332 lines
10 KiB
C++
332 lines
10 KiB
C++
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#include <iostream>
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#include <vector>
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#include <string>
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#include <algorithm>
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#include <map>
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#include <iomanip>
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#include <fstream>
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#include <cctype>
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#include "json.hpp"
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using namespace std;
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using json = nlohmann::json;
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struct Transaction {
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string from;
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string to;
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double value;
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};
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struct Block {
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int index;
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string hash;
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int64_t timestamp;
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string miner;
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double reward;
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vector<Transaction> transactions;
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string secret_info;
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int nonce;
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};
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vector<Block> blocks;
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bool loadBlocksFromFile(const string& filename) {
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ifstream input_file(filename);
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if (!input_file.is_open()) {
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cerr << "Error: Cannot open file " << filename << endl; //Ошибка: не удалось открыть файл
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return false;
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}
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try {
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json j;
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input_file >> j;
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blocks.clear();
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for (const auto& item : j) {
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Block block;
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block.index = item["index"];
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block.hash = item["hash"];
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block.timestamp = item["timestamp"];
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block.miner = item["miner"];
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block.reward = item["reward"];
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block.secret_info = item.value("secret_info", "");
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block.nonce = item["nonce"];
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for (const auto& tx_item : item["transactions"]) {
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Transaction tx;
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tx.from = tx_item["from"];
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tx.to = tx_item["to"];
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tx.value = tx_item["value"];
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block.transactions.push_back(tx);
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}
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blocks.push_back(block);
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}
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//Успешно загружено //блоков из файла
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cout << "Successfully loaded " << blocks.size() << " blocks from " << filename << endl;
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return true;
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}
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catch (const exception& e) {
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cerr << "JSON parsing error: " << e.what() << endl; //Ошибка при чтении JSON:
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return false;
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}
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}
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bool saveBlocksToFile(const string& filename) {
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json j;
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for (const auto& block : blocks) {
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json block_json;
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block_json["index"] = block.index;
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block_json["hash"] = block.hash;
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block_json["timestamp"] = block.timestamp;
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block_json["miner"] = block.miner;
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block_json["reward"] = block.reward;
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block_json["secret_info"] = block.secret_info;
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block_json["nonce"] = block.nonce;
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for (const auto& tx : block.transactions) {
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json tx_json;
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tx_json["from"] = tx.from;
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tx_json["to"] = tx.to;
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tx_json["value"] = tx.value;
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block_json["transactions"].push_back(tx_json);
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}
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j.push_back(block_json);
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}
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ofstream output_file(filename);
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if (!output_file.is_open()) {
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cerr << "Error: Cannot create file " << filename << endl; //Ошибка: не удалось создать файл
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return false;
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}
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output_file << setw(4) << j << endl;
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cout << "Successfully saved " << blocks.size() << " blocks to " << filename << endl; //Успешно сохранено //блоков в файл
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return true;
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}
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void printBlock(const Block& block) {
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cout << "index: " << block.index << "\n"
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<< "hash: " << block.hash << "\n"
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<< "timestamp: " << block.timestamp << "\n"
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<< "miner: " << block.miner << "\n"
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<< "reward: " << fixed << setprecision(2) << block.reward << "\n"
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<< "secret_info: " << block.secret_info << "\n"
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<< "nonce: " << block.nonce << "\n"
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<< "Transactions (" << block.transactions.size() << "):\n";
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for (const auto& tx : block.transactions) {
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cout << " " << tx.from << " -> " << tx.to << ": " << tx.value << "\n";
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}
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cout << "----------------------------\n";
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}
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void printAllBlocks() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks.Download them first." << endl; //Нет данных о блоках. Загрузите их сначала.
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return;
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}
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for (const auto& block : blocks) {
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printBlock(block);
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}
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}
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void filterByMiner() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl; //Нет данных о блоках. Загрузите их сначала.
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return;
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}
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string minerName;
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cout << "Enter the miner's name: "; //Введите имя майнера:
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cin >> minerName;
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bool found = false;
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for (const auto& block : blocks) {
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if (block.miner == minerName) {
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printBlock(block);
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found = true;
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}
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}
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if (!found) {
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cout << "Blocks with a miner " << minerName << " not found." << endl; //Блоки с майнером ... не найдены
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}
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}
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void printTransactionsCount() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl; //Нет данных о блоках. Загрузите их сначала.
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return;
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}
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cout << "Number of transactions in blocks: " << endl; //Количество транзакций в блоках:
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for (const auto& block : blocks) {
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cout << "block " << block.index << ": "
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<< block.transactions.size() << " transactions" << endl;
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}
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}
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void calculateBalances() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl; //Нет данных о блоках. Загрузите их сначала.
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return;
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}
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map<string, double> balances;
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for (const auto& block : blocks) {
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for (const auto& tx : block.transactions) {
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if (tx.from != "SYSTEM") {
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balances[tx.from] -= tx.value;
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}
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balances[tx.to] += tx.value;
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}
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}
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cout << "User balances:" << endl; //Балансы пользователей:
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for (const auto& entry : balances) {
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cout << entry.first << ": " << fixed << setprecision(2) << entry.second << endl;
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}
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}
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void sortBlocksByIndex() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl;
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return;
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}
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for (size_t i = 0; i < blocks.size(); ++i) {
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for (size_t j = 0; j < blocks.size() - i - 1; ++j) {
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if (blocks[j].index > blocks[j + 1].index) {
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swap(blocks[j], blocks[j + 1]);
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}
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}
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}
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cout << "The blocks are sorted by index." << endl; //Блоки отсортированы по индексу.
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}
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void printEvenIndexBlocks() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl;
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return;
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}
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cout << "Blocks with an even index:" << endl; //Блоки с четным индексом:
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for (const auto& block : blocks) {
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if (block.index % 2 == 0) {
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printBlock(block);
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}
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}
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}
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void printVowelMinerBlocks() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl;
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return;
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}
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const string vowels = "AEIOUaeiou";
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cout << "Blocks where the miner starts with a vowel:" << endl; //Блоки, где майнер начинается с гласной:
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for (const auto& block : blocks) {
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if (!block.miner.empty() && vowels.find(block.miner[0]) != string::npos) {
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printBlock(block);
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}
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}
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}
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void printFourDigitNonceBlocks() {
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if (blocks.empty()) {
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cout << "There is no data about the blocks. Download them first." << endl;
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return;
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}
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cout << "Blocks with a 4-digit nonce (1000-9999):" << endl; //Блоки с 4-значным nonce (1000-9999):
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for (const auto& block : blocks) {
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if (block.nonce >= 1000 && block.nonce <= 9999) {
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printBlock(block);
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}
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}
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}
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void showMenu() {
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cout << "\n=== Menu ===" << endl //Загрузить блоки из файла
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<< "1. Load blocks from file" << endl //Загрузить блоки из файла
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<< "2. Save blocks to file" << endl //Сохранить блоки в файл
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<< "3. Print all blocks" << endl //Вывести все блоки
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<< "4. Filter by miner" << endl //Фильтр по майнеру
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<< "5. Transaction count" << endl //Количество транзакций
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<< "6. User balances" << endl //Балансы пользователей
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<< "7. Sort by index" << endl //Сортировать по индексу
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<< "8. Blocks with even index" << endl //Блоки с четным индексом
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<< "9. Blocks where miner starts with a vowel" << endl //Блоки, где майнер начинается с гласной
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<< "10. Blocks with 4-digit nonce" << endl //Блоки с 4-значным nonce
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<< "0. Exit" << endl //Выход
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<< "Enter choice: "; //Введите номер
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}
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int main() {
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int choice;
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do {
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showMenu();
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cin >> choice;
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switch (choice) {
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case 1: {
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string filename;
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cout << "Enter the file name to download: "; //Введите имя файла для загрузки:
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cin >> filename;
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if (!loadBlocksFromFile(filename)) {
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cout << "File upload error!" << endl; //Ошибка загрузки файла!
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}
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break;
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}
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case 2: {
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string filename;
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cout << "Enter the file name to save: "; //Введите имя файла для сохранения:
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cin >> filename;
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if (!saveBlocksToFile(filename)) {
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cout << "File upload error!" << endl;
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}
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break;
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}
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case 3:
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printAllBlocks();
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break;
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case 4:
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filterByMiner();
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break;
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case 5:
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printTransactionsCount();
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break;
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case 6:
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calculateBalances();
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break;
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case 7:
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sortBlocksByIndex();
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break;
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case 8:
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printEvenIndexBlocks();
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break;
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case 9:
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printVowelMinerBlocks();
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break;
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case 10:
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printFourDigitNonceBlocks();
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break;
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case 0:
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cout << "Exit the program..." << endl;
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break;
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default:
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cout << "Wrong choice! Try again." << endl; //Неверный выбор! Попробуйте снова.
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}
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} while (choice != 0);
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return 0;
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}
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