spring UndertowXhrTransport 源码
spring UndertowXhrTransport 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/UndertowXhrTransport.java
/*
* Copyright 2002-2022 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
*
* https://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.socket.sockjs.client;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import io.undertow.client.ClientCallback;
import io.undertow.client.ClientConnection;
import io.undertow.client.ClientExchange;
import io.undertow.client.ClientRequest;
import io.undertow.client.ClientResponse;
import io.undertow.client.UndertowClient;
import io.undertow.connector.ByteBufferPool;
import io.undertow.connector.PooledByteBuffer;
import io.undertow.server.DefaultByteBufferPool;
import io.undertow.util.AttachmentKey;
import io.undertow.util.HeaderMap;
import io.undertow.util.HttpString;
import io.undertow.util.Methods;
import io.undertow.util.StringReadChannelListener;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.IoUtils;
import org.xnio.OptionMap;
import org.xnio.Options;
import org.xnio.Xnio;
import org.xnio.XnioWorker;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.channels.StreamSourceChannel;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.ResponseEntity;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.client.HttpServerErrorException;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.sockjs.SockJsException;
import org.springframework.web.socket.sockjs.SockJsTransportFailureException;
import org.springframework.web.socket.sockjs.frame.SockJsFrame;
/**
* An XHR transport based on Undertow's {@link io.undertow.client.UndertowClient}.
* Requires Undertow 1.3 or 1.4, including XNIO, as of Spring Framework 5.0.
*
* <p>When used for testing purposes (e.g. load testing) or for specific use cases
* (like HTTPS configuration), a custom OptionMap should be provided:
*
* <pre class="code">
* OptionMap optionMap = OptionMap.builder()
* .set(Options.WORKER_IO_THREADS, 8)
* .set(Options.TCP_NODELAY, true)
* .set(Options.KEEP_ALIVE, true)
* .set(Options.WORKER_NAME, "SockJSClient")
* .getMap();
*
* UndertowXhrTransport transport = new UndertowXhrTransport(optionMap);
* </pre>
*
* @author Brian Clozel
* @author Rossen Stoyanchev
* @since 4.1.2
* @see org.xnio.Options
*/
public class UndertowXhrTransport extends AbstractXhrTransport {
private static final AttachmentKey<String> RESPONSE_BODY = AttachmentKey.create(String.class);
private final OptionMap optionMap;
private final UndertowClient httpClient;
private final XnioWorker worker;
private final ByteBufferPool bufferPool;
public UndertowXhrTransport() throws IOException {
this(OptionMap.builder().parse(Options.WORKER_NAME, "SockJSClient").getMap());
}
public UndertowXhrTransport(OptionMap optionMap) throws IOException {
Assert.notNull(optionMap, "OptionMap is required");
this.optionMap = optionMap;
this.httpClient = UndertowClient.getInstance();
this.worker = Xnio.getInstance().createWorker(optionMap);
this.bufferPool = new DefaultByteBufferPool(false, 1024, -1, 2);
}
/**
* Return Undertow's native HTTP client.
*/
public UndertowClient getHttpClient() {
return this.httpClient;
}
/**
* Return the {@link org.xnio.XnioWorker} backing the I/O operations
* for Undertow's HTTP client.
* @see org.xnio.Xnio
*/
public XnioWorker getWorker() {
return this.worker;
}
@Override
protected void connectInternal(TransportRequest request, WebSocketHandler handler, URI receiveUrl,
HttpHeaders handshakeHeaders, XhrClientSockJsSession session,
CompletableFuture<WebSocketSession> connectFuture) {
executeReceiveRequest(request, receiveUrl, handshakeHeaders, session, connectFuture);
}
private void executeReceiveRequest(final TransportRequest transportRequest,
final URI url, final HttpHeaders headers, final XhrClientSockJsSession session,
final CompletableFuture<WebSocketSession> connectFuture) {
if (logger.isTraceEnabled()) {
logger.trace("Starting XHR receive request for " + url);
}
ClientCallback<ClientConnection> clientCallback = new ClientCallback<>() {
@Override
public void completed(ClientConnection connection) {
ClientRequest request = new ClientRequest().setMethod(Methods.POST).setPath(url.getPath());
HttpString headerName = HttpString.tryFromString(HttpHeaders.HOST);
request.getRequestHeaders().add(headerName, url.getHost());
addHttpHeaders(request, headers);
HttpHeaders httpHeaders = transportRequest.getHttpRequestHeaders();
connection.sendRequest(request, createReceiveCallback(transportRequest,
url, httpHeaders, session, connectFuture));
}
@Override
public void failed(IOException ex) {
throw new SockJsTransportFailureException("Failed to execute request to " + url, ex);
}
};
this.httpClient.connect(clientCallback, url, this.worker, this.bufferPool, this.optionMap);
}
private static void addHttpHeaders(ClientRequest request, HttpHeaders headers) {
HeaderMap headerMap = request.getRequestHeaders();
headers.forEach((key, values) -> {
for (String value : values) {
headerMap.add(HttpString.tryFromString(key), value);
}
});
}
private ClientCallback<ClientExchange> createReceiveCallback(final TransportRequest transportRequest,
final URI url, final HttpHeaders headers, final XhrClientSockJsSession sockJsSession,
final CompletableFuture<WebSocketSession> connectFuture) {
return new ClientCallback<>() {
@Override
public void completed(final ClientExchange exchange) {
exchange.setResponseListener(new ClientCallback<ClientExchange>() {
@Override
public void completed(ClientExchange result) {
ClientResponse response = result.getResponse();
if (response.getResponseCode() != 200) {
HttpStatusCode status = HttpStatusCode.valueOf(response.getResponseCode());
IoUtils.safeClose(result.getConnection());
onFailure(new HttpServerErrorException(status, "Unexpected XHR receive status"));
}
else {
SockJsResponseListener listener = new SockJsResponseListener(
transportRequest, result.getConnection(), url, headers,
sockJsSession, connectFuture);
listener.setup(result.getResponseChannel());
}
if (logger.isTraceEnabled()) {
logger.trace("XHR receive headers: " + toHttpHeaders(response.getResponseHeaders()));
}
try {
StreamSinkChannel channel = result.getRequestChannel();
channel.shutdownWrites();
if (!channel.flush()) {
channel.getWriteSetter().set(ChannelListeners.<StreamSinkChannel>flushingChannelListener(null, null));
channel.resumeWrites();
}
}
catch (IOException exc) {
IoUtils.safeClose(result.getConnection());
onFailure(exc);
}
}
@Override
public void failed(IOException exc) {
IoUtils.safeClose(exchange.getConnection());
onFailure(exc);
}
});
}
@Override
public void failed(IOException exc) {
onFailure(exc);
}
private void onFailure(Throwable failure) {
if (connectFuture.completeExceptionally(failure)) {
return;
}
if (sockJsSession.isDisconnected()) {
sockJsSession.afterTransportClosed(null);
}
else {
sockJsSession.handleTransportError(failure);
sockJsSession.afterTransportClosed(new CloseStatus(1006, failure.getMessage()));
}
}
};
}
private static HttpHeaders toHttpHeaders(HeaderMap headerMap) {
HttpHeaders httpHeaders = new HttpHeaders();
for (HttpString name : headerMap.getHeaderNames()) {
for (String value : headerMap.get(name)) {
httpHeaders.add(name.toString(), value);
}
}
return httpHeaders;
}
@Override
protected ResponseEntity<String> executeInfoRequestInternal(URI infoUrl, HttpHeaders headers) {
return executeRequest(infoUrl, Methods.GET, headers, null);
}
@Override
protected ResponseEntity<String> executeSendRequestInternal(URI url, HttpHeaders headers, TextMessage message) {
return executeRequest(url, Methods.POST, headers, message.getPayload());
}
protected ResponseEntity<String> executeRequest(
URI url, HttpString method, HttpHeaders headers, @Nullable String body) {
CountDownLatch latch = new CountDownLatch(1);
List<ClientResponse> responses = new CopyOnWriteArrayList<>();
try {
ClientConnection connection =
this.httpClient.connect(url, this.worker, this.bufferPool, this.optionMap).get();
try {
ClientRequest request = new ClientRequest().setMethod(method).setPath(url.getPath());
request.getRequestHeaders().add(HttpString.tryFromString(HttpHeaders.HOST), url.getHost());
if (StringUtils.hasLength(body)) {
HttpString headerName = HttpString.tryFromString(HttpHeaders.CONTENT_LENGTH);
request.getRequestHeaders().add(headerName, body.length());
}
addHttpHeaders(request, headers);
connection.sendRequest(request, createRequestCallback(body, responses, latch));
latch.await();
ClientResponse response = responses.iterator().next();
HttpStatusCode status = HttpStatusCode.valueOf(response.getResponseCode());
HttpHeaders responseHeaders = toHttpHeaders(response.getResponseHeaders());
String responseBody = response.getAttachment(RESPONSE_BODY);
return (responseBody != null ?
new ResponseEntity<>(responseBody, responseHeaders, status) :
new ResponseEntity<>(responseHeaders, status));
}
finally {
IoUtils.safeClose(connection);
}
}
catch (IOException ex) {
throw new SockJsTransportFailureException("Failed to execute request to " + url, ex);
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
throw new SockJsTransportFailureException("Interrupted while processing request to " + url, ex);
}
}
private ClientCallback<ClientExchange> createRequestCallback(final @Nullable String body,
final List<ClientResponse> responses, final CountDownLatch latch) {
return new ClientCallback<>() {
@Override
public void completed(ClientExchange result) {
result.setResponseListener(new ClientCallback<ClientExchange>() {
@Override
public void completed(final ClientExchange result) {
responses.add(result.getResponse());
new StringReadChannelListener(result.getConnection().getBufferPool()) {
@Override
protected void stringDone(String string) {
result.getResponse().putAttachment(RESPONSE_BODY, string);
latch.countDown();
}
@Override
protected void error(IOException ex) {
onFailure(latch, ex);
}
}.setup(result.getResponseChannel());
}
@Override
public void failed(IOException ex) {
onFailure(latch, ex);
}
});
try {
if (body != null) {
result.getRequestChannel().write(ByteBuffer.wrap(body.getBytes()));
}
result.getRequestChannel().shutdownWrites();
if (!result.getRequestChannel().flush()) {
result.getRequestChannel().getWriteSetter()
.set(ChannelListeners.<StreamSinkChannel>flushingChannelListener(null, null));
result.getRequestChannel().resumeWrites();
}
}
catch (IOException ex) {
onFailure(latch, ex);
}
}
@Override
public void failed(IOException ex) {
onFailure(latch, ex);
}
private void onFailure(CountDownLatch latch, IOException ex) {
latch.countDown();
throw new SockJsTransportFailureException("Failed to execute request", ex);
}
};
}
private class SockJsResponseListener implements ChannelListener<StreamSourceChannel> {
private final TransportRequest request;
private final ClientConnection connection;
private final URI url;
private final HttpHeaders headers;
private final XhrClientSockJsSession session;
private final CompletableFuture<WebSocketSession> connectFuture;
private final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
public SockJsResponseListener(TransportRequest request, ClientConnection connection, URI url,
HttpHeaders headers, XhrClientSockJsSession sockJsSession,
CompletableFuture<WebSocketSession> connectFuture) {
this.request = request;
this.connection = connection;
this.url = url;
this.headers = headers;
this.session = sockJsSession;
this.connectFuture = connectFuture;
}
public void setup(StreamSourceChannel channel) {
channel.suspendReads();
channel.getReadSetter().set(this);
channel.resumeReads();
}
@Override
public void handleEvent(StreamSourceChannel channel) {
if (this.session.isDisconnected()) {
if (logger.isDebugEnabled()) {
logger.debug("SockJS sockJsSession closed, closing response.");
}
IoUtils.safeClose(this.connection);
throw new SockJsException("Session closed.", this.session.getId(), null);
}
try (PooledByteBuffer pooled = bufferPool.allocate()) {
int r;
do {
ByteBuffer buffer = pooled.getBuffer();
buffer.clear();
r = channel.read(buffer);
buffer.flip();
if (r == 0) {
return;
}
else if (r == -1) {
onSuccess();
}
else {
while (buffer.hasRemaining()) {
int b = buffer.get();
if (b == '\n') {
handleFrame();
}
else {
this.outputStream.write(b);
}
}
}
}
while (r > 0);
}
catch (IOException exc) {
onFailure(exc);
}
}
private void handleFrame() {
String content = StreamUtils.copyToString(this.outputStream, SockJsFrame.CHARSET);
this.outputStream.reset();
if (logger.isTraceEnabled()) {
logger.trace("XHR content received: " + content);
}
if (!PRELUDE.equals(content)) {
this.session.handleFrame(content);
}
}
public void onSuccess() {
if (this.outputStream.size() > 0) {
handleFrame();
}
if (logger.isTraceEnabled()) {
logger.trace("XHR receive request completed.");
}
IoUtils.safeClose(this.connection);
executeReceiveRequest(this.request, this.url, this.headers, this.session, this.connectFuture);
}
public void onFailure(Throwable failure) {
IoUtils.safeClose(this.connection);
if (this.connectFuture.completeExceptionally(failure)) {
return;
}
if (this.session.isDisconnected()) {
this.session.afterTransportClosed(null);
}
else {
this.session.handleTransportError(failure);
this.session.afterTransportClosed(new CloseStatus(1006, failure.getMessage()));
}
}
}
}
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