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nghttp2/src/asio_client_session_impl.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2015 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_client_session_impl.h"
#include <iostream>
#include "asio_client_stream.h"
#include "asio_client_request_impl.h"
#include "asio_client_response_impl.h"
#include "asio_common.h"
#include "template.h"
#include "util.h"
#include "http2.h"
namespace nghttp2 {
namespace asio_http2 {
namespace client {
session_impl::session_impl(
boost::asio::io_service &io_service,
const boost::posix_time::time_duration &connect_timeout)
: wblen_(0),
io_service_(io_service),
resolver_(io_service),
deadline_(io_service),
connect_timeout_(connect_timeout),
read_timeout_(boost::posix_time::seconds(60)),
session_(nullptr),
data_pending_(nullptr),
data_pendinglen_(0),
writing_(false),
inside_callback_(false),
stopped_(false) {}
session_impl::~session_impl() {
// finish up all active stream
for (auto &p : streams_) {
auto &strm = p.second;
auto &req = strm->request().impl();
req.call_on_close(NGHTTP2_INTERNAL_ERROR);
}
nghttp2_session_del(session_);
}
void session_impl::start_resolve(const std::string &host,
const std::string &service) {
deadline_.expires_from_now(connect_timeout_);
auto self = this->shared_from_this();
resolver_.async_resolve({host, service},
[this, self](const boost::system::error_code &ec,
tcp::resolver::iterator endpoint_it) {
if (ec) {
not_connected(ec);
return;
}
start_connect(endpoint_it);
});
deadline_.async_wait(std::bind(&session_impl::handle_deadline, self));
}
void session_impl::handle_deadline() {
if (stopped_) {
return;
}
if (deadline_.expires_at() <=
boost::asio::deadline_timer::traits_type::now()) {
call_error_cb(boost::asio::error::timed_out);
stop();
deadline_.expires_at(boost::posix_time::pos_infin);
return;
}
deadline_.async_wait(
std::bind(&session_impl::handle_deadline, this->shared_from_this()));
}
void session_impl::connected(tcp::resolver::iterator endpoint_it) {
if (!setup_session()) {
return;
}
socket().set_option(boost::asio::ip::tcp::no_delay(true));
do_write();
do_read();
auto &connect_cb = on_connect();
if (connect_cb) {
connect_cb(endpoint_it);
}
}
void session_impl::not_connected(const boost::system::error_code &ec) {
call_error_cb(ec);
stop();
}
void session_impl::on_connect(connect_cb cb) { connect_cb_ = std::move(cb); }
void session_impl::on_error(error_cb cb) { error_cb_ = std::move(cb); }
const connect_cb &session_impl::on_connect() const { return connect_cb_; }
const error_cb &session_impl::on_error() const { return error_cb_; }
void session_impl::call_error_cb(const boost::system::error_code &ec) {
if (stopped_) {
return;
}
auto &error_cb = on_error();
if (!error_cb) {
return;
}
error_cb(ec);
}
namespace {
int on_begin_headers_callback(nghttp2_session *session,
const nghttp2_frame *frame, void *user_data) {
if (frame->hd.type != NGHTTP2_PUSH_PROMISE) {
return 0;
}
auto sess = static_cast<session_impl *>(user_data);
sess->create_push_stream(frame->push_promise.promised_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 sess = static_cast<session_impl *>(user_data);
stream *strm;
switch (frame->hd.type) {
case NGHTTP2_HEADERS: {
strm = sess->find_stream(frame->hd.stream_id);
if (!strm) {
return 0;
}
// ignore trailers
if (frame->headers.cat == NGHTTP2_HCAT_HEADERS &&
!strm->expect_final_response()) {
return 0;
}
auto token = http2::lookup_token(name, namelen);
auto &res = strm->response().impl();
if (token == http2::HD__STATUS) {
res.status_code(util::parse_uint(value, valuelen));
} else {
if (res.header_buffer_size() + namelen + valuelen > 64_k) {
nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
frame->hd.stream_id, NGHTTP2_INTERNAL_ERROR);
break;
}
res.update_header_buffer_size(namelen + valuelen);
if (token == http2::HD_CONTENT_LENGTH) {
res.content_length(util::parse_uint(value, valuelen));
}
res.header().emplace(
std::string(name, name + namelen),
header_value{std::string(value, value + valuelen),
(flags & NGHTTP2_NV_FLAG_NO_INDEX) != 0});
}
break;
}
case NGHTTP2_PUSH_PROMISE: {
strm = sess->find_stream(frame->push_promise.promised_stream_id);
if (!strm) {
return 0;
}
auto &req = strm->request().impl();
auto &uri = req.uri();
switch (http2::lookup_token(name, namelen)) {
case http2::HD__METHOD:
req.method(std::string(value, value + valuelen));
break;
case http2::HD__SCHEME:
uri.scheme.assign(value, value + valuelen);
break;
case http2::HD__PATH:
split_path(uri, value, value + valuelen);
break;
case http2::HD__AUTHORITY:
uri.host.assign(value, value + valuelen);
break;
case http2::HD_HOST:
if (uri.host.empty()) {
uri.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});
}
break;
}
default:
return 0;
}
return 0;
}
} // namespace
namespace {
int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto sess = static_cast<session_impl *>(user_data);
auto strm = sess->find_stream(frame->hd.stream_id);
switch (frame->hd.type) {
case NGHTTP2_DATA: {
if (!strm) {
return 0;
}
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
strm->response().impl().call_on_data(nullptr, 0);
}
break;
}
case NGHTTP2_HEADERS: {
if (!strm) {
return 0;
}
// ignore trailers
if (frame->headers.cat == NGHTTP2_HCAT_HEADERS &&
!strm->expect_final_response()) {
return 0;
}
if (strm->expect_final_response()) {
// wait for final response
return 0;
}
auto &req = strm->request().impl();
req.call_on_response(strm->response());
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
strm->response().impl().call_on_data(nullptr, 0);
}
break;
}
case NGHTTP2_PUSH_PROMISE: {
if (!strm) {
return 0;
}
auto push_strm = sess->find_stream(frame->push_promise.promised_stream_id);
if (!push_strm) {
return 0;
}
strm->request().impl().call_on_push(push_strm->request());
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 sess = static_cast<session_impl *>(user_data);
auto strm = sess->find_stream(stream_id);
if (!strm) {
return 0;
}
auto &res = strm->response().impl();
res.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 sess = static_cast<session_impl *>(user_data);
auto strm = sess->pop_stream(stream_id);
if (!strm) {
return 0;
}
strm->request().impl().call_on_close(error_code);
return 0;
}
} // namespace
bool session_impl::setup_session() {
nghttp2_session_callbacks *callbacks;
nghttp2_session_callbacks_new(&callbacks);
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);
auto rv = nghttp2_session_client_new(&session_, callbacks, this);
if (rv != 0) {
call_error_cb(make_error_code(static_cast<nghttp2_error>(rv)));
return false;
}
const uint32_t window_size = 256_m;
std::array<nghttp2_settings_entry, 2> iv{
{{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100},
// typically client is just a *sink* and just process data as
// much as possible. Use large window size by default.
{NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, window_size}}};
nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, iv.data(), iv.size());
// increase connection window size up to window_size
nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE, 0,
window_size -
NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE);
return true;
}
int session_impl::write_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.stream_id(), nva.data(),
nva.size());
if (rv != 0) {
return -1;
}
signal_write();
return 0;
}
void session_impl::cancel(stream &strm, uint32_t error_code) {
if (stopped_) {
return;
}
nghttp2_submit_rst_stream(session_, NGHTTP2_FLAG_NONE, strm.stream_id(),
error_code);
signal_write();
}
void session_impl::resume(stream &strm) {
if (stopped_) {
return;
}
nghttp2_session_resume_data(session_, strm.stream_id());
signal_write();
}
stream *session_impl::find_stream(int32_t stream_id) {
auto it = streams_.find(stream_id);
if (it == std::end(streams_)) {
return nullptr;
}
return (*it).second.get();
}
std::unique_ptr<stream> session_impl::pop_stream(int32_t stream_id) {
auto it = streams_.find(stream_id);
if (it == std::end(streams_)) {
return nullptr;
}
auto strm = std::move((*it).second);
streams_.erase(it);
return strm;
}
stream *session_impl::create_push_stream(int32_t stream_id) {
auto strm = create_stream();
strm->stream_id(stream_id);
auto p = streams_.emplace(stream_id, std::move(strm));
assert(p.second);
return (*p.first).second.get();
}
std::unique_ptr<stream> session_impl::create_stream() {
return make_unique<stream>(this);
}
const request *session_impl::submit(boost::system::error_code &ec,
const std::string &method,
const std::string &uri, generator_cb cb,
header_map h) {
ec.clear();
if (stopped_) {
ec = make_error_code(static_cast<nghttp2_error>(NGHTTP2_INTERNAL_ERROR));
return nullptr;
}
http_parser_url u{};
// TODO Handle CONNECT method
if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) != 0) {
ec = make_error_code(boost::system::errc::invalid_argument);
return nullptr;
}
if ((u.field_set & (1 << UF_SCHEMA)) == 0 ||
(u.field_set & (1 << UF_HOST)) == 0) {
ec = make_error_code(boost::system::errc::invalid_argument);
return nullptr;
}
auto strm = create_stream();
auto &req = strm->request().impl();
auto &uref = req.uri();
http2::copy_url_component(uref.scheme, &u, UF_SCHEMA, uri.c_str());
http2::copy_url_component(uref.host, &u, UF_HOST, uri.c_str());
http2::copy_url_component(uref.raw_path, &u, UF_PATH, uri.c_str());
http2::copy_url_component(uref.raw_query, &u, UF_QUERY, uri.c_str());
if (util::ipv6_numeric_addr(uref.host.c_str())) {
uref.host = "[" + uref.host;
uref.host += ']';
}
if (u.field_set & (1 << UF_PORT)) {
uref.host += ':';
uref.host += util::utos(u.port);
}
if (uref.raw_path.empty()) {
uref.raw_path = "/";
}
uref.path = percent_decode(uref.raw_path);
auto path = uref.raw_path;
if (u.field_set & (1 << UF_QUERY)) {
path += '?';
path += uref.raw_query;
}
auto nva = std::vector<nghttp2_nv>();
nva.reserve(3 + h.size());
nva.push_back(http2::make_nv_ls(":method", method));
nva.push_back(http2::make_nv_ls(":scheme", uref.scheme));
nva.push_back(http2::make_nv_ls(":path", path));
nva.push_back(http2::make_nv_ls(":authority", uref.host));
for (auto &kv : h) {
nva.push_back(
http2::make_nv(kv.first, kv.second.value, kv.second.sensitive));
}
req.header(std::move(h));
nghttp2_data_provider *prdptr = nullptr;
nghttp2_data_provider prd;
if (cb) {
strm->request().impl().on_read(std::move(cb));
prd.source.ptr = strm.get();
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->request().impl().call_on_read(buf, length, data_flags);
};
prdptr = &prd;
}
auto stream_id = nghttp2_submit_request(session_, nullptr, nva.data(),
nva.size(), prdptr, strm.get());
if (stream_id < 0) {
ec = make_error_code(static_cast<nghttp2_error>(stream_id));
return nullptr;
}
signal_write();
strm->stream_id(stream_id);
auto p = streams_.emplace(stream_id, std::move(strm));
assert(p.second);
return &(*p.first).second->request();
}
void session_impl::shutdown() {
if (stopped_) {
return;
}
nghttp2_session_terminate_session(session_, NGHTTP2_NO_ERROR);
signal_write();
}
boost::asio::io_service &session_impl::io_service() { return io_service_; }
void session_impl::signal_write() {
if (!inside_callback_) {
do_write();
}
}
bool session_impl::should_stop() const {
return !writing_ && !nghttp2_session_want_read(session_) &&
!nghttp2_session_want_write(session_);
}
namespace {
struct callback_guard {
callback_guard(session_impl &sess) : sess(sess) { sess.enter_callback(); }
~callback_guard() { sess.leave_callback(); }
session_impl &sess;
};
} // namespace
void session_impl::enter_callback() {
assert(!inside_callback_);
inside_callback_ = true;
}
void session_impl::leave_callback() {
assert(inside_callback_);
inside_callback_ = false;
}
void session_impl::do_read() {
if (stopped_) {
return;
}
deadline_.expires_from_now(read_timeout_);
auto self = this->shared_from_this();
read_socket([this, self](const boost::system::error_code &ec,
std::size_t bytes_transferred) {
if (ec) {
if (!should_stop()) {
call_error_cb(ec);
}
stop();
return;
}
{
callback_guard cg(*this);
auto rv =
nghttp2_session_mem_recv(session_, rb_.data(), bytes_transferred);
if (rv != static_cast<ssize_t>(bytes_transferred)) {
call_error_cb(make_error_code(
static_cast<nghttp2_error>(rv < 0 ? rv : NGHTTP2_ERR_PROTO)));
stop();
return;
}
}
do_write();
if (should_stop()) {
stop();
return;
}
do_read();
});
}
void session_impl::do_write() {
if (stopped_) {
return;
}
if (writing_) {
return;
}
if (data_pending_) {
std::copy_n(data_pending_, data_pendinglen_, std::begin(wb_) + wblen_);
wblen_ += data_pendinglen_;
data_pending_ = nullptr;
data_pendinglen_ = 0;
}
{
callback_guard cg(*this);
for (;;) {
const uint8_t *data;
auto n = nghttp2_session_mem_send(session_, &data);
if (n < 0) {
call_error_cb(make_error_code(static_cast<nghttp2_error>(n)));
stop();
return;
}
if (n == 0) {
break;
}
if (wblen_ + n > wb_.size()) {
data_pending_ = data;
data_pendinglen_ = n;
break;
}
std::copy_n(data, n, std::begin(wb_) + wblen_);
wblen_ += n;
}
}
if (wblen_ == 0) {
if (should_stop()) {
stop();
}
return;
}
writing_ = true;
// Reset read deadline here, because normally client is sending
// something, it does not expect timeout while doing it.
deadline_.expires_from_now(read_timeout_);
auto self = this->shared_from_this();
write_socket(
[this, self](const boost::system::error_code &ec, std::size_t n) {
if (ec) {
call_error_cb(ec);
stop();
return;
}
wblen_ = 0;
writing_ = false;
do_write();
});
}
void session_impl::stop() {
if (stopped_) {
return;
}
shutdown_socket();
deadline_.cancel();
stopped_ = true;
}
bool session_impl::stopped() const { return stopped_; }
void session_impl::read_timeout(const boost::posix_time::time_duration &t) {
read_timeout_ = t;
}
} // namespace client
} // namespace asio_http2
} // nghttp2
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