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#include "filecache.hpp"
Cache::Cache() {
m_tmp_path = std::filesystem::temp_directory_path() / "abaddon-cache";
std::filesystem::create_directories(m_tmp_path);
}
Cache::~Cache() {
std::error_code err;
if (!std::filesystem::remove_all(m_tmp_path, err))
fprintf(stderr, "error removing tmp dir\n");
}
std::string Cache::SanitizeString(std::string str) {
std::string ret;
for (const char c : str) {
if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z'))
ret += c;
else
ret += '_';
}
return ret;
}
void Cache::RespondFromPath(std::filesystem::path path, callback_type cb) {
/*if (!std::filesystem::exists(path)) return;
FILE *fp = std::fopen(path.string().c_str(), "rb");
if (fp == nullptr) return;
std::fseek(fp, 0, SEEK_END);
int len = std::ftell(fp);
std::rewind(fp);
std::vector<uint8_t> ret;
ret.resize(len);
std::fread(ret.data(), 1, len, fp);
std::fclose(fp);*/
cb(path.string());
}
void Cache::GetFileFromURL(std::string url, callback_type cb) {
auto cache_path = m_tmp_path / SanitizeString(url);
if (std::filesystem::exists(cache_path)) {
RespondFromPath(cache_path, cb);
return;
}
if (m_callbacks.find(url) != m_callbacks.end()) {
m_callbacks[url].push_back(cb);
} else {
m_futures.push_back(cpr::GetCallback(std::bind(&Cache::OnResponse, this, std::placeholders::_1), cpr::Url { url }));
m_callbacks[url].push_back(cb);
}
}
// this just seems really yucky
void Cache::CleanupFutures() {
for (auto it = m_futures.begin(); it != m_futures.end();) {
if (it->wait_for(std::chrono::seconds(0)) == std::future_status::ready)
it = m_futures.erase(it);
else
it++;
}
}
void Cache::OnResponse(const cpr::Response &r) {
CleanupFutures(); // see above comment
if (r.error || r.status_code > 300) return;
std::vector<uint8_t> data(r.text.begin(), r.text.end());
auto path = m_tmp_path / SanitizeString(r.url);
FILE *fp = std::fopen(path.string().c_str(), "wb");
if (fp == nullptr)
return;
std::fwrite(data.data(), 1, data.size(), fp);
std::fclose(fp);
for (const auto &cb : m_callbacks[r.url]) {
cb(path.string());
}
m_callbacks.erase(r.url);
}
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