/**
* 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.
*
* <p>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.
*
* <p>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.
frameWriter.data(outFinished, streamId, buffer, 0);
return;
}
while (byteCount > 0) {
int toWrite;
synchronized (FramedConnection.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");
}
FramedConnection.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, frameWriter.maxDataLength());
bytesLeftInWriteWindow -= toWrite;
}
byteCount -= toWrite;
frameWriter.data(outFinished && byteCount == 0, streamId, buffer, toWrite);
}
}
/**
* 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.
*
* <p>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.
*
* <p>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, OkBuffer buffer, long byteCount)
throws IOException {
if (byteCount == 0) { // Empty data frames are not flow-controlled.
frameWriter.data(outFinished, streamId, buffer, 0);
return;
}
while (byteCount > 0) {
int toWrite;
synchronized (SpdyConnection.this) {
try {
while (bytesLeftInWriteWindow <= 0) {
SpdyConnection.this.wait(); // Wait until we receive a WINDOW_UPDATE.
}
} catch (InterruptedException e) {
throw new InterruptedIOException();
}
toWrite = (int) Math.min(Math.min(byteCount, bytesLeftInWriteWindow), maxFrameSize);
bytesLeftInWriteWindow -= toWrite;
}
byteCount -= toWrite;
frameWriter.data(outFinished && byteCount == 0, streamId, buffer, toWrite);
}
}
/**
* @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) {
frameWriter.connectionPreface();
frameWriter.settings(okHttpSettings);
int windowSize = okHttpSettings.getInitialWindowSize(Settings.DEFAULT_INITIAL_WINDOW_SIZE);
if (windowSize != Settings.DEFAULT_INITIAL_WINDOW_SIZE) {
frameWriter.windowUpdate(0, windowSize - Settings.DEFAULT_INITIAL_WINDOW_SIZE);
}
}
new Thread(readerRunnable).start(); // Not a daemon thread.
}
private void writePing(boolean reply, int payload1, int payload2, Ping ping) throws IOException {
synchronized (frameWriter) {
// Observe the sent time immediately before performing I/O.
if (ping != null) ping.send();
frameWriter.ping(reply, payload1, payload2);
}
}
/**
* Called to perform a window update for this stream (or connection). Updates the window size
* back to the size of the initial window and sends a window update frame to the remote
* endpoint.
*/
void updateWindow(FrameWriter frameWriter) throws Http2Exception {
// Expand the window for this stream back to the size of the initial window.
int deltaWindowSize = initialWindowSize - windowSize();
addAndGet(deltaWindowSize);
// Send a window update for the stream/connection.
frameWriter.writeFrame(streamId, deltaWindowSize);
}
private void close(ErrorCode connectionCode, ErrorCode streamCode) throws IOException {
assert (!Thread.holdsLock(this));
IOException thrown = null;
try {
shutdown(connectionCode);
} catch (IOException e) {
thrown = e;
}
FramedStream[] streamsToClose = null;
Ping[] pingsToCancel = null;
synchronized (this) {
if (!streams.isEmpty()) {
streamsToClose = streams.values().toArray(new FramedStream[streams.size()]);
streams.clear();
setIdle(false);
}
if (pings != null) {
pingsToCancel = pings.values().toArray(new Ping[pings.size()]);
pings = null;
}
}
if (streamsToClose != null) {
for (FramedStream 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 {
frameWriter.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;
}
/** Merges {@code settings} into this peer's settings and sends them to the remote peer. */
public void setSettings(Settings settings) throws IOException {
synchronized (frameWriter) {
synchronized (this) {
if (shutdown) {
throw new IOException("shutdown");
}
okHttpSettings.merge(settings);
frameWriter.settings(settings);
}
}
}
private void close(ErrorCode connectionCode, ErrorCode streamCode) throws IOException {
assert (!Thread.holdsLock(this));
IOException thrown = null;
try {
shutdown(connectionCode);
} catch (IOException e) {
thrown = e;
}
SpdyStream[] streamsToClose = null;
Ping[] pingsToCancel = null;
synchronized (this) {
if (!streams.isEmpty()) {
streamsToClose = streams.values().toArray(new SpdyStream[streams.size()]);
streams.clear();
setIdle(false);
}
if (pings != null) {
pingsToCancel = pings.values().toArray(new Ping[pings.size()]);
pings = null;
}
}
if (streamsToClose != null) {
for (SpdyStream stream : streamsToClose) {
try {
stream.close(streamCode);
} catch (IOException e) {
if (thrown != null) thrown = e;
}
}
}
if (pingsToCancel != null) {
for (Ping ping : pingsToCancel) {
ping.cancel();
}
}
try {
frameReader.close();
} catch (IOException e) {
thrown = e;
}
try {
frameWriter.close();
} catch (IOException e) {
if (thrown == null) thrown = e;
}
if (thrown != null) throw thrown;
}
private SpdyStream newStream(
int associatedStreamId, List<Header> requestHeaders, boolean out, boolean in)
throws IOException {
boolean outFinished = !out;
boolean inFinished = !in;
int priority = -1; // TODO: permit the caller to specify a priority?
int slot = 0; // TODO: permit the caller to specify a slot?
SpdyStream stream;
int streamId;
synchronized (frameWriter) {
synchronized (this) {
if (shutdown) {
throw new IOException("shutdown");
}
streamId = nextStreamId;
nextStreamId += 2;
stream = new SpdyStream(streamId, this, outFinished, inFinished, priority, requestHeaders);
if (stream.isOpen()) {
streams.put(streamId, stream);
setIdle(false);
}
}
if (associatedStreamId == 0) {
frameWriter.synStream(
outFinished, inFinished, streamId, associatedStreamId, priority, slot, requestHeaders);
} else if (client) {
throw new IllegalArgumentException("client streams shouldn't have associated stream IDs");
} else { // HTTP/2 has a PUSH_PROMISE frame.
frameWriter.pushPromise(associatedStreamId, streamId, requestHeaders);
}
}
if (!out) {
frameWriter.flush();
}
return stream;
}
/**
* Called to perform a window update for this stream (or connection). Updates the window size
* back to the size of the initial window and sends a window update frame to the remote
* endpoint.
*/
public void updateWindow(FrameWriter frameWriter) throws Http2Exception {
// Expand the window for this stream back to the size of the initial window.
int deltaWindowSize = initialWindowSize - getSize();
addAndGet(deltaWindowSize);
// Send a window update for the stream/connection.
Http2WindowUpdateFrame updateFrame =
new DefaultHttp2WindowUpdateFrame.Builder()
.setStreamId(streamId)
.setWindowSizeIncrement(deltaWindowSize)
.build();
frameWriter.writeFrame(updateFrame);
}
/**
* 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 (frameWriter) {
int lastGoodStreamId;
synchronized (this) {
if (shutdown) {
return;
}
shutdown = true;
lastGoodStreamId = this.lastGoodStreamId;
}
// TODO: propagate exception message into debugData
frameWriter.goAway(lastGoodStreamId, statusCode, Util.EMPTY_BYTE_ARRAY);
}
}
/**
* Sends a connection header if the current variant requires it. This should be called after
* {@link Builder#build} for all new connections.
*/
public void sendConnectionHeader() throws IOException {
frameWriter.connectionHeader();
frameWriter.settings(okHttpSettings);
}
public void flush() throws IOException {
frameWriter.flush();
}
void writeSynReset(int streamId, ErrorCode statusCode) throws IOException {
frameWriter.rstStream(streamId, statusCode);
}
void writeSynReply(int streamId, boolean outFinished, List<Header> alternating)
throws IOException {
frameWriter.synReply(outFinished, streamId, alternating);
}