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77 lines
2.7 KiB
77 lines
2.7 KiB
// SPDX-License-Identifier: BSD-3-Clause
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// Copyright (c) 2020-2021, The Monero Project.
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#ifndef WOWLET_RESTOREHEIGHTLOOKUP_H
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#define WOWLET_RESTOREHEIGHTLOOKUP_H
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#include <cstdio>
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#include <cstdlib>
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#include <wownero_seed/wownero_seed.hpp>
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#include "networktype.h"
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#include "utils/utils.h"
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struct RestoreHeightLookup {
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NetworkType::Type type;
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QMap<int, int> data;
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explicit RestoreHeightLookup(NetworkType::Type type) : type(type) {}
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int dateToRestoreHeight(int date) {
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// restore height based on a given timestamp using a lookup
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// table. If it cannot find the date in the lookup table, it
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// will calculate the blockheight based off the last known
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// date: ((now - lastKnownDate) / blockTime) - clearance
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if(this->type == NetworkType::TESTNET) return 1;
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int blockTime = 300;
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int blocksPerDay = 288;
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int blockCalcClearance = blocksPerDay * 5;
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QList<int> values = this->data.keys();
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if(date <= values.at(0))
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return this->data[values.at(0)];
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for(int i = 0; i != values.count(); i++) {
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if(values[i] > date) {
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return i - 1 < 0 ? this->data[values[i]] : this->data[values[i-1]] - blockCalcClearance;
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}
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}
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// lookup failed, calculate blockheight from last known checkpoint
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int lastBlockHeightTime = values.at(values.count() - 1);
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int lastBlockHeight = this->data[lastBlockHeightTime];
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int deltaTime = date - lastBlockHeightTime;
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int deltaBlocks = deltaTime / blockTime;
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int blockHeight = (lastBlockHeight + deltaBlocks) - blockCalcClearance;
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qDebug() << "Calculated blockheight: " << blockHeight << " from epoch " << date;
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return blockHeight;
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}
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int restoreHeightToDate(int height) {
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// @TODO: most likely inefficient, refactor
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QMap<int, int>::iterator i;
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int timestamp = 0;
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for (i = this->data.begin(); i != this->data.end(); ++i) {
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int ts = i.key();
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if (i.value() > height)
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return timestamp;
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timestamp = ts;
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}
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return timestamp;
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}
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static RestoreHeightLookup *fromFile(const QString &fn, NetworkType::Type type) {
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// initialize this class using a lookup table, e.g `:/assets/restore_heights_monero_mainnet.txt`/
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auto rtn = new RestoreHeightLookup(type);
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auto data = Utils::barrayToString(Utils::fileOpen(fn));
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QMap<int, int> _data;
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for(const auto &line: data.split('\n')) {
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if(line.trimmed().isEmpty()) continue;
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auto spl = line.trimmed().split(':');
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rtn->data[spl.at(0).toUInt()] = spl.at(1).toUInt();
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}
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return rtn;
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}
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};
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#endif //WOWLET_RESTOREHEIGHTLOOKUP_H
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