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Bug 796192 - A/B test HTTP Pipelining on pre-release channel. r=mcmanus

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This commit is contained in:
Valentin Gosu 2012-10-04 21:08:58 -04:00
parent c3a4630b9e
commit 3ce8119088
3 changed files with 53 additions and 0 deletions
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1
modules/libpref/src/init/all.js
View File

@ -868,6 +868,7 @@ pref("network.http.accept-encoding", "gzip, deflate");
pref("network.http.pipelining" , false);
pref("network.http.pipelining.ssl" , false); // disable pipelining over SSL
pref("network.http.pipelining.abtest", false);
pref("network.http.proxy.pipelining", false);
// Max number of requests in the pipeline

49
netwerk/protocol/http/nsHttpHandler.cpp
View File

@ -138,6 +138,7 @@ nsHttpHandler::nsHttpHandler()
, mMaxRequestAttempts(10)
, mMaxRequestDelay(10)
, mIdleSynTimeout(250)
, mPipeliningEnabled(false)
, mMaxConnections(24)
, mMaxPersistentConnectionsPerServer(2)
, mMaxPersistentConnectionsPerProxy(4)
@ -201,6 +202,10 @@ nsHttpHandler::~nsHttpHandler()
// and it'll segfault. NeckoChild will get cleaned up by process exit.
nsHttp::DestroyAtomTable();
if (mPipelineTestTimer) {
mPipelineTestTimer->Cancel();
mPipelineTestTimer = nullptr;
}
gHttpHandler = nullptr;
}
@ -868,6 +873,7 @@ nsHttpHandler::PrefsChanged(nsIPrefBranch *prefs, const char *pref)
mCapabilities |= NS_HTTP_ALLOW_PIPELINING;
else
mCapabilities &= ~NS_HTTP_ALLOW_PIPELINING;
mPipeliningEnabled = cVar;
}
}
@ -1186,10 +1192,53 @@ nsHttpHandler::PrefsChanged(nsIPrefBranch *prefs, const char *pref)
}
}
//
// Test HTTP Pipelining (bug796192)
// If experiments are allowed and pipelining is Off,
// turn it On for just 10 minutes
//
if (mAllowExperiments && !mPipeliningEnabled &&
PREF_CHANGED(HTTP_PREF("pipelining.abtest"))) {
rv = prefs->GetBoolPref(HTTP_PREF("pipelining.abtest"), &cVar);
if (NS_SUCCEEDED(rv)) {
// If option is enabled, only test for ~1% of sessions
if (cVar && !(rand() % 128)) {
mCapabilities |= NS_HTTP_ALLOW_PIPELINING;
if (mPipelineTestTimer)
mPipelineTestTimer->Cancel();
mPipelineTestTimer =
do_CreateInstance("@mozilla.org/timer;1", &rv);
if (NS_SUCCEEDED(rv)) {
rv = mPipelineTestTimer->InitWithFuncCallback(
TimerCallback, this, 10*60*1000, // 10 minutes
nsITimer::TYPE_ONE_SHOT);
}
} else {
mCapabilities &= ~NS_HTTP_ALLOW_PIPELINING;
if (mPipelineTestTimer) {
mPipelineTestTimer->Cancel();
mPipelineTestTimer = nullptr;
}
}
}
}
#undef PREF_CHANGED
#undef MULTI_PREF_CHANGED
}
/**
* Static method called by mPipelineTestTimer when it expires.
*/
void
nsHttpHandler::TimerCallback(nsITimer * aTimer, void * aClosure)
{
nsRefPtr<nsHttpHandler> thisObject = static_cast<nsHttpHandler*>(aClosure);
if (!thisObject->mPipeliningEnabled)
thisObject->mCapabilities &= ~NS_HTTP_ALLOW_PIPELINING;
}
/**
* Allocates a C string into that contains a ISO 639 language list
* notated with HTTP "q" values for output with a HTTP Accept-Language

3
netwerk/protocol/http/nsHttpHandler.h
View File

@ -255,6 +255,7 @@ private:
void NotifyObservers(nsIHttpChannel *chan, const char *event);
static void TimerCallback(nsITimer * aTimer, void * aClosure);
private:
// cached services
@ -289,6 +290,7 @@ private:
uint16_t mMaxRequestDelay;
uint16_t mIdleSynTimeout;
bool mPipeliningEnabled;
uint16_t mMaxConnections;
uint8_t mMaxPersistentConnectionsPerServer;
uint8_t mMaxPersistentConnectionsPerProxy;
@ -299,6 +301,7 @@ private:
bool mPipelineRescheduleOnTimeout;
PRIntervalTime mPipelineRescheduleTimeout;
PRIntervalTime mPipelineReadTimeout;
nsCOMPtr<nsITimer> mPipelineTestTimer;
uint8_t mRedirectionLimit;