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change(cache): use cache-specific http headers for their lifetime

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This uses the 'Age', 'Cache-Control' and 'Expires' HTTP headers to more
accurately set up the cache lifetime, falling back to a static 1-week
time if they're not present in the response.

Signed-off-by: flow <flowlnlnln@gmail.com>
This commit is contained in:
flow
2022-07-17 11:24:12 -03:00
parent c8a72c876d
commit ab6e1b112b
3 changed files with 53 additions and 9 deletions
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38
launcher/net/MetaCacheSink.cpp
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@ -36,11 +36,16 @@
#include "MetaCacheSink.h"
#include <QFile>
#include <QFileInfo>
#include "FileSystem.h"
#include "Application.h"
namespace Net {
/** Maximum time to hold a cache entry
* = 1 week in seconds
*/
#define MAX_TIME_TO_EXPIRE 1*7*24*60*60
MetaCacheSink::MetaCacheSink(MetaEntryPtr entry, ChecksumValidator * md5sum)
:Net::FileSink(entry->getFullPath()), m_entry(entry), m_md5Node(md5sum)
{
@ -88,6 +93,37 @@ Task::State MetaCacheSink::finalizeCache(QNetworkReply & reply)
}
m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch());
{ // Cache lifetime
if (reply.hasRawHeader("Cache-Control")) {
auto cache_control_header = reply.rawHeader("Cache-Control");
// qDebug() << "[MetaCache] Parsing 'Cache-Control' header with" << cache_control_header;
QRegularExpression max_age_expr("max-age=([0-9]+)");
qint64 max_age = max_age_expr.match(cache_control_header).captured(1).toLongLong();
m_entry->setMaximumAge(max_age);
} else if (reply.hasRawHeader("Expires")) {
auto expires_header = reply.rawHeader("Expires");
// qDebug() << "[MetaCache] Parsing 'Expires' header with" << expires_header;
qint64 max_age = QDateTime::fromString(expires_header).toSecsSinceEpoch() - QDateTime::currentSecsSinceEpoch();
m_entry->setMaximumAge(max_age);
} else {
m_entry->setMaximumAge(MAX_TIME_TO_EXPIRE);
}
if (reply.hasRawHeader("Age")) {
auto age_header = reply.rawHeader("Age");
// qDebug() << "[MetaCache] Parsing 'Age' header with" << age_header;
qint64 current_age = age_header.toLongLong();
m_entry->setCurrentAge(current_age);
} else {
m_entry->setCurrentAge(0);
}
}
m_entry->setStale(false);
APPLICATION->metacache()->updateEntry(m_entry);