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#include "../include/Cache.hpp"
#include "../include/env.hpp"
#include "../include/ResourceCache.hpp"
#include "../include/FileUtil.hpp"
#include "../include/Gif.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() / ".local" / "share" / "dchat";
boost::filesystem::create_directories(dchatHomeDir);
return dchatHomeDir;
}
ImageByUrlResult loadImageFromFile(const boost::filesystem::path &filepath)
{
try
{
StringView fileContent = getFileContent(filepath);
if(Gif::isDataGif(fileContent))
{
Gif *gif = new Gif(move(fileContent));
return { gif, ImageByUrlResult::Type::CACHED };
}
else
{
sf::Texture *texture = new sf::Texture();
if(texture->loadFromMemory(fileContent.data, fileContent.size))
{
delete fileContent.data;
texture->setSmooth(true);
texture->generateMipmap();
return { texture, ImageByUrlResult::Type::CACHED };
}
delete texture;
delete fileContent.data;
}
}
catch(FileException &e)
{
}
catch(FailedToLoadResourceException &e)
{
}
return { (sf::Texture*)nullptr, ImageByUrlResult::Type::FAILED_DOWNLOAD };
}
Cache::Cache() :
alive(true)
{
downloadWaitThread = thread([this]
{
while(alive)
{
for(vector<ImageDownloadInfo>::iterator it = imageDownloadProcesses.begin(); it != imageDownloadProcesses.end();)
{
int exitStatus;
if(it->process->try_get_exit_status(exitStatus))
{
bool failed = exitStatus != 0;
if(!failed)
{
boost::filesystem::path filepath = getDchatDir();
odhtdb::Hash urlHash(it->url.data(), it->url.size());
filepath /= urlHash.toString();
ImageByUrlResult imageByUrlResult = loadImageFromFile(filepath);
imageDownloadMutex.lock();
imageUrlCache[it->url] = imageByUrlResult;
imageDownloadMutex.unlock();
switch(imageByUrlResult.type)
{
case ImageByUrlResult::Type::CACHED:
printf("Downloaded image from url: %s\n", it->url.c_str());
break;
case ImageByUrlResult::Type::FAILED_DOWNLOAD:
printf("Failed to download and load image from url: %s\n", it->url.c_str());
break;
}
}
it = imageDownloadProcesses.erase(it);
}
else
++it;
}
while(alive && imageDownloadProcesses.empty() && imageDownloadProcessesQueue.empty())
this_thread::sleep_for(chrono::milliseconds(20));
if(!imageDownloadProcessesQueue.empty())
{
imageDownloadMutex.lock();
for(auto imageDownloadInfo : imageDownloadProcessesQueue)
{
imageDownloadProcesses.push_back(imageDownloadInfo);
}
imageDownloadProcessesQueue.clear();
imageDownloadMutex.unlock();
}
this_thread::sleep_for(chrono::milliseconds(20));
}
});
}
Cache::~Cache()
{
alive = false;
downloadWaitThread.join();
}
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();
ImageByUrlResult imageByUrlResult = loadImageFromFile(filepath);
if(imageByUrlResult.type == ImageByUrlResult::Type::CACHED)
{
imageUrlCache[url] = imageByUrlResult;
printf("Loaded image from file cache: %s, is gif: %s\n", url.c_str(), imageByUrlResult.isGif ? "yes" : "no");
return imageByUrlResult;
}
ImageByUrlResult result((sf::Texture*)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 + "'";
// TODO: Use this instead of curl on windows: 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 };
imageDownloadProcessesQueue.emplace_back(imageDownloadInfo);
return result;
}
}
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