Not add inboundStreamHandler for outbound streams created by Http2MultiplexCodec.

Motivation:

We must not add the inboundStreamHandler for outbound streams creates by Http2MultiplexCodec as the user will specify a handler via Http2StreamChannelBootstrap.

Modifications:

- Check if the stream is for outbound and if so not add the inboundStreamHandler to the pipeline
- Update tests so this is covered.

Result:

Fixes [#7178]

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2MultiplexCodec.java

@@ -239,7 +239,7 @@ public class Http2MultiplexCodec extends Http2FrameCodec {
                     break;
                 }
                 // fall-trough
-                DefaultHttp2StreamChannel childChannel = new DefaultHttp2StreamChannel(stream);
+                DefaultHttp2StreamChannel childChannel = new DefaultHttp2StreamChannel(stream, false);
                 ChannelFuture future = ctx.channel().eventLoop().register(childChannel);
                 if (future.isDone()) {
                     registerDone(future);
@@ -266,7 +266,7 @@ public class Http2MultiplexCodec extends Http2FrameCodec {
 
     // TODO: This is most likely not the best way to expose this, need to think more about it.
     final Http2StreamChannel newOutboundStream() {
-        return new DefaultHttp2StreamChannel(newStream());
+        return new DefaultHttp2StreamChannel(newStream(), true);
     }
 
     @Override
@@ -403,6 +403,7 @@ public class Http2MultiplexCodec extends Http2FrameCodec {
         private final ChannelPipeline pipeline;
         private final Http2FrameStream stream;
         private final ChannelPromise closePromise;
+        private final boolean outbound;
 
         private volatile boolean registered;
         private volatile boolean writable;
@@ -427,8 +428,9 @@ public class Http2MultiplexCodec extends Http2FrameCodec {
         // channelReadComplete(...)
         DefaultHttp2StreamChannel next;
 
-        DefaultHttp2StreamChannel(Http2FrameStream stream) {
+        DefaultHttp2StreamChannel(Http2FrameStream stream, boolean outbound) {
             this.stream = stream;
+            this.outbound = outbound;
             ((Http2MultiplexCodecStream) stream).channel = this;
             pipeline = new DefaultChannelPipeline(this) {
                 @Override
@@ -791,8 +793,10 @@ public class Http2MultiplexCodec extends Http2FrameCodec {
 
                 registered = true;
 
-                // Add the handler to the pipeline now that we are registered.
-                pipeline().addLast(inboundStreamHandler);
+                if (!outbound) {
+                    // Add the handler to the pipeline now that we are registered.
+                    pipeline().addLast(inboundStreamHandler);
+                }
 
                 promise.setSuccess();
 

codec-http2/src/test/java/io/netty/handler/codec/http2/Http2MultiplexCodecBuilderTest.java

@@ -32,6 +32,7 @@ import io.netty.channel.local.LocalChannel;
 import io.netty.channel.local.LocalServerChannel;
 import org.junit.After;
 import org.junit.AfterClass;
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -82,7 +83,12 @@ public class Http2MultiplexCodecBuilderTest {
         Bootstrap cb = new Bootstrap()
                 .channel(LocalChannel.class)
                 .group(group)
-                .handler(new Http2MultiplexCodecBuilder(false, new TestChannelInitializer()).build());
+                .handler(new Http2MultiplexCodecBuilder(false, new ChannelInitializer<Channel>() {
+                    @Override
+                    protected void initChannel(Channel ch) throws Exception {
+                        Assert.fail("Should not be called for outbound streams");
+                    }
+                }).build());
         clientChannel = cb.connect(serverAddress).sync().channel();
         assertTrue(serverChannelLatch.await(5, SECONDS));
     }