155 lines
3.8 KiB
C++
155 lines
3.8 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/actor/actor.h"
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#include "td/actor/PromiseFuture.h"
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#include "td/telegram/AuthManager.h"
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#include "td/telegram/Td.h"
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#include "td/telegram/td_api.h"
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#include "td/utils/common.h"
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#include "td/utils/logging.h"
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#include "td/utils/Status.h"
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#include <type_traits>
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namespace td {
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template <class T = Unit>
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class RequestActor : public Actor {
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public:
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RequestActor(ActorShared<Td> td_id, uint64 request_id)
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: td_id_(std::move(td_id)), td(td_id_.get().get_actor_unsafe()), request_id_(request_id) {
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}
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void loop() override {
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PromiseActor<T> promise;
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FutureActor<T> future;
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init_promise_future(&promise, &future);
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do_run(PromiseCreator::from_promise_actor(std::move(promise)));
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if (future.is_ready()) {
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if (future.is_error()) {
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do_send_error(future.move_as_error());
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} else {
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do_set_result(future.move_as_ok());
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do_send_result();
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}
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stop();
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} else {
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if (--tries_left_ == 0) {
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future.close();
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do_send_error(Status::Error(400, "Requested data is inaccessible"));
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return stop();
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}
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future.set_event(EventCreator::raw(actor_id(), nullptr));
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future_ = std::move(future);
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}
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}
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void raw_event(const Event::Raw &event) override {
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if (future_.is_error()) {
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auto error = future_.move_as_error();
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if (error == Status::Error<FutureActor<T>::Hangup>()) {
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// dropping query due to lost authorization or lost promise
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// td may be already closed, so we should check is auth_manager_ is empty
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bool is_authorized = td->auth_manager_ && td->auth_manager_->is_authorized();
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if (is_authorized) {
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LOG(ERROR) << "Promise was lost";
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do_send_error(Status::Error(500, "Query can't be answered due to bug in the TDLib"));
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} else {
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do_send_error(Status::Error(401, "Unauthorized"));
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}
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return stop();
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}
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do_send_error(std::move(error));
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stop();
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} else {
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do_set_result(future_.move_as_ok());
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loop();
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}
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}
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void on_start_migrate(int32 /*sched_id*/) override {
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UNREACHABLE();
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}
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void on_finish_migrate() override {
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UNREACHABLE();
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}
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int get_tries() const {
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return tries_left_;
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}
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void set_tries(int32 tries) {
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tries_left_ = tries;
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}
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protected:
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ActorShared<Td> td_id_;
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Td *td;
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void send_result(tl_object_ptr<td_api::Object> &&result) {
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send_closure(td_id_, &Td::send_result, request_id_, std::move(result));
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}
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void send_error(Status &&status) {
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LOG(INFO) << "Receive error for query: " << status;
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send_closure(td_id_, &Td::send_error, request_id_, std::move(status));
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}
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private:
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virtual void do_run(Promise<T> &&promise) = 0;
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virtual void do_send_result() {
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send_result(make_tl_object<td_api::ok>());
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}
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virtual void do_send_error(Status &&status) {
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send_error(std::move(status));
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}
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virtual void do_set_result(T &&result) {
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CHECK((std::is_same<T, Unit>::value)); // all other results should be implicitly handled by overriding this method
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}
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void hangup() override {
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do_send_error(Status::Error(500, "Request aborted"));
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stop();
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}
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friend class RequestOnceActor;
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uint64 request_id_;
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int tries_left_ = 2;
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FutureActor<T> future_;
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};
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class RequestOnceActor : public RequestActor<> {
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public:
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RequestOnceActor(ActorShared<Td> td_id, uint64 request_id) : RequestActor(std::move(td_id), request_id) {
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}
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void loop() override {
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if (get_tries() < 2) {
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do_send_result();
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stop();
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return;
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}
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RequestActor::loop();
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}
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};
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} // namespace td
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