SPDY: fix support for pushed resources in SpdyHttpEncoder
Motivation: The SpdyHttpDecoder was modified to support pushed resources that are divided into multiple frames. The decoder accepts a pushed SpdySynStreamFrame containing the request headers, followed by a SpdyHeadersFrame containing the response headers. Modifications: This commit modifies the SpdyHttpEncoder so that it encodes pushed resources in a format that the SpdyHttpDecoder can decode. The encoder will accept an HttpRequest object containing the request headers, followed by an HttpResponse object containing the response headers. Result: The SpdyHttpEncoder will create a SpdySynStreamFrame followed by a SpdyHeadersFrame when sending pushed resources.
This commit is contained in:
Jeff Pinner
Trustin Lee
parent
c4630c0328
commit
04dd885421
@ -19,7 +19,6 @@ import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToMessageEncoder;
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import io.netty.handler.codec.UnsupportedMessageTypeException;
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import io.netty.handler.codec.http.FullHttpMessage;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.HttpContent;
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import io.netty.handler.codec.http.HttpHeaderNames;
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import io.netty.handler.codec.http.HttpHeaders;
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@ -75,7 +74,7 @@ import static io.netty.handler.codec.spdy.SpdyHeaders.HttpNames.*;
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*
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* <h3>Pushed Resource Annotations</h3>
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*
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* SPDY specific headers must be added to pushed {@link HttpResponse}s:
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* SPDY specific headers must be added to pushed {@link HttpRequest}s:
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* <table border=1>
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* <tr>
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* <th>Header Name</th><th>Header Value</th>
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@ -96,10 +95,6 @@ import static io.netty.handler.codec.spdy.SpdyHeaders.HttpNames.*;
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* 0 represents the highest priority and 7 represents the lowest.
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* This header is optional and defaults to 0.</td>
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* </tr>
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* <tr>
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* <td>{@code "X-SPDY-URL"}</td>
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* <td>The absolute path for the resource being pushed.</td>
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* </tr>
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* </table>
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*
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* <h3>Required Annotations</h3>
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@ -126,7 +121,6 @@ import static io.netty.handler.codec.spdy.SpdyHeaders.HttpNames.*;
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*/
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public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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private final int spdyVersion;
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private int currentStreamId;
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/**
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@ -138,7 +132,6 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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if (version == null) {
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throw new NullPointerException("version");
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}
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spdyVersion = version.getVersion();
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}
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@Override
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@ -153,22 +146,16 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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SpdySynStreamFrame spdySynStreamFrame = createSynStreamFrame(httpRequest);
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out.add(spdySynStreamFrame);
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last = spdySynStreamFrame.isLast();
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last = spdySynStreamFrame.isLast() || spdySynStreamFrame.isUnidirectional();
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valid = true;
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}
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if (msg instanceof HttpResponse) {
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HttpResponse httpResponse = (HttpResponse) msg;
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if (httpResponse.headers().contains(SpdyHttpHeaders.Names.ASSOCIATED_TO_STREAM_ID)) {
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SpdySynStreamFrame spdySynStreamFrame = createSynStreamFrame(httpResponse);
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last = spdySynStreamFrame.isLast();
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out.add(spdySynStreamFrame);
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} else {
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SpdySynReplyFrame spdySynReplyFrame = createSynReplyFrame(httpResponse);
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last = spdySynReplyFrame.isLast();
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out.add(spdySynReplyFrame);
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}
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SpdyHeadersFrame spdyHeadersFrame = createHeadersFrame(httpResponse);
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out.add(spdyHeadersFrame);
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last = spdyHeadersFrame.isLast();
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valid = true;
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}
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if (msg instanceof HttpContent && !last) {
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@ -177,22 +164,23 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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chunk.content().retain();
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SpdyDataFrame spdyDataFrame = new DefaultSpdyDataFrame(currentStreamId, chunk.content());
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spdyDataFrame.setLast(chunk instanceof LastHttpContent);
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if (chunk instanceof LastHttpContent) {
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LastHttpContent trailer = (LastHttpContent) chunk;
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HttpHeaders trailers = trailer.trailingHeaders();
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if (trailers.isEmpty()) {
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spdyDataFrame.setLast(true);
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out.add(spdyDataFrame);
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} else {
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// Create SPDY HEADERS frame out of trailers
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SpdyHeadersFrame spdyHeadersFrame = new DefaultSpdyHeadersFrame(currentStreamId);
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spdyHeadersFrame.setLast(true);
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for (Map.Entry<String, String> entry: trailers) {
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spdyHeadersFrame.headers().add(entry.getKey(), entry.getValue());
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}
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// Write HEADERS frame and append Data Frame
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out.add(spdyHeadersFrame);
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// Write DATA frame and append HEADERS frame
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out.add(spdyDataFrame);
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out.add(spdyHeadersFrame);
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}
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} else {
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out.add(spdyDataFrame);
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@ -206,19 +194,17 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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}
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}
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private SpdySynStreamFrame createSynStreamFrame(HttpMessage httpMessage)
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throws Exception {
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// Get the Stream-ID, Associated-To-Stream-ID, Priority, URL, and scheme from the headers
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final HttpHeaders httpHeaders = httpMessage.headers();
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int streamID = httpMessage.headers().getInt(Names.STREAM_ID);
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int associatedToStreamId = httpMessage.headers().getInt(Names.ASSOCIATED_TO_STREAM_ID, 0);
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byte priority = (byte) httpMessage.headers().getInt(Names.PRIORITY, 0);
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String URL = httpHeaders.get(Names.URL);
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String scheme = httpHeaders.get(Names.SCHEME);
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@SuppressWarnings("deprecation")
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private SpdySynStreamFrame createSynStreamFrame(HttpRequest httpRequest) throws Exception {
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// Get the Stream-ID, Associated-To-Stream-ID, Priority, and scheme from the headers
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final HttpHeaders httpHeaders = httpRequest.headers();
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int streamId = httpHeaders.getInt(Names.STREAM_ID);
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int associatedToStreamId = httpHeaders.getInt(Names.ASSOCIATED_TO_STREAM_ID, 0);
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byte priority = (byte) httpHeaders.getInt(Names.PRIORITY, 0);
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CharSequence scheme = httpHeaders.get(Names.SCHEME);
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httpHeaders.remove(Names.STREAM_ID);
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httpHeaders.remove(Names.ASSOCIATED_TO_STREAM_ID);
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httpHeaders.remove(Names.PRIORITY);
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httpHeaders.remove(Names.URL);
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httpHeaders.remove(Names.SCHEME);
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// The Connection, Keep-Alive, Proxy-Connection, and Transfer-Encoding
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@ -229,30 +215,18 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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httpHeaders.remove(HttpHeaderNames.TRANSFER_ENCODING);
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SpdySynStreamFrame spdySynStreamFrame =
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new DefaultSpdySynStreamFrame(streamID, associatedToStreamId, priority);
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new DefaultSpdySynStreamFrame(streamId, associatedToStreamId, priority);
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// Unfold the first line of the message into name/value pairs
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SpdyHeaders frameHeaders = spdySynStreamFrame.headers();
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if (httpMessage instanceof FullHttpRequest) {
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HttpRequest httpRequest = (HttpRequest) httpMessage;
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frameHeaders.setObject(METHOD, httpRequest.method());
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frameHeaders.set(PATH, httpRequest.uri());
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frameHeaders.setObject(VERSION, httpMessage.protocolVersion());
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}
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if (httpMessage instanceof HttpResponse) {
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HttpResponse httpResponse = (HttpResponse) httpMessage;
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frameHeaders.setInt(STATUS, httpResponse.status().code());
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frameHeaders.set(PATH, URL);
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frameHeaders.setObject(VERSION, httpMessage.protocolVersion());
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spdySynStreamFrame.setUnidirectional(true);
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}
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frameHeaders.setObject(VERSION, httpRequest.protocolVersion());
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// Replace the HTTP host header with the SPDY host header
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if (spdyVersion >= 3) {
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String host = httpMessage.headers().get(HttpHeaderNames.HOST);
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CharSequence host = httpHeaders.get(HttpHeaderNames.HOST);
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httpHeaders.remove(HttpHeaderNames.HOST);
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frameHeaders.set(HOST, host);
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}
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// Set the SPDY scheme header
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if (scheme == null) {
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@ -265,16 +239,20 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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frameHeaders.add(entry.getKey(), entry.getValue());
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}
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currentStreamId = spdySynStreamFrame.streamId();
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spdySynStreamFrame.setLast(isLast(httpMessage));
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if (associatedToStreamId == 0) {
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spdySynStreamFrame.setLast(isLast(httpRequest));
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} else {
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spdySynStreamFrame.setUnidirectional(true);
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}
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return spdySynStreamFrame;
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}
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private SpdySynReplyFrame createSynReplyFrame(HttpResponse httpResponse)
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throws Exception {
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@SuppressWarnings("deprecation")
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private SpdyHeadersFrame createHeadersFrame(HttpResponse httpResponse) throws Exception {
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// Get the Stream-ID from the headers
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final HttpHeaders httpHeaders = httpResponse.headers();
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int streamID = httpResponse.headers().getInt(Names.STREAM_ID);
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int streamId = httpHeaders.getInt(Names.STREAM_ID);
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httpHeaders.remove(Names.STREAM_ID);
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// The Connection, Keep-Alive, Proxy-Connection, and Transfer-Encoding
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@ -284,21 +262,26 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<HttpObject> {
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httpHeaders.remove("Proxy-Connection");
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httpHeaders.remove(HttpHeaderNames.TRANSFER_ENCODING);
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SpdySynReplyFrame spdySynReplyFrame = new DefaultSpdySynReplyFrame(streamID);
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SpdyHeaders frameHeaders = spdySynReplyFrame.headers();
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SpdyHeadersFrame spdyHeadersFrame;
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if (SpdyCodecUtil.isServerId(streamId)) {
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spdyHeadersFrame = new DefaultSpdyHeadersFrame(streamId);
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} else {
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spdyHeadersFrame = new DefaultSpdySynReplyFrame(streamId);
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}
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SpdyHeaders frameHeaders = spdyHeadersFrame.headers();
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// Unfold the first line of the response into name/value pairs
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frameHeaders.setInt(STATUS, httpResponse.status().code());
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frameHeaders.setObject(VERSION, httpResponse.protocolVersion());
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// Transfer the remaining HTTP headers
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for (Map.Entry<String, String> entry: httpHeaders) {
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spdySynReplyFrame.headers().add(entry.getKey(), entry.getValue());
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spdyHeadersFrame.headers().add(entry.getKey(), entry.getValue());
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}
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currentStreamId = streamID;
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spdySynReplyFrame.setLast(isLast(httpResponse));
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currentStreamId = streamId;
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spdyHeadersFrame.setLast(isLast(httpResponse));
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return spdySynReplyFrame;
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return spdyHeadersFrame;
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}
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/**
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@ -39,10 +39,6 @@ public final class SpdyHttpHeaders {
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* {@code "X-SPDY-Priority"}
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*/
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public static final AsciiString PRIORITY = new AsciiString("X-SPDY-Priority");
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/**
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* {@code "X-SPDY-URL"}
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*/
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public static final AsciiString URL = new AsciiString("X-SPDY-URL");
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/**
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* {@code "X-SPDY-Scheme"}
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*/
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