okhttp3.internal.http2.Http2Connection Maven / Gradle / Ivy
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed 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 okhttp3.internal.http2;
import java.io.Closeable;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import okhttp3.Protocol;
import okhttp3.internal.NamedRunnable;
import okhttp3.internal.Util;
import okhttp3.internal.platform.Platform;
import okio.Buffer;
import okio.BufferedSink;
import okio.BufferedSource;
import okio.ByteString;
import okio.Okio;
import static okhttp3.internal.http2.Settings.DEFAULT_INITIAL_WINDOW_SIZE;
import static okhttp3.internal.platform.Platform.INFO;
/**
* A socket connection to a remote peer. A connection hosts streams which can send and receive
* data.
*
* Many methods in this API are synchronous: the call is completed before the
* method returns. This is typical for Java but atypical for HTTP/2. This is motivated by exception
* transparency: an IOException that was triggered by a certain caller can be caught and handled by
* that caller.
*/
public final class Http2Connection implements Closeable {
// Internal state of this connection is guarded by 'this'. No blocking
// operations may be performed while holding this lock!
//
// Socket writes are guarded by frameWriter.
//
// Socket reads are unguarded but are only made by the reader thread.
//
// Certain operations (like SYN_STREAM) need to synchronize on both the
// frameWriter (to do blocking I/O) and this (to create streams). Such
// operations must synchronize on 'this' last. This ensures that we never
// wait for a blocking operation while holding 'this'.
static final ExecutorService executor = new ThreadPoolExecutor(0,
Integer.MAX_VALUE, 60, TimeUnit.SECONDS, new SynchronousQueue(),
Util.threadFactory("OkHttp Http2Connection", true));
/** True if this peer initiated the connection. */
final boolean client;
/**
* User code to run in response to incoming streams or settings. Calls to this are always invoked
* on {@link #executor}.
*/
final Listener listener;
final Map streams = new LinkedHashMap<>();
final String hostname;
int lastGoodStreamId;
int nextStreamId;
boolean shutdown;
/** Ensures push promise callbacks events are sent in order per stream. */
private final ExecutorService pushExecutor;
/** Lazily-created map of in-flight pings awaiting a response. Guarded by this. */
private Map pings;
/** User code to run in response to push promise events. */
final PushObserver pushObserver;
private int nextPingId;
/**
* The total number of bytes consumed by the application, but not yet acknowledged by sending a
* {@code WINDOW_UPDATE} frame on this connection.
*/
// Visible for testing
long unacknowledgedBytesRead = 0;
/**
* Count of bytes that can be written on the connection before receiving a window update.
*/
// Visible for testing
long bytesLeftInWriteWindow;
/** Settings we communicate to the peer. */
Settings okHttpSettings = new Settings();
private static final int OKHTTP_CLIENT_WINDOW_SIZE = 16 * 1024 * 1024;
/** Settings we receive from the peer. */
// TODO: MWS will need to guard on this setting before attempting to push.
final Settings peerSettings = new Settings();
boolean receivedInitialPeerSettings = false;
final Socket socket;
final Http2Writer writer;
// Visible for testing
final ReaderRunnable readerRunnable;
Http2Connection(Builder builder) {
pushObserver = builder.pushObserver;
client = builder.client;
listener = builder.listener;
// http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-5.1.1
nextStreamId = builder.client ? 1 : 2;
if (builder.client) {
nextStreamId += 2; // In HTTP/2, 1 on client is reserved for Upgrade.
}
nextPingId = builder.client ? 1 : 2;
// Flow control was designed more for servers, or proxies than edge clients.
// If we are a client, set the flow control window to 16MiB. This avoids
// thrashing window updates every 64KiB, yet small enough to avoid blowing
// up the heap.
if (builder.client) {
okHttpSettings.set(Settings.INITIAL_WINDOW_SIZE, OKHTTP_CLIENT_WINDOW_SIZE);
}
hostname = builder.hostname;
// Like newSingleThreadExecutor, except lazy creates the thread.
pushExecutor = new ThreadPoolExecutor(0, 1, 60, TimeUnit.SECONDS,
new LinkedBlockingQueue(),
Util.threadFactory(Util.format("OkHttp %s Push Observer", hostname), true));
peerSettings.set(Settings.INITIAL_WINDOW_SIZE, DEFAULT_INITIAL_WINDOW_SIZE);
peerSettings.set(Settings.MAX_FRAME_SIZE, Http2.INITIAL_MAX_FRAME_SIZE);
bytesLeftInWriteWindow = peerSettings.getInitialWindowSize();
socket = builder.socket;
writer = new Http2Writer(builder.sink, client);
readerRunnable = new ReaderRunnable(new Http2Reader(builder.source, client));
}
/** The protocol as selected using ALPN. */
public Protocol getProtocol() {
return Protocol.HTTP_2;
}
/**
* Returns the number of {@link Http2Stream#isOpen() open streams} on this connection.
*/
public synchronized int openStreamCount() {
return streams.size();
}
synchronized Http2Stream getStream(int id) {
return streams.get(id);
}
synchronized Http2Stream removeStream(int streamId) {
Http2Stream stream = streams.remove(streamId);
notifyAll(); // The removed stream may be blocked on a connection-wide window update.
return stream;
}
public synchronized int maxConcurrentStreams() {
return peerSettings.getMaxConcurrentStreams(Integer.MAX_VALUE);
}
/**
* Returns a new server-initiated stream.
*
* @param associatedStreamId the stream that triggered the sender to create this stream.
* @param out true to create an output stream that we can use to send data to the remote peer.
* Corresponds to {@code FLAG_FIN}.
*/
public Http2Stream pushStream(int associatedStreamId, List requestHeaders, boolean out)
throws IOException {
if (client) throw new IllegalStateException("Client cannot push requests.");
return newStream(associatedStreamId, requestHeaders, out);
}
/**
* Returns a new locally-initiated stream.
* @param out true to create an output stream that we can use to send data to the remote peer.
* Corresponds to {@code FLAG_FIN}.
*/
public Http2Stream newStream(List requestHeaders, boolean out) throws IOException {
return newStream(0, requestHeaders, out);
}
private Http2Stream newStream(
int associatedStreamId, List requestHeaders, boolean out) throws IOException {
boolean outFinished = !out;
boolean inFinished = false;
boolean flushHeaders;
Http2Stream stream;
int streamId;
synchronized (writer) {
synchronized (this) {
if (shutdown) {
throw new ConnectionShutdownException();
}
streamId = nextStreamId;
nextStreamId += 2;
stream = new Http2Stream(streamId, this, outFinished, inFinished, requestHeaders);
flushHeaders = !out || bytesLeftInWriteWindow == 0L || stream.bytesLeftInWriteWindow == 0L;
if (stream.isOpen()) {
streams.put(streamId, stream);
}
}
if (associatedStreamId == 0) {
writer.synStream(outFinished, streamId, associatedStreamId, requestHeaders);
} else if (client) {
throw new IllegalArgumentException("client streams shouldn't have associated stream IDs");
} else { // HTTP/2 has a PUSH_PROMISE frame.
writer.pushPromise(associatedStreamId, streamId, requestHeaders);
}
}
if (flushHeaders) {
writer.flush();
}
return stream;
}
void writeSynReply(int streamId, boolean outFinished, List alternating)
throws IOException {
writer.synReply(outFinished, streamId, alternating);
}
/**
* Callers of this method are not thread safe, and sometimes on application threads. Most often,
* this method will be called to send a buffer worth of data to the peer.
*
* Writes are subject to the write window of the stream and the connection. Until there is a
* window sufficient to send {@code byteCount}, the caller will block. For example, a user of
* {@code HttpURLConnection} who flushes more bytes to the output stream than the connection's
* write window will block.
*
*
Zero {@code byteCount} writes are not subject to flow control and will not block. The only
* use case for zero {@code byteCount} is closing a flushed output stream.
*/
public void writeData(int streamId, boolean outFinished, Buffer buffer, long byteCount)
throws IOException {
if (byteCount == 0) { // Empty data frames are not flow-controlled.
writer.data(outFinished, streamId, buffer, 0);
return;
}
while (byteCount > 0) {
int toWrite;
synchronized (Http2Connection.this) {
try {
while (bytesLeftInWriteWindow <= 0) {
// Before blocking, confirm that the stream we're writing is still open. It's possible
// that the stream has since been closed (such as if this write timed out.)
if (!streams.containsKey(streamId)) {
throw new IOException("stream closed");
}
Http2Connection.this.wait(); // Wait until we receive a WINDOW_UPDATE.
}
} catch (InterruptedException e) {
throw new InterruptedIOException();
}
toWrite = (int) Math.min(byteCount, bytesLeftInWriteWindow);
toWrite = Math.min(toWrite, writer.maxDataLength());
bytesLeftInWriteWindow -= toWrite;
}
byteCount -= toWrite;
writer.data(outFinished && byteCount == 0, streamId, buffer, toWrite);
}
}
/**
* {@code delta} will be negative if a settings frame initial window is smaller than the last.
*/
void addBytesToWriteWindow(long delta) {
bytesLeftInWriteWindow += delta;
if (delta > 0) Http2Connection.this.notifyAll();
}
void writeSynResetLater(final int streamId, final ErrorCode errorCode) {
executor.execute(new NamedRunnable("OkHttp %s stream %d", hostname, streamId) {
@Override public void execute() {
try {
writeSynReset(streamId, errorCode);
} catch (IOException ignored) {
}
}
});
}
void writeSynReset(int streamId, ErrorCode statusCode) throws IOException {
writer.rstStream(streamId, statusCode);
}
void writeWindowUpdateLater(final int streamId, final long unacknowledgedBytesRead) {
executor.execute(new NamedRunnable("OkHttp Window Update %s stream %d", hostname, streamId) {
@Override public void execute() {
try {
writer.windowUpdate(streamId, unacknowledgedBytesRead);
} catch (IOException ignored) {
}
}
});
}
/**
* Sends a ping frame to the peer. Use the returned object to await the ping's response and
* observe its round trip time.
*/
public Ping ping() throws IOException {
Ping ping = new Ping();
int pingId;
synchronized (this) {
if (shutdown) {
throw new ConnectionShutdownException();
}
pingId = nextPingId;
nextPingId += 2;
if (pings == null) pings = new LinkedHashMap<>();
pings.put(pingId, ping);
}
writePing(false, pingId, 0x4f4b6f6b /* ASCII "OKok" */, ping);
return ping;
}
void writePingLater(
final boolean reply, final int payload1, final int payload2, final Ping ping) {
executor.execute(new NamedRunnable("OkHttp %s ping %08x%08x",
hostname, payload1, payload2) {
@Override public void execute() {
try {
writePing(reply, payload1, payload2, ping);
} catch (IOException ignored) {
}
}
});
}
void writePing(boolean reply, int payload1, int payload2, Ping ping) throws IOException {
synchronized (writer) {
// Observe the sent time immediately before performing I/O.
if (ping != null) ping.send();
writer.ping(reply, payload1, payload2);
}
}
synchronized Ping removePing(int id) {
return pings != null ? pings.remove(id) : null;
}
public void flush() throws IOException {
writer.flush();
}
/**
* Degrades this connection such that new streams can neither be created locally, nor accepted
* from the remote peer. Existing streams are not impacted. This is intended to permit an endpoint
* to gracefully stop accepting new requests without harming previously established streams.
*/
public void shutdown(ErrorCode statusCode) throws IOException {
synchronized (writer) {
int lastGoodStreamId;
synchronized (this) {
if (shutdown) {
return;
}
shutdown = true;
lastGoodStreamId = this.lastGoodStreamId;
}
// TODO: propagate exception message into debugData.
// TODO: configure a timeout on the reader so that it doesn’t block forever.
writer.goAway(lastGoodStreamId, statusCode, Util.EMPTY_BYTE_ARRAY);
}
}
/**
* Closes this connection. This cancels all open streams and unanswered pings. It closes the
* underlying input and output streams and shuts down internal executor services.
*/
@Override public void close() throws IOException {
close(ErrorCode.NO_ERROR, ErrorCode.CANCEL);
}
void close(ErrorCode connectionCode, ErrorCode streamCode) throws IOException {
assert (!Thread.holdsLock(this));
IOException thrown = null;
try {
shutdown(connectionCode);
} catch (IOException e) {
thrown = e;
}
Http2Stream[] streamsToClose = null;
Ping[] pingsToCancel = null;
synchronized (this) {
if (!streams.isEmpty()) {
streamsToClose = streams.values().toArray(new Http2Stream[streams.size()]);
streams.clear();
}
if (pings != null) {
pingsToCancel = pings.values().toArray(new Ping[pings.size()]);
pings = null;
}
}
if (streamsToClose != null) {
for (Http2Stream stream : streamsToClose) {
try {
stream.close(streamCode);
} catch (IOException e) {
if (thrown != null) thrown = e;
}
}
}
if (pingsToCancel != null) {
for (Ping ping : pingsToCancel) {
ping.cancel();
}
}
// Close the writer to release its resources (such as deflaters).
try {
writer.close();
} catch (IOException e) {
if (thrown == null) thrown = e;
}
// Close the socket to break out the reader thread, which will clean up after itself.
try {
socket.close();
} catch (IOException e) {
thrown = e;
}
if (thrown != null) throw thrown;
}
/**
* Sends any initial frames and starts reading frames from the remote peer. This should be called
* after {@link Builder#build} for all new connections.
*/
public void start() throws IOException {
start(true);
}
/**
* @param sendConnectionPreface true to send connection preface frames. This should always be true
* except for in tests that don't check for a connection preface.
*/
void start(boolean sendConnectionPreface) throws IOException {
if (sendConnectionPreface) {
writer.connectionPreface();
writer.settings(okHttpSettings);
int windowSize = okHttpSettings.getInitialWindowSize();
if (windowSize != Settings.DEFAULT_INITIAL_WINDOW_SIZE) {
writer.windowUpdate(0, windowSize - Settings.DEFAULT_INITIAL_WINDOW_SIZE);
}
}
new Thread(readerRunnable).start(); // Not a daemon thread.
}
/** Merges {@code settings} into this peer's settings and sends them to the remote peer. */
public void setSettings(Settings settings) throws IOException {
synchronized (writer) {
synchronized (this) {
if (shutdown) {
throw new ConnectionShutdownException();
}
okHttpSettings.merge(settings);
writer.settings(settings);
}
}
}
public synchronized boolean isShutdown() {
return shutdown;
}
public static class Builder {
Socket socket;
String hostname;
BufferedSource source;
BufferedSink sink;
Listener listener = Listener.REFUSE_INCOMING_STREAMS;
PushObserver pushObserver = PushObserver.CANCEL;
boolean client;
/**
* @param client true if this peer initiated the connection; false if this peer accepted the
* connection.
*/
public Builder(boolean client) {
this.client = client;
}
public Builder socket(Socket socket) throws IOException {
return socket(socket, ((InetSocketAddress) socket.getRemoteSocketAddress()).getHostName(),
Okio.buffer(Okio.source(socket)), Okio.buffer(Okio.sink(socket)));
}
public Builder socket(
Socket socket, String hostname, BufferedSource source, BufferedSink sink) {
this.socket = socket;
this.hostname = hostname;
this.source = source;
this.sink = sink;
return this;
}
public Builder listener(Listener listener) {
this.listener = listener;
return this;
}
public Builder pushObserver(PushObserver pushObserver) {
this.pushObserver = pushObserver;
return this;
}
public Http2Connection build() {
return new Http2Connection(this);
}
}
/**
* Methods in this class must not lock FrameWriter. If a method needs to write a frame, create an
* async task to do so.
*/
class ReaderRunnable extends NamedRunnable implements Http2Reader.Handler {
final Http2Reader reader;
ReaderRunnable(Http2Reader reader) {
super("OkHttp %s", hostname);
this.reader = reader;
}
@Override protected void execute() {
ErrorCode connectionErrorCode = ErrorCode.INTERNAL_ERROR;
ErrorCode streamErrorCode = ErrorCode.INTERNAL_ERROR;
try {
reader.readConnectionPreface(this);
while (reader.nextFrame(false, this)) {
}
connectionErrorCode = ErrorCode.NO_ERROR;
streamErrorCode = ErrorCode.CANCEL;
} catch (IOException e) {
connectionErrorCode = ErrorCode.PROTOCOL_ERROR;
streamErrorCode = ErrorCode.PROTOCOL_ERROR;
} finally {
try {
close(connectionErrorCode, streamErrorCode);
} catch (IOException ignored) {
}
Util.closeQuietly(reader);
}
}
@Override public void data(boolean inFinished, int streamId, BufferedSource source, int length)
throws IOException {
if (pushedStream(streamId)) {
pushDataLater(streamId, source, length, inFinished);
return;
}
Http2Stream dataStream = getStream(streamId);
if (dataStream == null) {
writeSynResetLater(streamId, ErrorCode.PROTOCOL_ERROR);
source.skip(length);
return;
}
dataStream.receiveData(source, length);
if (inFinished) {
dataStream.receiveFin();
}
}
@Override public void headers(boolean inFinished, int streamId, int associatedStreamId,
List headerBlock) {
if (pushedStream(streamId)) {
pushHeadersLater(streamId, headerBlock, inFinished);
return;
}
Http2Stream stream;
synchronized (Http2Connection.this) {
stream = getStream(streamId);
if (stream == null) {
// If we're shutdown, don't bother with this stream.
if (shutdown) return;
// If the stream ID is less than the last created ID, assume it's already closed.
if (streamId <= lastGoodStreamId) return;
// If the stream ID is in the client's namespace, assume it's already closed.
if (streamId % 2 == nextStreamId % 2) return;
// Create a stream.
final Http2Stream newStream = new Http2Stream(streamId, Http2Connection.this,
false, inFinished, headerBlock);
lastGoodStreamId = streamId;
streams.put(streamId, newStream);
executor.execute(new NamedRunnable("OkHttp %s stream %d", hostname, streamId) {
@Override public void execute() {
try {
listener.onStream(newStream);
} catch (IOException e) {
Platform.get().log(INFO, "Http2Connection.Listener failure for " + hostname, e);
try {
newStream.close(ErrorCode.PROTOCOL_ERROR);
} catch (IOException ignored) {
}
}
}
});
return;
}
}
// Update an existing stream.
stream.receiveHeaders(headerBlock);
if (inFinished) stream.receiveFin();
}
@Override public void rstStream(int streamId, ErrorCode errorCode) {
if (pushedStream(streamId)) {
pushResetLater(streamId, errorCode);
return;
}
Http2Stream rstStream = removeStream(streamId);
if (rstStream != null) {
rstStream.receiveRstStream(errorCode);
}
}
@Override public void settings(boolean clearPrevious, Settings newSettings) {
long delta = 0;
Http2Stream[] streamsToNotify = null;
synchronized (Http2Connection.this) {
int priorWriteWindowSize = peerSettings.getInitialWindowSize();
if (clearPrevious) peerSettings.clear();
peerSettings.merge(newSettings);
applyAndAckSettings(newSettings);
int peerInitialWindowSize = peerSettings.getInitialWindowSize();
if (peerInitialWindowSize != -1 && peerInitialWindowSize != priorWriteWindowSize) {
delta = peerInitialWindowSize - priorWriteWindowSize;
if (!receivedInitialPeerSettings) {
addBytesToWriteWindow(delta);
receivedInitialPeerSettings = true;
}
if (!streams.isEmpty()) {
streamsToNotify = streams.values().toArray(new Http2Stream[streams.size()]);
}
}
executor.execute(new NamedRunnable("OkHttp %s settings", hostname) {
@Override public void execute() {
listener.onSettings(Http2Connection.this);
}
});
}
if (streamsToNotify != null && delta != 0) {
for (Http2Stream stream : streamsToNotify) {
synchronized (stream) {
stream.addBytesToWriteWindow(delta);
}
}
}
}
private void applyAndAckSettings(final Settings peerSettings) {
executor.execute(new NamedRunnable("OkHttp %s ACK Settings", hostname) {
@Override public void execute() {
try {
writer.applyAndAckSettings(peerSettings);
} catch (IOException ignored) {
}
}
});
}
@Override public void ackSettings() {
// TODO: If we don't get this callback after sending settings to the peer, SETTINGS_TIMEOUT.
}
@Override public void ping(boolean reply, int payload1, int payload2) {
if (reply) {
Ping ping = removePing(payload1);
if (ping != null) {
ping.receive();
}
} else {
// Send a reply to a client ping if this is a server and vice versa.
writePingLater(true, payload1, payload2, null);
}
}
@Override public void goAway(int lastGoodStreamId, ErrorCode errorCode, ByteString debugData) {
if (debugData.size() > 0) { // TODO: log the debugData
}
// Copy the streams first. We don't want to hold a lock when we call receiveRstStream().
Http2Stream[] streamsCopy;
synchronized (Http2Connection.this) {
streamsCopy = streams.values().toArray(new Http2Stream[streams.size()]);
shutdown = true;
}
// Fail all streams created after the last good stream ID.
for (Http2Stream http2Stream : streamsCopy) {
if (http2Stream.getId() > lastGoodStreamId && http2Stream.isLocallyInitiated()) {
http2Stream.receiveRstStream(ErrorCode.REFUSED_STREAM);
removeStream(http2Stream.getId());
}
}
}
@Override public void windowUpdate(int streamId, long windowSizeIncrement) {
if (streamId == 0) {
synchronized (Http2Connection.this) {
bytesLeftInWriteWindow += windowSizeIncrement;
Http2Connection.this.notifyAll();
}
} else {
Http2Stream stream = getStream(streamId);
if (stream != null) {
synchronized (stream) {
stream.addBytesToWriteWindow(windowSizeIncrement);
}
}
}
}
@Override public void priority(int streamId, int streamDependency, int weight,
boolean exclusive) {
// TODO: honor priority.
}
@Override
public void pushPromise(int streamId, int promisedStreamId, List requestHeaders) {
pushRequestLater(promisedStreamId, requestHeaders);
}
@Override public void alternateService(int streamId, String origin, ByteString protocol,
String host, int port, long maxAge) {
// TODO: register alternate service.
}
}
/** Even, positive numbered streams are pushed streams in HTTP/2. */
boolean pushedStream(int streamId) {
return streamId != 0 && (streamId & 1) == 0;
}
// Guarded by this.
final Set currentPushRequests = new LinkedHashSet<>();
void pushRequestLater(final int streamId, final List requestHeaders) {
synchronized (this) {
if (currentPushRequests.contains(streamId)) {
writeSynResetLater(streamId, ErrorCode.PROTOCOL_ERROR);
return;
}
currentPushRequests.add(streamId);
}
pushExecutor.execute(new NamedRunnable("OkHttp %s Push Request[%s]", hostname, streamId) {
@Override public void execute() {
boolean cancel = pushObserver.onRequest(streamId, requestHeaders);
try {
if (cancel) {
writer.rstStream(streamId, ErrorCode.CANCEL);
synchronized (Http2Connection.this) {
currentPushRequests.remove(streamId);
}
}
} catch (IOException ignored) {
}
}
});
}
void pushHeadersLater(final int streamId, final List requestHeaders,
final boolean inFinished) {
pushExecutor.execute(new NamedRunnable("OkHttp %s Push Headers[%s]", hostname, streamId) {
@Override public void execute() {
boolean cancel = pushObserver.onHeaders(streamId, requestHeaders, inFinished);
try {
if (cancel) writer.rstStream(streamId, ErrorCode.CANCEL);
if (cancel || inFinished) {
synchronized (Http2Connection.this) {
currentPushRequests.remove(streamId);
}
}
} catch (IOException ignored) {
}
}
});
}
/**
* Eagerly reads {@code byteCount} bytes from the source before launching a background task to
* process the data. This avoids corrupting the stream.
*/
void pushDataLater(final int streamId, final BufferedSource source, final int byteCount,
final boolean inFinished) throws IOException {
final Buffer buffer = new Buffer();
source.require(byteCount); // Eagerly read the frame before firing client thread.
source.read(buffer, byteCount);
if (buffer.size() != byteCount) throw new IOException(buffer.size() + " != " + byteCount);
pushExecutor.execute(new NamedRunnable("OkHttp %s Push Data[%s]", hostname, streamId) {
@Override public void execute() {
try {
boolean cancel = pushObserver.onData(streamId, buffer, byteCount, inFinished);
if (cancel) writer.rstStream(streamId, ErrorCode.CANCEL);
if (cancel || inFinished) {
synchronized (Http2Connection.this) {
currentPushRequests.remove(streamId);
}
}
} catch (IOException ignored) {
}
}
});
}
void pushResetLater(final int streamId, final ErrorCode errorCode) {
pushExecutor.execute(new NamedRunnable("OkHttp %s Push Reset[%s]", hostname, streamId) {
@Override public void execute() {
pushObserver.onReset(streamId, errorCode);
synchronized (Http2Connection.this) {
currentPushRequests.remove(streamId);
}
}
});
}
/** Listener of streams and settings initiated by the peer. */
public abstract static class Listener {
public static final Listener REFUSE_INCOMING_STREAMS = new Listener() {
@Override public void onStream(Http2Stream stream) throws IOException {
stream.close(ErrorCode.REFUSED_STREAM);
}
};
/**
* Handle a new stream from this connection's peer. Implementations should respond by either
* {@linkplain Http2Stream#sendResponseHeaders replying to the stream} or {@linkplain
* Http2Stream#close closing it}. This response does not need to be synchronous.
*/
public abstract void onStream(Http2Stream stream) throws IOException;
/**
* Notification that the connection's peer's settings may have changed. Implementations should
* take appropriate action to handle the updated settings.
*
* It is the implementation's responsibility to handle concurrent calls to this method. A
* remote peer that sends multiple settings frames will trigger multiple calls to this method,
* and those calls are not necessarily serialized.
*/
public void onSettings(Http2Connection connection) {
}
}
}