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fix: add expiration time to cache entries

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This is to prevent problems where the cache entry would still be used
way after the remote resource got updated. The limit is hardcoded for 1
week, which I think is a reasonable time, but this could be further
tweaked.

Signed-off-by: flow <flowlnlnln@gmail.com>
This commit is contained in:
flow 2022-07-16 20:29:03 -03:00
parent dce435c882
commit ec87a8ddfc
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GPG Key ID: 8D0F221F0A59F469
1 changed files with 16 additions and 0 deletions
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16
launcher/net/HttpMetaCache.cpp
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@ -44,6 +44,11 @@
#include <QDebug> #include <QDebug>
/** Maximum time to hold a cache entry
* = 1 week in milliseconds
*/
#define TIME_TO_EXPIRE 1*7*24*60*60*1000
auto MetaEntry::getFullPath() -> QString auto MetaEntry::getFullPath() -> QString
{ {
// FIXME: make local? // FIXME: make local?
@ -121,6 +126,15 @@ auto HttpMetaCache::resolveEntry(QString base, QString resource_path, QString ex
SaveEventually(); SaveEventually();
} }
// Get rid of old entries, to prevent cache problems
auto current_time = QDateTime::currentMSecsSinceEpoch();
auto remote_time = QDateTime::fromString(entry->remote_changed_timestamp).toMSecsSinceEpoch();
if (current_time - remote_time < TIME_TO_EXPIRE) {
qWarning() << "Removing cache entry because of old age!";
selected_base.entry_list.remove(resource_path);
return staleEntry(base, resource_path);
}
// entry passed all the checks we cared about. // entry passed all the checks we cared about.
entry->basePath = getBasePath(base); entry->basePath = getBasePath(base);
return entry; return entry;
@ -240,6 +254,8 @@ void HttpMetaCache::SaveNow()
if (m_index_file.isNull()) if (m_index_file.isNull())
return; return;
qDebug() << "[HttpMetaCache]" << "Saving metacache with" << m_entries.size() << "entries";
QJsonObject toplevel; QJsonObject toplevel;
Json::writeString(toplevel, "version", "1"); Json::writeString(toplevel, "version", "1");