@Override
public boolean sendMeta(ServerSession session, ServerMessage.Mutable message) {
if (Channel.META_CONNECT.equals(message.getChannel())) {
int connects = this.connects.incrementAndGet();
if (connects == 1) {
// Fake the removal of the session due to timeout
bayeuxServer.removeServerSession(session, true);
}
}
return true;
}
@Override
public boolean rcvMeta(ServerSession from, ServerMessage.Mutable message) {
if (Channel.META_CONNECT.equals(message.getChannel())) {
int connects = this.connects.incrementAndGet();
if (connects == 2) {
try {
Thread.sleep(delay);
} catch (InterruptedException x) {
return false;
}
}
}
return true;
}
@Override
public boolean sendMeta(ServerSession to, Mutable message) {
if (Channel.META_HANDSHAKE.equals(message.getChannel())
|| Channel.META_CONNECT.equals(message.getChannel())
|| Channel.META_DISCONNECT.equals(message.getChannel())) {
AbstractHttpTransport transport = (AbstractHttpTransport) bayeux.getCurrentTransport();
HttpServletRequest request = transport.getCurrentRequest();
if (request != null) {
String uri = request.getRequestURI();
message.getExt(true).put("uri", uri);
}
}
return true;
}
@Override
public boolean sendMeta(ClientSession session, Mutable message) {
if (Channel.META_HANDSHAKE.equals(message.getChannel())) {
_serverSupportsAcks = false;
_transientBatch = 0;
_batch = 0;
_size = 0;
message.getExt(true).put(ACK_FIELD, Boolean.TRUE);
} else if (Channel.META_CONNECT.equals(message.getChannel())) {
if (_serverSupportsAcks) {
message.getExt(true).put(ACK_FIELD, _batch);
}
}
return true;
}
@Override
public boolean rcvMeta(ClientSession session, Mutable message) {
if (Channel.META_HANDSHAKE.equals(message.getChannel())) {
Map<String, Object> ext = message.getExt(false);
if (ext != null) {
Object field = ext.get(ACK_FIELD);
if (field instanceof Map) {
// New format.
@SuppressWarnings("unchecked")
Map<String, Object> ack = (Map<String, Object>) field;
_serverSupportsAcks = Boolean.TRUE.equals(ack.get("enabled"));
// Check if there are messages.
Object batch = ack.get("batch");
Object size = ack.get("size");
if (batch instanceof Number && size instanceof Number) {
_transientBatch = ((Number) batch).longValue();
_size = ((Number) size).intValue();
}
} else {
// Old format.
_serverSupportsAcks = Boolean.TRUE.equals(field);
}
}
} else if (Channel.META_CONNECT.equals(message.getChannel())
&& message.isSuccessful()
&& _serverSupportsAcks) {
Map<String, Object> ext = message.getExt(false);
if (ext != null) {
Object ack = ext.get(ACK_FIELD);
if (ack instanceof Number) {
_batch = ((Number) ack).longValue();
}
}
}
return true;
}
@Override
public void handle(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
// Is this a resumed connect?
LongPollScheduler scheduler =
(LongPollScheduler) request.getAttribute(LongPollScheduler.ATTRIBUTE);
if (scheduler == null) {
// No - process messages
// Remember if we start a batch
boolean batch = false;
// Don't know the session until first message or handshake response.
ServerSessionImpl session = null;
boolean connect = false;
try {
ServerMessage.Mutable[] messages = parseMessages(request);
if (messages == null) return;
PrintWriter writer = null;
for (ServerMessage.Mutable message : messages) {
// Is this a connect?
connect = Channel.META_CONNECT.equals(message.getChannel());
// Get the session from the message
String client_id = message.getClientId();
if (session == null || client_id != null && !client_id.equals(session.getId())) {
session = (ServerSessionImpl) getBayeux().getSession(client_id);
if (_autoBatch && !batch && session != null && !connect && !message.isMeta()) {
// start a batch to group all resulting messages into a single response.
batch = true;
session.startBatch();
}
} else if (!session.isHandshook()) {
batch = false;
session = null;
}
if (connect && session != null) {
// cancel previous scheduler to cancel any prior waiting long poll
// this should also dec the browser ID
session.setScheduler(null);
}
boolean wasConnected = session != null && session.isConnected();
// Forward handling of the message.
// The actual reply is return from the call, but other messages may
// also be queued on the session.
ServerMessage.Mutable reply = bayeuxServerHandle(session, message);
// Do we have a reply ?
if (reply != null) {
if (session == null) {
// This must be a handshake, extract a session from the reply
session = (ServerSessionImpl) getBayeux().getSession(reply.getClientId());
// Get the user agent while we are at it, and add the browser ID cookie
if (session != null) {
String userAgent = request.getHeader("User-Agent");
session.setUserAgent(userAgent);
String browserId = findBrowserId(request);
if (browserId == null) setBrowserId(request, response);
}
} else {
// Special handling for connect
if (connect) {
try {
writer = sendQueue(request, response, session, writer);
// If the writer is non null, we have already started sending a response, so we
// should not suspend
if (writer == null && reply.isSuccessful() && session.isQueueEmpty()) {
// Detect if we have multiple sessions from the same browser
// Note that CORS requests do not send cookies, so we need to handle them
// specially
// CORS requests always have the Origin header
String browserId = findBrowserId(request);
boolean allowSuspendConnect;
if (browserId != null) allowSuspendConnect = incBrowserId(browserId);
else
allowSuspendConnect =
_allowMultiSessionsNoBrowser || request.getHeader("Origin") != null;
if (allowSuspendConnect) {
long timeout = session.calculateTimeout(getTimeout());
// Support old clients that do not send advice:{timeout:0} on the first
// connect
if (timeout > 0 && wasConnected && session.isConnected()) {
// Suspend and wait for messages
Continuation continuation = ContinuationSupport.getContinuation(request);
continuation.setTimeout(timeout);
continuation.suspend(response);
scheduler = new LongPollScheduler(session, continuation, reply, browserId);
session.setScheduler(scheduler);
request.setAttribute(LongPollScheduler.ATTRIBUTE, scheduler);
reply = null;
metaConnectSuspended(request, session, timeout);
} else {
decBrowserId(browserId);
}
} else {
// There are multiple sessions from the same browser
Map<String, Object> advice = reply.getAdvice(true);
if (browserId != null) advice.put("multiple-clients", true);
if (_multiSessionInterval > 0) {
advice.put(Message.RECONNECT_FIELD, Message.RECONNECT_RETRY_VALUE);
advice.put(Message.INTERVAL_FIELD, _multiSessionInterval);
} else {
advice.put(Message.RECONNECT_FIELD, Message.RECONNECT_NONE_VALUE);
reply.setSuccessful(false);
}
session.reAdvise();
}
}
} finally {
if (reply != null && session.isConnected())
session.startIntervalTimeout(getInterval());
}
} else {
if (!isMetaConnectDeliveryOnly() && !session.isMetaConnectDeliveryOnly()) {
writer = sendQueue(request, response, session, writer);
}
}
}
// If the reply has not been otherwise handled, send it
if (reply != null) {
if (connect && session != null && !session.isConnected())
reply.getAdvice(true).put(Message.RECONNECT_FIELD, Message.RECONNECT_NONE_VALUE);
reply = getBayeux().extendReply(session, session, reply);
if (reply != null) {
getBayeux().freeze(reply);
writer = send(request, response, writer, reply);
}
}
}
// Disassociate the reply
message.setAssociated(null);
}
if (writer != null) complete(writer);
} catch (ParseException x) {
handleJSONParseException(request, response, x.getMessage(), x.getCause());
} finally {
// If we started a batch, end it now
if (batch) {
boolean ended = session.endBatch();
// Flush session if not done by the batch, since some browser order <script> requests
if (!ended && isAlwaysFlushingAfterHandle()) session.flush();
} else if (session != null && !connect && isAlwaysFlushingAfterHandle()) {
session.flush();
}
}
} else {
// Get the resumed session
ServerSessionImpl session = scheduler.getSession();
metaConnectResumed(request, session);
PrintWriter writer;
try {
// Send the message queue
writer = sendQueue(request, response, session, null);
} finally {
// We need to start the interval timeout before the connect reply
// otherwise we open up a race condition where the client receives
// the connect reply and sends a new connect request before we start
// the interval timeout, which will be wrong.
// We need to put this into a finally block in case sending the queue
// throws an exception (for example because the client is gone), so that
// we start the interval timeout that is important to sweep the session
if (session.isConnected()) session.startIntervalTimeout(getInterval());
}
// Send the connect reply
ServerMessage.Mutable reply = scheduler.getReply();
if (!session.isConnected())
reply.getAdvice(true).put(Message.RECONNECT_FIELD, Message.RECONNECT_NONE_VALUE);
reply = getBayeux().extendReply(session, session, reply);
if (reply != null) {
getBayeux().freeze(reply);
writer = send(request, response, writer, reply);
}
complete(writer);
}
}
@Test
public void testStateUnSubscribes() throws Exception {
final BlockingArrayQueue<Object> results = new BlockingArrayQueue<>();
final AtomicBoolean failHandShake = new AtomicBoolean(true);
LongPollingTransport transport =
new LongPollingTransport(null, httpClient) {
@Override
protected void customize(Request request) {
if (failHandShake.compareAndSet(true, false)) {
request.listener(
new Request.Listener.Adapter() {
@Override
public void onBegin(Request request) {
request.header(HttpHeader.HOST, null);
}
});
}
}
};
BayeuxClient client = new BayeuxClient(cometdURL, transport);
client
.getChannel("/meta/*")
.addListener(
new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {
results.offer(message);
}
});
client.handshake();
// Subscribe without waiting
client
.getChannel("/foo/bar")
.subscribe(
new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {}
});
// First handshake fails
Message message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
Assert.assertEquals(Channel.META_HANDSHAKE, message.getChannel());
Assert.assertFalse(message.isSuccessful());
// Second handshake works
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
Assert.assertEquals(Channel.META_HANDSHAKE, message.getChannel());
Assert.assertTrue(message.isSuccessful());
String id = client.getId();
Assert.assertNotNull(id);
boolean subscribe = false;
boolean connect = false;
for (int i = 0; i < 2; ++i) {
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
subscribe |= Channel.META_SUBSCRIBE.equals(message.getChannel());
connect |= Channel.META_CONNECT.equals(message.getChannel());
}
Assert.assertTrue(subscribe);
Assert.assertTrue(connect);
// Subscribe again
client
.getChannel("/foo/bar")
.subscribe(
new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {}
});
// No second subscribe sent, be sure to wait less than the timeout
// otherwise we get a connect message
message = (Message) results.poll(5, TimeUnit.SECONDS);
Assert.assertNull(message);
client.disconnect();
boolean disconnect = false;
connect = false;
for (int i = 0; i < 2; ++i) {
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
disconnect |= Channel.META_DISCONNECT.equals(message.getChannel());
connect |= Channel.META_CONNECT.equals(message.getChannel());
}
Assert.assertTrue(disconnect);
Assert.assertTrue(connect);
Assert.assertTrue(client.waitFor(5000, BayeuxClient.State.DISCONNECTED));
// Rehandshake
client.handshake();
Assert.assertTrue(client.waitFor(5000, BayeuxClient.State.CONNECTED));
results.clear();
// Subscribe again
client
.getChannel("/foo/bar")
.subscribe(
new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {}
});
// Subscribe is sent, skip the connect message if present
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
if (Channel.META_CONNECT.equals(message.getChannel()))
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertEquals(Channel.META_SUBSCRIBE, message.getChannel());
// Restart server
int port = connector.getLocalPort();
server.stop();
server.join();
Assert.assertTrue(client.waitFor(5000, BayeuxClient.State.UNCONNECTED));
connector.setPort(port);
server.start();
bayeux = (BayeuxServerImpl) context.getServletContext().getAttribute(BayeuxServer.ATTRIBUTE);
Assert.assertTrue(client.waitFor(5000, BayeuxClient.State.CONNECTED));
results.clear();
// Subscribe again
client
.getChannel("/foo/bar")
.subscribe(
new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {}
});
// Subscribe is sent, skip the connect message if present
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertNotNull(message);
if (Channel.META_CONNECT.equals(message.getChannel()))
message = (Message) results.poll(10, TimeUnit.SECONDS);
Assert.assertEquals(Channel.META_SUBSCRIBE, message.getChannel());
disconnectBayeuxClient(client);
}
@Override
public void send(final TransportListener listener, final Message.Mutable... messages) {
String url = getURL();
final URI uri = URI.create(url);
if (_appendMessageType && messages.length == 1 && messages[0].isMeta()) {
String type = messages[0].getChannel().substring(Channel.META.length());
if (url.endsWith("/")) url = url.substring(0, url.length() - 1);
url += type;
}
final Request request = _httpClient.newRequest(url).method(HttpMethod.POST);
request.header(HttpHeader.CONTENT_TYPE.asString(), "application/json;charset=UTF-8");
StringBuilder builder = new StringBuilder();
for (HttpCookie cookie : getCookieStore().get(uri)) {
builder.setLength(0);
builder.append(cookie.getName()).append("=").append(cookie.getValue());
request.header(HttpHeader.COOKIE.asString(), builder.toString());
}
request.content(new StringContentProvider(generateJSON(messages)));
customize(request);
synchronized (this) {
if (_aborted) throw new IllegalStateException("Aborted");
_requests.add(request);
}
request.listener(
new Request.Listener.Empty() {
@Override
public void onHeaders(Request request) {
listener.onSending(messages);
}
});
long maxNetworkDelay = _maxNetworkDelay;
if (messages.length == 1 && Channel.META_CONNECT.equals(messages[0].getChannel())) {
Map<String, Object> advice = messages[0].getAdvice();
if (advice == null) advice = _advice;
if (advice != null) {
Object timeout = advice.get("timeout");
if (timeout instanceof Number) maxNetworkDelay += ((Number) timeout).longValue();
else if (timeout != null) maxNetworkDelay += Long.parseLong(timeout.toString());
}
}
// Set the idle timeout for this request larger than the total timeout
// so there are no races between the two timeouts
request.idleTimeout(maxNetworkDelay * 2, TimeUnit.MILLISECONDS);
request.timeout(maxNetworkDelay, TimeUnit.MILLISECONDS);
request.send(
new BufferingResponseListener() {
@Override
public boolean onHeader(Response response, HttpField field) {
// We do not allow cookies to be handled by HttpClient, since one
// HttpClient instance is shared by multiple BayeuxClient instances.
// Instead, we store the cookies in the BayeuxClient instance.
switch (field.getHeader()) {
case SET_COOKIE:
case SET_COOKIE2:
Map<String, List<String>> cookies = new HashMap<>(1);
cookies.put(field.getName(), Collections.singletonList(field.getValue()));
storeCookies(uri, cookies);
return false;
default:
return true;
}
}
private void storeCookies(URI uri, Map<String, List<String>> cookies) {
try {
_cookieManager.put(uri, cookies);
} catch (IOException x) {
logger.debug("", x);
}
}
@Override
public void onComplete(Result result) {
synchronized (LongPollingTransport.this) {
_requests.remove(result.getRequest());
}
if (result.isFailed()) {
listener.onFailure(result.getFailure(), messages);
return;
}
Response response = result.getResponse();
int status = response.getStatus();
if (status == HttpStatus.OK_200) {
String content = getContentAsString();
if (content != null && content.length() > 0) {
try {
List<Message.Mutable> messages = parseMessages(content);
debug("Received messages {}", messages);
for (Message.Mutable message : messages) {
if (message.isSuccessful()
&& Channel.META_CONNECT.equals(message.getChannel())) {
Map<String, Object> advice = message.getAdvice();
if (advice != null && advice.get("timeout") != null) _advice = advice;
}
}
listener.onMessages(messages);
} catch (ParseException x) {
listener.onFailure(x, messages);
}
} else {
Map<String, Object> failure = new HashMap<>(2);
// Convert the 200 into 204 (no content)
failure.put("httpCode", 204);
TransportException x = new TransportException(failure);
listener.onFailure(x, messages);
}
} else {
Map<String, Object> failure = new HashMap<>(2);
failure.put("httpCode", status);
TransportException x = new TransportException(failure);
listener.onFailure(x, messages);
}
}
});
}
public boolean sendMeta(ServerSession to, ServerMessage.Mutable message) {
if (Channel.META_CONNECT.equals(message.getChannel())) {
sendMetas.add(message);
}
return true;
}