tdesktop/Telegram/SourceFiles/mtproto/sender.h

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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
*/
#pragma once
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#include "base/variant.h"
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#include "mtproto/mtproto_response.h"
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#include "mtproto/mtp_instance.h"
#include "mtproto/facade.h"
namespace MTP {
class Sender {
class RequestBuilder {
public:
RequestBuilder(const RequestBuilder &other) = delete;
RequestBuilder &operator=(const RequestBuilder &other) = delete;
RequestBuilder &operator=(RequestBuilder &&other) = delete;
protected:
enum class FailSkipPolicy {
Simple,
HandleFlood,
HandleAll,
};
using FailPlainHandler = Fn<void()>;
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using FailErrorHandler = Fn<void(const Error&)>;
using FailRequestIdHandler = Fn<void(const Error&, mtpRequestId)>;
using FailFullHandler = Fn<void(const Error&, const Response&)>;
template <typename ...Args>
static constexpr bool IsCallable
= rpl::details::is_callable_plain_v<Args...>;
template <typename Result, typename Handler>
[[nodiscard]] DoneHandler MakeDoneHandler(
not_null<Sender*> sender,
Handler &&handler) {
return [sender, handler = std::forward<Handler>(handler)](
const Response &response) mutable {
auto onstack = std::move(handler);
sender->senderRequestHandled(response.requestId);
auto result = Result();
auto from = response.reply.constData();
if (!result.read(from, from + response.reply.size())) {
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return false;
} else if (!onstack) {
return true;
} else if constexpr (IsCallable<
Handler,
const Result&,
const Response&>) {
onstack(result, response);
} else if constexpr (IsCallable<
Handler,
const Result&,
mtpRequestId>) {
onstack(result, response.requestId);
} else if constexpr (IsCallable<
Handler,
const Result&>) {
onstack(result);
} else if constexpr (IsCallable<Handler>) {
onstack();
} else {
static_assert(false_t(Handler{}), "Bad done handler.");
}
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return true;
};
}
template <typename Handler>
[[nodiscard]] FailHandler MakeFailHandler(
not_null<Sender*> sender,
Handler &&handler,
FailSkipPolicy skipPolicy) {
return [
sender,
handler = std::forward<Handler>(handler),
skipPolicy
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](const Error &error, const Response &response) {
if (skipPolicy == FailSkipPolicy::Simple) {
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if (IsDefaultHandledError(error)) {
return false;
}
} else if (skipPolicy == FailSkipPolicy::HandleFlood) {
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if (IsDefaultHandledError(error) && !IsFloodError(error)) {
return false;
}
}
auto onstack = handler;
sender->senderRequestHandled(response.requestId);
if (!onstack) {
return true;
} else if constexpr (IsCallable<
Handler,
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const Error&,
const Response&>) {
onstack(error, response);
} else if constexpr (IsCallable<
Handler,
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const Error&,
mtpRequestId>) {
onstack(error, response.requestId);
} else if constexpr (IsCallable<
Handler,
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const Error&>) {
onstack(error);
} else if constexpr (IsCallable<Handler>) {
onstack();
} else {
static_assert(false_t(Handler{}), "Bad fail handler.");
}
return true;
};
}
explicit RequestBuilder(not_null<Sender*> sender) noexcept
: _sender(sender) {
}
RequestBuilder(RequestBuilder &&other) = default;
void setToDC(ShiftedDcId dcId) noexcept {
_dcId = dcId;
}
void setCanWait(crl::time ms) noexcept {
_canWait = ms;
}
void setDoneHandler(DoneHandler &&handler) noexcept {
_done = std::move(handler);
}
template <typename Handler>
void setFailHandler(Handler &&handler) noexcept {
_fail = std::forward<Handler>(handler);
}
void setFailSkipPolicy(FailSkipPolicy policy) noexcept {
_failSkipPolicy = policy;
}
void setAfter(mtpRequestId requestId) noexcept {
_afterRequestId = requestId;
}
ShiftedDcId takeDcId() const noexcept {
return _dcId;
}
crl::time takeCanWait() const noexcept {
return _canWait;
}
DoneHandler takeOnDone() noexcept {
return std::move(_done);
}
FailHandler takeOnFail() {
return v::match(_fail, [&](auto &value) {
return MakeFailHandler(
_sender,
std::move(value),
_failSkipPolicy);
});
}
mtpRequestId takeAfter() const noexcept {
return _afterRequestId;
}
not_null<Sender*> sender() const noexcept {
return _sender;
}
void registerRequest(mtpRequestId requestId) {
_sender->senderRequestRegister(requestId);
}
private:
not_null<Sender*> _sender;
ShiftedDcId _dcId = 0;
crl::time _canWait = 0;
DoneHandler _done;
std::variant<
FailPlainHandler,
FailErrorHandler,
FailRequestIdHandler,
FailFullHandler> _fail;
FailSkipPolicy _failSkipPolicy = FailSkipPolicy::Simple;
mtpRequestId _afterRequestId = 0;
};
public:
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explicit Sender(not_null<Instance*> instance) noexcept
: _instance(instance) {
}
[[nodiscard]] Instance &instance() const {
return *_instance;
}
template <typename Request>
class SpecificRequestBuilder : public RequestBuilder {
private:
friend class Sender;
SpecificRequestBuilder(not_null<Sender*> sender, Request &&request) noexcept
: RequestBuilder(sender)
, _request(std::move(request)) {
}
SpecificRequestBuilder(SpecificRequestBuilder &&other) = default;
public:
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[[nodiscard]] SpecificRequestBuilder &toDC(ShiftedDcId dcId) noexcept {
setToDC(dcId);
return *this;
}
[[nodiscard]] SpecificRequestBuilder &afterDelay(crl::time ms) noexcept {
setCanWait(ms);
return *this;
}
using Result = typename Request::ResponseType;
[[nodiscard]] SpecificRequestBuilder &done(
FnMut<void(
const Result &result,
mtpRequestId requestId)> callback) {
setDoneHandler(
MakeDoneHandler<Result>(sender(), std::move(callback)));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &done(
FnMut<void(
const Result &result,
const Response &response)> callback) {
setDoneHandler(
MakeDoneHandler<Result>(sender(), std::move(callback)));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &done(
FnMut<void()> callback) {
setDoneHandler(
MakeDoneHandler<Result>(sender(), std::move(callback)));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &done(
FnMut<void(
const typename Request::ResponseType &result)> callback) {
setDoneHandler(
MakeDoneHandler<Result>(sender(), std::move(callback)));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &fail(
Fn<void(
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const Error &error,
mtpRequestId requestId)> callback) noexcept {
setFailHandler(std::move(callback));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &fail(
Fn<void(
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const Error &error,
const Response &response)> callback) noexcept {
setFailHandler(std::move(callback));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &fail(
Fn<void()> callback) noexcept {
setFailHandler(std::move(callback));
return *this;
}
[[nodiscard]] SpecificRequestBuilder &fail(
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Fn<void(const Error &error)> callback) noexcept {
setFailHandler(std::move(callback));
return *this;
}
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[[nodiscard]] SpecificRequestBuilder &handleFloodErrors() noexcept {
setFailSkipPolicy(FailSkipPolicy::HandleFlood);
return *this;
}
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[[nodiscard]] SpecificRequestBuilder &handleAllErrors() noexcept {
setFailSkipPolicy(FailSkipPolicy::HandleAll);
return *this;
}
[[nodiscard]] SpecificRequestBuilder &afterRequest(mtpRequestId requestId) noexcept {
setAfter(requestId);
return *this;
}
mtpRequestId send() {
const auto id = sender()->_instance->send(
_request,
takeOnDone(),
takeOnFail(),
takeDcId(),
takeCanWait(),
takeAfter());
registerRequest(id);
return id;
}
private:
Request _request;
};
class SentRequestWrap {
private:
friend class Sender;
SentRequestWrap(not_null<Sender*> sender, mtpRequestId requestId) : _sender(sender), _requestId(requestId) {
}
public:
void cancel() {
if (_requestId) {
_sender->senderRequestCancel(_requestId);
}
}
private:
not_null<Sender*> _sender;
mtpRequestId _requestId = 0;
};
template <
typename Request,
typename = std::enable_if_t<!std::is_reference_v<Request>>,
typename = typename Request::Unboxed>
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[[nodiscard]] SpecificRequestBuilder<Request> request(Request &&request) noexcept;
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[[nodiscard]] SentRequestWrap request(mtpRequestId requestId) noexcept;
[[nodiscard]] auto requestCanceller() noexcept {
return [this](mtpRequestId requestId) {
request(requestId).cancel();
};
}
void requestSendDelayed() {
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_instance->sendAnything();
}
void requestCancellingDiscard() {
for (auto &request : base::take(_requests)) {
request.handled();
}
}
private:
class RequestWrap {
public:
RequestWrap(
not_null<Instance*> instance,
mtpRequestId requestId) noexcept
: _instance(instance)
, _id(requestId) {
}
RequestWrap(const RequestWrap &other) = delete;
RequestWrap &operator=(const RequestWrap &other) = delete;
RequestWrap(RequestWrap &&other)
: _instance(other._instance)
, _id(base::take(other._id)) {
}
RequestWrap &operator=(RequestWrap &&other) {
Expects(_instance == other._instance);
if (_id != other._id) {
cancelRequest();
_id = base::take(other._id);
}
return *this;
}
mtpRequestId id() const noexcept {
return _id;
}
void handled() const noexcept {
_id = 0;
}
~RequestWrap() {
cancelRequest();
}
private:
void cancelRequest() {
if (_id) {
_instance->cancel(_id);
}
}
const not_null<Instance*> _instance;
mutable mtpRequestId _id = 0;
};
struct RequestWrapComparator {
using is_transparent = std::true_type;
struct helper {
mtpRequestId requestId = 0;
helper() = default;
helper(const helper &other) = default;
helper(mtpRequestId requestId) noexcept : requestId(requestId) {
}
helper(const RequestWrap &request) noexcept : requestId(request.id()) {
}
bool operator<(helper other) const {
return requestId < other.requestId;
}
};
bool operator()(const helper &&lhs, const helper &&rhs) const {
return lhs < rhs;
}
};
template <typename Request>
friend class SpecificRequestBuilder;
friend class RequestBuilder;
friend class RequestWrap;
friend class SentRequestWrap;
void senderRequestRegister(mtpRequestId requestId) {
_requests.emplace(_instance, requestId);
}
void senderRequestHandled(mtpRequestId requestId) {
auto it = _requests.find(requestId);
if (it != _requests.cend()) {
it->handled();
_requests.erase(it);
}
}
void senderRequestCancel(mtpRequestId requestId) {
auto it = _requests.find(requestId);
if (it != _requests.cend()) {
_requests.erase(it);
}
}
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const not_null<Instance*> _instance;
base::flat_set<RequestWrap, RequestWrapComparator> _requests;
};
template <typename Request, typename, typename>
Sender::SpecificRequestBuilder<Request> Sender::request(Request &&request) noexcept {
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return SpecificRequestBuilder<Request>(this, std::move(request));
}
inline Sender::SentRequestWrap Sender::request(mtpRequestId requestId) noexcept {
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return SentRequestWrap(this, requestId);
}
} // namespace MTP