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/*
* vdr-vodcatcher - A plugin for the Linux Video Disk Recorder
* Copyright (c) 2007 - 2009 Tobias Grimm <vdr@e-tobi.net>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <sys/stat.h>
#include <fstream>
#include <dirent.h>
#include "LocalFileCache.h"
#include "SdbmHashCalculator.h"
#include <values.h>
using namespace std;
LocalFileCache::LocalFileCache(const string& cacheDirName) :
_cacheDirName(cacheDirName)
{
}
RefPtr<istream> LocalFileCache::CreateStreamByUrl(const string& url) const
{
ifstream* localFile = new ifstream();
localFile->open(UrlToLocalFileName(url).c_str());
if (!localFile->fail())
{
return RefPtr<istream>(localFile);
}
else
{
delete localFile;
return RefPtr<istream>(NULL);
}
}
void LocalFileCache::Put(istream& document, const string& url)
{
ofstream localFile(UrlToLocalFileName(url).c_str());
localFile << document.rdbuf();
localFile.close();
if (!localFile.good())
{
unlink(UrlToLocalFileName(url).c_str());
}
}
string LocalFileCache::UrlToLocalFileName(const string& url) const
{
return _cacheDirName + "/" + SdbmHashCalculator::Calculate(url);
}
long LocalFileCache::GetAgeInMinutes(const string& url) const
{
return GetLocalFileAge(UrlToLocalFileName(url));
}
bool LocalFileCache::IsCached(const string& url) const
{
struct stat buf;
if (0 == stat(UrlToLocalFileName(url).c_str(), &buf))
{
return true;
}
else
{
return false;
}
}
void LocalFileCache::CleanUp(const long maxAgeInDays)
{
DIR* directory = opendir(_cacheDirName.c_str());
if (directory)
{
struct dirent* entry;
while ((entry = readdir(directory)))
{
string fileName = entry->d_name;
if ((fileName != ".") & (fileName != ".."))
{
fileName = string(_cacheDirName) + "/" + fileName;
if (GetLocalFileAge(fileName) >= maxAgeInDays * 60 * 24)
{
remove(fileName.c_str());
}
}
}
}
closedir(directory);
}
long LocalFileCache::GetLocalFileAge(const string& localFileName) const
{
struct stat buf;
time_t tm = time(NULL);
if (0 == stat(localFileName.c_str(), &buf))
{
return (tm - buf.st_mtime) / 60 ;
}
return MAXLONG;
}
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