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Add HttpChunkedInput for easier streaming of chunked content

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Veebs 2014-01-13 15:07:35 -08:00 committed by Norman Maurer
parent 462817cd96
commit 2df690b0e4
2 changed files with 224 additions and 0 deletions
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99
codec-http/src/main/java/io/netty/handler/codec/http/HttpChunkedInput.java Normal file
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/*
* Copyright 2014 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.handler.codec.http;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.stream.ChunkedInput;
/**
* A {@link ChunkedInput} that fetches data chunk by chunk for use with HTTP chunked transfers.
* <p>
* Each chunk from the input data will be wrapped within a {@link HttpContent}. At the end of the input data,
* {@link LastHttpContent} will be written.
* <p>
* Ensure that your HTTP response header contains {@code Transfer-Encoding: chunked}.
* <p>
* <pre>
* public void messageReceived(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
* HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
* response.headers().set(TRANSFER_ENCODING, CHUNKED);
* ctx.write(response);
*
* HttpContentChunkedInput httpChunkWriter = new HttpChunkedInput(
* new ChunkedFile(&quot;/tmp/myfile.txt&quot;));
* ChannelFuture sendFileFuture = ctx.write(httpChunkWriter);
* }
* </pre>
*/
public class HttpChunkedInput implements ChunkedInput<HttpContent> {
private ChunkedInput<ByteBuf> input;
private boolean sentLastChunk;
private LastHttpContent lastHttpContent;
/**
* Creates a new instance using the specified input.
* @param input {@link ChunkedInput} containing data to write
*/
public HttpChunkedInput(ChunkedInput<ByteBuf> input) {
this.input = input;
this.lastHttpContent = LastHttpContent.EMPTY_LAST_CONTENT;
}
/**
* Creates a new instance using the specified input. {@code lastHttpContent} will be written as the terminating
* chunk.
* @param input {@link ChunkedInput} containing data to write
* @param lastHttpContent {@link LastHttpContent} that will be written as the terminating chunk. Use this for
* training headers.
*/
public HttpChunkedInput(ChunkedInput<ByteBuf> input, LastHttpContent lastHttpContent) {
this.input = input;
this.lastHttpContent = lastHttpContent;
}
@Override
public boolean isEndOfInput() throws Exception {
if (input.isEndOfInput()) {
// Only end of input after last HTTP chunk has been sent
return sentLastChunk;
} else {
return false;
}
}
@Override
public void close() throws Exception {
input.close();
}
@Override
public HttpContent readChunk(ChannelHandlerContext ctx) throws Exception {
if (input.isEndOfInput()) {
if (sentLastChunk) {
return null;
} else {
// Send last chunk for this input
sentLastChunk = true;
return lastHttpContent;
}
} else {
ByteBuf buf = input.readChunk(ctx);
return new DefaultHttpContent(buf);
}
}
}

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codec-http/src/test/java/io/netty/handler/codec/http/HttpChunkedInputTest.java Normal file
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/*
* Copyright 2014 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.handler.codec.http;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import io.netty.buffer.ByteBuf;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.handler.stream.ChunkedFile;
import io.netty.handler.stream.ChunkedInput;
import io.netty.handler.stream.ChunkedNioFile;
import io.netty.handler.stream.ChunkedNioStream;
import io.netty.handler.stream.ChunkedStream;
import io.netty.handler.stream.ChunkedWriteHandler;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.Channels;
import org.junit.Test;
public class HttpChunkedInputTest {
private static final byte[] BYTES = new byte[1024 * 64];
private static final File TMP;
static {
for (int i = 0; i < BYTES.length; i++) {
BYTES[i] = (byte) i;
}
FileOutputStream out = null;
try {
TMP = File.createTempFile("netty-chunk-", ".tmp");
TMP.deleteOnExit();
out = new FileOutputStream(TMP);
out.write(BYTES);
out.flush();
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
// ignore
}
}
}
}
@Test
public void testChunkedStream() {
check(new HttpChunkedInput(new ChunkedStream(new ByteArrayInputStream(BYTES))));
}
@Test
public void testChunkedNioStream() {
check(new HttpChunkedInput(new ChunkedNioStream(Channels.newChannel(new ByteArrayInputStream(BYTES)))));
}
@Test
public void testChunkedFile() throws IOException {
check(new HttpChunkedInput(new ChunkedFile(TMP)));
}
@Test
public void testChunkedNioFile() throws IOException {
check(new HttpChunkedInput(new ChunkedNioFile(TMP)));
}
private static void check(ChunkedInput<?>... inputs) {
EmbeddedChannel ch = new EmbeddedChannel(new ChunkedWriteHandler());
for (ChunkedInput<?> input : inputs) {
ch.writeOutbound(input);
}
assertTrue(ch.finish());
int i = 0;
int read = 0;
HttpContent lastHttpContent = null;
for (;;) {
HttpContent httpContent = (HttpContent) ch.readOutbound();
if (httpContent == null) {
break;
} else {
if (lastHttpContent != null) {
assertTrue("Chunk must be DefaultHttpContent", lastHttpContent instanceof DefaultHttpContent);
}
}
ByteBuf buffer = httpContent.content();
while (buffer.isReadable()) {
assertEquals(BYTES[i++], buffer.readByte());
read++;
if (i == BYTES.length) {
i = 0;
}
}
buffer.release();
// Save last chunk
lastHttpContent = httpContent;
}
assertEquals(BYTES.length * inputs.length, read);
assertTrue("Last chunk must be DefaultLastHttpContent", lastHttpContent == LastHttpContent.EMPTY_LAST_CONTENT);
}
}