void
AvatarManager::RemoveOldAvatarCacheEntries()
{
string cacheDir;
{
boost::mutex::scoped_lock lock(m_cacheDirMutex);
cacheDir = m_cacheDir;
}
try {
path cachePath(cacheDir);
cacheDir = cachePath.directory_string();
// Never delete anything if we do not have a special cache dir set.
if (!cacheDir.empty()) {
boost::mutex::scoped_lock lock(m_cachedAvatarsMutex);
// First pass: Remove files which no longer exist.
// Count files and record age.
AvatarList removeList;
TimeAvatarMap timeMap;
{
AvatarMap::const_iterator i = m_cachedAvatars.begin();
AvatarMap::const_iterator end = m_cachedAvatars.end();
while (i != end) {
bool keepFile = false;
path filePath(i->second);
string fileString(filePath.file_string());
// Only consider files which are definitely in the cache dir.
if (fileString.size() > cacheDir.size() && fileString.substr(0, cacheDir.size()) == cacheDir) {
// Only consider files with MD5 as file name.
MD5Buf tmpBuf;
if (exists(filePath) && tmpBuf.FromString(basename(filePath))) {
timeMap.insert(TimeAvatarMap::value_type(last_write_time(filePath), i->first));
keepFile = true;
}
}
if (!keepFile)
removeList.push_back(i->first);
++i;
}
}
{
AvatarList::const_iterator i = removeList.begin();
AvatarList::const_iterator end = removeList.end();
while (i != end) {
m_cachedAvatars.erase(*i);
++i;
}
removeList.clear();
}
// Remove and physically delete files in one of the
// following cases:
// 1. More than MAX_NUMBER_OF_FILES files are present
// - delete until only MAX_NUMBER_OF_FILES/2 are left.
// 2. Files are older than 30 days.
if (m_cachedAvatars.size() > MAX_NUMBER_OF_FILES) {
while (!timeMap.empty() && m_cachedAvatars.size() > MAX_NUMBER_OF_FILES / 2) {
TimeAvatarMap::iterator i = timeMap.begin();
AvatarMap::iterator pos = m_cachedAvatars.find(i->second);
if (pos != m_cachedAvatars.end()) {
path tmpPath(pos->second);
remove(tmpPath);
m_cachedAvatars.erase(pos);
}
timeMap.erase(i);
}
}
// Get reference time.
time_t curTime = time(NULL);
while (!timeMap.empty() && !m_cachedAvatars.empty()) {
TimeAvatarMap::iterator i = timeMap.begin();
if (curTime - i->first < (int)MAX_AVATAR_CACHE_AGE)
break;
AvatarMap::iterator pos = m_cachedAvatars.find(i->second);
if (pos != m_cachedAvatars.end()) {
path tmpPath(pos->second);
remove(tmpPath);
m_cachedAvatars.erase(pos);
}
timeMap.erase(i);
}
}
} catch (...) {
LOG_ERROR("Exception caught while cleaning up cache.");
}
}
