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tdlib-fork/td/telegram/net/DcOptionsSet.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/telegram/net/DcOptionsSet.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include <algorithm>
#include <set>
#include <utility>
namespace td {
void DcOptionsSet::add_dc_options(DcOptions dc_options) {
std::vector<DcOptionId> new_ordered_options;
for (auto &option : dc_options.dc_options) {
auto *info = register_dc_option(std::move(option));
new_ordered_options.push_back(DcOptionId{info->pos});
}
std::set<DcOptionId> new_ordered_options_set(new_ordered_options.begin(), new_ordered_options.end());
for (auto option_id : ordered_options_) {
if (!new_ordered_options_set.count(option_id)) {
new_ordered_options.push_back(option_id);
}
}
ordered_options_ = std::move(new_ordered_options);
for (size_t i = 0; i < ordered_options_.size(); i++) {
options_[ordered_options_[i].pos]->order = i;
}
}
DcOptions DcOptionsSet::get_dc_options() const {
DcOptions result;
for (auto id : ordered_options_) {
result.dc_options.push_back(options_[id.pos]->option);
}
return result;
}
vector<DcOptionsSet::ConnectionInfo> DcOptionsSet::find_all_connections(DcId dc_id, bool allow_media_only,
bool use_static, bool prefer_ipv6,
bool only_http) {
std::vector<ConnectionInfo> options;
std::vector<ConnectionInfo> static_options;
if (prefer_ipv6) {
use_static = false;
}
for (auto &option_info : options_) {
auto &option = option_info->option;
if (option.get_dc_id() != dc_id) {
continue;
}
if (!option.is_valid()) {
LOG(INFO) << "Skip invalid DC option";
continue;
}
if (!allow_media_only && option.is_media_only()) {
LOG(DEBUG) << "Skip media only option";
continue;
}
ConnectionInfo info;
info.option = &option;
info.order = option_info->order;
OptionStat *option_stat = get_option_stat(option_info.get());
if (!only_http) {
info.use_http = false;
info.stat = &option_stat->tcp_stat;
if (option.is_static()) {
static_options.push_back(info);
} else {
options.push_back(info);
}
}
if (only_http) {
if (!option.is_obfuscated_tcp_only() && !option.is_static() && (prefer_ipv6 || !option.is_ipv6())) {
info.use_http = true;
info.stat = &option_stat->http_stat;
options.push_back(info);
}
}
}
if (use_static) {
if (!static_options.empty()) {
options = std::move(static_options);
} else {
bool have_ipv4 = std::any_of(options.begin(), options.end(), [](auto &v) { return !v.option->is_ipv6(); });
if (have_ipv4) {
options.erase(std::remove_if(options.begin(), options.end(), [](auto &v) { return v.option->is_ipv6(); }),
options.end());
}
}
} else {
if (options.empty()) {
options = std::move(static_options);
}
}
if (prefer_ipv6) {
bool have_ipv6 = std::any_of(options.begin(), options.end(), [](auto &v) { return v.option->is_ipv6(); });
if (have_ipv6) {
options.erase(std::remove_if(options.begin(), options.end(), [](auto &v) { return !v.option->is_ipv6(); }),
options.end());
}
}
bool have_media_only = std::any_of(options.begin(), options.end(), [](auto &v) { return v.option->is_media_only(); });
if (have_media_only) {
options.erase(std::remove_if(options.begin(), options.end(), [](auto &v) { return !v.option->is_media_only(); }),
options.end());
}
return options;
}
Result<DcOptionsSet::ConnectionInfo> DcOptionsSet::find_connection(DcId dc_id, bool allow_media_only, bool use_static,
bool prefer_ipv6, bool only_http) {
auto options = find_all_connections(dc_id, allow_media_only, use_static, prefer_ipv6, only_http);
if (options.empty()) {
return Status::Error(PSLICE() << "No such connection: " << tag("dc_id", dc_id)
<< tag("allow_media_only", allow_media_only) << tag("use_static", use_static)
<< tag("prefer_ipv6", prefer_ipv6));
}
auto last_error_at = std::min_element(options.begin(), options.end(),
[](const auto &a_option, const auto &b_option) {
return a_option.stat->error_at > b_option.stat->error_at;
})
->stat->error_at;
auto result = *std::min_element(options.begin(), options.end(), [](const auto &a_option, const auto &b_option) {
auto &a = *a_option.stat;
auto &b = *b_option.stat;
auto a_state = a.state();
auto b_state = b.state();
if (a_state != b_state) {
return a_state < b_state;
}
if (a_state == Stat::State::Ok) {
if (a_option.order == b_option.order) {
return a_option.use_http < b_option.use_http;
}
return a_option.order < b_option.order;
} else if (a_state == Stat::State::Error) {
return a.error_at < b.error_at;
}
return a_option.order < b_option.order;
});
result.should_check = !result.stat->is_ok() || result.use_http || last_error_at > Time::now_cached() - 10;
return result;
}
void DcOptionsSet::reset() {
options_.clear();
ordered_options_.clear();
}
DcOptionsSet::DcOptionInfo *DcOptionsSet::register_dc_option(DcOption &&option) {
auto info = std::make_unique<DcOptionInfo>(std::move(option), options_.size());
init_option_stat(info.get());
auto result = info.get();
options_.push_back(std::move(info));
return result;
}
void DcOptionsSet::init_option_stat(DcOptionInfo *option_info) {
const auto &ip_address = option_info->option.get_ip_address();
auto it_ok = option_to_stat_id_.insert(std::make_pair(ip_address, 0));
if (it_ok.second) {
it_ok.first->second = option_stats_.create(std::make_unique<OptionStat>());
}
option_info->stat_id = it_ok.first->second;
}
DcOptionsSet::OptionStat *DcOptionsSet::get_option_stat(const DcOptionInfo *option_info) {
return option_stats_.get(option_info->stat_id)->get();
}
} // namespace td