/**
* Eagerly reads {@code byteCount} bytes from the source before launching a background task to
* process the data. This avoids corrupting the stream.
*/
private 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) frameWriter.rstStream(streamId, ErrorCode.CANCEL);
if (cancel || inFinished) {
synchronized (FramedConnection.this) {
currentPushRequests.remove(streamId);
}
}
} catch (IOException ignored) {
}
}
});
}
@Override
public boolean nextFrame(Handler handler) throws IOException {
try {
source.require(9); // Frame header size
} catch (IOException e) {
return false; // This might be a normal socket close.
}
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Length (24) |
* +---------------+---------------+---------------+
* | Type (8) | Flags (8) |
* +-+-+-----------+---------------+-------------------------------+
* |R| Stream Identifier (31) |
* +=+=============================================================+
* | Frame Payload (0...) ...
* +---------------------------------------------------------------+
*/
int length = readMedium(source);
if (length < 0 || length > INITIAL_MAX_FRAME_SIZE) {
throw ioException("FRAME_SIZE_ERROR: %s", length);
}
byte type = (byte) (source.readByte() & 0xff);
byte flags = (byte) (source.readByte() & 0xff);
int streamId = (source.readInt() & 0x7fffffff); // Ignore reserved bit.
if (logger.isLoggable(FINE)) logger.fine(formatHeader(true, streamId, length, type, flags));
switch (type) {
case TYPE_DATA:
readData(handler, length, flags, streamId);
break;
case TYPE_HEADERS:
readHeaders(handler, length, flags, streamId);
break;
case TYPE_PRIORITY:
readPriority(handler, length, flags, streamId);
break;
case TYPE_RST_STREAM:
readRstStream(handler, length, flags, streamId);
break;
case TYPE_SETTINGS:
readSettings(handler, length, flags, streamId);
break;
case TYPE_PUSH_PROMISE:
readPushPromise(handler, length, flags, streamId);
break;
case TYPE_PING:
readPing(handler, length, flags, streamId);
break;
case TYPE_GOAWAY:
readGoAway(handler, length, flags, streamId);
break;
case TYPE_WINDOW_UPDATE:
readWindowUpdate(handler, length, flags, streamId);
break;
default:
// Implementations MUST discard frames that have unknown or unsupported types.
source.skip(length);
}
return true;
}