Add WebSocketClient for Java WebSocket (JSR-356)

Issue: SPR-14527

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/adapter/StandardEndpoint.java

@@ -0,0 +1,168 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * 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 org.springframework.web.reactive.socket.adapter;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import javax.websocket.CloseReason;
+import javax.websocket.Endpoint;
+import javax.websocket.EndpointConfig;
+import javax.websocket.PongMessage;
+import javax.websocket.Session;
+
+import org.reactivestreams.Subscriber;
+import org.reactivestreams.Subscription;
+
+import reactor.core.publisher.MonoProcessor;
+
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.web.reactive.socket.CloseStatus;
+import org.springframework.web.reactive.socket.HandshakeInfo;
+import org.springframework.web.reactive.socket.WebSocketHandler;
+import org.springframework.web.reactive.socket.WebSocketMessage;
+import org.springframework.web.reactive.socket.WebSocketMessage.Type;
+
+/**
+ *  {@link Endpoint} delegating events
+ * to a reactive {@link WebSocketHandler} and its session.
+ * 
+ * @author Violeta Georgieva
+ * @since 5.0
+ */
+public class StandardEndpoint extends Endpoint {
+
+	private final WebSocketHandler handler;
+
+	private final HandshakeInfo info;
+
+	private final DataBufferFactory bufferFactory;
+
+	private StandardWebSocketSession delegateSession;
+
+	private final MonoProcessor<Void> completionMono;
+
+
+	public StandardEndpoint(WebSocketHandler handler, HandshakeInfo info,
+			DataBufferFactory bufferFactory) {
+		this(handler, info, bufferFactory, null);
+	}
+
+	public StandardEndpoint(WebSocketHandler handler, HandshakeInfo info,
+			DataBufferFactory bufferFactory, MonoProcessor<Void> completionMono) {
+		this.handler = handler;
+		this.info = info;
+		this.bufferFactory = bufferFactory;
+		this.completionMono = completionMono;
+	}
+
+
+	@Override
+	public void onOpen(Session nativeSession, EndpointConfig config) {
+
+		this.delegateSession = new StandardWebSocketSession(nativeSession, this.info, this.bufferFactory);
+
+		nativeSession.addMessageHandler(String.class, message -> {
+			WebSocketMessage webSocketMessage = toMessage(message);
+			this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+		});
+		nativeSession.addMessageHandler(ByteBuffer.class, message -> {
+			WebSocketMessage webSocketMessage = toMessage(message);
+			this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+		});
+		nativeSession.addMessageHandler(PongMessage.class, message -> {
+			WebSocketMessage webSocketMessage = toMessage(message);
+			this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
+		});
+
+		HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber();
+		this.handler.handle(this.delegateSession).subscribe(resultSubscriber);
+	}
+
+	private <T> WebSocketMessage toMessage(T message) {
+		if (message instanceof String) {
+			byte[] bytes = ((String) message).getBytes(StandardCharsets.UTF_8);
+			return new WebSocketMessage(Type.TEXT, this.bufferFactory.wrap(bytes));
+		}
+		else if (message instanceof ByteBuffer) {
+			DataBuffer buffer = this.bufferFactory.wrap((ByteBuffer) message);
+			return new WebSocketMessage(Type.BINARY, buffer);
+		}
+		else if (message instanceof PongMessage) {
+			DataBuffer buffer = this.bufferFactory.wrap(((PongMessage) message).getApplicationData());
+			return new WebSocketMessage(Type.PONG, buffer);
+		}
+		else {
+			throw new IllegalArgumentException("Unexpected message type: " + message);
+		}
+	}
+
+	@Override
+	public void onClose(Session session, CloseReason reason) {
+		if (this.delegateSession != null) {
+			int code = reason.getCloseCode().getCode();
+			this.delegateSession.handleClose(new CloseStatus(code, reason.getReasonPhrase()));
+		}
+	}
+
+	@Override
+	public void onError(Session session, Throwable exception) {
+		if (this.delegateSession != null) {
+			this.delegateSession.handleError(exception);
+		}
+	}
+
+	protected HandshakeInfo getHandshakeInfo() {
+		return this.info;
+	}
+
+
+	private final class HandlerResultSubscriber implements Subscriber<Void> {
+
+		@Override
+		public void onSubscribe(Subscription subscription) {
+			subscription.request(Long.MAX_VALUE);
+		}
+
+		@Override
+		public void onNext(Void aVoid) {
+			// no op
+		}
+
+		@Override
+		public void onError(Throwable ex) {
+			if (completionMono != null) {
+				completionMono.onError(ex);
+			}
+			if (delegateSession != null) {
+				int code = CloseStatus.SERVER_ERROR.getCode();
+				delegateSession.close(new CloseStatus(code, ex.getMessage()));
+			}
+		}
+
+		@Override
+		public void onComplete() {
+			if (completionMono != null) {
+				completionMono.onComplete();
+			}
+			if (delegateSession != null) {
+				delegateSession.close();
+			}
+		}
+	}
+
+}

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/adapter/StandardWebSocketHandlerAdapter.java

@@ -16,28 +16,14 @@
 
 package org.springframework.web.reactive.socket.adapter;
 
-import java.nio.ByteBuffer;
-import java.nio.charset.StandardCharsets;
-import javax.websocket.CloseReason;
 import javax.websocket.Endpoint;
-import javax.websocket.EndpointConfig;
-import javax.websocket.PongMessage;
-import javax.websocket.Session;
 
-import org.reactivestreams.Subscriber;
-import org.reactivestreams.Subscription;
-
-import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferFactory;
-import org.springframework.web.reactive.socket.CloseStatus;
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.WebSocketHandler;
-import org.springframework.web.reactive.socket.WebSocketMessage;
-import org.springframework.web.reactive.socket.WebSocketMessage.Type;
 
 /**
- * Adapter for Java WebSocket API (JSR-356) {@link Endpoint} delegating events
- * to a reactive {@link WebSocketHandler} and its session.
+ * Adapter for Java WebSocket API (JSR-356).
  *
  * @author Violeta Georgieva
  * @author Rossen Stoyanchev
@@ -45,8 +31,6 @@ import org.springframework.web.reactive.socket.WebSocketMessage.Type;
  */
 public class StandardWebSocketHandlerAdapter extends WebSocketHandlerAdapterSupport {
 
-	private StandardWebSocketSession delegateSession;
-
 
 	public StandardWebSocketHandlerAdapter(WebSocketHandler delegate, HandshakeInfo info,
 			DataBufferFactory bufferFactory) {
@@ -56,94 +40,7 @@ public class StandardWebSocketHandlerAdapter extends WebSocketHandlerAdapterSupp
 
 
 	public Endpoint getEndpoint() {
-		return new StandardEndpoint();
-	}
-
-
-	private class StandardEndpoint extends Endpoint {
-
-		@Override
-		public void onOpen(Session nativeSession, EndpointConfig config) {
-
-			delegateSession = new StandardWebSocketSession(nativeSession, getHandshakeInfo(), bufferFactory());
-
-			nativeSession.addMessageHandler(String.class, message -> {
-				WebSocketMessage webSocketMessage = toMessage(message);
-				delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
-			});
-			nativeSession.addMessageHandler(ByteBuffer.class, message -> {
-				WebSocketMessage webSocketMessage = toMessage(message);
-				delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
-			});
-			nativeSession.addMessageHandler(PongMessage.class, message -> {
-				WebSocketMessage webSocketMessage = toMessage(message);
-				delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
-			});
-
-			HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber();
-			getDelegate().handle(delegateSession).subscribe(resultSubscriber);
-		}
-
-		private <T> WebSocketMessage toMessage(T message) {
-			if (message instanceof String) {
-				byte[] bytes = ((String) message).getBytes(StandardCharsets.UTF_8);
-				return new WebSocketMessage(Type.TEXT, bufferFactory().wrap(bytes));
-			}
-			else if (message instanceof ByteBuffer) {
-				DataBuffer buffer = bufferFactory().wrap((ByteBuffer) message);
-				return new WebSocketMessage(Type.BINARY, buffer);
-			}
-			else if (message instanceof PongMessage) {
-				DataBuffer buffer = bufferFactory().wrap(((PongMessage) message).getApplicationData());
-				return new WebSocketMessage(Type.PONG, buffer);
-			}
-			else {
-				throw new IllegalArgumentException("Unexpected message type: " + message);
-			}
-		}
-
-		@Override
-		public void onClose(Session session, CloseReason reason) {
-			if (delegateSession != null) {
-				int code = reason.getCloseCode().getCode();
-				delegateSession.handleClose(new CloseStatus(code, reason.getReasonPhrase()));
-			}
-		}
-
-		@Override
-		public void onError(Session session, Throwable exception) {
-			if (delegateSession != null) {
-				delegateSession.handleError(exception);
-			}
-		}
-	}
-
-	private final class HandlerResultSubscriber implements Subscriber<Void> {
-
-		@Override
-		public void onSubscribe(Subscription subscription) {
-			subscription.request(Long.MAX_VALUE);
-		}
-
-		@Override
-		public void onNext(Void aVoid) {
-			// no op
-		}
-
-		@Override
-		public void onError(Throwable ex) {
-			if (delegateSession != null) {
-				int code = CloseStatus.SERVER_ERROR.getCode();
-				delegateSession.close(new CloseStatus(code, ex.getMessage()));
-			}
-		}
-
-		@Override
-		public void onComplete() {
-			if (delegateSession != null) {
-				delegateSession.close();
-			}
-		}
+		return new StandardEndpoint(getDelegate(), getHandshakeInfo(), bufferFactory());
 	}
 
 }

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/client/StandardWebSocketClient.java

@@ -0,0 +1,160 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * 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 org.springframework.web.reactive.socket.client;
+
+import java.net.URI;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.websocket.ClientEndpointConfig;
+import javax.websocket.ContainerProvider;
+import javax.websocket.Endpoint;
+import javax.websocket.EndpointConfig;
+import javax.websocket.HandshakeResponse;
+import javax.websocket.Session;
+import javax.websocket.WebSocketContainer;
+import javax.websocket.ClientEndpointConfig.Configurator;
+
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.MonoProcessor;
+
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.http.HttpHeaders;
+import org.springframework.web.reactive.socket.HandshakeInfo;
+import org.springframework.web.reactive.socket.WebSocketHandler;
+import org.springframework.web.reactive.socket.adapter.StandardEndpoint;
+
+/**
+ * A Java WebSocket API (JSR-356) based implementation of
+ * {@link WebSocketClient}.
+ * 
+ * @author Violeta Georgieva
+ * @since 5.0
+ */
+public class StandardWebSocketClient extends WebSocketClientSupport implements WebSocketClient {
+
+	private final DataBufferFactory bufferFactory = new DefaultDataBufferFactory();
+
+	private final WebSocketContainer wsContainer;
+
+
+	/**
+	 * Default constructor that calls {@code ContainerProvider.getWebSocketContainer()}
+	 * to obtain a (new) {@link WebSocketContainer} instance.
+	 */
+	public StandardWebSocketClient() {
+		this(ContainerProvider.getWebSocketContainer());
+	}
+
+	/**
+	 * Constructor accepting an existing {@link WebSocketContainer} instance.
+	 * @param wsContainer a web socket container
+	 */
+	public StandardWebSocketClient(WebSocketContainer wsContainer) {
+		this.wsContainer = wsContainer;
+	}
+
+
+	@Override
+	public Mono<Void> execute(URI url, WebSocketHandler handler) {
+		return execute(url, new HttpHeaders(), handler);
+	}
+
+	@Override
+	public Mono<Void> execute(URI url, HttpHeaders headers, WebSocketHandler handler) {
+		return connectInternal(url, headers, handler);
+	}
+
+	private Mono<Void> connectInternal(URI url, HttpHeaders headers, WebSocketHandler handler) {
+		MonoProcessor<Void> processor = MonoProcessor.create();
+		return Mono.fromCallable(() -> {
+					StandardWebSocketClientConfigurator configurator =
+							new StandardWebSocketClientConfigurator(headers);
+
+					ClientEndpointConfig endpointConfig = createClientEndpointConfig(
+							configurator, beforeHandshake(url, headers, handler));
+
+					HandshakeInfo info = new HandshakeInfo(url, Mono.empty());
+
+					Endpoint endpoint = new StandardClientEndpoint(handler, info,
+							this.bufferFactory, configurator, processor);
+
+					Session session = this.wsContainer.connectToServer(endpoint, endpointConfig, url);
+					return session;
+				}).then(processor);
+	}
+
+	private ClientEndpointConfig createClientEndpointConfig(
+			StandardWebSocketClientConfigurator configurator, String[] subProtocols) {
+
+		return ClientEndpointConfig.Builder.create()
+				.configurator(configurator)
+				.preferredSubprotocols(Arrays.asList(subProtocols))
+				.build();
+	}
+
+
+	private static final class StandardClientEndpoint extends StandardEndpoint {
+
+		private final StandardWebSocketClientConfigurator configurator;
+
+		public StandardClientEndpoint(WebSocketHandler handler, HandshakeInfo info,
+				DataBufferFactory bufferFactory, StandardWebSocketClientConfigurator configurator,
+				MonoProcessor<Void> processor) {
+			super(handler, info, bufferFactory, processor);
+			this.configurator = configurator;
+		}
+
+		@Override
+		public void onOpen(Session nativeSession, EndpointConfig config) {
+			getHandshakeInfo().setHeaders(this.configurator.getResponseHeaders());
+			getHandshakeInfo().setSubProtocol(
+					Optional.ofNullable(nativeSession.getNegotiatedSubprotocol()));
+
+			super.onOpen(nativeSession, config);
+		}
+	}
+
+
+	private static final class StandardWebSocketClientConfigurator extends Configurator {
+
+		private final HttpHeaders requestHeaders;
+
+		private HttpHeaders responseHeaders = new HttpHeaders();
+
+		public StandardWebSocketClientConfigurator(HttpHeaders requestHeaders) {
+			this.requestHeaders = requestHeaders;
+		}
+
+		@Override
+		public void beforeRequest(Map<String, List<String>> requestHeaders) {
+			requestHeaders.putAll(this.requestHeaders);
+		}
+
+		@Override
+		public void afterResponse(HandshakeResponse response) {
+			response.getHeaders().forEach((k, v) -> responseHeaders.put(k, v));
+		}
+
+		public HttpHeaders getResponseHeaders() {
+			return this.responseHeaders;
+		}
+	}
+
+}

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/server/upgrade/TomcatRequestUpgradeStrategy.java

@@ -25,7 +25,6 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.websocket.Endpoint;
-import javax.websocket.server.ServerEndpointConfig;
 
 import org.apache.tomcat.websocket.server.WsServerContainer;
 import reactor.core.publisher.Mono;

spring-web-reactive/src/test/java/org/springframework/web/reactive/socket/server/WebSocketIntegrationTests.java

@@ -41,6 +41,7 @@ import org.springframework.web.reactive.socket.WebSocketSession;
 import org.springframework.web.reactive.socket.client.JettyWebSocketClient;
 import org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient;
 import org.springframework.web.reactive.socket.client.RxNettyWebSocketClient;
+import org.springframework.web.reactive.socket.client.StandardWebSocketClient;
 import org.springframework.web.reactive.socket.client.WebSocketClient;
 
 import static org.junit.Assert.assertEquals;
@@ -78,6 +79,11 @@ public class WebSocketIntegrationTests extends AbstractWebSocketIntegrationTests
 		client.stop();
 	}
 
+	@Test
+	public void echoStandardClient() throws Exception {
+		testEcho(new StandardWebSocketClient());
+	}
+
 	private void testEcho(WebSocketClient client) throws URISyntaxException {
 		int count = 100;
 		Flux<String> input = Flux.range(1, count).map(index -> "msg-" + index);
@@ -113,6 +119,11 @@ public class WebSocketIntegrationTests extends AbstractWebSocketIntegrationTests
 		client.stop();
 	}
 
+	@Test
+	public void subProtocolStandardClient() throws Exception {
+		testSubProtocol(new StandardWebSocketClient());
+	}
+
 	private void testSubProtocol(WebSocketClient client) throws URISyntaxException {
 		String protocol = "echo-v1";
 		AtomicReference<HandshakeInfo> infoRef = new AtomicReference<>();