Add HTTP/2 Netty tiles example

Motivation:

Adding an example that showcases Netty’s HTTP/2 codec and that is
slightly more complex than the existing hello-world example. It is
based on the Gopher tiles example available here:
https://http2.golang.org/gophertiles?latency=0

Modifications:

Moved current http2 example to http2/helloworld.
Added http2 tiles example under http2/tiles.

Result:

A Netty tiles example is available.
This commit is contained in:
Leonardo Freitas Gomes 2015-04-11 02:57:20 +02:00 committed by Scott Mitchell
parent c6d61f9b43
commit 781a85520c
220 changed files with 756 additions and 16 deletions

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@ -14,6 +14,15 @@
*/
package io.netty.example.http2;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.http.QueryStringDecoder;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* Utility methods used by the example client and server.
*/
@ -24,5 +33,51 @@ public final class Http2ExampleUtil {
*/
public static final String UPGRADE_RESPONSE_HEADER = "Http-To-Http2-Upgrade";
/**
* Size of the block to be read from the input stream.
*/
private static final int BLOCK_SIZE = 1024;
private Http2ExampleUtil() { }
/**
* @param string the string to be converted to an integer.
* @param defaultValue the default value
* @return the integer value of a string or the default value, if the string is either null or empty.
*/
public static int toInt(String string, int defaultValue) {
if (string != null && !string.isEmpty()) {
return Integer.valueOf(string);
}
return defaultValue;
}
/**
* Reads an InputStream into a byte array.
* @param input the InputStream.
* @return a byte array representation of the InputStream.
* @throws IOException if an I/O exception of some sort happens while reading the InputStream.
*/
public static ByteBuf toByteBuf(InputStream input) throws IOException {
ByteBuf buf = Unpooled.buffer();
int n = 0;
do {
n = buf.writeBytes(input, BLOCK_SIZE);
} while (n > 0);
return buf;
}
/**
* @param query the decoder of query string
* @param key the key to lookup
* @return the first occurrence of that key in the string parameters
*/
public static String firstValue(QueryStringDecoder query, String key) {
checkNotNull(query, "Query can't be null!");
List<String> values = query.parameters().get(key);
if (values == null || values.isEmpty()) {
return null;
}
return values.get(0);
}
}

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@ -12,7 +12,7 @@
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http2.client;
package io.netty.example.http2.helloworld.client;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;

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@ -12,7 +12,7 @@
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http2.client;
package io.netty.example.http2.helloworld.client;
import static io.netty.handler.logging.LogLevel.INFO;

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@ -12,7 +12,7 @@
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http2.client;
package io.netty.example.http2.helloworld.client;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;

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@ -12,7 +12,7 @@
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http2.client;
package io.netty.example.http2.helloworld.client;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;

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@ -13,7 +13,7 @@
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.http2.server;
package io.netty.example.http2.helloworld.server;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import io.netty.buffer.ByteBuf;

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@ -13,7 +13,7 @@
* the License.
*/
package io.netty.example.http2.server;
package io.netty.example.http2.helloworld.server;
import static io.netty.buffer.Unpooled.copiedBuffer;
import static io.netty.buffer.Unpooled.unreleasableBuffer;

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@ -12,7 +12,7 @@
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http2.server;
package io.netty.example.http2.helloworld.server;
import io.netty.channel.ChannelHandler;
import io.netty.handler.codec.http2.Http2ConnectionHandler;

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@ -14,7 +14,7 @@
* under the License.
*/
package io.netty.example.http2.server;
package io.netty.example.http2.helloworld.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
@ -71,12 +71,11 @@ public final class Http2Server {
sslCtx = null;
}
// Configure the server.
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
EventLoopGroup group = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.option(ChannelOption.SO_BACKLOG, 1024);
b.group(bossGroup, workerGroup)
b.group(group)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new Http2ServerInitializer(sslCtx));
@ -88,8 +87,7 @@ public final class Http2Server {
ch.closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
group.shutdownGracefully();
}
}
}

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@ -14,7 +14,7 @@
* under the License.
*/
package io.netty.example.http2.server;
package io.netty.example.http2.helloworld.server;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

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@ -0,0 +1,74 @@
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.buffer.Unpooled.copiedBuffer;
import static io.netty.buffer.Unpooled.unmodifiableBuffer;
import static io.netty.buffer.Unpooled.unreleasableBuffer;
import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import static io.netty.util.CharsetUtil.UTF_8;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderUtil;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http2.Http2CodecUtil;
/**
* Handles the exceptional case where HTTP 1.x was negotiated under TLS.
*/
public final class FallbackRequestHandler extends SimpleChannelInboundHandler<HttpRequest> {
private static final ByteBuf response = unmodifiableBuffer(unreleasableBuffer(copiedBuffer("<!DOCTYPE html>"
+ "<html><body><h2>To view the example you need a browser that supports HTTP/2 ("
+ Http2CodecUtil.TLS_UPGRADE_PROTOCOL_NAME
+ ")</h2></body></html>", UTF_8)));
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpRequest req) throws Exception {
if (HttpHeaderUtil.is100ContinueExpected(req)) {
ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
}
ByteBuf content = ctx.alloc().buffer();
content.writeBytes(response.duplicate());
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
ctx.write(response).addListener(ChannelFutureListener.CLOSE);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}

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@ -0,0 +1,79 @@
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.util.CharsetUtil.UTF_8;
import java.util.Random;
/**
* Static and dynamically generated HTML for the example.
*/
public final class Html {
public static final String IP = System.getProperty("ip", "127.0.0.1");
public static final byte[] FOOTER = "</body></html>".getBytes(UTF_8);
public static final byte[] HEADER = ("<!DOCTYPE html><html><head lang=\"en\"><title>Netty HTTP/2 Example</title>"
+ "<style>body {background:#DDD;} div#netty { line-height:0;}</style>"
+ "<link rel=\"shortcut icon\" href=\"about:blank\">"
+ "<meta charset=\"UTF-8\"></head><body>A grid of 200 tiled images is shown below. Compare:"
+ "<p>[<a href='https://" + url(Http2Server.PORT) + "?latency=0'>HTTP/2, 0 latency</a>] [<a href='http://"
+ url(HttpServer.PORT) + "?latency=0'>HTTP/1, 0 latency</a>]<br/>" + "[<a href='https://"
+ url(Http2Server.PORT) + "?latency=30'>HTTP/2, 30ms latency</a>] [<a href='http://" + url(HttpServer.PORT)
+ "?latency=30'>HTTP/1, 30ms latency</a>]<br/>" + "[<a href='https://" + url(Http2Server.PORT)
+ "?latency=200'>HTTP/2, 200ms latency</a>] [<a href='http://" + url(HttpServer.PORT)
+ "?latency=200'>HTTP/1, 200ms latency</a>]<br/>" + "[<a href='https://" + url(Http2Server.PORT)
+ "?latency=1000'>HTTP/2, 1s latency</a>] [<a href='http://" + url(HttpServer.PORT)
+ "?latency=1000'>HTTP/1, " + "1s latency</a>]<br/>").getBytes(UTF_8);
private static final int IMAGES_X_AXIS = 20;
private static final int IMAGES_Y_AXIS = 10;
private Html() {
}
private static String url(int port) {
return IP + ":" + port + "/http2";
}
public static byte[] body(int latency) {
int r = Math.abs(new Random().nextInt());
// The string to be built contains 13192 fixed characters plus the variable latency and random cache-bust.
int numberOfCharacters = 13192 + stringLength(latency) + stringLength(r);
StringBuilder sb = new StringBuilder(numberOfCharacters).append("<div id=\"netty\">");
for (int y = 0; y < IMAGES_Y_AXIS; y++) {
for (int x = 0; x < IMAGES_X_AXIS; x++) {
sb.append("<img width=30 height=29 src='/http2?x=")
.append(x)
.append("&y=").append(y)
.append("&cachebust=").append(r)
.append("&latency=").append(latency)
.append("'>");
}
sb.append("<br/>\r\n");
}
sb.append("</div>");
return sb.toString().getBytes(UTF_8);
}
private static int stringLength(int value) {
return Integer.toString(value).length() * IMAGES_X_AXIS * IMAGES_Y_AXIS;
}
}

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@ -0,0 +1,62 @@
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaderUtil.isKeepAlive;
import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderUtil;
import io.netty.handler.codec.http.HttpHeaderValues;
import java.util.concurrent.TimeUnit;
/**
* Handles the requests for the tiled image using HTTP 1.x as a protocol.
*/
public final class Http1RequestHandler extends Http2RequestHandler {
@Override
protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
if (HttpHeaderUtil.is100ContinueExpected(request)) {
ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
}
super.channelRead0(ctx, request);
}
@Override
protected void sendResponse(final ChannelHandlerContext ctx, String streamId, int latency,
final FullHttpResponse response, final FullHttpRequest request) {
HttpHeaderUtil.setContentLength(response, response.content().readableBytes());
ctx.executor().schedule(new Runnable() {
@Override
public void run() {
if (isKeepAlive(request)) {
response.headers().set(CONNECTION, HttpHeaderValues.KEEP_ALIVE);
ctx.writeAndFlush(response);
} else {
ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
}
}
}, latency, TimeUnit.MILLISECONDS);
}
}

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@ -0,0 +1,77 @@
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http2.DefaultHttp2Connection;
import io.netty.handler.codec.http2.DefaultHttp2FrameReader;
import io.netty.handler.codec.http2.DefaultHttp2FrameWriter;
import io.netty.handler.codec.http2.Http2ConnectionHandler;
import io.netty.handler.codec.http2.Http2OrHttpChooser;
import io.netty.handler.codec.http2.HttpToHttp2ConnectionHandler;
import io.netty.handler.codec.http2.InboundHttp2ToHttpAdapter;
import javax.net.ssl.SSLEngine;
/**
* Used during protocol negotiation, the main function of this handler is to
* return the HTTP/1.1 or HTTP/2 handler once the protocol has been negotiated.
*/
public class Http2OrHttpHandler extends Http2OrHttpChooser {
public Http2OrHttpHandler(int maxHttpContentLength) {
super(maxHttpContentLength);
}
@Override
protected SelectedProtocol getProtocol(SSLEngine engine) {
String[] protocol = engine.getSession().getProtocol().split(":");
if (protocol != null && protocol.length > 1) {
SelectedProtocol selectedProtocol = SelectedProtocol.protocol(protocol[1]);
System.err.println("Selected Protocol is " + selectedProtocol);
return selectedProtocol;
}
return SelectedProtocol.UNKNOWN;
}
@Override
protected void addHttp2Handlers(ChannelHandlerContext ctx) {
DefaultHttp2Connection connection = new DefaultHttp2Connection(true);
DefaultHttp2FrameWriter writer = new DefaultHttp2FrameWriter();
DefaultHttp2FrameReader reader = new DefaultHttp2FrameReader();
InboundHttp2ToHttpAdapter listener = new InboundHttp2ToHttpAdapter.Builder(connection).propagateSettings(true)
.validateHttpHeaders(false).maxContentLength(1024 * 100).build();
ctx.pipeline().addLast("httpToHttp2", new HttpToHttp2ConnectionHandler(connection,
// Loggers can be activated for debugging purposes
// new Http2InboundFrameLogger(reader, TilesHttp2ToHttpHandler.logger),
// new Http2OutboundFrameLogger(writer, TilesHttp2ToHttpHandler.logger)
reader, writer, listener));
ctx.pipeline().addLast("fullHttpRequestHandler", new Http2RequestHandler());
}
@Override
protected ChannelHandler createHttp1RequestHandler() {
return new FallbackRequestHandler();
}
@Override
protected Http2ConnectionHandler createHttp2RequestHandler() {
return null; // NOOP
}
}

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@ -0,0 +1,122 @@
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.buffer.Unpooled.EMPTY_BUFFER;
import static io.netty.example.http2.Http2ExampleUtil.firstValue;
import static io.netty.example.http2.Http2ExampleUtil.toInt;
import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaderUtil.setContentLength;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import static java.lang.Integer.valueOf;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.codec.http2.HttpUtil;
import io.netty.handler.codec.http2.InboundHttp2ToHttpAdapter;
import java.util.concurrent.TimeUnit;
/**
* Handles all the requests for data. It receives a {@link FullHttpRequest},
* which has been converted by a {@link InboundHttp2ToHttpAdapter} before it
* arrived here. For further details, check {@link Http2OrHttpHandler} where the
* pipeline is setup.
*/
public class Http2RequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
private static final String LATENCY_FIELD_NAME = "latency";
private static final int MIN_LATENCY = 0;
private static final int MAX_LATENCY = 1000;
private static final String IMAGE_COORDINATE_Y = "y";
private static final String IMAGE_COORDINATE_X = "x";
@Override
protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
QueryStringDecoder queryString = new QueryStringDecoder(request.uri());
String streamId = streamId(request);
int latency = toInt(firstValue(queryString, LATENCY_FIELD_NAME), 0);
if (latency < MIN_LATENCY || latency > MAX_LATENCY) {
sendBadRequest(ctx, streamId);
return;
}
String x = firstValue(queryString, IMAGE_COORDINATE_X);
String y = firstValue(queryString, IMAGE_COORDINATE_Y);
if (x == null || y == null) {
handlePage(ctx, streamId, latency, request);
} else {
handleImage(x, y, ctx, streamId, latency, request);
}
}
private void sendBadRequest(ChannelHandlerContext ctx, String streamId) {
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST, EMPTY_BUFFER);
streamId(response, streamId);
ctx.writeAndFlush(response);
}
private void handleImage(String x, String y, ChannelHandlerContext ctx, String streamId, int latency,
FullHttpRequest request) {
ByteBuf image = ImageCache.INSTANCE.image(valueOf(x), valueOf(y));
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, image.duplicate());
response.headers().set(CONTENT_TYPE, "image/jpeg");
sendResponse(ctx, streamId, latency, response, request);
}
private void handlePage(ChannelHandlerContext ctx, String streamId, int latency, FullHttpRequest request) {
byte[] body = Html.body(latency);
ByteBuf content = ctx.alloc().buffer(Html.HEADER.length + body.length + Html.FOOTER.length);
content.writeBytes(Html.HEADER);
content.writeBytes(body);
content.writeBytes(Html.FOOTER);
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
sendResponse(ctx, streamId, latency, response, request);
}
protected void sendResponse(final ChannelHandlerContext ctx, String streamId, int latency,
final FullHttpResponse response, final FullHttpRequest request) {
setContentLength(response, response.content().readableBytes());
streamId(response, streamId);
ctx.executor().schedule(new Runnable() {
@Override
public void run() {
ctx.writeAndFlush(response);
}
}, latency, TimeUnit.MILLISECONDS);
}
private String streamId(FullHttpRequest request) {
return request.headers().get(HttpUtil.ExtensionHeaderNames.STREAM_ID.text());
}
private void streamId(FullHttpResponse response, String streamId) {
response.headers().set(HttpUtil.ExtensionHeaderNames.STREAM_ID.text(), streamId);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
}

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/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.handler.codec.http2.Http2OrHttpChooser.SelectedProtocol.HTTP_1_1;
import static io.netty.handler.codec.http2.Http2OrHttpChooser.SelectedProtocol.HTTP_2;
import static io.netty.handler.codec.http2.Http2SecurityUtil.CIPHERS;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.ssl.ApplicationProtocolConfig;
import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.SupportedCipherSuiteFilter;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import java.security.cert.CertificateException;
import javax.net.ssl.SSLException;
/**
* Demonstrates a Http2 server using Netty to display a bunch of images and
* simulate latency. It is a Netty version of the <a href="https://http2.golang.org/gophertiles?latency=0">
* Go lang HTTP2 tiles demo</a>.
*/
public class Http2Server {
public static final int PORT = Integer.parseInt(System.getProperty("http2-port", "8443"));
static final int MAX_CONTENT_LENGTH = 1024 * 100;
private final EventLoopGroup group;
public Http2Server(EventLoopGroup eventLoopGroup) {
group = eventLoopGroup;
}
public ChannelFuture start() throws Exception {
final SslContext sslCtx = configureTLS();
ServerBootstrap b = new ServerBootstrap();
b.option(ChannelOption.SO_BACKLOG, 1024);
b.group(group).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(sslCtx.newHandler(ch.alloc()), new Http2OrHttpHandler(MAX_CONTENT_LENGTH));
}
});
Channel ch = b.bind(PORT).sync().channel();
return ch.closeFuture();
}
private SslContext configureTLS() throws CertificateException, SSLException {
SelfSignedCertificate ssc = new SelfSignedCertificate();
ApplicationProtocolConfig apn = new ApplicationProtocolConfig(Protocol.ALPN,
// NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
SelectorFailureBehavior.NO_ADVERTISE,
// ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
SelectedListenerFailureBehavior.ACCEPT,
HTTP_2.protocolName(), HTTP_1_1.protocolName());
final SslContext sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey(), null)
.ciphers(CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
.applicationProtocolConfig(apn).build();
return sslCtx;
}
}

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/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* Demonstrates a http server using Netty to display a bunch of images, simulate
* latency and compare it against the http2 implementation.
*/
public final class HttpServer {
public static final int PORT = Integer.parseInt(System.getProperty("http-port", "8080"));
private static final int MAX_CONTENT_LENGTH = 1024 * 100;
private final EventLoopGroup group;
public HttpServer(EventLoopGroup eventLoopGroup) {
group = eventLoopGroup;
}
public ChannelFuture start() throws Exception {
ServerBootstrap b = new ServerBootstrap();
b.option(ChannelOption.SO_BACKLOG, 1024);
b.group(group).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast("httpRequestDecoder", new HttpRequestDecoder());
pipeline.addLast("httpResponseEncoder", new HttpResponseEncoder());
pipeline.addLast("httpChunkAggregator", new HttpObjectAggregator(MAX_CONTENT_LENGTH));
pipeline.addLast("httpRequestHandler", new Http1RequestHandler());
}
});
Channel ch = b.bind(PORT).sync().channel();
return ch.closeFuture();
}
}

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/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import static io.netty.buffer.Unpooled.unmodifiableBuffer;
import static io.netty.buffer.Unpooled.unreleasableBuffer;
import static io.netty.example.http2.Http2ExampleUtil.toByteBuf;
import io.netty.buffer.ByteBuf;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Caches the images to avoid reading them every time from the disk.
*/
public final class ImageCache {
public static ImageCache INSTANCE = new ImageCache();
private final Map<String, ByteBuf> imageBank = new HashMap<String, ByteBuf>(200);
private ImageCache() {
init();
}
public static String name(int x, int y) {
return "tile-" + y + "-" + x + ".jpeg";
}
public ByteBuf image(int x, int y) {
return imageBank.get(name(x, y));
}
private void init() {
for (int y = 0; y < 10; y++) {
for (int x = 0; x < 20; x++) {
try {
String name = name(x, y);
ByteBuf fileBytes = unreleasableBuffer(unmodifiableBuffer(toByteBuf(getClass()
.getResourceAsStream(name))));
imageBank.put(name, fileBytes);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

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/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.example.http2.tiles;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
/**
* <p>
* Launches both Http and Http2 servers using Netty to display a set of images
* and simulate latency. It is a Netty version of the <a
* href="https://http2.golang.org/gophertiles?latency=0"> Go lang HTTP2 tiles
* demo</a>.
* </p>
* <p>
* Please note that if you intent to use the JDK provider for SSL, you MUST use JDK 1.8.
* Previous JDK versions don't have any cipher suite that is suitable for use with HTTP/2.
* The associated ALPN library for your JDK version can be found here:
* http://eclipse.org/jetty/documentation/current/alpn-chapter.html#alpn-versions.
* Alternatively, you can use the OpenSsl provider. Please make sure that you run OpenSsl
* version 1.0.2 or greater.
* </p>
*/
public final class Launcher {
public static void main(String[] args) {
EventLoopGroup group = new NioEventLoopGroup();
Http2Server http2 = new Http2Server(group);
HttpServer http = new HttpServer(group);
try {
http2.start();
System.err.println("Open your web browser and navigate to " + "http://" + Html.IP + ":" + HttpServer.PORT);
http.start().sync();
} catch (Exception e) {
e.printStackTrace();
} finally {
group.shutdownGracefully();
}
}
}

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