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#include "CacheManager.h"
#include <filesystem>
#include <fstream>
#include <iostream>
#include <ctime>
#include <thread>
#include <chrono>
CacheManager::CacheManager(const char* cache_path) : CacheManager(std::string(cache_path)) { }
CacheManager::CacheManager(std::string cache_path) {
this->cache_path = cache_path;
this->verify_cache();
}
CacheManager::~CacheManager() {
for (std::fstream* file : this->files) {
if (file != nullptr) {
file->close();
delete file;
file = nullptr;
}
}
}
void CacheManager::verify_cache() {
if (!std::filesystem::is_directory(this->cache_path)) this->init_cache();
this->update_cache();
}
void CacheManager::init_cache() {
std::filesystem::create_directory(this->cache_path);
this->update_cache();
}
void CacheManager::update_cache() {
std::fstream& date = *cache_get("date");
this->age = std::time(nullptr);
date << this->age;
date.close();
}
std::fstream* CacheManager::cache_get(std::string filename) { return cache_get(filename.c_str()); }
std::fstream* CacheManager::cache_get(const char* filename) {
std::filesystem::path fixed_path = prefix_cache_path(filename); // fix duplicate slashes and add prefix
unsigned int i = 0;
i = 0;
while (!std::filesystem::exists(fixed_path.parent_path())) {
std::filesystem::create_directories(fixed_path.parent_path()); // make sure folder exists
std::this_thread::sleep_for(std::chrono::milliseconds(1));
i++;
if (i > 100) {
std::cout << "folder touch doesn't succeed after 100 tries on file " << fixed_path << std::endl;
exit(1);
}
}
i = 0;
while (!std::filesystem::exists(fixed_path)) {
std::fstream(fixed_path, std::ios::trunc | std::ios::out).close(); // touch file
std::this_thread::sleep_for(std::chrono::milliseconds(1));
i++;
if (i > 100) {
std::cout << "file touch doesn't succeed after 100 tries on file " << fixed_path << std::endl;
exit(1);
}
}
i = 0;
std::fstream* file = nullptr;
do {
delete file;
file = new std::fstream(fixed_path.c_str(), std::ios::out | std::ios::in); // open file
std::this_thread::sleep_for(std::chrono::milliseconds(1));
i++;
if (i > 100) {
std::cout << "file open doesn't succeed after 100 tries on file " << fixed_path << std::endl;
exit(1);
}
} while (!file->is_open());
this->files.push_back(file); // add file pointer (for closing all files on exit)
return file;
}
bool CacheManager::cache_exists(std::string filename) { return cache_exists(filename.c_str()); }
bool CacheManager::cache_exists(const char* filename) {
return std::filesystem::exists(prefix_cache_path(filename));
}
std::string CacheManager::prefix_cache_path(const char* filename) {
return this->cache_path + "/" + std::string(filename);
}
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