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#include "abaddon.hpp"
#include "filecache.hpp"
#include "MurmurHash3.h"
std::string GetCachedName(std::string str) {
uint32_t out;
MurmurHash3_x86_32(str.c_str(), str.size(), 0, &out);
return std::to_string(out);
}
Cache::Cache() {
m_tmp_path = std::filesystem::temp_directory_path() / "abaddon-cache";
std::filesystem::create_directories(m_tmp_path);
m_worker.set_file_path(m_tmp_path);
}
Cache::~Cache() {
m_worker.stop();
for (auto &future : m_futures)
if (future.valid()) future.get();
std::error_code err;
if (!std::filesystem::remove_all(m_tmp_path, err))
fprintf(stderr, "error removing tmp dir\n");
}
void Cache::ClearCache() {
for (const auto &path : std::filesystem::directory_iterator(m_tmp_path))
std::filesystem::remove_all(path);
}
void Cache::RespondFromPath(std::filesystem::path path, callback_type cb) {
cb(path.string());
}
void Cache::GetFileFromURL(std::string url, callback_type cb) {
auto cache_path = m_tmp_path / GetCachedName(url);
if (std::filesystem::exists(cache_path)) {
m_mutex.lock();
m_futures.push_back(std::async(std::launch::async, [this, cache_path, cb]() { RespondFromPath(cache_path, cb); }));
m_mutex.unlock();
return;
}
if (m_callbacks.find(url) != m_callbacks.end()) {
m_callbacks[url].push_back(cb);
} else {
m_callbacks[url].push_back(cb);
m_worker.add_image(url, [this, url](const std::string &path) {
OnFetchComplete(url);
});
}
}
std::string Cache::GetPathIfCached(std::string url) {
auto cache_path = m_tmp_path / GetCachedName(url);
if (std::filesystem::exists(cache_path)) {
return cache_path.string();
}
return "";
}
// this just seems really yucky
void Cache::CleanupFutures() {
std::lock_guard<std::mutex> l(m_mutex);
for (auto it = m_futures.begin(); it != m_futures.end();) {
if (it->valid() && it->wait_for(std::chrono::seconds(0)) == std::future_status::ready)
it = m_futures.erase(it);
else
it++;
}
}
void Cache::OnResponse(const std::string &url) {
CleanupFutures(); // see above comment
auto path = m_tmp_path / GetCachedName(url);
m_mutex.lock();
const auto key = static_cast<std::string>(url);
auto callbacks = std::move(m_callbacks[key]);
m_callbacks.erase(key);
m_mutex.unlock();
for (const auto &cb : callbacks)
cb(path.string());
}
void Cache::OnFetchComplete(const std::string &url) {
m_mutex.lock();
m_futures.push_back(std::async(std::launch::async, std::bind(&Cache::OnResponse, this, url)));
m_mutex.unlock();
}
FileCacheWorkerThread::FileCacheWorkerThread() {
m_multi_handle = curl_multi_init();
m_thread = std::thread(std::bind(&FileCacheWorkerThread::loop, this));
}
FileCacheWorkerThread::~FileCacheWorkerThread() {
if (!m_stop) stop();
for (const auto handle : m_handles)
curl_easy_cleanup(handle);
curl_multi_cleanup(m_multi_handle);
}
void FileCacheWorkerThread::set_file_path(const std::filesystem::path &path) {
m_data_path = path;
}
void FileCacheWorkerThread::add_image(const std::string &string, callback_type callback) {
m_queue_mutex.lock();
m_queue.push({ string, callback });
m_cv.notify_one();
m_queue_mutex.unlock();
}
void FileCacheWorkerThread::stop() {
m_stop = true;
if (m_thread.joinable()) {
m_cv.notify_all();
m_thread.join();
}
}
void FileCacheWorkerThread::loop() {
while (!m_stop) {
if (m_handles.size() == 0) {
std::unique_lock<std::mutex> lock(m_queue_mutex);
int s = m_queue.size();
if (s == 0)
m_cv.wait(lock);
}
if (m_handles.size() < Abaddon::Get().GetSettings().GetCacheHTTPConcurrency()) {
std::optional<QueueEntry> entry;
m_queue_mutex.lock();
if (m_queue.size() > 0) {
entry = std::move(m_queue.front());
m_queue.pop();
}
m_queue_mutex.unlock();
if (entry.has_value()) {
if (m_callbacks.find(entry->URL) != m_callbacks.end()) {
printf("url is being requested twice :(\n");
continue;
}
// add the ! and rename after so the image loader thing doesnt pick it up if its not done yet
auto path = m_data_path / (GetCachedName(entry->URL) + "!");
FILE *fp = std::fopen(path.string().c_str(), "wb");
if (fp == nullptr) {
printf("couldn't open fp\n");
continue;
}
CURL *handle = curl_easy_init();
m_handles.insert(handle);
curl_easy_setopt(handle, CURLOPT_URL, entry->URL.c_str());
curl_easy_setopt(handle, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(handle, CURLOPT_WRITEDATA, fp);
m_handle_urls[handle] = entry->URL;
m_curl_file_handles[handle] = fp;
m_callbacks[entry->URL] = entry->Callback;
m_paths[entry->URL] = std::move(path);
curl_multi_add_handle(m_multi_handle, handle);
}
}
//int fds;
//curl_multi_wait(m_multi_handle, nullptr, 0, 10, &fds);
curl_multi_perform(m_multi_handle, &m_running_handles);
int num_msgs;
while (auto msg = curl_multi_info_read(m_multi_handle, &num_msgs)) {
if (msg->msg == CURLMSG_DONE) {
auto url = m_handle_urls.at(msg->easy_handle);
auto fp = m_curl_file_handles.find(msg->easy_handle);
std::fclose(fp->second);
m_handles.erase(msg->easy_handle);
m_handle_urls.erase(msg->easy_handle);
curl_multi_remove_handle(m_multi_handle, msg->easy_handle);
curl_easy_cleanup(msg->easy_handle);
auto path = m_paths.at(url).string();
auto cb = m_callbacks.at(url);
m_callbacks.erase(url);
m_paths.erase(url);
m_curl_file_handles.erase(fp);
// chop off the !
auto old = path;
path.pop_back();
std::filesystem::rename(old, path);
cb(path);
}
}
}
}
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