/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "asio_server_http2_handler.h"
#include <iostream>
#include "asio_common.h"
#include "asio_server_serve_mux.h"
#include "asio_server_stream.h"
#include "asio_server_request_impl.h"
#include "asio_server_response_impl.h"
#include "http2.h"
#include "util.h"
#include "template.h"
namespace nghttp2 {
namespace asio_http2 {
namespace server {
namespace {
int stream_error(nghttp2_session *session, int32_t stream_id,
uint32_t error_code) {
return nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, stream_id,
error_code);
}
} // namespace
namespace {
int on_begin_headers_callback(nghttp2_session *session,
const nghttp2_frame *frame, void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
if (frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
handler->create_stream(frame->hd.stream_id);
return 0;
}
} // namespace
namespace {
int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen, uint8_t flags,
void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto stream_id = frame->hd.stream_id;
if (frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
auto strm = handler->find_stream(stream_id);
if (!strm) {
return 0;
}
auto &req = strm->request().impl();
auto &uref = req.uri();
switch (nghttp2::http2::lookup_token(name, namelen)) {
case nghttp2::http2::HD__METHOD:
req.method(std::string(value, value + valuelen));
break;
case nghttp2::http2::HD__SCHEME:
uref.scheme.assign(value, value + valuelen);
break;
case nghttp2::http2::HD__AUTHORITY:
uref.host.assign(value, value + valuelen);
break;
case nghttp2::http2::HD__PATH:
split_path(uref, value, value + valuelen);
break;
case nghttp2::http2::HD_HOST:
if (uref.host.empty()) {
uref.host.assign(value, value + valuelen);
}
// fall through
default:
if (req.header_buffer_size() + namelen + valuelen > 64_k) {
nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
break;
}
req.update_header_buffer_size(namelen + valuelen);
req.header().emplace(std::string(name, name + namelen),
header_value{std::string(value, value + valuelen),
(flags & NGHTTP2_NV_FLAG_NO_INDEX) != 0});
}
return 0;
}
} // namespace
namespace {
int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto strm = handler->find_stream(frame->hd.stream_id);
switch (frame->hd.type) {
case NGHTTP2_DATA:
if (!strm) {
break;
}
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
strm->request().impl().call_on_data(nullptr, 0);
}
break;
case NGHTTP2_HEADERS: {
if (!strm || frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
break;
}
auto &req = strm->request().impl();
req.remote_endpoint(handler->remote_endpoint());
handler->call_on_request(*strm);
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
strm->request().impl().call_on_data(nullptr, 0);
}
break;
}
}
return 0;
}
} // namespace
namespace {
int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
int32_t stream_id, const uint8_t *data,
size_t len, void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto strm = handler->find_stream(stream_id);
if (!strm) {
return 0;
}
strm->request().impl().call_on_data(data, len);
return 0;
}
} // namespace
namespace {
int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
uint32_t error_code, void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto strm = handler->find_stream(stream_id);
if (!strm) {
return 0;
}
strm->response().impl().call_on_close(error_code);
handler->close_stream(stream_id);
return 0;
}
} // namespace
namespace {
int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
if (frame->hd.type != NGHTTP2_PUSH_PROMISE) {
return 0;
}
auto strm = handler->find_stream(frame->push_promise.promised_stream_id);
if (!strm) {
return 0;
}
auto &res = strm->response().impl();
res.push_promise_sent();
return 0;
}
} // namespace
namespace {
int on_frame_not_send_callback(nghttp2_session *session,
const nghttp2_frame *frame, int lib_error_code,
void *user_data) {
if (frame->hd.type != NGHTTP2_HEADERS) {
return 0;
}
// Issue RST_STREAM so that stream does not hang around.
nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
return 0;
}
} // namespace
http2_handler::http2_handler(boost::asio::io_service &io_service,
boost::asio::ip::tcp::endpoint ep,
connection_write writefun, serve_mux &mux)
: writefun_(writefun),
mux_(mux),
io_service_(io_service),
remote_ep_(ep),
session_(nullptr),
buf_(nullptr),
buflen_(0),
inside_callback_(false),
write_signaled_(false),
tstamp_cached_(time(nullptr)),
formatted_date_(util::http_date(tstamp_cached_)) {}
http2_handler::~http2_handler() {
for (auto &p : streams_) {
auto &strm = p.second;
strm->response().impl().call_on_close(NGHTTP2_INTERNAL_ERROR);
}
nghttp2_session_del(session_);
}
const std::string &http2_handler::http_date() {
auto t = time(nullptr);
if (t != tstamp_cached_) {
tstamp_cached_ = t;
formatted_date_ = util::http_date(t);
}
return formatted_date_;
}
int http2_handler::start() {
int rv;
nghttp2_session_callbacks *callbacks;
rv = nghttp2_session_callbacks_new(&callbacks);
if (rv != 0) {
return -1;
}
auto cb_del = defer(nghttp2_session_callbacks_del, callbacks);
nghttp2_session_callbacks_set_on_begin_headers_callback(
callbacks, on_begin_headers_callback);
nghttp2_session_callbacks_set_on_header_callback(callbacks,
on_header_callback);
nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
on_frame_recv_callback);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
callbacks, on_data_chunk_recv_callback);
nghttp2_session_callbacks_set_on_stream_close_callback(
callbacks, on_stream_close_callback);
nghttp2_session_callbacks_set_on_frame_send_callback(callbacks,
on_frame_send_callback);
nghttp2_session_callbacks_set_on_frame_not_send_callback(
callbacks, on_frame_not_send_callback);
rv = nghttp2_session_server_new(&session_, callbacks, this);
if (rv != 0) {
return -1;
}
nghttp2_settings_entry ent{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100};
nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, &ent, 1);
return 0;
}
stream *http2_handler::create_stream(int32_t stream_id) {
auto p = streams_.emplace(stream_id, make_unique<stream>(this, stream_id));
assert(p.second);
return (*p.first).second.get();
}
void http2_handler::close_stream(int32_t stream_id) {
streams_.erase(stream_id);
}
stream *http2_handler::find_stream(int32_t stream_id) {
auto i = streams_.find(stream_id);
if (i == std::end(streams_)) {
return nullptr;
}
return (*i).second.get();
}
void http2_handler::call_on_request(stream &strm) {
auto cb = mux_.handler(strm.request().impl());
cb(strm.request(), strm.response());
}
bool http2_handler::should_stop() const {
return !nghttp2_session_want_read(session_) &&
!nghttp2_session_want_write(session_);
}
int http2_handler::start_response(stream &strm) {
int rv;
auto &res = strm.response().impl();
auto &header = res.header();
auto nva = std::vector<nghttp2_nv>();
nva.reserve(2 + header.size());
auto status = util::utos(res.status_code());
auto date = http_date();
nva.push_back(nghttp2::http2::make_nv_ls(":status", status));
nva.push_back(nghttp2::http2::make_nv_ls("date", date));
for (auto &hd : header) {
nva.push_back(nghttp2::http2::make_nv(hd.first, hd.second.value,
hd.second.sensitive));
}
nghttp2_data_provider *prd_ptr = nullptr, prd;
auto &req = strm.request().impl();
if (::nghttp2::http2::expect_response_body(req.method(), res.status_code())) {
prd.source.ptr = &strm;
prd.read_callback = [](nghttp2_session *session, int32_t stream_id,
uint8_t *buf, size_t length, uint32_t *data_flags,
nghttp2_data_source *source,
void *user_data) -> ssize_t {
auto &strm = *static_cast<stream *>(source->ptr);
return strm.response().impl().call_read(buf, length, data_flags);
};
prd_ptr = &prd;
}
rv = nghttp2_submit_response(session_, strm.get_stream_id(), nva.data(),
nva.size(), prd_ptr);
if (rv != 0) {
return -1;
}
signal_write();
return 0;
}
int http2_handler::submit_trailer(stream &strm, header_map h) {
int rv;
auto nva = std::vector<nghttp2_nv>();
nva.reserve(h.size());
for (auto &hd : h) {
nva.push_back(nghttp2::http2::make_nv(hd.first, hd.second.value,
hd.second.sensitive));
}
rv = nghttp2_submit_trailer(session_, strm.get_stream_id(), nva.data(),
nva.size());
if (rv != 0) {
return -1;
}
signal_write();
return 0;
}
void http2_handler::enter_callback() {
assert(!inside_callback_);
inside_callback_ = true;
}
void http2_handler::leave_callback() {
assert(inside_callback_);
inside_callback_ = false;
}
void http2_handler::stream_error(int32_t stream_id, uint32_t error_code) {
::nghttp2::asio_http2::server::stream_error(session_, stream_id, error_code);
signal_write();
}
void http2_handler::signal_write() {
if (!inside_callback_ && !write_signaled_) {
write_signaled_ = true;
auto self = shared_from_this();
io_service_.post([self]() { self->initiate_write(); });
}
}
void http2_handler::initiate_write() {
write_signaled_ = false;
writefun_();
}
void http2_handler::resume(stream &strm) {
nghttp2_session_resume_data(session_, strm.get_stream_id());
signal_write();
}
response *http2_handler::push_promise(boost::system::error_code &ec,
stream &strm, std::string method,
std::string raw_path_query,
header_map h) {
int rv;
ec.clear();
auto &req = strm.request().impl();
auto nva = std::vector<nghttp2_nv>();
nva.reserve(4 + h.size());
nva.push_back(nghttp2::http2::make_nv_ls(":method", method));
nva.push_back(nghttp2::http2::make_nv_ls(":scheme", req.uri().scheme));
nva.push_back(nghttp2::http2::make_nv_ls(":authority", req.uri().host));
nva.push_back(nghttp2::http2::make_nv_ls(":path", raw_path_query));
for (auto &hd : h) {
nva.push_back(nghttp2::http2::make_nv(hd.first, hd.second.value,
hd.second.sensitive));
}
rv = nghttp2_submit_push_promise(session_, NGHTTP2_FLAG_NONE,
strm.get_stream_id(), nva.data(), nva.size(),
nullptr);
if (rv < 0) {
ec = make_error_code(static_cast<nghttp2_error>(rv));
return nullptr;
}
auto promised_strm = create_stream(rv);
auto &promised_req = promised_strm->request().impl();
promised_req.header(std::move(h));
promised_req.method(std::move(method));
auto &uref = promised_req.uri();
uref.scheme = req.uri().scheme;
uref.host = req.uri().host;
split_path(uref, std::begin(raw_path_query), std::end(raw_path_query));
auto &promised_res = promised_strm->response().impl();
promised_res.pushed(true);
signal_write();
return &promised_strm->response();
}
boost::asio::io_service &http2_handler::io_service() { return io_service_; }
const boost::asio::ip::tcp::endpoint &http2_handler::remote_endpoint() {
return remote_ep_;
}
callback_guard::callback_guard(http2_handler &h) : handler(h) {
handler.enter_callback();
}
callback_guard::~callback_guard() { handler.leave_callback(); }
} // namespace server
} // namespace asio_http2
} // namespace nghttp2