Add HttpChunkedInput for easier streaming of chunked content
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Veebs
Trustin Lee
parent
78790056c7
commit
4c0be9b57c
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.stream.ChunkedInput;
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/**
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* A {@link ChunkedInput} that fetches data chunk by chunk for use with HTTP chunked transfers.
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* <p>
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* Each chunk from the input data will be wrapped within a {@link HttpContent}. At the end of the input data,
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* {@link LastHttpContent} will be written.
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* <p>
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* Ensure that your HTTP response header contains {@code Transfer-Encoding: chunked}.
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* <p>
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* <pre>
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* public void messageReceived(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
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* HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
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* response.headers().set(TRANSFER_ENCODING, CHUNKED);
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* ctx.write(response);
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*
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* HttpContentChunkedInput httpChunkWriter = new HttpChunkedInput(
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* new ChunkedFile("/tmp/myfile.txt"));
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* ChannelFuture sendFileFuture = ctx.write(httpChunkWriter);
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* }
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* </pre>
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*/
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public class HttpChunkedInput implements ChunkedInput<HttpContent> {
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private ChunkedInput<ByteBuf> input;
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private boolean sentLastChunk;
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private LastHttpContent lastHttpContent;
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/**
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* Creates a new instance using the specified input.
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* @param input {@link ChunkedInput} containing data to write
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*/
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public HttpChunkedInput(ChunkedInput<ByteBuf> input) {
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this.input = input;
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this.lastHttpContent = LastHttpContent.EMPTY_LAST_CONTENT;
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}
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/**
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* Creates a new instance using the specified input. {@code lastHttpContent} will be written as the terminating
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* chunk.
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* @param input {@link ChunkedInput} containing data to write
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* @param lastHttpContent {@link LastHttpContent} that will be written as the terminating chunk. Use this for
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* training headers.
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*/
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public HttpChunkedInput(ChunkedInput<ByteBuf> input, LastHttpContent lastHttpContent) {
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this.input = input;
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this.lastHttpContent = lastHttpContent;
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}
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@Override
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public boolean isEndOfInput() throws Exception {
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if (input.isEndOfInput()) {
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// Only end of input after last HTTP chunk has been sent
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return sentLastChunk;
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} else {
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return false;
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}
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}
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@Override
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public void close() throws Exception {
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input.close();
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}
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@Override
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public HttpContent readChunk(ChannelHandlerContext ctx) throws Exception {
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if (input.isEndOfInput()) {
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if (sentLastChunk) {
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return null;
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} else {
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// Send last chunk for this input
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sentLastChunk = true;
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return lastHttpContent;
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}
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} else {
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ByteBuf buf = input.readChunk(ctx);
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return new DefaultHttpContent(buf);
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}
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}
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}
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@ -0,0 +1,125 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.embedded.EmbeddedChannel;
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import io.netty.handler.stream.ChunkedFile;
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import io.netty.handler.stream.ChunkedInput;
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import io.netty.handler.stream.ChunkedNioFile;
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import io.netty.handler.stream.ChunkedNioStream;
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import io.netty.handler.stream.ChunkedStream;
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import io.netty.handler.stream.ChunkedWriteHandler;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.channels.Channels;
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import org.junit.Test;
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public class HttpChunkedInputTest {
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private static final byte[] BYTES = new byte[1024 * 64];
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private static final File TMP;
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static {
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for (int i = 0; i < BYTES.length; i++) {
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BYTES[i] = (byte) i;
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}
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FileOutputStream out = null;
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try {
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TMP = File.createTempFile("netty-chunk-", ".tmp");
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TMP.deleteOnExit();
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out = new FileOutputStream(TMP);
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out.write(BYTES);
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out.flush();
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} catch (IOException e) {
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throw new RuntimeException(e);
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} finally {
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if (out != null) {
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try {
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out.close();
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} catch (IOException e) {
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// ignore
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}
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}
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}
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}
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@Test
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public void testChunkedStream() {
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check(new HttpChunkedInput(new ChunkedStream(new ByteArrayInputStream(BYTES))));
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}
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@Test
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public void testChunkedNioStream() {
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check(new HttpChunkedInput(new ChunkedNioStream(Channels.newChannel(new ByteArrayInputStream(BYTES)))));
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}
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@Test
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public void testChunkedFile() throws IOException {
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check(new HttpChunkedInput(new ChunkedFile(TMP)));
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}
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@Test
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public void testChunkedNioFile() throws IOException {
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check(new HttpChunkedInput(new ChunkedNioFile(TMP)));
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}
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private static void check(ChunkedInput<?>... inputs) {
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EmbeddedChannel ch = new EmbeddedChannel(new ChunkedWriteHandler());
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for (ChunkedInput<?> input : inputs) {
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ch.writeOutbound(input);
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}
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assertTrue(ch.finish());
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int i = 0;
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int read = 0;
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HttpContent lastHttpContent = null;
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for (;;) {
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HttpContent httpContent = ch.readOutbound();
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if (httpContent == null) {
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break;
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} else {
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if (lastHttpContent != null) {
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assertTrue("Chunk must be DefaultHttpContent", lastHttpContent instanceof DefaultHttpContent);
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}
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}
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ByteBuf buffer = httpContent.content();
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while (buffer.isReadable()) {
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assertEquals(BYTES[i++], buffer.readByte());
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read++;
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if (i == BYTES.length) {
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i = 0;
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}
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}
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buffer.release();
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// Save last chunk
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lastHttpContent = httpContent;
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}
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assertEquals(BYTES.length * inputs.length, read);
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assertTrue("Last chunk must be DefaultLastHttpContent", lastHttpContent == LastHttpContent.EMPTY_LAST_CONTENT);
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}
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}
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