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/** @file
*
* A brief file description
*
* @section license License
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
#include "Http3FrameDispatcher.h"
#include "tscore/Diags.h"
#include "QUICIntUtil.h"
#include "Http3DebugNames.h"
//
// Frame Dispatcher
//
void
Http3FrameDispatcher::add_handler(Http3FrameHandler *handler)
{
for (Http3FrameType t : handler->interests()) {
this->_handlers[static_cast<uint8_t>(t)].push_back(handler);
}
}
Http3ErrorUPtr
Http3FrameDispatcher::on_read_ready(QUICStreamId stream_id, IOBufferReader &reader, uint64_t &nread)
{
std::shared_ptr<const Http3Frame> frame(nullptr);
Http3ErrorUPtr error = Http3ErrorUPtr(new Http3NoError());
nread = 0;
while (true) {
// Read a length of Type field and hopefully a length of Length field too
uint8_t head[16];
auto p = reader.memcpy(head, 16);
int64_t read_len = p - reinterpret_cast<char *>(head);
Debug("v_http3", "reading H3 frame: state=%d read_len=%" PRId64, this->_reading_state, read_len);
if (this->_reading_state == READING_TYPE_LEN) {
if (read_len >= 1) {
this->_reading_frame_type_len = QUICVariableInt::size(head);
this->_reading_state = READING_LENGTH_LEN;
Debug("v_http3", "type_len=%" PRId64, this->_reading_frame_type_len);
} else {
break;
}
}
if (this->_reading_state == READING_LENGTH_LEN) {
if (read_len >= this->_reading_frame_type_len + 1) {
this->_reading_frame_length_len = QUICVariableInt::size(head + this->_reading_frame_type_len);
this->_reading_state = READING_PAYLOAD_LEN;
Debug("v_http3", "length_len=%" PRId64, this->_reading_frame_length_len);
} else {
break;
}
}
if (this->_reading_state == READING_PAYLOAD_LEN) {
if (read_len >= this->_reading_frame_type_len + this->_reading_frame_length_len) {
size_t dummy;
QUICVariableInt::decode(this->_reading_frame_payload_len, dummy, head + this->_reading_frame_type_len);
Debug("v_http3", "payload_len=%" PRId64, this->_reading_frame_payload_len);
this->_reading_state = READING_PAYLOAD;
} else {
break;
}
}
if (this->_reading_state == READING_PAYLOAD) {
// Create a frame
// Type field length + Length field length + Payload length
size_t frame_len = this->_reading_frame_type_len + this->_reading_frame_length_len + this->_reading_frame_payload_len;
auto cloned_reader = reader.clone();
frame = this->_frame_factory.fast_create(*cloned_reader, frame_len);
cloned_reader->dealloc();
if (frame == nullptr) {
break;
}
// Consume buffer if frame is created
nread += frame_len;
reader.consume(frame_len);
// Dispatch
Http3FrameType type = frame->type();
Debug("http3", "[RX] [%" PRIu64 "] | %s size=%zu", stream_id, Http3DebugNames::frame_type(type), frame_len);
std::vector<Http3FrameHandler *> handlers = this->_handlers[static_cast<uint8_t>(type)];
for (auto h : handlers) {
error = h->handle_frame(frame);
if (error->cls != Http3ErrorClass::NONE) {
return error;
}
}
this->_reading_state = READING_TYPE_LEN;
}
}
return error;
}
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