to {} bytes", getConfig().getMaxPayloadSize()); router.route().handler(BodyHandler.create().setBodyLimit(getConfig().getMaxPayloadSize()) .setUploadsDirectory(DEFAULT_UPLOADS_DIRECTORY)); return router; } private void addEndpointRoutes(final Router router) { for (HttpEndpoint ep : endpoints) { ep.addRoutes(router); } } /** * Adds custom routes for handling requests that are not handled by the registered endpoints. * <p> * This method is invoked right before the http server is started with the value returned by * {@link #createRouter()}. * <p> * This default implementation does not register any routes. Subclasses should override this * method in order to register any routes in addition to the ones added by the endpoints. * * @param router The router to add the custom routes to. */ protected void addCustomRoutes(final Router router) { // empty default implementation } /** * Gets the options to use for creating the TLS secured http server. * <p> * Subclasses may override this method in order to customize the server. * <p> * This method returns default options with the host and port being set to the corresponding values from the * <em>config</em> properties and using a maximum chunk size of 4096 bytes. * * @return The http server options. */ protected HttpServerOptions getHttpServerOptions() { HttpServerOptions options = new HttpServerOptions(); options.setHost(getConfig().getBindAddress()).setPort(getConfig().getPort(getPortDefaultValue())) .setMaxChunkSize(4096); addTlsKeyCertOptions(options); addTlsTrustOptions(options); return options; } /** * Gets the options to use for creating the insecure http server. * <p> * Subclasses may override this method in order to customize the server. * <p> * This method returns default options with the host and port being set to the corresponding values from the * <em>config</em> properties and using a maximum chunk size of 4096 bytes. * * @return The http server options. */ protected HttpServerOptions getInsecureHttpServerOptions() { HttpServerOptions options = new HttpServerOptions(); options.setHost(getConfig().getInsecurePortBindAddress()) .setPort(getConfig().getInsecurePort(getInsecurePortDefaultValue())).setMaxChunkSize(4096); return options; } private Future<HttpServer> bindSecureHttpServer(final Router router) { if (isSecurePortEnabled()) { Future<HttpServer> result = Future.future(); final String bindAddress = server == null ? getConfig().getBindAddress() : "?"; if (server == null) { server = vertx.createHttpServer(getHttpServerOptions()); } server.requestHandler(router::accept).listen(bindAttempt -> { if (bindAttempt.succeeded()) { if (getPort() == getPortDefaultValue()) { LOG.info("server listens on standard secure port [{}:{}]", bindAddress, server.actualPort()); } else { LOG.warn("server listens on non-standard secure port [{}:{}], default is {}", bindAddress, server.actualPort(), getPortDefaultValue()); } result.complete(bindAttempt.result()); } else { LOG.error("cannot bind to secure port", bindAttempt.cause()); result.fail(bindAttempt.cause()); } }); return result; } else { return Future.succeededFuture(); } } private Future<HttpServer> bindInsecureHttpServer(final Router router) { if (isInsecurePortEnabled()) { Future<HttpServer> result = Future.future(); final String bindAddress = insecureServer == null ? getConfig().getInsecurePortBindAddress() : "?"; if (insecureServer == null) { insecureServer = vertx.createHttpServer(getInsecureHttpServerOptions()); } insecureServer.requestHandler(router::accept).listen(bindAttempt -> { if (bindAttempt.succeeded()) { if (getInsecurePort() == getInsecurePortDefaultValue()) { LOG.info("server listens on standard insecure port [{}:{}]", bindAddress, insecureServer.actualPort()); } else { LOG.warn("server listens on non-standard insecure port [{}:{}], default is {}", bindAddress, insecureServer.actualPort(), getInsecurePortDefaultValue()); } result.complete(bindAttempt.result()); } else { LOG.error("cannot bind to insecure port", bindAttempt.cause()); result.fail(bindAttempt.cause()); } }); return result; } else { return Future.succeededFuture(); } } private Future<Router> startEndpoints() { final Future<Router> startFuture = Future.future(); final Router router = createRouter(); if (router == null) { startFuture.fail("no router configured"); } else { addEndpointRoutes(router); addCustomRoutes(router); @SuppressWarnings("rawtypes") List<Future> endpointFutures = new ArrayList<>(endpoints.size()); for (HttpEndpoint ep : endpoints) { LOG.info("starting endpoint [name: {}, class: {}]", ep.getName(), ep.getClass().getName()); Future<Void> endpointFuture = Future.future(); endpointFutures.add(endpointFuture); ep.start(endpointFuture); } CompositeFuture.all(endpointFutures).setHandler(startup -> { if (startup.succeeded()) { startFuture.complete(router); } else { startFuture.fail(startup.cause()); } }); } return startFuture; } @Override protected final Future<Void> stopInternal() { return preShutdown().compose(s -> stopServer()).compose(s -> stopInsecureServer()) .compose(v -> postShutdown()); } private Future<Void> stopServer() { Future<Void> serverStopTracker = Future.future(); if (server != null) { server.close(serverStopTracker.completer()); } else { serverStopTracker.complete(); } return serverStopTracker; } private Future<Void> stopInsecureServer() { Future<Void> insecureServerStopTracker = Future.future(); if (insecureServer != null) { insecureServer.close(insecureServerStopTracker.completer()); } else { insecureServerStopTracker.complete(); } return insecureServerStopTracker; } /** * Invoked before the http server is shut down. * <p> * Subclasses may override this method. * * @return A future indicating the outcome of the operation. */ protected Future<Void> preShutdown() { return Future.succeededFuture(); } /** * Invoked after the http server has been shutdown successfully. * <p> * May be overridden by sub-classes. * * @return A future that has to be completed when this operation is finished. */ protected Future<Void> postShutdown() { return Future.succeededFuture(); } /** * Iterates over all endpoints and registers their readiness checks with the handler. * <p> * Subclasses may override this method in order to register other/additional checks. * * @param handler The handler to register the checks with. */ @Override public void registerReadinessChecks(final HealthCheckHandler handler) { for (HttpEndpoint ep : endpoints) { ep.registerReadinessChecks(handler); } } /** * Iterates over all endpoints and registers their liveness checks with the handler. * <p> * Subclasses may override this method in order to register other/additional checks. * * @param handler The handler to register the checks with. */ @Override public void registerLivenessChecks(final HealthCheckHandler handler) { for (HttpEndpoint ep : endpoints) { ep.registerLivenessChecks(handler); } } }