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 verifyDataFrame() throws Http2Exception {
verifyNotProcessingHeaders();
verifyPayloadLength(payloadLength);
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.", payloadLength);
}
}
private void verifyPushPromiseFrame() throws Http2Exception {
verifyNotProcessingHeaders();
verifyPayloadLength(payloadLength);
if (!flags.isPaddingLengthValid()) {
throw protocolError("Pad high is set but pad low is not");
}
// Subtract the length of the promised stream ID field, to determine the length of the
// rest of the payload (header block fragment + payload).
int lengthWithoutPromisedId = payloadLength - INT_FIELD_LENGTH;
if (lengthWithoutPromisedId < flags.getNumPaddingLengthBytes()) {
throw protocolError("Frame length %d too small for padding.", payloadLength);
}
}
private void verifyHeadersFrame() throws Http2Exception {
verifyNotProcessingHeaders();
verifyPayloadLength(payloadLength);
int lengthWithoutPriority = flags.getNumPaddingLengthBytes();
if (lengthWithoutPriority < 0) {
throw protocolError("Frame length too small." + payloadLength);
}
if (!flags.isPaddingLengthValid()) {
throw protocolError("Pad high is set but pad low is not");
}
if (lengthWithoutPriority < flags.getNumPaddingLengthBytes()) {
throw protocolError("Frame length %d too small for padding.", payloadLength);
}
}
private void readPingFrame(
ChannelHandlerContext ctx, ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
ByteBuf data = payload.readSlice(payload.readableBytes());
if (flags.ack()) {
observer.onPingAckRead(ctx, data);
} else {
observer.onPingRead(ctx, data);
}
}
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);
}
}
private void verifySettingsFrame() throws Http2Exception {
verifyNotProcessingHeaders();
verifyPayloadLength(payloadLength);
if (streamId != 0) {
throw protocolError("A stream ID must be zero.");
}
if (flags.ack() && payloadLength > 0) {
throw protocolError("Ack settings frame must have an empty payload.");
}
if (payloadLength % SETTING_ENTRY_LENGTH > 0) {
throw protocolError("Frame length %d invalid.", payloadLength);
}
}
private void readDataFrame(
ChannelHandlerContext ctx, ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
int dataPadding = flags.readPaddingLength(payload);
// Determine how much data there is to read by removing the trailing
// padding.
int dataLength = payload.readableBytes() - dataPadding;
if (dataLength < 0) {
throw protocolError("Frame payload too small for padding.");
}
ByteBuf data = payload.readSlice(dataLength);
observer.onDataRead(
ctx,
streamId,
data,
dataPadding,
flags.endOfStream(),
flags.endOfSegment(),
flags.compressed());
payload.skipBytes(payload.readableBytes());
}
private void readSettingsFrame(
ChannelHandlerContext ctx, ByteBuf payload, Http2FrameObserver observer)
throws Http2Exception {
if (flags.ack()) {
observer.onSettingsAckRead(ctx);
} else {
int numSettings = payloadLength / SETTING_ENTRY_LENGTH;
Http2Settings settings = new Http2Settings();
for (int index = 0; index < numSettings; ++index) {
short id = payload.readUnsignedByte();
long value = payload.readUnsignedInt();
switch (id) {
case SETTINGS_HEADER_TABLE_SIZE:
if (value < 0 || value > Integer.MAX_VALUE) {
throw protocolError("Invalid value for HEADER_TABLE_SIZE: %d", value);
}
settings.maxHeaderTableSize((int) value);
break;
case SETTINGS_COMPRESS_DATA:
if (value != 0 && value != 1) {
throw protocolError("Invalid value for COMPRESS_DATA: %d", value);
}
settings.allowCompressedData(value == 1);
break;
case SETTINGS_ENABLE_PUSH:
if (value != 0 && value != 1) {
throw protocolError("Invalid value for ENABLE_PUSH: %d", value);
}
settings.pushEnabled(value == 1);
break;
case SETTINGS_INITIAL_WINDOW_SIZE:
if (value < 0 || value > Integer.MAX_VALUE) {
throw protocolError("Invalid value for INITIAL_WINDOW_SIZE: %d", value);
}
settings.initialWindowSize((int) value);
break;
case SETTINGS_MAX_CONCURRENT_STREAMS:
if (value < 0 || value > Integer.MAX_VALUE) {
throw protocolError("Invalid value for MAX_CONCURRENT_STREAMS: %d", value);
}
settings.maxConcurrentStreams((int) value);
break;
default:
throw protocolError("Unsupport setting: %d", id);
}
}
observer.onSettingsRead(ctx, settings);
}
}
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);
}