nghttp2/src/asio_http2_handler.cc

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/*
* 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_http2_handler.h"
#include <iostream>
#include "http2.h"
#include "util.h"
namespace nghttp2 {
namespace asio_http2 {
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channel::channel() : impl_(util::make_unique<channel_impl>()) {}
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void channel::post(void_cb cb) { impl_->post(std::move(cb)); }
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channel_impl &channel::impl() { return *impl_; }
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channel_impl::channel_impl() : strand_(nullptr) {}
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void channel_impl::post(void_cb cb) { strand_->post(std::move(cb)); }
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void channel_impl::strand(boost::asio::io_service::strand *strand) {
strand_ = strand;
}
namespace server {
extern std::shared_ptr<std::string> cached_date;
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request::request() : impl_(util::make_unique<request_impl>()) {}
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const std::vector<header> &request::headers() const { return impl_->headers(); }
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const std::string &request::method() const { return impl_->method(); }
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const std::string &request::scheme() const { return impl_->scheme(); }
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const std::string &request::authority() const { return impl_->authority(); }
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const std::string &request::host() const { return impl_->host(); }
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const std::string &request::path() const { return impl_->path(); }
bool request::push(std::string method, std::string path,
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std::vector<header> headers) {
return impl_->push(std::move(method), std::move(path), std::move(headers));
}
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bool request::pushed() const { return impl_->pushed(); }
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bool request::closed() const { return impl_->closed(); }
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void request::on_data(data_cb cb) { return impl_->on_data(std::move(cb)); }
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void request::on_end(void_cb cb) { return impl_->on_end(std::move(cb)); }
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bool request::run_task(thread_cb start) {
return impl_->run_task(std::move(start));
}
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request_impl &request::impl() { return *impl_; }
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response::response() : impl_(util::make_unique<response_impl>()) {}
void response::write_head(unsigned int status_code,
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std::vector<header> headers) {
impl_->write_head(status_code, std::move(headers));
}
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void response::end(std::string data) { impl_->end(std::move(data)); }
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void response::end(read_cb cb) { impl_->end(std::move(cb)); }
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void response::resume() { impl_->resume(); }
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unsigned int response::status_code() const { return impl_->status_code(); }
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bool response::started() const { return impl_->started(); }
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response_impl &response::impl() { return *impl_; }
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request_impl::request_impl() : pushed_(false) {}
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const std::vector<header> &request_impl::headers() const { return headers_; }
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const std::string &request_impl::method() const { return method_; }
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const std::string &request_impl::scheme() const { return scheme_; }
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const std::string &request_impl::authority() const { return authority_; }
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const std::string &request_impl::host() const { return host_; }
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const std::string &request_impl::path() const { return path_; }
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void request_impl::set_header(std::vector<header> headers) {
headers_ = std::move(headers);
}
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void request_impl::add_header(std::string name, std::string value) {
headers_.push_back(header{std::move(name), std::move(value)});
}
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void request_impl::method(std::string arg) { method_ = std::move(arg); }
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void request_impl::scheme(std::string arg) { scheme_ = std::move(arg); }
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void request_impl::authority(std::string arg) { authority_ = std::move(arg); }
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void request_impl::host(std::string arg) { host_ = std::move(arg); }
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void request_impl::path(std::string arg) { path_ = std::move(arg); }
bool request_impl::push(std::string method, std::string path,
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std::vector<header> headers) {
if (closed()) {
return false;
}
auto handler = handler_.lock();
auto stream = stream_.lock();
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auto rv = handler->push_promise(*stream, std::move(method), std::move(path),
std::move(headers));
return rv == 0;
}
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bool request_impl::pushed() const { return pushed_; }
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void request_impl::pushed(bool f) { pushed_ = f; }
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bool request_impl::closed() const {
return handler_.expired() || stream_.expired();
}
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void request_impl::on_data(data_cb cb) { on_data_cb_ = std::move(cb); }
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void request_impl::on_end(void_cb cb) { on_end_cb_ = std::move(cb); }
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bool request_impl::run_task(thread_cb start) {
if (closed()) {
return false;
}
auto handler = handler_.lock();
return handler->run_task(std::move(start));
}
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void request_impl::handler(std::weak_ptr<http2_handler> h) {
handler_ = std::move(h);
}
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void request_impl::stream(std::weak_ptr<http2_stream> s) {
stream_ = std::move(s);
}
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void request_impl::call_on_data(const uint8_t *data, std::size_t len) {
if (on_data_cb_) {
on_data_cb_(data, len);
}
}
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void request_impl::call_on_end() {
if (on_end_cb_) {
on_end_cb_();
}
}
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response_impl::response_impl() : status_code_(200), started_(false) {}
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unsigned int response_impl::status_code() const { return status_code_; }
void response_impl::write_head(unsigned int status_code,
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std::vector<header> headers) {
status_code_ = status_code;
headers_ = std::move(headers);
}
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void response_impl::end(std::string data) {
if (started_) {
return;
}
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auto strio = std::make_shared<std::pair<std::string, size_t>>(std::move(data),
data.size());
auto read_cb = [strio](uint8_t *buf, size_t len) {
auto nread = std::min(len, strio->second);
memcpy(buf, strio->first.c_str(), nread);
strio->second -= nread;
if (strio->second == 0) {
return std::make_pair(nread, true);
}
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return std::make_pair(nread, false);
};
end(std::move(read_cb));
}
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void response_impl::end(read_cb cb) {
if (started_ || closed()) {
return;
}
read_cb_ = std::move(cb);
started_ = true;
auto handler = handler_.lock();
auto stream = stream_.lock();
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if (handler->start_response(*stream) != 0) {
handler->stream_error(stream->get_stream_id(), NGHTTP2_INTERNAL_ERROR);
return;
}
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if (!handler->inside_callback()) {
handler->initiate_write();
}
}
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bool response_impl::closed() const {
return handler_.expired() || stream_.expired();
}
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void response_impl::resume() {
if (closed()) {
return;
}
auto handler = handler_.lock();
auto stream = stream_.lock();
handler->resume(*stream);
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if (!handler->inside_callback()) {
handler->initiate_write();
}
}
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bool response_impl::started() const { return started_; }
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const std::vector<header> &response_impl::headers() const { return headers_; }
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void response_impl::handler(std::weak_ptr<http2_handler> h) {
handler_ = std::move(h);
}
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void response_impl::stream(std::weak_ptr<http2_stream> s) {
stream_ = std::move(s);
}
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std::pair<ssize_t, bool> response_impl::call_read(uint8_t *data,
std::size_t len) {
if (read_cb_) {
return read_cb_(data, len);
}
return std::make_pair(0, true);
}
http2_stream::http2_stream(int32_t stream_id)
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: request_(std::make_shared<request>()),
response_(std::make_shared<response>()), stream_id_(stream_id) {}
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int32_t http2_stream::get_stream_id() const { return stream_id_; }
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const std::shared_ptr<request> &http2_stream::get_request() { return request_; }
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const std::shared_ptr<response> &http2_stream::get_response() {
return response_;
}
namespace {
int stream_error(nghttp2_session *session, int32_t stream_id,
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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,
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const nghttp2_frame *frame, void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
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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 {
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int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
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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;
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if (frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
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auto stream = handler->find_stream(stream_id);
if (!stream) {
return 0;
}
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if (!nghttp2_check_header_name(name, namelen) ||
!nghttp2_check_header_value(value, valuelen)) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
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auto &req = stream->get_request()->impl();
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if (name[0] == ':' && !req.headers().empty()) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
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if (util::streq(":method", name, namelen)) {
if (!req.method().empty()) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
req.method(std::string(value, value + valuelen));
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} else if (util::streq(":scheme", name, namelen)) {
if (!req.scheme().empty()) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
req.scheme(std::string(value, value + valuelen));
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} else if (util::streq(":authority", name, namelen)) {
if (!req.authority().empty()) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
req.authority(std::string(value, value + valuelen));
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} else if (util::streq(":path", name, namelen)) {
if (!req.path().empty()) {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
req.path(std::string(value, value + valuelen));
} else {
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if (name[0] == ':') {
stream_error(session, stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
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if (util::streq("host", name, namelen)) {
req.host(std::string(value, value + valuelen));
}
req.add_header(std::string(name, name + namelen),
std::string(value, value + valuelen));
}
return 0;
}
} // namespace
namespace {
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int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto stream = handler->find_stream(frame->hd.stream_id);
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switch (frame->hd.type) {
case NGHTTP2_DATA:
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if (!stream) {
break;
}
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if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
stream->get_request()->impl().call_on_end();
}
break;
case NGHTTP2_HEADERS: {
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if (!stream || frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
break;
}
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auto &req = stream->get_request()->impl();
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if (req.method().empty() || req.scheme().empty() || req.path().empty() ||
(req.authority().empty() && req.host().empty())) {
stream_error(session, frame->hd.stream_id, NGHTTP2_PROTOCOL_ERROR);
return 0;
}
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if (req.host().empty()) {
req.host(req.authority());
}
handler->call_on_request(*stream);
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if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
stream->get_request()->impl().call_on_end();
}
break;
}
}
return 0;
}
} // namespace
namespace {
int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
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int32_t stream_id, const uint8_t *data,
size_t len, void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
auto stream = handler->find_stream(stream_id);
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if (!stream) {
return 0;
}
stream->get_request()->impl().call_on_data(data, len);
return 0;
}
} // namespace
namespace {
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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);
handler->close_stream(stream_id);
return 0;
}
} // namespace
namespace {
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int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto handler = static_cast<http2_handler *>(user_data);
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if (frame->hd.type != NGHTTP2_PUSH_PROMISE) {
return 0;
}
auto stream = handler->find_stream(frame->push_promise.promised_stream_id);
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if (!stream) {
return 0;
}
handler->call_on_request(*stream);
return 0;
}
} // namespace
namespace {
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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
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http2_handler::http2_handler(boost::asio::io_service &io_service,
boost::asio::io_service &task_io_service_,
connection_write writefun, request_cb cb)
: writefun_(writefun), request_cb_(std::move(cb)), io_service_(io_service),
task_io_service_(task_io_service_),
strand_(std::make_shared<boost::asio::io_service::strand>(io_service_)),
session_(nullptr), buf_(nullptr), buflen_(0), inside_callback_(false) {}
http2_handler::~http2_handler() { nghttp2_session_del(session_); }
int http2_handler::start() {
int rv;
nghttp2_session_callbacks *callbacks;
rv = nghttp2_session_callbacks_new(&callbacks);
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if (rv != 0) {
return -1;
}
auto cb_del = util::defer(callbacks, nghttp2_session_callbacks_del);
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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);
nghttp2_option *option;
rv = nghttp2_option_new(&option);
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if (rv != 0) {
return -1;
}
auto opt_del = util::defer(option, nghttp2_option_del);
nghttp2_option_set_recv_client_preface(option, 1);
rv = nghttp2_session_server_new2(&session_, callbacks, this, option);
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if (rv != 0) {
return -1;
}
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nghttp2_settings_entry ent{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100};
nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, &ent, 1);
return 0;
}
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std::shared_ptr<http2_stream> http2_handler::create_stream(int32_t stream_id) {
auto stream = std::make_shared<http2_stream>(stream_id);
streams_.emplace(stream_id, stream);
auto self = shared_from_this();
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auto &req = stream->get_request()->impl();
auto &res = stream->get_response()->impl();
req.handler(self);
req.stream(stream);
res.handler(self);
res.stream(stream);
return stream;
}
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void http2_handler::close_stream(int32_t stream_id) {
streams_.erase(stream_id);
}
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std::shared_ptr<http2_stream> http2_handler::find_stream(int32_t stream_id) {
auto i = streams_.find(stream_id);
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if (i == std::end(streams_)) {
return nullptr;
}
return (*i).second;
}
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void http2_handler::call_on_request(http2_stream &stream) {
request_cb_(stream.get_request(), stream.get_response());
}
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bool http2_handler::should_stop() const {
return !nghttp2_session_want_read(session_) &&
!nghttp2_session_want_write(session_);
}
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int http2_handler::start_response(http2_stream &stream) {
int rv;
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auto &res = stream.get_response()->impl();
auto &headers = res.headers();
auto nva = std::vector<nghttp2_nv>();
nva.reserve(2 + headers.size());
auto status = util::utos(res.status_code());
auto date = cached_date;
nva.push_back(nghttp2::http2::make_nv_ls(":status", status));
nva.push_back(nghttp2::http2::make_nv_ls("date", *date));
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for (auto &hd : headers) {
nva.push_back(nghttp2::http2::make_nv(hd.name, hd.value));
}
nghttp2_data_provider prd;
prd.source.ptr = &stream;
prd.read_callback =
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[](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 &stream = *static_cast<http2_stream *>(source->ptr);
auto rv = stream.get_response()->impl().call_read(buf, length);
if (rv.first < 0) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
if (rv.second) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
} else if (rv.first == 0) {
return NGHTTP2_ERR_DEFERRED;
}
return rv.first;
};
rv = nghttp2_submit_response(session_, stream.get_stream_id(), nva.data(),
nva.size(), &prd);
if (rv != 0) {
return -1;
}
return 0;
}
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void http2_handler::enter_callback() {
assert(!inside_callback_);
inside_callback_ = true;
}
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void http2_handler::leave_callback() {
assert(inside_callback_);
inside_callback_ = false;
}
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bool http2_handler::inside_callback() const { return inside_callback_; }
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void http2_handler::stream_error(int32_t stream_id, uint32_t error_code) {
::nghttp2::asio_http2::server::stream_error(session_, stream_id, error_code);
}
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void http2_handler::initiate_write() { writefun_(); }
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void http2_handler::resume(http2_stream &stream) {
nghttp2_session_resume_data(session_, stream.get_stream_id());
}
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int http2_handler::push_promise(http2_stream &stream, std::string method,
std::string path, std::vector<header> headers) {
int rv;
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auto &req = stream.get_request()->impl();
auto nva = std::vector<nghttp2_nv>();
nva.reserve(5 + headers.size());
nva.push_back(nghttp2::http2::make_nv_ls(":method", method));
nva.push_back(nghttp2::http2::make_nv_ls(":scheme", req.scheme()));
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if (!req.authority().empty()) {
nva.push_back(nghttp2::http2::make_nv_ls(":authority", req.authority()));
}
nva.push_back(nghttp2::http2::make_nv_ls(":path", path));
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if (!req.host().empty()) {
nva.push_back(nghttp2::http2::make_nv_ls("host", req.host()));
}
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for (auto &hd : headers) {
nva.push_back(nghttp2::http2::make_nv(hd.name, hd.value));
}
rv = nghttp2_submit_push_promise(session_, NGHTTP2_FLAG_NONE,
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stream.get_stream_id(), nva.data(),
nva.size(), nullptr);
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if (rv < 0) {
return -1;
}
auto promised_stream = create_stream(rv);
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auto &promised_req = promised_stream->get_request()->impl();
promised_req.pushed(true);
promised_req.method(std::move(method));
promised_req.scheme(req.scheme());
promised_req.authority(req.authority());
promised_req.path(std::move(path));
promised_req.host(req.host());
promised_req.set_header(std::move(headers));
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if (!req.host().empty()) {
promised_req.add_header("host", req.host());
}
return 0;
}
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bool http2_handler::run_task(thread_cb start) {
auto strand = strand_;
try {
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task_io_service_.post([start, strand]() {
channel chan;
chan.impl().strand(strand.get());
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start(chan);
});
return true;
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} catch (std::exception &ex) {
return false;
}
}
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boost::asio::io_service &http2_handler::io_service() { return io_service_; }
2014-09-23 17:57:43 +02:00
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callback_guard::callback_guard(http2_handler &h) : handler(h) {
handler.enter_callback();
}
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callback_guard::~callback_guard() { handler.leave_callback(); }
} // namespace server
} // namespace asio_http2
} // namespace nghttp2