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gecko/netwerk/base/nsSocketTransportService2.cpp

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// vim:set sw=4 sts=4 et cin:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsSocketTransportService2.h"
#if !defined(MOZILLA_XPCOMRT_API)
#include "nsSocketTransport2.h"
#include "NetworkActivityMonitor.h"
#include "mozilla/Preferences.h"
#endif // !defined(MOZILLA_XPCOMRT_API)
#include "nsASocketHandler.h"
#include "nsError.h"
#include "prnetdb.h"
#include "prerror.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsServiceManagerUtils.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "mozilla/Likely.h"
#include "mozilla/PublicSSL.h"
#include "mozilla/ChaosMode.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Telemetry.h"
#include "nsThreadUtils.h"
#include "nsIFile.h"
using namespace mozilla;
using namespace mozilla::net;
PRLogModuleInfo *gSocketTransportLog = nullptr;
nsSocketTransportService *gSocketTransportService = nullptr;
PRThread *gSocketThread = nullptr;
#define SEND_BUFFER_PREF "network.tcp.sendbuffer"
#define KEEPALIVE_ENABLED_PREF "network.tcp.keepalive.enabled"
#define KEEPALIVE_IDLE_TIME_PREF "network.tcp.keepalive.idle_time"
#define KEEPALIVE_RETRY_INTERVAL_PREF "network.tcp.keepalive.retry_interval"
#define KEEPALIVE_PROBE_COUNT_PREF "network.tcp.keepalive.probe_count"
#define SOCKET_LIMIT_TARGET 550U
#define SOCKET_LIMIT_MIN 50U
#define BLIP_INTERVAL_PREF "network.activity.blipIntervalMilliseconds"
#define SERVE_MULTIPLE_EVENTS_PREF "network.sts.serve_multiple_events_per_poll_iteration"
#define MAX_TIME_BETWEEN_TWO_POLLS "network.sts.max_time_for_events_between_two_polls"
#define TELEMETRY_PREF "toolkit.telemetry.enabled"
uint32_t nsSocketTransportService::gMaxCount;
PRCallOnceType nsSocketTransportService::gMaxCountInitOnce;
//-----------------------------------------------------------------------------
// ctor/dtor (called on the main/UI thread by the service manager)
nsSocketTransportService::nsSocketTransportService()
: mThread(nullptr)
, mThreadEvent(nullptr)
, mAutodialEnabled(false)
, mLock("nsSocketTransportService::mLock")
, mInitialized(false)
, mShuttingDown(false)
, mOffline(false)
, mGoingOffline(false)
, mActiveListSize(SOCKET_LIMIT_MIN)
, mIdleListSize(SOCKET_LIMIT_MIN)
, mActiveCount(0)
, mIdleCount(0)
, mSentBytesCount(0)
, mReceivedBytesCount(0)
, mSendBufferSize(0)
, mKeepaliveIdleTimeS(600)
, mKeepaliveRetryIntervalS(1)
, mKeepaliveProbeCount(kDefaultTCPKeepCount)
, mKeepaliveEnabledPref(false)
, mServeMultipleEventsPerPollIter(true)
, mServingPendingQueue(false)
, mMaxTimePerPollIter(100)
, mTelemetryEnabledPref(false)
, mProbedMaxCount(false)
{
gSocketTransportLog = PR_NewLogModule("nsSocketTransport");
NS_ASSERTION(NS_IsMainThread(), "wrong thread");
PR_CallOnce(&gMaxCountInitOnce, DiscoverMaxCount);
mActiveList = (SocketContext *)
moz_xmalloc(sizeof(SocketContext) * mActiveListSize);
mIdleList = (SocketContext *)
moz_xmalloc(sizeof(SocketContext) * mIdleListSize);
mPollList = (PRPollDesc *)
moz_xmalloc(sizeof(PRPollDesc) * (mActiveListSize + 1));
NS_ASSERTION(!gSocketTransportService, "must not instantiate twice");
gSocketTransportService = this;
}
nsSocketTransportService::~nsSocketTransportService()
{
NS_ASSERTION(NS_IsMainThread(), "wrong thread");
NS_ASSERTION(!mInitialized, "not shutdown properly");
if (mThreadEvent)
PR_DestroyPollableEvent(mThreadEvent);
free(mActiveList);
free(mIdleList);
free(mPollList);
gSocketTransportService = nullptr;
}
//-----------------------------------------------------------------------------
// event queue (any thread)
already_AddRefed<nsIThread>
nsSocketTransportService::GetThreadSafely()
{
MutexAutoLock lock(mLock);
nsCOMPtr<nsIThread> result = mThread;
return result.forget();
}
NS_IMETHODIMP
nsSocketTransportService::Dispatch(nsIRunnable *event, uint32_t flags)
{
SOCKET_LOG(("STS dispatch [%p]\n", event));
nsCOMPtr<nsIThread> thread = GetThreadSafely();
nsresult rv;
rv = thread ? thread->Dispatch(event, flags) : NS_ERROR_NOT_INITIALIZED;
if (rv == NS_ERROR_UNEXPECTED) {
// Thread is no longer accepting events. We must have just shut it
// down on the main thread. Pretend we never saw it.
rv = NS_ERROR_NOT_INITIALIZED;
}
return rv;
}
NS_IMETHODIMP
nsSocketTransportService::IsOnCurrentThread(bool *result)
{
nsCOMPtr<nsIThread> thread = GetThreadSafely();
NS_ENSURE_TRUE(thread, NS_ERROR_NOT_INITIALIZED);
return thread->IsOnCurrentThread(result);
}
//-----------------------------------------------------------------------------
// socket api (socket thread only)
NS_IMETHODIMP
nsSocketTransportService::NotifyWhenCanAttachSocket(nsIRunnable *event)
{
SOCKET_LOG(("nsSocketTransportService::NotifyWhenCanAttachSocket\n"));
NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
if (CanAttachSocket()) {
return Dispatch(event, NS_DISPATCH_NORMAL);
}
mPendingSocketQ.PutEvent(event);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::AttachSocket(PRFileDesc *fd, nsASocketHandler *handler)
{
SOCKET_LOG(("nsSocketTransportService::AttachSocket [handler=%p]\n", handler));
NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
if (!CanAttachSocket()) {
return NS_ERROR_NOT_AVAILABLE;
}
SocketContext sock;
sock.mFD = fd;
sock.mHandler = handler;
sock.mElapsedTime = 0;
nsresult rv = AddToIdleList(&sock);
if (NS_SUCCEEDED(rv))
NS_ADDREF(handler);
return rv;
}
nsresult
nsSocketTransportService::DetachSocket(SocketContext *listHead, SocketContext *sock)
{
SOCKET_LOG(("nsSocketTransportService::DetachSocket [handler=%p]\n", sock->mHandler));
MOZ_ASSERT((listHead == mActiveList) || (listHead == mIdleList),
"DetachSocket invalid head");
// inform the handler that this socket is going away
sock->mHandler->OnSocketDetached(sock->mFD);
mSentBytesCount += sock->mHandler->ByteCountSent();
mReceivedBytesCount += sock->mHandler->ByteCountReceived();
// cleanup
sock->mFD = nullptr;
NS_RELEASE(sock->mHandler);
if (listHead == mActiveList)
RemoveFromPollList(sock);
else
RemoveFromIdleList(sock);
// NOTE: sock is now an invalid pointer
//
// notify the first element on the pending socket queue...
//
nsCOMPtr<nsIRunnable> event;
if (mPendingSocketQ.GetPendingEvent(getter_AddRefs(event))) {
// move event from pending queue to dispatch queue
return Dispatch(event, NS_DISPATCH_NORMAL);
}
return NS_OK;
}
nsresult
nsSocketTransportService::AddToPollList(SocketContext *sock)
{
MOZ_ASSERT(!(static_cast<uint32_t>(sock - mActiveList) < mActiveListSize),
"AddToPollList Socket Already Active");
SOCKET_LOG(("nsSocketTransportService::AddToPollList [handler=%p]\n", sock->mHandler));
if (mActiveCount == mActiveListSize) {
SOCKET_LOG((" Active List size of %d met\n", mActiveCount));
if (!GrowActiveList()) {
NS_ERROR("too many active sockets");
return NS_ERROR_OUT_OF_MEMORY;
}
}
uint32_t newSocketIndex = mActiveCount;
if (ChaosMode::isActive(ChaosMode::NetworkScheduling)) {
newSocketIndex = ChaosMode::randomUint32LessThan(mActiveCount + 1);
PodMove(mActiveList + newSocketIndex + 1, mActiveList + newSocketIndex,
mActiveCount - newSocketIndex);
PodMove(mPollList + newSocketIndex + 2, mPollList + newSocketIndex + 1,
mActiveCount - newSocketIndex);
}
mActiveList[newSocketIndex] = *sock;
mActiveCount++;
mPollList[newSocketIndex + 1].fd = sock->mFD;
mPollList[newSocketIndex + 1].in_flags = sock->mHandler->mPollFlags;
mPollList[newSocketIndex + 1].out_flags = 0;
SOCKET_LOG((" active=%u idle=%u\n", mActiveCount, mIdleCount));
return NS_OK;
}
void
nsSocketTransportService::RemoveFromPollList(SocketContext *sock)
{
SOCKET_LOG(("nsSocketTransportService::RemoveFromPollList [handler=%p]\n", sock->mHandler));
uint32_t index = sock - mActiveList;
MOZ_ASSERT(index < mActiveListSize, "invalid index");
SOCKET_LOG((" index=%u mActiveCount=%u\n", index, mActiveCount));
if (index != mActiveCount-1) {
mActiveList[index] = mActiveList[mActiveCount-1];
mPollList[index+1] = mPollList[mActiveCount];
}
mActiveCount--;
SOCKET_LOG((" active=%u idle=%u\n", mActiveCount, mIdleCount));
}
nsresult
nsSocketTransportService::AddToIdleList(SocketContext *sock)
{
MOZ_ASSERT(!(static_cast<uint32_t>(sock - mIdleList) < mIdleListSize),
"AddToIdlelList Socket Already Idle");
SOCKET_LOG(("nsSocketTransportService::AddToIdleList [handler=%p]\n", sock->mHandler));
if (mIdleCount == mIdleListSize) {
SOCKET_LOG((" Idle List size of %d met\n", mIdleCount));
if (!GrowIdleList()) {
NS_ERROR("too many idle sockets");
return NS_ERROR_OUT_OF_MEMORY;
}
}
mIdleList[mIdleCount] = *sock;
mIdleCount++;
SOCKET_LOG((" active=%u idle=%u\n", mActiveCount, mIdleCount));
return NS_OK;
}
void
nsSocketTransportService::RemoveFromIdleList(SocketContext *sock)
{
SOCKET_LOG(("nsSocketTransportService::RemoveFromIdleList [handler=%p]\n", sock->mHandler));
uint32_t index = sock - mIdleList;
NS_ASSERTION(index < mIdleListSize, "invalid index in idle list");
if (index != mIdleCount-1)
mIdleList[index] = mIdleList[mIdleCount-1];
mIdleCount--;
SOCKET_LOG((" active=%u idle=%u\n", mActiveCount, mIdleCount));
}
void
nsSocketTransportService::MoveToIdleList(SocketContext *sock)
{
nsresult rv = AddToIdleList(sock);
if (NS_FAILED(rv))
DetachSocket(mActiveList, sock);
else
RemoveFromPollList(sock);
}
void
nsSocketTransportService::MoveToPollList(SocketContext *sock)
{
nsresult rv = AddToPollList(sock);
if (NS_FAILED(rv))
DetachSocket(mIdleList, sock);
else
RemoveFromIdleList(sock);
}
bool
nsSocketTransportService::GrowActiveList()
{
int32_t toAdd = gMaxCount - mActiveListSize;
if (toAdd > 100)
toAdd = 100;
if (toAdd < 1)
return false;
mActiveListSize += toAdd;
mActiveList = (SocketContext *)
moz_xrealloc(mActiveList, sizeof(SocketContext) * mActiveListSize);
mPollList = (PRPollDesc *)
moz_xrealloc(mPollList, sizeof(PRPollDesc) * (mActiveListSize + 1));
return true;
}
bool
nsSocketTransportService::GrowIdleList()
{
int32_t toAdd = gMaxCount - mIdleListSize;
if (toAdd > 100)
toAdd = 100;
if (toAdd < 1)
return false;
mIdleListSize += toAdd;
mIdleList = (SocketContext *)
moz_xrealloc(mIdleList, sizeof(SocketContext) * mIdleListSize);
return true;
}
PRIntervalTime
nsSocketTransportService::PollTimeout()
{
if (mActiveCount == 0)
return NS_SOCKET_POLL_TIMEOUT;
// compute minimum time before any socket timeout expires.
uint32_t minR = UINT16_MAX;
for (uint32_t i=0; i<mActiveCount; ++i) {
const SocketContext &s = mActiveList[i];
// mPollTimeout could be less than mElapsedTime if setTimeout
// was called with a value smaller than mElapsedTime.
uint32_t r = (s.mElapsedTime < s.mHandler->mPollTimeout)
? s.mHandler->mPollTimeout - s.mElapsedTime
: 0;
if (r < minR)
minR = r;
}
// nsASocketHandler defines UINT16_MAX as do not timeout
if (minR == UINT16_MAX) {
SOCKET_LOG(("poll timeout: none\n"));
return NS_SOCKET_POLL_TIMEOUT;
}
SOCKET_LOG(("poll timeout: %lu\n", minR));
return PR_SecondsToInterval(minR);
}
int32_t
nsSocketTransportService::Poll(bool wait, uint32_t *interval,
TimeDuration *pollDuration)
{
PRPollDesc *pollList;
uint32_t pollCount;
PRIntervalTime pollTimeout;
*pollDuration = 0;
if (mPollList[0].fd) {
mPollList[0].out_flags = 0;
pollList = mPollList;
pollCount = mActiveCount + 1;
pollTimeout = PollTimeout();
}
else {
// no pollable event, so busy wait...
pollCount = mActiveCount;
if (pollCount)
pollList = &mPollList[1];
else
pollList = nullptr;
pollTimeout = PR_MillisecondsToInterval(25);
}
if (!wait)
pollTimeout = PR_INTERVAL_NO_WAIT;
PRIntervalTime ts = PR_IntervalNow();
TimeStamp pollStart;
if (mTelemetryEnabledPref) {
pollStart = TimeStamp::NowLoRes();
}
SOCKET_LOG((" timeout = %i milliseconds\n",
PR_IntervalToMilliseconds(pollTimeout)));
int32_t rv = PR_Poll(pollList, pollCount, pollTimeout);
PRIntervalTime passedInterval = PR_IntervalNow() - ts;
if (mTelemetryEnabledPref && !pollStart.IsNull()) {
*pollDuration = TimeStamp::NowLoRes() - pollStart;
}
SOCKET_LOG((" ...returned after %i milliseconds\n",
PR_IntervalToMilliseconds(passedInterval)));
*interval = PR_IntervalToSeconds(passedInterval);
return rv;
}
//-----------------------------------------------------------------------------
// xpcom api
NS_IMPL_ISUPPORTS(nsSocketTransportService,
nsISocketTransportService,
nsIRoutedSocketTransportService,
nsIEventTarget,
nsIThreadObserver,
nsIRunnable,
nsPISocketTransportService,
nsIObserver)
// called from main thread only
NS_IMETHODIMP
nsSocketTransportService::Init()
{
if (!NS_IsMainThread()) {
NS_ERROR("wrong thread");
return NS_ERROR_UNEXPECTED;
}
if (mInitialized)
return NS_OK;
if (mShuttingDown)
return NS_ERROR_UNEXPECTED;
if (!mThreadEvent) {
mThreadEvent = PR_NewPollableEvent();
//
// NOTE: per bug 190000, this failure could be caused by Zone-Alarm
// or similar software.
//
// NOTE: per bug 191739, this failure could also be caused by lack
// of a loopback device on Windows and OS/2 platforms (NSPR creates
// a loopback socket pair on these platforms to implement a pollable
// event object). if we can't create a pollable event, then we'll
// have to "busy wait" to implement the socket event queue :-(
//
if (!mThreadEvent) {
NS_WARNING("running socket transport thread without a pollable event");
SOCKET_LOG(("running socket transport thread without a pollable event"));
}
}
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_NewThread(getter_AddRefs(thread), this);
if (NS_FAILED(rv)) return rv;
{
MutexAutoLock lock(mLock);
// Install our mThread, protecting against concurrent readers
thread.swap(mThread);
}
nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (tmpPrefService) {
tmpPrefService->AddObserver(SEND_BUFFER_PREF, this, false);
tmpPrefService->AddObserver(KEEPALIVE_ENABLED_PREF, this, false);
tmpPrefService->AddObserver(KEEPALIVE_IDLE_TIME_PREF, this, false);
tmpPrefService->AddObserver(KEEPALIVE_RETRY_INTERVAL_PREF, this, false);
tmpPrefService->AddObserver(KEEPALIVE_PROBE_COUNT_PREF, this, false);
tmpPrefService->AddObserver(SERVE_MULTIPLE_EVENTS_PREF, this, false);
tmpPrefService->AddObserver(MAX_TIME_BETWEEN_TWO_POLLS, this, false);
tmpPrefService->AddObserver(TELEMETRY_PREF, this, false);
}
UpdatePrefs();
nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
if (obsSvc) {
obsSvc->AddObserver(this, "profile-initial-state", false);
obsSvc->AddObserver(this, "last-pb-context-exited", false);
}
mInitialized = true;
return NS_OK;
}
// called from main thread only
NS_IMETHODIMP
nsSocketTransportService::Shutdown()
{
SOCKET_LOG(("nsSocketTransportService::Shutdown\n"));
NS_ENSURE_STATE(NS_IsMainThread());
if (!mInitialized)
return NS_OK;
if (mShuttingDown)
return NS_ERROR_UNEXPECTED;
{
MutexAutoLock lock(mLock);
// signal the socket thread to shutdown
mShuttingDown = true;
if (mThreadEvent)
PR_SetPollableEvent(mThreadEvent);
// else wait for Poll timeout
}
// join with thread
mThread->Shutdown();
{
MutexAutoLock lock(mLock);
// Drop our reference to mThread and make sure that any concurrent
// readers are excluded
mThread = nullptr;
}
nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (tmpPrefService)
tmpPrefService->RemoveObserver(SEND_BUFFER_PREF, this);
nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
if (obsSvc) {
obsSvc->RemoveObserver(this, "profile-initial-state");
obsSvc->RemoveObserver(this, "last-pb-context-exited");
}
#if !defined(MOZILLA_XPCOMRT_API)
mozilla::net::NetworkActivityMonitor::Shutdown();
#endif // !defined(MOZILLA_XPCOMRT_API)
mInitialized = false;
mShuttingDown = false;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetOffline(bool *offline)
{
*offline = mOffline;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::SetOffline(bool offline)
{
MutexAutoLock lock(mLock);
if (!mOffline && offline) {
// signal the socket thread to go offline, so it will detach sockets
mGoingOffline = true;
mOffline = true;
}
else if (mOffline && !offline) {
mOffline = false;
}
if (mThreadEvent)
PR_SetPollableEvent(mThreadEvent);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveIdleTime(int32_t *aKeepaliveIdleTimeS)
{
MOZ_ASSERT(aKeepaliveIdleTimeS);
if (NS_WARN_IF(!aKeepaliveIdleTimeS)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveIdleTimeS = mKeepaliveIdleTimeS;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveRetryInterval(int32_t *aKeepaliveRetryIntervalS)
{
MOZ_ASSERT(aKeepaliveRetryIntervalS);
if (NS_WARN_IF(!aKeepaliveRetryIntervalS)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveRetryIntervalS = mKeepaliveRetryIntervalS;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveProbeCount(int32_t *aKeepaliveProbeCount)
{
MOZ_ASSERT(aKeepaliveProbeCount);
if (NS_WARN_IF(!aKeepaliveProbeCount)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveProbeCount = mKeepaliveProbeCount;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::CreateTransport(const char **types,
uint32_t typeCount,
const nsACString &host,
int32_t port,
nsIProxyInfo *proxyInfo,
nsISocketTransport **result)
{
return CreateRoutedTransport(types, typeCount, host, port, NS_LITERAL_CSTRING(""), 0,
proxyInfo, result);
}
NS_IMETHODIMP
nsSocketTransportService::CreateRoutedTransport(const char **types,
uint32_t typeCount,
const nsACString &host,
int32_t port,
const nsACString &hostRoute,
int32_t portRoute,
nsIProxyInfo *proxyInfo,
nsISocketTransport **result)
{
#if defined(MOZILLA_XPCOMRT_API)
NS_WARNING("nsSocketTransportService::CreateTransport not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
NS_ENSURE_TRUE(port >= 0 && port <= 0xFFFF, NS_ERROR_ILLEGAL_VALUE);
nsRefPtr<nsSocketTransport> trans = new nsSocketTransport();
nsresult rv = trans->Init(types, typeCount, host, port, hostRoute, portRoute, proxyInfo);
if (NS_FAILED(rv)) {
return rv;
}
trans.forget(result);
return NS_OK;
#endif // defined(MOZILLA_XPCOMRT_API)
}
NS_IMETHODIMP
nsSocketTransportService::CreateUnixDomainTransport(nsIFile *aPath,
nsISocketTransport **result)
{
#if defined(MOZILLA_XPCOMRT_API)
NS_WARNING("nsSocketTransportService::CreateUnixDomainTransport not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
nsresult rv;
NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
nsAutoCString path;
rv = aPath->GetNativePath(path);
if (NS_FAILED(rv))
return rv;
nsRefPtr<nsSocketTransport> trans = new nsSocketTransport();
rv = trans->InitWithFilename(path.get());
if (NS_FAILED(rv))
return rv;
trans.forget(result);
return NS_OK;
#endif // defined(MOZILLA_XPCOMRT_API)
}
NS_IMETHODIMP
nsSocketTransportService::GetAutodialEnabled(bool *value)
{
*value = mAutodialEnabled;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::SetAutodialEnabled(bool value)
{
mAutodialEnabled = value;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::OnDispatchedEvent(nsIThreadInternal *thread)
{
MutexAutoLock lock(mLock);
if (mThreadEvent)
PR_SetPollableEvent(mThreadEvent);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::OnProcessNextEvent(nsIThreadInternal *thread,
bool mayWait, uint32_t depth)
{
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::AfterProcessNextEvent(nsIThreadInternal* thread,
uint32_t depth,
bool eventWasProcessed)
{
return NS_OK;
}
void
nsSocketTransportService::MarkTheLastElementOfPendingQueue()
{
mServingPendingQueue = false;
}
#ifdef MOZ_NUWA_PROCESS
#include "ipc/Nuwa.h"
#endif
NS_IMETHODIMP
nsSocketTransportService::Run()
{
PR_SetCurrentThreadName("Socket Thread");
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
NuwaMarkCurrentThread(nullptr, nullptr);
}
#endif
SOCKET_LOG(("STS thread init\n"));
#if !defined(MOZILLA_XPCOMRT_API)
psm::InitializeSSLServerCertVerificationThreads();
#endif // !defined(MOZILLA_XPCOMRT_API)
gSocketThread = PR_GetCurrentThread();
// add thread event to poll list (mThreadEvent may be nullptr)
mPollList[0].fd = mThreadEvent;
mPollList[0].in_flags = PR_POLL_READ;
mPollList[0].out_flags = 0;
nsIThread *thread = NS_GetCurrentThread();
// hook ourselves up to observe event processing for this thread
nsCOMPtr<nsIThreadInternal> threadInt = do_QueryInterface(thread);
threadInt->SetObserver(this);
// make sure the pseudo random number generator is seeded on this thread
srand(static_cast<unsigned>(PR_Now()));
// For the calculation of the duration of the last cycle (i.e. the last for-loop
// iteration before shutdown).
TimeStamp startOfCycleForLastCycleCalc;
int numberOfPendingEventsLastCycle;
// For measuring of the poll iteration duration without time spent blocked
// in poll().
TimeStamp pollCycleStart;
// Time blocked in poll().
TimeDuration singlePollDuration;
// For calculating the time needed for a new element to run.
TimeStamp startOfIteration;
TimeStamp startOfNextIteration;
int numberOfPendingEvents;
// If there is too many pending events queued, we will run some poll()
// between them and the following variable is cumulative time spent
// blocking in poll().
TimeDuration pollDuration;
for (;;) {
bool pendingEvents = false;
thread->HasPendingEvents(&pendingEvents);
numberOfPendingEvents = 0;
numberOfPendingEventsLastCycle = 0;
if (mTelemetryEnabledPref) {
startOfCycleForLastCycleCalc = TimeStamp::NowLoRes();
startOfNextIteration = TimeStamp::NowLoRes();
}
pollDuration = 0;
do {
if (mTelemetryEnabledPref) {
pollCycleStart = TimeStamp::NowLoRes();
}
// If there are pending events for this thread then
// DoPollIteration() should service the network without blocking.
DoPollIteration(!pendingEvents, &singlePollDuration);
if (mTelemetryEnabledPref && !pollCycleStart.IsNull()) {
Telemetry::Accumulate(Telemetry::STS_POLL_BLOCK_TIME,
singlePollDuration.ToMilliseconds());
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_CYCLE,
pollCycleStart + singlePollDuration,
TimeStamp::NowLoRes());
pollDuration += singlePollDuration;
}
// If nothing was pending before the poll, it might be now
if (!pendingEvents) {
thread->HasPendingEvents(&pendingEvents);
}
if (pendingEvents) {
if (mServeMultipleEventsPerPollIter) {
if (!mServingPendingQueue) {
nsresult rv = Dispatch(NS_NewRunnableMethod(this,
&nsSocketTransportService::MarkTheLastElementOfPendingQueue),
nsIEventTarget::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Could not dispatch a new event on the "
"socket thread.");
} else {
mServingPendingQueue = true;
}
if (mTelemetryEnabledPref) {
startOfIteration = startOfNextIteration;
// Everything that comes after this point will
// be served in the next iteration. If no even
// arrives, startOfNextIteration will be reset at the
// beginning of each for-loop.
startOfNextIteration = TimeStamp::NowLoRes();
}
}
TimeStamp eventQueueStart = TimeStamp::NowLoRes();
do {
NS_ProcessNextEvent(thread);
numberOfPendingEvents++;
pendingEvents = false;
thread->HasPendingEvents(&pendingEvents);
} while (pendingEvents && mServingPendingQueue &&
((TimeStamp::NowLoRes() -
eventQueueStart).ToMilliseconds() <
mMaxTimePerPollIter));
if (mTelemetryEnabledPref && !mServingPendingQueue &&
!startOfIteration.IsNull()) {
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_AND_EVENTS_CYCLE,
startOfIteration + pollDuration,
TimeStamp::NowLoRes());
Telemetry::Accumulate(
Telemetry::STS_NUMBER_OF_PENDING_EVENTS,
numberOfPendingEvents);
numberOfPendingEventsLastCycle += numberOfPendingEvents;
numberOfPendingEvents = 0;
pollDuration = 0;
}
} else {
NS_ProcessNextEvent(thread);
pendingEvents = false;
thread->HasPendingEvents(&pendingEvents);
}
}
} while (pendingEvents);
bool goingOffline = false;
// now that our event queue is empty, check to see if we should exit
{
MutexAutoLock lock(mLock);
if (mShuttingDown) {
if (mTelemetryEnabledPref &&
!startOfCycleForLastCycleCalc.IsNull()) {
Telemetry::Accumulate(
Telemetry::STS_NUMBER_OF_PENDING_EVENTS_IN_THE_LAST_CYCLE,
numberOfPendingEventsLastCycle);
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_AND_EVENT_THE_LAST_CYCLE,
startOfCycleForLastCycleCalc,
TimeStamp::NowLoRes());
}
break;
}
if (mGoingOffline) {
mGoingOffline = false;
goingOffline = true;
}
}
// Avoid potential deadlock
if (goingOffline)
Reset(true);
}
SOCKET_LOG(("STS shutting down thread\n"));
// detach all sockets, including locals
Reset(false);
// Final pass over the event queue. This makes sure that events posted by
// socket detach handlers get processed.
NS_ProcessPendingEvents(thread);
gSocketThread = nullptr;
#if !defined(MOZILLA_XPCOMRT_API)
psm::StopSSLServerCertVerificationThreads();
#endif // !defined(MOZILLA_XPCOMRT_API)
SOCKET_LOG(("STS thread exit\n"));
return NS_OK;
}
void
nsSocketTransportService::DetachSocketWithGuard(bool aGuardLocals,
SocketContext *socketList,
int32_t index)
{
bool isGuarded = false;
if (aGuardLocals) {
socketList[index].mHandler->IsLocal(&isGuarded);
if (!isGuarded)
socketList[index].mHandler->KeepWhenOffline(&isGuarded);
}
if (!isGuarded)
DetachSocket(socketList, &socketList[index]);
}
void
nsSocketTransportService::Reset(bool aGuardLocals)
{
// detach any sockets
int32_t i;
for (i = mActiveCount - 1; i >= 0; --i) {
DetachSocketWithGuard(aGuardLocals, mActiveList, i);
}
for (i = mIdleCount - 1; i >= 0; --i) {
DetachSocketWithGuard(aGuardLocals, mIdleList, i);
}
}
nsresult
nsSocketTransportService::DoPollIteration(bool wait, TimeDuration *pollDuration)
{
SOCKET_LOG(("STS poll iter [%d]\n", wait));
int32_t i, count;
//
// poll loop
//
// walk active list backwards to see if any sockets should actually be
// idle, then walk the idle list backwards to see if any idle sockets
// should become active. take care to check only idle sockets that
// were idle to begin with ;-)
//
count = mIdleCount;
for (i=mActiveCount-1; i>=0; --i) {
//---
SOCKET_LOG((" active [%u] { handler=%p condition=%x pollflags=%hu }\n", i,
mActiveList[i].mHandler,
mActiveList[i].mHandler->mCondition,
mActiveList[i].mHandler->mPollFlags));
//---
if (NS_FAILED(mActiveList[i].mHandler->mCondition))
DetachSocket(mActiveList, &mActiveList[i]);
else {
uint16_t in_flags = mActiveList[i].mHandler->mPollFlags;
if (in_flags == 0)
MoveToIdleList(&mActiveList[i]);
else {
// update poll flags
mPollList[i+1].in_flags = in_flags;
mPollList[i+1].out_flags = 0;
}
}
}
for (i=count-1; i>=0; --i) {
//---
SOCKET_LOG((" idle [%u] { handler=%p condition=%x pollflags=%hu }\n", i,
mIdleList[i].mHandler,
mIdleList[i].mHandler->mCondition,
mIdleList[i].mHandler->mPollFlags));
//---
if (NS_FAILED(mIdleList[i].mHandler->mCondition))
DetachSocket(mIdleList, &mIdleList[i]);
else if (mIdleList[i].mHandler->mPollFlags != 0)
MoveToPollList(&mIdleList[i]);
}
SOCKET_LOG((" calling PR_Poll [active=%u idle=%u]\n", mActiveCount, mIdleCount));
#if defined(XP_WIN)
// 30 active connections is the historic limit before firefox 7's 256. A few
// windows systems have troubles with the higher limit, so actively probe a
// limit the first time we exceed 30.
if ((mActiveCount > 30) && !mProbedMaxCount)
ProbeMaxCount();
#endif
// Measures seconds spent while blocked on PR_Poll
uint32_t pollInterval;
int32_t n = Poll(wait, &pollInterval, pollDuration);
if (n < 0) {
SOCKET_LOG((" PR_Poll error [%d] os error [%d]\n", PR_GetError(),
PR_GetOSError()));
}
else {
//
// service "active" sockets...
//
uint32_t numberOfOnSocketReadyCalls = 0;
for (i=0; i<int32_t(mActiveCount); ++i) {
PRPollDesc &desc = mPollList[i+1];
SocketContext &s = mActiveList[i];
if (n > 0 && desc.out_flags != 0) {
s.mElapsedTime = 0;
s.mHandler->OnSocketReady(desc.fd, desc.out_flags);
numberOfOnSocketReadyCalls++;
}
// check for timeout errors unless disabled...
else if (s.mHandler->mPollTimeout != UINT16_MAX) {
// update elapsed time counter
// (NOTE: We explicitly cast UINT16_MAX to be an unsigned value
// here -- otherwise, some compilers will treat it as signed,
// which makes them fire signed/unsigned-comparison build
// warnings for the comparison against 'pollInterval'.)
if (MOZ_UNLIKELY(pollInterval >
static_cast<uint32_t>(UINT16_MAX) -
s.mElapsedTime))
s.mElapsedTime = UINT16_MAX;
else
s.mElapsedTime += uint16_t(pollInterval);
// check for timeout expiration
if (s.mElapsedTime >= s.mHandler->mPollTimeout) {
s.mElapsedTime = 0;
s.mHandler->OnSocketReady(desc.fd, -1);
numberOfOnSocketReadyCalls++;
}
}
}
if (mTelemetryEnabledPref) {
Telemetry::Accumulate(
Telemetry::STS_NUMBER_OF_ONSOCKETREADY_CALLS,
numberOfOnSocketReadyCalls);
}
//
// check for "dead" sockets and remove them (need to do this in
// reverse order obviously).
//
for (i=mActiveCount-1; i>=0; --i) {
if (NS_FAILED(mActiveList[i].mHandler->mCondition))
DetachSocket(mActiveList, &mActiveList[i]);
}
if (n != 0 && mPollList[0].out_flags == PR_POLL_READ) {
// acknowledge pollable event (wait should not block)
if (PR_WaitForPollableEvent(mThreadEvent) != PR_SUCCESS) {
// On Windows, the TCP loopback connection in the
// pollable event may become broken when a laptop
// switches between wired and wireless networks or
// wakes up from hibernation. We try to create a
// new pollable event. If that fails, we fall back
// on "busy wait".
{
MutexAutoLock lock(mLock);
PR_DestroyPollableEvent(mThreadEvent);
mThreadEvent = PR_NewPollableEvent();
}
if (!mThreadEvent) {
NS_WARNING("running socket transport thread without "
"a pollable event");
SOCKET_LOG(("running socket transport thread without "
"a pollable event"));
}
mPollList[0].fd = mThreadEvent;
// mPollList[0].in_flags was already set to PR_POLL_READ
// in Run().
mPollList[0].out_flags = 0;
}
}
}
return NS_OK;
}
nsresult
nsSocketTransportService::UpdatePrefs()
{
#if defined(MOZILLA_XPCOMRT_API)
NS_WARNING("nsSocketTransportService::UpdatePrefs not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
mSendBufferSize = 0;
nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (tmpPrefService) {
int32_t bufferSize;
nsresult rv = tmpPrefService->GetIntPref(SEND_BUFFER_PREF, &bufferSize);
if (NS_SUCCEEDED(rv) && bufferSize > 0)
mSendBufferSize = bufferSize;
// Default TCP Keepalive Values.
int32_t keepaliveIdleTimeS;
rv = tmpPrefService->GetIntPref(KEEPALIVE_IDLE_TIME_PREF,
&keepaliveIdleTimeS);
if (NS_SUCCEEDED(rv))
mKeepaliveIdleTimeS = clamped(keepaliveIdleTimeS,
1, kMaxTCPKeepIdle);
int32_t keepaliveRetryIntervalS;
rv = tmpPrefService->GetIntPref(KEEPALIVE_RETRY_INTERVAL_PREF,
&keepaliveRetryIntervalS);
if (NS_SUCCEEDED(rv))
mKeepaliveRetryIntervalS = clamped(keepaliveRetryIntervalS,
1, kMaxTCPKeepIntvl);
int32_t keepaliveProbeCount;
rv = tmpPrefService->GetIntPref(KEEPALIVE_PROBE_COUNT_PREF,
&keepaliveProbeCount);
if (NS_SUCCEEDED(rv))
mKeepaliveProbeCount = clamped(keepaliveProbeCount,
1, kMaxTCPKeepCount);
bool keepaliveEnabled = false;
rv = tmpPrefService->GetBoolPref(KEEPALIVE_ENABLED_PREF,
&keepaliveEnabled);
if (NS_SUCCEEDED(rv) && keepaliveEnabled != mKeepaliveEnabledPref) {
mKeepaliveEnabledPref = keepaliveEnabled;
OnKeepaliveEnabledPrefChange();
}
bool serveMultiplePref = false;
rv = tmpPrefService->GetBoolPref(SERVE_MULTIPLE_EVENTS_PREF,
&serveMultiplePref);
if (NS_SUCCEEDED(rv)) {
mServeMultipleEventsPerPollIter = serveMultiplePref;
}
int32_t maxTimePref;
rv = tmpPrefService->GetIntPref(MAX_TIME_BETWEEN_TWO_POLLS,
&maxTimePref);
if (NS_SUCCEEDED(rv) && maxTimePref >= 0) {
mMaxTimePerPollIter = maxTimePref;
}
bool telemetryPref = false;
rv = tmpPrefService->GetBoolPref(TELEMETRY_PREF,
&telemetryPref);
if (NS_SUCCEEDED(rv)) {
mTelemetryEnabledPref = telemetryPref;
}
}
return NS_OK;
#endif // defined(MOZILLA_XPCOMRT_API)
}
void
nsSocketTransportService::OnKeepaliveEnabledPrefChange()
{
// Dispatch to socket thread if we're not executing there.
if (PR_GetCurrentThread() != gSocketThread) {
gSocketTransportService->Dispatch(
NS_NewRunnableMethod(
this, &nsSocketTransportService::OnKeepaliveEnabledPrefChange),
NS_DISPATCH_NORMAL);
return;
}
SOCKET_LOG(("nsSocketTransportService::OnKeepaliveEnabledPrefChange %s",
mKeepaliveEnabledPref ? "enabled" : "disabled"));
// Notify each socket that keepalive has been en/disabled globally.
for (int32_t i = mActiveCount - 1; i >= 0; --i) {
NotifyKeepaliveEnabledPrefChange(&mActiveList[i]);
}
for (int32_t i = mIdleCount - 1; i >= 0; --i) {
NotifyKeepaliveEnabledPrefChange(&mIdleList[i]);
}
}
void
nsSocketTransportService::NotifyKeepaliveEnabledPrefChange(SocketContext *sock)
{
MOZ_ASSERT(sock, "SocketContext cannot be null!");
MOZ_ASSERT(sock->mHandler, "SocketContext does not have a handler!");
if (!sock || !sock->mHandler) {
return;
}
sock->mHandler->OnKeepaliveEnabledPrefChange(mKeepaliveEnabledPref);
}
NS_IMETHODIMP
nsSocketTransportService::Observe(nsISupports *subject,
const char *topic,
const char16_t *data)
{
#if !defined(MOZILLA_XPCOMRT_API)
if (!strcmp(topic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
UpdatePrefs();
return NS_OK;
}
if (!strcmp(topic, "profile-initial-state")) {
int32_t blipInterval = Preferences::GetInt(BLIP_INTERVAL_PREF, 0);
if (blipInterval <= 0) {
return NS_OK;
}
return net::NetworkActivityMonitor::Init(blipInterval);
}
#endif // !defined(MOZILLA_XPCOMRT_API)
if (!strcmp(topic, "last-pb-context-exited")) {
nsCOMPtr<nsIRunnable> ev =
NS_NewRunnableMethod(this,
&nsSocketTransportService::ClosePrivateConnections);
nsresult rv = Dispatch(ev, nsIEventTarget::DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
void
nsSocketTransportService::ClosePrivateConnections()
{
// Must be called on the socket thread.
#ifdef DEBUG
bool onSTSThread;
IsOnCurrentThread(&onSTSThread);
MOZ_ASSERT(onSTSThread);
#endif
for (int32_t i = mActiveCount - 1; i >= 0; --i) {
if (mActiveList[i].mHandler->mIsPrivate) {
DetachSocket(mActiveList, &mActiveList[i]);
}
}
for (int32_t i = mIdleCount - 1; i >= 0; --i) {
if (mIdleList[i].mHandler->mIsPrivate) {
DetachSocket(mIdleList, &mIdleList[i]);
}
}
#if !defined(MOZILLA_XPCOMRT_API)
mozilla::ClearPrivateSSLState();
#endif // !defined(MOZILLA_XPCOMRT_API)
}
NS_IMETHODIMP
nsSocketTransportService::GetSendBufferSize(int32_t *value)
{
*value = mSendBufferSize;
return NS_OK;
}
/// ugly OS specific includes are placed at the bottom of the src for clarity
#if defined(XP_WIN)
#include <windows.h>
#elif defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
#include <sys/resource.h>
#endif
// Right now the only need to do this is on windows.
#if defined(XP_WIN)
void
nsSocketTransportService::ProbeMaxCount()
{
NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
if (mProbedMaxCount)
return;
mProbedMaxCount = true;
// Allocate and test a PR_Poll up to the gMaxCount number of unconnected
// sockets. See bug 692260 - windows should be able to handle 1000 sockets
// in select() without a problem, but LSPs have been known to balk at lower
// numbers. (64 in the bug).
// Allocate
struct PRPollDesc pfd[SOCKET_LIMIT_TARGET];
uint32_t numAllocated = 0;
for (uint32_t index = 0 ; index < gMaxCount; ++index) {
pfd[index].in_flags = PR_POLL_READ | PR_POLL_WRITE | PR_POLL_EXCEPT;
pfd[index].out_flags = 0;
pfd[index].fd = PR_OpenTCPSocket(PR_AF_INET);
if (!pfd[index].fd) {
SOCKET_LOG(("Socket Limit Test index %d failed\n", index));
if (index < SOCKET_LIMIT_MIN)
gMaxCount = SOCKET_LIMIT_MIN;
else
gMaxCount = index;
break;
}
++numAllocated;
}
// Test
PR_STATIC_ASSERT(SOCKET_LIMIT_MIN >= 32U);
while (gMaxCount <= numAllocated) {
int32_t rv = PR_Poll(pfd, gMaxCount, PR_MillisecondsToInterval(0));
SOCKET_LOG(("Socket Limit Test poll() size=%d rv=%d\n",
gMaxCount, rv));
if (rv >= 0)
break;
SOCKET_LOG(("Socket Limit Test poll confirmationSize=%d rv=%d error=%d\n",
gMaxCount, rv, PR_GetError()));
gMaxCount -= 32;
if (gMaxCount <= SOCKET_LIMIT_MIN) {
gMaxCount = SOCKET_LIMIT_MIN;
break;
}
}
// Free
for (uint32_t index = 0 ; index < numAllocated; ++index)
if (pfd[index].fd)
PR_Close(pfd[index].fd);
SOCKET_LOG(("Socket Limit Test max was confirmed at %d\n", gMaxCount));
}
#endif // windows
PRStatus
nsSocketTransportService::DiscoverMaxCount()
{
gMaxCount = SOCKET_LIMIT_MIN;
#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
// On unix and os x network sockets and file
// descriptors are the same. OS X comes defaulted at 256,
// most linux at 1000. We can reliably use [sg]rlimit to
// query that and raise it. We will try to raise it 250 past
// our target number of SOCKET_LIMIT_TARGET so that some descriptors
// are still available for other things.
struct rlimit rlimitData;
if (getrlimit(RLIMIT_NOFILE, &rlimitData) == -1)
return PR_SUCCESS;
if (rlimitData.rlim_cur >= SOCKET_LIMIT_TARGET + 250) {
gMaxCount = SOCKET_LIMIT_TARGET;
return PR_SUCCESS;
}
int32_t maxallowed = rlimitData.rlim_max;
if (maxallowed == -1) { /* no limit */
maxallowed = SOCKET_LIMIT_TARGET + 250;
} else if ((uint32_t)maxallowed < SOCKET_LIMIT_MIN + 250) {
return PR_SUCCESS;
} else if ((uint32_t)maxallowed > SOCKET_LIMIT_TARGET + 250) {
maxallowed = SOCKET_LIMIT_TARGET + 250;
}
rlimitData.rlim_cur = maxallowed;
setrlimit(RLIMIT_NOFILE, &rlimitData);
if (getrlimit(RLIMIT_NOFILE, &rlimitData) != -1)
if (rlimitData.rlim_cur > SOCKET_LIMIT_MIN + 250)
gMaxCount = rlimitData.rlim_cur - 250;
#elif defined(XP_WIN) && !defined(WIN_CE)
// >= XP is confirmed to have at least 1000
gMaxCount = SOCKET_LIMIT_TARGET;
#else
// other platforms are harder to test - so leave at safe legacy value
#endif
return PR_SUCCESS;
}
// Used to return connection info to Dashboard.cpp
void
nsSocketTransportService::AnalyzeConnection(nsTArray<SocketInfo> *data,
struct SocketContext *context, bool aActive)
{
if (context->mHandler->mIsPrivate)
return;
PRFileDesc *aFD = context->mFD;
bool tcp = (PR_GetDescType(aFD) == PR_DESC_SOCKET_TCP);
PRNetAddr peer_addr;
PR_GetPeerName(aFD, &peer_addr);
char host[64] = {0};
PR_NetAddrToString(&peer_addr, host, sizeof(host));
uint16_t port;
if (peer_addr.raw.family == PR_AF_INET)
port = peer_addr.inet.port;
else
port = peer_addr.ipv6.port;
port = PR_ntohs(port);
uint64_t sent = context->mHandler->ByteCountSent();
uint64_t received = context->mHandler->ByteCountReceived();
SocketInfo info = { nsCString(host), sent, received, port, aActive, tcp };
data->AppendElement(info);
}
void
nsSocketTransportService::GetSocketConnections(nsTArray<SocketInfo> *data)
{
NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
for (uint32_t i = 0; i < mActiveCount; i++)
AnalyzeConnection(data, &mActiveList[i], true);
for (uint32_t i = 0; i < mIdleCount; i++)
AnalyzeConnection(data, &mIdleList[i], false);
}
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