102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (C) 2022 Tom Zander <tom@flowee.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PRICEHISTORYDATAPROVIDER_H
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#define PRICEHISTORYDATAPROVIDER_H
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#include <QDateTime>
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#include <QFile>
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#include <QNetworkAccessManager>
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#include <QObject>
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#include <streaming/ConstBuffer.h>
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#include <boost/filesystem.hpp>
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class PriceHistoryDataProvider : public QObject
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{
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Q_OBJECT
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public:
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explicit PriceHistoryDataProvider(const QString &basedir, const QString ¤cy, QObject *parent = nullptr);
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void addPrice(const QString ¤cy, uint32_t timestamp, int price);
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Q_INVOKABLE int historicalPrice(const QDateTime ×tamp) const {
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return historicalPrice(timestamp.toTime_t());
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}
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int historicalPrice(uint32_t timestamp) const;
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QString currencyName() const;
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void setCurrency(const QString &newCurrency);
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/**
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* Adding values may trigger the 'processLog' method
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* automatically unless this value is set to false.
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* Default is true.
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*/
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void setAllowLogCompression(bool newAllowLogCompression);
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bool allowLogCompression() const;
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/// if there is no historical data, try to populate it
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void initialPopulate();
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public slots:
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void processLog();
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private:
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QString m_currency;
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struct Currency {
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// a single currency and historical things we know about it.
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QString id; ///< the language ID (EUR/USD etc)
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Streaming::ConstBuffer valueBlob; // a raw list of time/value pairs.
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/// a append-only list of time/value pairs (as stored in the log file)
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std::vector<std::pair<uint32_t, int> > logValues;
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/// the log file where we append newly queries currency values
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QFile *log = nullptr;
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};
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const Currency *currencyData(const QString &name) const;
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enum AutoCreate {
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FetchOnly,
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FetchOrCreate
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};
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Currency *currencyData(const QString &name, AutoCreate autoCreate);
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std::vector<Currency> m_currencies;
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QString m_basedir;
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bool m_allowLogCompression = true;
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};
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class InitialHistoryFetcher : public QObject
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{
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Q_OBJECT
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public:
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explicit InitialHistoryFetcher(QObject *parent = nullptr);
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void fetch(const QString &path, const QString ¤cy);
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signals:
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void success(const QString ¤cy);
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private:
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QNetworkAccessManager m_network;
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};
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#endif
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