Fixed handling of INITIAL_WINDOW_SIZE setting.

It must update only stream windows, and not the session window.

jetty-http2/http2-client/src/main/java/org/eclipse/jetty/http2/client/HTTP2ClientConnectionFactory.java

@@ -23,6 +23,7 @@ import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.Executor;
 
+import org.eclipse.jetty.http2.FlowControl;
 import org.eclipse.jetty.http2.HTTP2Connection;
 import org.eclipse.jetty.http2.HTTP2FlowControl;
 import org.eclipse.jetty.http2.ISession;
@@ -59,7 +60,7 @@ public class HTTP2ClientConnectionFactory implements ClientConnectionFactory
         Promise<Session> promise = (Promise<Session>)context.get(SESSION_PROMISE_CONTEXT_KEY);
 
         Generator generator = new Generator(byteBufferPool, 4096);
-        HTTP2ClientSession session = new HTTP2ClientSession(scheduler, endPoint, generator, listener, new HTTP2FlowControl(65535));
+        HTTP2ClientSession session = new HTTP2ClientSession(scheduler, endPoint, generator, listener, new HTTP2FlowControl(FlowControl.DEFAULT_WINDOW_SIZE));
         Parser parser = new Parser(byteBufferPool, session, 4096, 8192);
         return new HTTP2ClientConnection(client, byteBufferPool, executor, endPoint, parser, session, 8192, promise, listener);
     }

jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/FlowControlTest.java

@@ -32,6 +32,7 @@ import java.util.concurrent.atomic.AtomicReference;
 import org.eclipse.jetty.http.HttpFields;
 import org.eclipse.jetty.http.HttpVersion;
 import org.eclipse.jetty.http.MetaData;
+import org.eclipse.jetty.http2.FlowControl;
 import org.eclipse.jetty.http2.api.Session;
 import org.eclipse.jetty.http2.api.Stream;
 import org.eclipse.jetty.http2.api.server.ServerSessionListener;
@@ -334,17 +335,21 @@ public class FlowControlTest extends AbstractTest
     public void testSessionStalledStallsNewStreams() throws Exception
     {
         final int windowSize = 1024;
-        final CountDownLatch settingsLatch = new CountDownLatch(1);
         startServer(new ServerSessionListener.Adapter()
         {
-            @Override
-            public void onSettings(Session session, SettingsFrame frame)
-            {
-                settingsLatch.countDown();
-            }
-
             @Override
             public Stream.Listener onNewStream(Stream stream, HeadersFrame requestFrame)
+            {
+                MetaData.Request request = (MetaData.Request)requestFrame.getMetaData();
+                if ("POST".equalsIgnoreCase(request.getMethod()))
+                {
+                    // Send data to consume the session window.
+                    ByteBuffer data = ByteBuffer.allocate(FlowControl.DEFAULT_WINDOW_SIZE - windowSize);
+                    DataFrame dataFrame = new DataFrame(stream.getId(), data, true);
+                    stream.data(dataFrame, Callback.Adapter.INSTANCE);
+                    return null;
+                }
+                else
                 {
                     // For every stream, send down half the window size of data.
                     MetaData.Response metaData = new MetaData.Response(HttpVersion.HTTP_2, 200, new HttpFields());
@@ -354,33 +359,30 @@ public class FlowControlTest extends AbstractTest
                     stream.data(dataFrame, Callback.Adapter.INSTANCE);
                     return null;
                 }
+            }
         });
 
         Session session = newClient(new Session.Listener.Adapter());
 
-        Map<Integer, Integer> settings = new HashMap<>();
+        // First request is just to consume the session window.
-        settings.put(SettingsFrame.INITIAL_WINDOW_SIZE, windowSize);
+        final CountDownLatch prepareLatch = new CountDownLatch(1);
-        session.settings(new SettingsFrame(settings, false), Callback.Adapter.INSTANCE);
+        MetaData.Request request1 = newRequest("POST", new HttpFields());
-
-        Assert.assertTrue(settingsLatch.await(5, TimeUnit.SECONDS));
-
-        final AtomicReference<Callback> callbackRef1 = new AtomicReference<>();
-        final AtomicReference<Callback> callbackRef2 = new AtomicReference<>();
-
-        // First request will consume half the session window.
-        MetaData.Request request1 = newRequest("GET", new HttpFields());
         session.newStream(new HeadersFrame(0, request1, null, true), new Promise.Adapter<Stream>(), new Stream.Listener.Adapter()
         {
             @Override
             public void onData(Stream stream, DataFrame frame, Callback callback)
             {
-                // Do not consume it to stall flow control.
+                // Do not consume the data to reduce the session window.
-                callbackRef1.set(callback);
+                if (frame.isEndStream())
+                    prepareLatch.countDown();
             }
         });
+        Assert.assertTrue(prepareLatch.await(5, TimeUnit.SECONDS));
 
-        // Second request will consume the session window, which is now stalled.
+        final AtomicReference<Callback> callbackRef2 = new AtomicReference<>();
-        // A third request will not be able to receive data.
+        final AtomicReference<Callback> callbackRef3 = new AtomicReference<>();
+
+        // Second request will consume half the session window.
         MetaData.Request request2 = newRequest("GET", new HttpFields());
         session.newStream(new HeadersFrame(0, request2, null, true), new Promise.Adapter<Stream>(), new Stream.Listener.Adapter()
         {
@@ -392,10 +394,23 @@ public class FlowControlTest extends AbstractTest
             }
         });
 
-        // Third request is now stalled.
+        // Third request will consume the session window, which is now stalled.
-        final CountDownLatch latch = new CountDownLatch(1);
+        // A fourth request will not be able to receive data.
         MetaData.Request request3 = newRequest("GET", new HttpFields());
         session.newStream(new HeadersFrame(0, request3, null, true), new Promise.Adapter<Stream>(), new Stream.Listener.Adapter()
+        {
+            @Override
+            public void onData(Stream stream, DataFrame frame, Callback callback)
+            {
+                // Do not consume it to stall flow control.
+                callbackRef3.set(callback);
+            }
+        });
+
+        // Fourth request is now stalled.
+        final CountDownLatch latch = new CountDownLatch(1);
+        MetaData.Request request4 = newRequest("GET", new HttpFields());
+        session.newStream(new HeadersFrame(0, request4, null, true), new Promise.Adapter<Stream>(), new Stream.Listener.Adapter()
         {
             @Override
             public void onData(Stream stream, DataFrame frame, Callback callback)
@@ -409,9 +424,9 @@ public class FlowControlTest extends AbstractTest
         // Verify that the data does not arrive because the server session is stalled.
         Assert.assertFalse(latch.await(1, TimeUnit.SECONDS));
 
-        // Consume the data of the second response.
+        // Consume the data of the third response.
         // This will open up the session window, allowing the third stream to send data.
-        Callback callback2 = callbackRef2.getAndSet(null);
+        Callback callback2 = callbackRef3.getAndSet(null);
         if (callback2 != null)
             callback2.succeeded();
 

jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/FlowControl.java

@@ -22,6 +22,8 @@ import org.eclipse.jetty.http2.frames.WindowUpdateFrame;
 
 public interface FlowControl
 {
+    public static int DEFAULT_WINDOW_SIZE = 65535;
+
     public void onNewStream(IStream stream);
 
     public int getInitialWindowSize();

jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2FlowControl.java

@@ -54,10 +54,7 @@ public class HTTP2FlowControl implements FlowControl
         this.initialWindowSize = initialWindowSize;
         int delta = initialWindowSize - windowSize;
 
-        // Update the session's window size.
+        // SPEC: updates of the initial window size only affect stream windows, not session's.
-        session.onUpdateWindowSize(null, new WindowUpdateFrame(0, delta));
-
-        // Update the streams' window size.
         for (Stream stream : session.getStreams())
             session.onUpdateWindowSize((IStream)stream, new WindowUpdateFrame(stream.getId(), delta));
     }

jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java

@@ -213,7 +213,7 @@ public abstract class HTTP2Session implements ISession, Parser.Listener
         if (settings.containsKey(SettingsFrame.MAX_FRAME_SIZE))
         {
             int maxFrameSize = settings.get(SettingsFrame.MAX_FRAME_SIZE);
-            // Spec: check the max frame size is sane.
+            // SPEC: check the max frame size is sane.
             if (maxFrameSize < Frame.DEFAULT_MAX_LENGTH || maxFrameSize > Frame.MAX_MAX_LENGTH)
             {
                 onConnectionFailure(ErrorCodes.PROTOCOL_ERROR, "invalid_settings_max_frame_size");

jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/AbstractHTTP2ServerConnectionFactory.java

@@ -20,6 +20,7 @@ package org.eclipse.jetty.http2.server;
 
 import java.util.concurrent.Executor;
 
+import org.eclipse.jetty.http2.FlowControl;
 import org.eclipse.jetty.http2.HTTP2Connection;
 import org.eclipse.jetty.http2.HTTP2FlowControl;
 import org.eclipse.jetty.http2.ISession;
@@ -36,7 +37,7 @@ import org.eclipse.jetty.server.Connector;
 public abstract class AbstractHTTP2ServerConnectionFactory extends AbstractConnectionFactory
 {
     private int maxHeaderTableSize = 4096;
-    private int initialWindowSize = 65535;
+    private int initialWindowSize = FlowControl.DEFAULT_WINDOW_SIZE;
     private int maxConcurrentStreams = -1;
 
     public AbstractHTTP2ServerConnectionFactory()