private void readPushPromiseFrame(
final ChannelHandlerContext ctx, ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
final int pushPromiseStreamId = streamId;
int padding = flags.readPaddingLength(payload);
final int promisedStreamId = readUnsignedInt(payload);
// Create a handler that invokes the observer when the header block is complete.
headersContinuation =
new HeadersContinuation() {
@Override
public int getStreamId() {
return pushPromiseStreamId;
}
@Override
public void processFragment(
boolean endOfHeaders, ByteBuf fragment, int padding, Http2FrameObserver observer)
throws Http2Exception {
builder().addFragment(fragment, ctx.alloc(), endOfHeaders);
if (endOfHeaders) {
Http2Headers headers = builder().buildHeaders();
observer.onPushPromiseRead(
ctx, pushPromiseStreamId, promisedStreamId, headers, padding);
close();
}
}
};
// Process the initial fragment, invoking the observer's callback if end of headers.
final ByteBuf fragment = payload.readSlice(payload.readableBytes() - padding);
headersContinuation.processFragment(flags.endOfHeaders(), fragment, padding, observer);
}
private void readContinuationFrame(ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
int padding = flags.readPaddingLength(payload);
// Process the initial fragment, invoking the observer's callback if end of headers.
final ByteBuf continuationFragment = payload.readSlice(payload.readableBytes() - padding);
headersContinuation.processFragment(
flags.endOfHeaders(), continuationFragment, padding, observer);
}
private void verifyContinuationFrame() throws Http2Exception {
verifyPayloadLength(payloadLength);
if (headersContinuation == null) {
throw protocolError("Received %s frame but not currently processing headers.", frameType);
}
if (streamId != headersContinuation.getStreamId()) {
throw protocolError(
"Continuation stream ID does not match pending headers. "
+ "Expected %d, but received %d.",
headersContinuation.getStreamId(), streamId);
}
if (!flags.isPaddingLengthValid()) {
throw protocolError("Pad high is set but pad low is not");
}
if (payloadLength < flags.getNumPaddingLengthBytes()) {
throw protocolError("Frame length %d too small for padding.", payloadLength);
}
}
@Override
public void close() {
if (headersContinuation != null) {
headersContinuation.close();
}
}
private void readHeadersFrame(
final ChannelHandlerContext ctx, ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
final int headersStreamId = streamId;
final Http2Flags headersFlags = flags;
int padding = flags.readPaddingLength(payload);
// The callback that is invoked is different depending on whether priority information
// is present in the headers frame.
if (flags.priorityPresent()) {
long word1 = payload.readUnsignedInt();
final boolean exclusive = (word1 & 0x80000000L) > 0;
final int streamDependency = (int) (word1 & 0x7FFFFFFFL);
final short weight = (short) (payload.readUnsignedByte() + 1);
final ByteBuf fragment = payload.readSlice(payload.readableBytes() - padding);
// Create a handler that invokes the observer when the header block is complete.
headersContinuation =
new HeadersContinuation() {
@Override
public int getStreamId() {
return headersStreamId;
}
@Override
public void processFragment(
boolean endOfHeaders, ByteBuf fragment, int padding, Http2FrameObserver observer)
throws Http2Exception {
builder().addFragment(fragment, ctx.alloc(), endOfHeaders);
if (endOfHeaders) {
Http2Headers headers = builder().buildHeaders();
observer.onHeadersRead(
ctx,
headersStreamId,
headers,
streamDependency,
weight,
exclusive,
padding,
headersFlags.endOfStream(),
headersFlags.endOfSegment());
close();
}
}
};
// Process the initial fragment, invoking the observer's callback if end of headers.
headersContinuation.processFragment(flags.endOfHeaders(), fragment, padding, observer);
return;
}
// The priority fields are not present in the frame. Prepare a continuation that invokes
// the observer callback without priority information.
headersContinuation =
new HeadersContinuation() {
@Override
public int getStreamId() {
return headersStreamId;
}
@Override
public void processFragment(
boolean endOfHeaders, ByteBuf fragment, int padding, Http2FrameObserver observer)
throws Http2Exception {
builder().addFragment(fragment, ctx.alloc(), endOfHeaders);
if (endOfHeaders) {
Http2Headers headers = builder().buildHeaders();
observer.onHeadersRead(
ctx,
headersStreamId,
headers,
padding,
headersFlags.endOfStream(),
headersFlags.endOfSegment());
close();
}
}
};
// Process the initial fragment, invoking the observer's callback if end of headers.
final ByteBuf fragment = payload.readSlice(payload.readableBytes() - padding);
headersContinuation.processFragment(flags.endOfHeaders(), fragment, padding, observer);
}
