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Fix autotest failures in QAbstractNetworkCache

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The cache expiration calculation was previously removed to avoid
calculating it every time an object is fetched from the cache.
This is because the expiration date is calculated from max-age or
expires headers when the object is added to the cache.

However this broke the case where the server only provides a
last-modified header. In this case, the expiration date needs
to be checked at fetch time in order to add the warning if the
object is >24h old.

Change-Id: Iad381da0f91c27ac603abbaa94f268700ad2297f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Shane Kearns 2012-04-12 17:28:37 +01:00 committed by Qt by Nokia
parent 17412400dc
commit 3c0fdefc31
1 changed files with 61 additions and 59 deletions
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120
src/network/access/qnetworkreplyhttpimpl.cpp
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@ -513,69 +513,71 @@ bool QNetworkReplyHttpImplPrivate::loadFromCacheIfAllowed(QHttpNetworkRequest &h
QDateTime currentDateTime = QDateTime::currentDateTime();
QDateTime expirationDate = metaData.expirationDate();
#if 0
/*
* age_value
* is the value of Age: header received by the cache with
* this response.
* date_value
* is the value of the origin server's Date: header
* request_time
* is the (local) time when the cache made the request
* that resulted in this cached response
* response_time
* is the (local) time when the cache received the
* response
* now
* is the current (local) time
*/
int age_value = 0;
it = cacheHeaders.findRawHeader("age");
if (it != cacheHeaders.rawHeaders.constEnd())
age_value = it->second.toInt();
QDateTime dateHeader;
int date_value = 0;
it = cacheHeaders.findRawHeader("date");
if (it != cacheHeaders.rawHeaders.constEnd()) {
dateHeader = QNetworkHeadersPrivate::fromHttpDate(it->second);
date_value = dateHeader.toTime_t();
}
int now = currentDateTime.toUTC().toTime_t();
int request_time = now;
int response_time = now;
// Algorithm from RFC 2616 section 13.2.3
int apparent_age = qMax(0, response_time - date_value);
int corrected_received_age = qMax(apparent_age, age_value);
int response_delay = response_time - request_time;
int corrected_initial_age = corrected_received_age + response_delay;
int resident_time = now - response_time;
int current_age = corrected_initial_age + resident_time;
// RFC 2616 13.2.4 Expiration Calculations
bool response_is_fresh;
if (!expirationDate.isValid()) {
if (lastModified.isValid()) {
int diff = currentDateTime.secsTo(lastModified);
expirationDate = lastModified;
expirationDate.addSecs(diff / 10);
if (httpRequest.headerField("Warning").isEmpty()) {
QDateTime dt;
dt.setTime_t(current_age);
if (dt.daysTo(currentDateTime) > 1)
httpRequest.setHeaderField("Warning", "113");
/*
* age_value
* is the value of Age: header received by the cache with
* this response.
* date_value
* is the value of the origin server's Date: header
* request_time
* is the (local) time when the cache made the request
* that resulted in this cached response
* response_time
* is the (local) time when the cache received the
* response
* now
* is the current (local) time
*/
int age_value = 0;
it = cacheHeaders.findRawHeader("age");
if (it != cacheHeaders.rawHeaders.constEnd())
age_value = it->second.toInt();
QDateTime dateHeader;
int date_value = 0;
it = cacheHeaders.findRawHeader("date");
if (it != cacheHeaders.rawHeaders.constEnd()) {
dateHeader = QNetworkHeadersPrivate::fromHttpDate(it->second);
date_value = dateHeader.toTime_t();
}
int now = currentDateTime.toUTC().toTime_t();
int request_time = now;
int response_time = now;
// Algorithm from RFC 2616 section 13.2.3
int apparent_age = qMax(0, response_time - date_value);
int corrected_received_age = qMax(apparent_age, age_value);
int response_delay = response_time - request_time;
int corrected_initial_age = corrected_received_age + response_delay;
int resident_time = now - response_time;
int current_age = corrected_initial_age + resident_time;
// RFC 2616 13.2.4 Expiration Calculations
if (!expirationDate.isValid()) {
if (lastModified.isValid()) {
int diff = currentDateTime.secsTo(lastModified);
expirationDate = lastModified;
expirationDate.addSecs(diff / 10);
if (httpRequest.headerField("Warning").isEmpty()) {
QDateTime dt;
dt.setTime_t(current_age);
if (dt.daysTo(currentDateTime) > 1)
httpRequest.setHeaderField("Warning", "113");
}
}
}
}
// the cache-saving code below sets the expirationDate with date+max_age
// if "max-age" is present, or to Expires otherwise
int freshness_lifetime = dateHeader.secsTo(expirationDate);
bool response_is_fresh = (freshness_lifetime > current_age);
#else
bool response_is_fresh = currentDateTime.secsTo(expirationDate) >= 0;
#endif
// the cache-saving code below sets the expirationDate with date+max_age
// if "max-age" is present, or to Expires otherwise
int freshness_lifetime = dateHeader.secsTo(expirationDate);
response_is_fresh = (freshness_lifetime > current_age);
} else {
// expiration date was calculated earlier (e.g. when storing object to the cache)
response_is_fresh = currentDateTime.secsTo(expirationDate) >= 0;
}
if (!response_is_fresh)
return false;