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133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file http.h Shared functions for implementations of HTTP requests.
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*/
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#ifndef NETWORK_CORE_HTTP_SHARED_H
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#define NETWORK_CORE_HTTP_SHARED_H
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#include "http.h"
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#include <condition_variable>
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#include <mutex>
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#include <vector>
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/** Converts a HTTPCallback to a Thread-Safe variant. */
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class HTTPThreadSafeCallback {
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private:
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/** Entries on the queue for later handling. */
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class Callback {
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public:
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Callback(UniqueBuffer<char> data) : data(std::move(data)), failure(false) {}
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Callback() : data({}), failure(true) {}
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UniqueBuffer<char> data;
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bool failure;
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};
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public:
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/**
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* Similar to HTTPCallback::OnFailure, but thread-safe.
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*/
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void OnFailure()
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{
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std::lock_guard<std::mutex> lock(this->mutex);
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this->queue.emplace_back();
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}
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/**
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* Similar to HTTPCallback::OnReceiveData, but thread-safe.
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*/
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void OnReceiveData(UniqueBuffer<char> data)
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{
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std::lock_guard<std::mutex> lock(this->mutex);
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this->queue.emplace_back(std::move(data));
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}
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/**
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* Process everything on the queue.
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*
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* Should be called from the Game Thread.
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*/
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void HandleQueue()
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{
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this->cancelled = callback->IsCancelled();
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std::lock_guard<std::mutex> lock(this->mutex);
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for (auto &item : this->queue) {
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if (item.failure) {
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this->callback->OnFailure();
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} else {
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this->callback->OnReceiveData(std::move(item.data));
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}
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}
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this->queue.clear();
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this->queue_cv.notify_all();
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}
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/**
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* Wait till the queue is dequeued, or a condition is met.
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* @param condition Condition functor.
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*/
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template <typename T>
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void WaitTillEmptyOrCondition(T condition)
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{
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std::unique_lock<std::mutex> lock(this->mutex);
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while (!(queue.empty() || condition())) {
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this->queue_cv.wait(lock);
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}
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}
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/**
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* Check if the queue is empty.
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*/
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bool IsQueueEmpty()
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{
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std::lock_guard<std::mutex> lock(this->mutex);
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return this->queue.empty();
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}
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/**
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* Clear everything in the queue.
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*
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* Should be called from the Game Thread.
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*/
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void ClearQueue()
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{
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std::lock_guard<std::mutex> lock(this->mutex);
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this->queue.clear();
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this->queue_cv.notify_all();
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}
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HTTPThreadSafeCallback(HTTPCallback *callback) : callback(callback) {}
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~HTTPThreadSafeCallback()
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{
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std::lock_guard<std::mutex> lock(this->mutex);
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queue.clear();
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queue_cv.notify_all();
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}
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std::atomic<bool> cancelled = false;
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private:
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HTTPCallback *callback; ///< The callback to send data back on.
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std::mutex mutex; ///< Mutex to protect the queue.
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std::vector<Callback> queue; ///< Queue of data to send back.
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std::condition_variable queue_cv; ///< Condition variable to wait for the queue to be empty.
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};
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#endif /* NETWORK_CORE_HTTP_SHARED_H */
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