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#include "../include/Cache.hpp"
#include "../include/env.hpp"
#include "../include/ResourceCache.hpp"
#include <boost/filesystem/convenience.hpp>
#include <unordered_map>
#include <process.hpp>
#include <odhtdb/Hash.hpp>
#if OS_FAMILY == OS_FAMILY_POSIX
#include <pwd.h>
#else
#include <string>
#endif
using namespace std;
using namespace TinyProcessLib;
namespace dchat
{
unordered_map<string, ImageByUrlResult> imageUrlCache;
boost::filesystem::path getHomeDir()
{
#if OS_FAMILY == OS_FAMILY_POSIX
const char *homeDir = getenv("HOME");
if(!homeDir)
{
passwd *pw = getpwuid(getuid());
homeDir = pw->pw_dir;
}
return boost::filesystem::path(homeDir);
#elif OS_FAMILY == OS_FAMILY_WINDOWS
BOOL ret;
HANDLE hToken;
std::wstring homeDir;
DWORD homeDirLen = MAX_PATH;
homeDir.resize(homeDirLen);
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &hToken))
return Result<FileString>::Err("Failed to open process token");
if (!GetUserProfileDirectory(hToken, &homeDir[0], &homeDirLen))
{
CloseHandle(hToken);
return Result<FileString>::Err("Failed to get home directory");
}
CloseHandle(hToken);
homeDir.resize(wcslen(homeDir.c_str()));
return boost::filesystem::path(homeDir);
#endif
}
boost::filesystem::path Cache::getDchatDir()
{
boost::filesystem::path dchatHomeDir = getHomeDir() / ".dchat";
boost::filesystem::create_directories(dchatHomeDir);
return dchatHomeDir;
}
Cache::Cache()
{
downloadWaitThread = thread([this]
{
while(true)
{
imageDownloadMutex.lock();
for(vector<ImageDownloadInfo>::iterator it = imageDownloadProcesses.begin(); it != imageDownloadProcesses.end();)
{
int exitStatus;
if(it->process->try_get_exit_status(exitStatus))
{
bool failed = exitStatus != 0;
ImageByUrlResult &imageByUrlResult = imageUrlCache[it->url];
if(!failed)
{
boost::filesystem::path filepath = getDchatDir();
odhtdb::Hash urlHash(it->url.data(), it->url.size());
filepath /= urlHash.toString();
try
{
sf::Texture *texture = ResourceCache::getTexture(filepath.string());
imageByUrlResult.texture = texture;
imageByUrlResult.type = ImageByUrlResult::Type::CACHED;
printf("Image downloaded from url: %s, texture: %u\n", it->url.c_str(), texture);
}
catch(FailedToLoadResourceException &e)
{
fprintf(stderr, "%s\n", e.what());
failed = true;
}
}
if(failed)
{
imageByUrlResult.type = ImageByUrlResult::Type::FAILED_DOWNLOAD;
fprintf(stderr, "Image download failed for url: %s\n", it->url.c_str());
}
it = imageDownloadProcesses.erase(it);
}
else
++it;
}
imageDownloadMutex.unlock();
while(imageDownloadProcesses.empty())
this_thread::sleep_for(chrono::milliseconds(20));
this_thread::sleep_for(chrono::milliseconds(20));
}
});
downloadWaitThread.detach();
}
const ImageByUrlResult Cache::getImageByUrl(const string &url, int downloadLimitBytes)
{
lock_guard<mutex> lock(imageDownloadMutex);
auto it = imageUrlCache.find(url);
if(it != imageUrlCache.end())
return it->second;
// TODO: Verify hashed url is not too long for filepath on windows
boost::filesystem::path filepath = getDchatDir();
odhtdb::Hash urlHash(url.data(), url.size());
filepath /= urlHash.toString();
// Check if file exists because we dont want sfml spam with "Failed to load image""...
if(boost::filesystem::exists(filepath))
{
try
{
sf::Texture *texture = ResourceCache::getTexture(filepath.string());
ImageByUrlResult result { texture, ImageByUrlResult::Type::CACHED };
imageUrlCache[url] = result;
printf("Loading image from file cache: %s\n", url.c_str());
return result;
}
catch(FailedToLoadResourceException &e)
{
}
}
ImageByUrlResult result { nullptr, ImageByUrlResult::Type::DOWNLOADING };
imageUrlCache[url] = result;
string downloadLimitBytesStr = to_string(downloadLimitBytes);
Process::string_type cmd = "curl -L --silent -o '";
cmd += filepath.native();
cmd += "' --max-filesize " + downloadLimitBytesStr + " --range 0-" + downloadLimitBytesStr + " --url '" + url + "'";
// certutil.exe -urlcache -split -f "https://url/to/file" path/and/name/to/save/as/file
Process *process = new Process(cmd, "", nullptr, nullptr, false);
ImageDownloadInfo imageDownloadInfo { process, url };
imageDownloadProcesses.emplace_back(imageDownloadInfo);
return result;
}
}
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