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239 lines (179 loc) · 4.87 KB
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#include "ServerHttp2.h"
#include "../../transfer/http2/HPack.h"
#include <array>
#include <random>
namespace HttpServer
{
ServerHttp2::ServerHttp2(
Socket::Adapter *sock,
Http2::OutStream *stream
) noexcept
: ServerProtocol(sock), stream(stream)
{
}
ServerHttp2::~ServerHttp2() noexcept {
delete this->stream;
}
static uint8_t getPaddingSize(const size_t dataSize)
{
if (0 == dataSize) {
return 0;
}
std::random_device rd;
uint8_t padding = uint8_t(rd());
while (dataSize <= padding) {
padding /= 2;
}
return padding;
}
bool ServerHttp2::sendHeaders(
const Http::StatusCode status,
std::vector<std::pair<std::string, std::string> > &headers,
const std::chrono::milliseconds &timeout,
const bool endStream
) const {
std::vector<char> buf;
buf.reserve(4096);
buf.resize(
Http2::FRAME_HEADER_SIZE + sizeof(uint8_t)
);
headers.emplace(
headers.begin(),
":status",
std::to_string(static_cast<int>(status) )
);
HPack::pack(buf, headers, this->stream->dynamic_table);
size_t data_size = (
buf.size() - Http2::FRAME_HEADER_SIZE - sizeof(uint8_t)
);
const uint8_t padding = getPaddingSize(data_size);
const uint16_t padding_size = padding + sizeof(uint8_t);
if (data_size + padding_size > this->stream->settings.max_frame_size) {
data_size = this->stream->settings.max_frame_size - padding_size;
}
const uint32_t frame_size = static_cast<uint32_t>(
data_size + padding_size
);
buf.resize(
frame_size + Http2::FRAME_HEADER_SIZE
);
Http2::FrameFlag flags = Http2::FrameFlag::END_HEADERS;
if (endStream) {
flags |= Http2::FrameFlag::END_STREAM;
}
flags |= Http2::FrameFlag::PADDED;
buf[Http2::FRAME_HEADER_SIZE] = char(padding);
if (padding) {
std::fill(
buf.end() - padding,
buf.end(),
0
);
}
this->stream->setHttp2FrameHeader(
reinterpret_cast<uint8_t *>(buf.data() ),
frame_size,
Http2::FrameType::HEADERS,
flags
);
const std::unique_lock<std::mutex> lock(*this->stream->mtx);
return this->sock->nonblock_send(buf.data(), buf.size(), timeout) > 0;
}
void ServerHttp2::sendWindowUpdate(
const uint32_t size,
const std::chrono::milliseconds &timeout
) const {
std::array<uint8_t, Http2::FRAME_HEADER_SIZE + sizeof(uint32_t)> buf;
uint8_t *addr = buf.data();
addr = this->stream->setHttp2FrameHeader(
addr,
sizeof(uint32_t),
Http2::FrameType::WINDOW_UPDATE,
Http2::FrameFlag::EMPTY
);
*reinterpret_cast<uint32_t *>(addr) = ::htonl(size);
const std::unique_lock<std::mutex> lock(*this->stream->mtx);
this->sock->nonblock_send(buf.data(), buf.size(), timeout);
}
long ServerHttp2::sendData(
const void *src,
const size_t size,
const std::chrono::milliseconds &timeout,
const bool endStream
) const noexcept {
const uint8_t *data = reinterpret_cast<const uint8_t *>(src);
std::vector<uint8_t> buf;
buf.reserve(
this->stream->settings.max_frame_size + Http2::FRAME_HEADER_SIZE
);
size_t total = 0;
while (total < size)
{
size_t data_size = (size - total < this->stream->settings.max_frame_size)
? size - total
: this->stream->settings.max_frame_size;
const uint8_t padding = getPaddingSize(data_size);
const uint16_t padding_size = padding + sizeof(uint8_t);
if (data_size + padding_size > this->stream->settings.max_frame_size) {
data_size = this->stream->settings.max_frame_size - padding_size;
}
const uint32_t frame_size = static_cast<uint32_t>(
data_size + padding_size
);
buf.resize(frame_size + Http2::FRAME_HEADER_SIZE);
if (this->stream->window_size_out - long(this->stream->settings.max_frame_size) <= 0)
{
size_t update_size = this->stream->settings.initial_window_size +
(size - total) - size_t(this->stream->window_size_out);
if (update_size > Http2::MAX_WINDOW_UPDATE) {
update_size = Http2::MAX_WINDOW_UPDATE;
}
this->sendWindowUpdate(uint32_t(update_size), timeout);
this->stream->window_size_out += update_size;
}
Http2::FrameFlag flags = Http2::FrameFlag::EMPTY;
if (endStream && (total + data_size >= size) ) {
flags |= Http2::FrameFlag::END_STREAM;
}
size_t cur = Http2::FRAME_HEADER_SIZE;
if (padding_size) {
flags |= Http2::FrameFlag::PADDED;
buf[cur] = padding;
++cur;
}
this->stream->setHttp2FrameHeader(
buf.data(),
frame_size,
Http2::FrameType::DATA,
flags
);
std::copy(
data,
data + data_size,
buf.data() + cur
);
if (padding) {
std::fill(
buf.end() - padding,
buf.end(),
0
);
}
this->stream->lock();
const long sended = this->sock->nonblock_send(
buf.data(),
buf.size(),
timeout
);
this->stream->unlock();
if (sended <= 0) {
total = 0;
break;
}
this->stream->window_size_out -= frame_size;
data += data_size;
total += data_size;
}
return long(total);
}
}