tdesktop/Telegram/SourceFiles/mtproto/config_loader.cpp at dev · feiyunwill/tdesktop · GitHub

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This file is part of Telegram Desktop,

the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:

https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL

#include "mtproto/config_loader.h"

#include "base/random.h"

#include "mtproto/special_config_request.h"

#include "mtproto/facade.h"

#include "mtproto/mtproto_dc_options.h"

#include "mtproto/mtproto_config.h"

#include "mtproto/mtp_instance.h"

namespace MTP {

namespace details {

namespace {

constexpr auto kEnumerateDcTimeout = 8000; // 8 seconds timeout for help_getConfig to work (then move to other dc)

constexpr auto kSpecialRequestTimeoutMs = 6000; // 4 seconds timeout for it to work in a specially requested dc.

} // namespace

ConfigLoader::ConfigLoader(

not_null<Instance*> instance,

const QString &phone,

Fn<void(const MTPConfig &result)> onDone,

FailHandler onFail,

bool proxyEnabled)

: _instance(instance)

, _phone(phone)

, _proxyEnabled(proxyEnabled)

, _doneHandler(onDone)

, _failHandler(onFail) {

_enumDCTimer.setCallback([this] { enumerate(); });

_specialEnumTimer.setCallback([this] { sendSpecialRequest(); });

}

void ConfigLoader::load() {

if (!_instance->isKeysDestroyer()) {

sendRequest(_instance->mainDcId());

_enumDCTimer.callOnce(kEnumerateDcTimeout);

} else {

auto ids = _instance->dcOptions().configEnumDcIds();

Assert(!ids.empty());

_enumCurrent = ids.front();

enumerate();

}

mtpRequestId ConfigLoader::sendRequest(ShiftedDcId shiftedDcId) {

auto done = [done = _doneHandler](const Response &response) {

auto from = response.reply.constData();

auto result = MTPConfig();

if (!result.read(from, from + response.reply.size())) {

return false;

}

done(result);

return true;

};

return _instance->send(

MTPhelp_GetConfig(),

std::move(done),

base::duplicate(_failHandler),

shiftedDcId);

}

DcId ConfigLoader::specialToRealDcId(DcId specialDcId) {

return getTemporaryIdFromRealDcId(specialDcId);

}

void ConfigLoader::terminateRequest() {

if (_enumRequest) {

_instance->cancel(base::take(_enumRequest));

}

if (_enumCurrent) {

_instance->killSession(MTP::configDcId(_enumCurrent));

}

void ConfigLoader::terminateSpecialRequest() {

if (_specialEnumRequest) {

_instance->cancel(base::take(_specialEnumRequest));

}

if (_specialEnumCurrent) {

_instance->killSession(_specialEnumCurrent);

}

ConfigLoader::~ConfigLoader() {

terminateRequest();

terminateSpecialRequest();

}

void ConfigLoader::enumerate() {

terminateRequest();

if (!_enumCurrent) {

_enumCurrent = _instance->mainDcId();

}

auto ids = _instance->dcOptions().configEnumDcIds();

Assert(!ids.empty());

auto i = std::find(ids.cbegin(), ids.cend(), _enumCurrent);

if (i == ids.cend() || (++i) == ids.cend()) {

_enumCurrent = ids.front();

} else {

_enumCurrent = *i;

}

_enumRequest = sendRequest(MTP::configDcId(_enumCurrent));

_enumDCTimer.callOnce(kEnumerateDcTimeout);

refreshSpecialLoader();

}

void ConfigLoader::refreshSpecialLoader() {

if (_proxyEnabled || _instance->isKeysDestroyer()) {

_specialLoader.reset();

return;

}

if (!_specialLoader

|| (!_specialEnumRequest && _specialEndpoints.empty())) {

createSpecialLoader();

}

void ConfigLoader::setPhone(const QString &phone) {

if (_phone != phone) {

_phone = phone;

if (_specialLoader) {

createSpecialLoader();

}

void ConfigLoader::createSpecialLoader() {

const auto testMode = _instance->isTestMode();

_triedSpecialEndpoints.clear();

_specialLoader = std::make_unique<SpecialConfigRequest>([=](

DcId dcId,

const std::string &ip,

int port,

bytes::const_span secret) {

if (ip.empty()) {

_specialLoader = nullptr;

} else {

addSpecialEndpoint(dcId, ip, port, secret);

}

}, testMode, _instance->configValues().txtDomainString, _phone);

}

void ConfigLoader::addSpecialEndpoint(

DcId dcId,

const std::string &ip,

int port,

bytes::const_span secret) {

const auto endpoint = SpecialEndpoint {

dcId,

ip,

port,

bytes::make_vector(secret)

};

if (base::contains(_specialEndpoints, endpoint)

|| base::contains(_triedSpecialEndpoints, endpoint)) {

return;

}

DEBUG_LOG(("MTP Info: Special endpoint received, '%1:%2'").arg(ip.c_str()).arg(port));

_specialEndpoints.push_back(endpoint);

if (!_specialEnumTimer.isActive()) {

_specialEnumTimer.callOnce(1);

}

void ConfigLoader::sendSpecialRequest() {

terminateSpecialRequest();

if (_proxyEnabled) {

_specialLoader.reset();

return;

}

if (_specialEndpoints.empty()) {

refreshSpecialLoader();

return;

}

const auto weak = base::make_weak(this);

const auto index = base::RandomValue<uint32>() % _specialEndpoints.size();

const auto endpoint = _specialEndpoints.begin() + index;

_specialEnumCurrent = specialToRealDcId(endpoint->dcId);

using Flag = MTPDdcOption::Flag;

const auto flags = Flag::f_tcpo_only

| (endpoint->secret.empty() ? Flag(0) : Flag::f_secret);

_instance->dcOptions().constructAddOne(

_specialEnumCurrent,

flags,

endpoint->ip,

endpoint->port,

endpoint->secret);

_specialEnumRequest = _instance->send(

MTPhelp_GetConfig(),

[weak](const Response &response) {

auto result = MTPConfig();

auto from = response.reply.constData();

if (!result.read(from, from + response.reply.size())) {

return false;

}

if (const auto strong = weak.get()) {

strong->specialConfigLoaded(result);

}

return true;

base::duplicate(_failHandler),

_specialEnumCurrent);

_triedSpecialEndpoints.push_back(*endpoint);

_specialEndpoints.erase(endpoint);

_specialEnumTimer.callOnce(kSpecialRequestTimeoutMs);

}

void ConfigLoader::specialConfigLoaded(const MTPConfig &result) {

Expects(result.type() == mtpc_config);

const auto &data = result.c_config();

if (data.vdc_options().v.empty()) {

LOG(("MTP Error: config with empty dc_options received!"));

return;

}

// We use special config only for dc options.

// For everything else we wait for normal config from main dc.

_instance->dcOptions().setFromList(data.vdc_options());

}

void ConfigLoader::setProxyEnabled(bool value) {

_proxyEnabled = value;

}

} // namespace details

} // namespace MTP

tdesktop/Telegram/SourceFiles/mtproto/config_loader.cpp at dev · feiyunwill/tdesktop · GitHub

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