tdlight/tdnet/td/net/HttpConnectionBase.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/net/HttpConnectionBase.h"
#include "td/net/HttpHeaderCreator.h"
#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/port/detail/PollableFd.h"
namespace td {
namespace detail {
HttpConnectionBase::HttpConnectionBase(State state, SocketFd fd, SslStream ssl_stream, size_t max_post_size,
size_t max_files, int32 idle_timeout, int32 slow_scheduler_id)
: state_(state)
, fd_(std::move(fd))
, ssl_stream_(std::move(ssl_stream))
, max_post_size_(max_post_size)
, max_files_(max_files)
, idle_timeout_(idle_timeout)
, slow_scheduler_id_(slow_scheduler_id) {
CHECK(state_ != State::Close);
if (ssl_stream_) {
read_source_ >> ssl_stream_.read_byte_flow() >> read_sink_;
write_source_ >> ssl_stream_.write_byte_flow() >> write_sink_;
} else {
read_source_ >> read_sink_;
write_source_ >> write_sink_;
}
peer_address_.init_peer_address(fd_).ignore();
}
void HttpConnectionBase::live_event() {
if (idle_timeout_ != 0) {
set_timeout_in(idle_timeout_);
}
}
void HttpConnectionBase::start_up() {
Scheduler::subscribe(fd_.get_poll_info().extract_pollable_fd(this));
reader_.init(read_sink_.get_output(), max_post_size_, max_files_);
if (state_ == State::Read) {
current_query_ = make_unique<HttpQuery>();
}
live_event();
yield();
}
void HttpConnectionBase::tear_down() {
Scheduler::unsubscribe_before_close(fd_.get_poll_info().get_pollable_fd_ref());
fd_.close();
}
void HttpConnectionBase::write_next_noflush(BufferSlice buffer) {
CHECK(state_ == State::Write);
write_buffer_.append(std::move(buffer));
}
void HttpConnectionBase::write_next(BufferSlice buffer) {
write_next_noflush(std::move(buffer));
loop();
}
void HttpConnectionBase::write_ok() {
CHECK(state_ == State::Write);
current_query_ = make_unique<HttpQuery>();
state_ = State::Read;
live_event();
loop();
}
void HttpConnectionBase::write_error(Status error) {
CHECK(state_ == State::Write);
LOG(WARNING) << "Close HTTP connection: " << error;
state_ = State::Close;
loop();
}
void HttpConnectionBase::timeout_expired() {
LOG(INFO) << "Idle timeout expired";
if (fd_.need_flush_write()) {
on_error(Status::Error("Write timeout expired"));
} else if (state_ == State::Read) {
on_error(Status::Error("Read timeout expired"));
}
stop();
}
void HttpConnectionBase::loop() {
if (ssl_stream_) {
//ssl_stream_.read_byte_flow().set_need_size(0);
ssl_stream_.write_byte_flow().reset_need_size();
}
sync_with_poll(fd_);
if (can_read_local(fd_)) {
LOG(DEBUG) << "Can read from the connection";
auto r = fd_.flush_read();
if (r.is_error()) {
if (!begins_with(r.error().message(), "SSL error {336134278")) { // if error is not yet outputed
LOG(INFO) << "Receive flush_read error: " << r.error();
}
on_error(Status::Error(r.error().public_message()));
return stop();
}
}
read_source_.wakeup();
// TODO: read_next even when state_ == State::Write
bool want_read = false;
bool can_be_slow = slow_scheduler_id_ == -1;
if (state_ == State::Read) {
auto res = reader_.read_next(current_query_.get(), can_be_slow);
if (res.is_error()) {
if (res.error().message() == "SLOW") {
LOG(INFO) << "Slow HTTP connection: migrate to " << slow_scheduler_id_;
CHECK(!can_be_slow);
yield();
migrate(slow_scheduler_id_);
slow_scheduler_id_ = -1;
return;
}
live_event();
state_ = State::Write;
LOG(INFO) << res.error();
HttpHeaderCreator hc;
hc.init_status_line(res.error().code());
hc.set_content_size(0);
write_buffer_.append(hc.finish().ok());
close_after_write_ = true;
on_error(Status::Error(res.error().public_message()));
} else if (res.ok() == 0) {
state_ = State::Write;
LOG(DEBUG) << "Send query to handler";
live_event();
current_query_->peer_address_ = peer_address_;
on_query(std::move(current_query_));
} else {
want_read = true;
}
}
write_source_.wakeup();
if (can_write_local(fd_)) {
LOG(DEBUG) << "Can write to the connection";
auto r = fd_.flush_write();
if (r.is_error()) {
LOG(INFO) << "Receive flush_write error: " << r.error();
on_error(Status::Error(r.error().public_message()));
}
if (close_after_write_ && !fd_.need_flush_write()) {
return stop();
}
}
Status pending_error;
if (fd_.get_poll_info().get_flags_local().has_pending_error()) {
pending_error = fd_.get_pending_error();
}
if (pending_error.is_ok() && write_sink_.status().is_error()) {
pending_error = std::move(write_sink_.status());
}
if (pending_error.is_ok() && read_sink_.status().is_error()) {
pending_error = std::move(read_sink_.status());
}
if (pending_error.is_error()) {
LOG(INFO) << pending_error;
if (!close_after_write_) {
on_error(Status::Error(pending_error.public_message()));
}
state_ = State::Close;
}
if (can_close_local(fd_)) {
LOG(DEBUG) << "Can close the connection";
state_ = State::Close;
}
if (state_ == State::Close) {
LOG_IF(INFO, fd_.need_flush_write()) << "Close nonempty connection";
LOG_IF(INFO, want_read && (fd_.input_buffer().size() > 0 || current_query_->type_ != HttpQuery::Type::Empty))
<< "Close connection while reading request/response";
return stop();
}
}
} // namespace detail
} // namespace td