tenfourfox/xpcom/base/nsConsoleService.cpp

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2017-04-19 07:56:45 +00:00
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
/*
* Maintains a circular buffer of recent messages, and notifies
* listeners when new messages are logged.
*/
/* Threadsafe. */
#include "nsMemory.h"
#include "nsCOMArray.h"
#include "nsThreadUtils.h"
#include "nsConsoleService.h"
#include "nsConsoleMessage.h"
#include "nsIClassInfoImpl.h"
#include "nsIConsoleListener.h"
#include "nsPrintfCString.h"
#include "nsProxyRelease.h"
#include "nsIScriptError.h"
#include "nsISupportsPrimitives.h"
#include "mozilla/Preferences.h"
#if defined(ANDROID)
#include <android/log.h>
#include "mozilla/dom/ContentChild.h"
#endif
#ifdef XP_WIN
#include <windows.h>
#endif
#ifdef MOZ_TASK_TRACER
#include "GeckoTaskTracer.h"
using namespace mozilla::tasktracer;
#endif
using namespace mozilla;
NS_IMPL_ADDREF(nsConsoleService)
NS_IMPL_RELEASE(nsConsoleService)
NS_IMPL_CLASSINFO(nsConsoleService, nullptr,
nsIClassInfo::THREADSAFE | nsIClassInfo::SINGLETON,
NS_CONSOLESERVICE_CID)
NS_IMPL_QUERY_INTERFACE_CI(nsConsoleService, nsIConsoleService, nsIObserver)
NS_IMPL_CI_INTERFACE_GETTER(nsConsoleService, nsIConsoleService, nsIObserver)
static bool sLoggingEnabled = true;
static bool sLoggingBuffered = true;
#if defined(ANDROID)
static bool sLoggingLogcat = true;
#endif // defined(ANDROID)
nsConsoleService::MessageElement::~MessageElement()
{
}
nsConsoleService::nsConsoleService()
: mCurrentSize(0)
, mDeliveringMessage(false)
, mLock("nsConsoleService.mLock")
{
// XXX grab this from a pref!
// hm, but worry about circularity, bc we want to be able to report
// prefs errs...
mMaximumSize = 250;
}
void
nsConsoleService::ClearMessagesForWindowID(const uint64_t innerID)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mLock);
for (MessageElement* e = mMessages.getFirst(); e != nullptr; ) {
// Only messages implementing nsIScriptError interface expose the
// inner window ID.
nsCOMPtr<nsIScriptError> scriptError = do_QueryInterface(e->Get());
if (!scriptError) {
e = e->getNext();
continue;
}
uint64_t innerWindowID;
nsresult rv = scriptError->GetInnerWindowID(&innerWindowID);
if (NS_FAILED(rv) || innerWindowID != innerID) {
e = e->getNext();
continue;
}
MessageElement* next = e->getNext();
e->remove();
delete e;
mCurrentSize--;
MOZ_ASSERT(mCurrentSize < mMaximumSize);
e = next;
}
}
void
nsConsoleService::ClearMessages()
{
// NB: A lock is not required here as it's only called from |Reset| which
// locks for us and from the dtor.
while (!mMessages.isEmpty()) {
MessageElement* e = mMessages.popFirst();
delete e;
}
mCurrentSize = 0;
}
nsConsoleService::~nsConsoleService()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
ClearMessages();
}
class AddConsolePrefWatchers : public nsRunnable
{
public:
explicit AddConsolePrefWatchers(nsConsoleService* aConsole) : mConsole(aConsole)
{
}
NS_IMETHOD Run()
{
Preferences::AddBoolVarCache(&sLoggingEnabled, "consoleservice.enabled", true);
Preferences::AddBoolVarCache(&sLoggingBuffered, "consoleservice.buffered", true);
#if defined(ANDROID)
Preferences::AddBoolVarCache(&sLoggingLogcat, "consoleservice.logcat", true);
#endif // defined(ANDROID)
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
MOZ_ASSERT(obs);
obs->AddObserver(mConsole, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
obs->AddObserver(mConsole, "inner-window-destroyed", false);
if (!sLoggingBuffered) {
mConsole->Reset();
}
return NS_OK;
}
private:
RefPtr<nsConsoleService> mConsole;
};
nsresult
nsConsoleService::Init()
{
NS_DispatchToMainThread(new AddConsolePrefWatchers(this));
return NS_OK;
}
namespace {
class LogMessageRunnable : public nsRunnable
{
public:
LogMessageRunnable(nsIConsoleMessage* aMessage, nsConsoleService* aService)
: mMessage(aMessage)
, mService(aService)
{ }
NS_DECL_NSIRUNNABLE
private:
nsCOMPtr<nsIConsoleMessage> mMessage;
RefPtr<nsConsoleService> mService;
};
NS_IMETHODIMP
LogMessageRunnable::Run()
{
MOZ_ASSERT(NS_IsMainThread());
// Snapshot of listeners so that we don't reenter this hash during
// enumeration.
nsCOMArray<nsIConsoleListener> listeners;
mService->CollectCurrentListeners(listeners);
mService->SetIsDelivering();
for (int32_t i = 0; i < listeners.Count(); ++i) {
listeners[i]->Observe(mMessage);
}
mService->SetDoneDelivering();
return NS_OK;
}
} // namespace
// nsIConsoleService methods
NS_IMETHODIMP
nsConsoleService::LogMessage(nsIConsoleMessage* aMessage)
{
return LogMessageWithMode(aMessage, OutputToLog);
}
// This can be called off the main thread.
nsresult
nsConsoleService::LogMessageWithMode(nsIConsoleMessage* aMessage,
nsConsoleService::OutputMode aOutputMode)
{
if (!aMessage) {
return NS_ERROR_INVALID_ARG;
}
if (!sLoggingEnabled) {
return NS_OK;
}
if (NS_IsMainThread() && mDeliveringMessage) {
nsCString msg;
aMessage->ToString(msg);
NS_WARNING(nsPrintfCString("Reentrancy error: some client attempted "
"to display a message to the console while in a console listener. "
"The following message was discarded: \"%s\"", msg.get()).get());
return NS_ERROR_FAILURE;
}
RefPtr<LogMessageRunnable> r;
nsCOMPtr<nsIConsoleMessage> retiredMessage;
/*
* Lock while updating buffer, and while taking snapshot of
* listeners array.
*/
{
MutexAutoLock lock(mLock);
#if defined(ANDROID)
if (sLoggingLogcat && aOutputMode == OutputToLog) {
nsCString msg;
aMessage->ToString(msg);
/** Attempt to use the process name as the log tag. */
mozilla::dom::ContentChild* child =
mozilla::dom::ContentChild::GetSingleton();
nsCString appName;
if (child) {
child->GetProcessName(appName);
} else {
appName = "GeckoConsole";
}
uint32_t logLevel = 0;
aMessage->GetLogLevel(&logLevel);
android_LogPriority logPriority = ANDROID_LOG_INFO;
switch (logLevel) {
case nsIConsoleMessage::debug:
logPriority = ANDROID_LOG_DEBUG;
break;
case nsIConsoleMessage::info:
logPriority = ANDROID_LOG_INFO;
break;
case nsIConsoleMessage::warn:
logPriority = ANDROID_LOG_WARN;
break;
case nsIConsoleMessage::error:
logPriority = ANDROID_LOG_ERROR;
break;
}
__android_log_print(logPriority, appName.get(), "%s", msg.get());
}
#endif
#ifdef XP_WIN
if (IsDebuggerPresent()) {
nsString msg;
aMessage->GetMessageMoz(getter_Copies(msg));
msg.Append('\n');
OutputDebugStringW(msg.get());
}
#endif
#ifdef MOZ_TASK_TRACER
{
nsCString msg;
aMessage->ToString(msg);
int prefixPos = msg.Find(GetJSLabelPrefix());
if (prefixPos >= 0) {
nsDependentCSubstring submsg(msg, prefixPos);
AddLabel("%s", submsg.BeginReading());
}
}
#endif
if (sLoggingBuffered) {
MessageElement* e = new MessageElement(aMessage);
mMessages.insertBack(e);
if (mCurrentSize != mMaximumSize) {
mCurrentSize++;
} else {
MessageElement* p = mMessages.popFirst();
MOZ_ASSERT(p);
p->swapMessage(retiredMessage);
delete p;
}
}
if (mListeners.Count() > 0) {
r = new LogMessageRunnable(aMessage, this);
}
}
if (retiredMessage) {
// Release |retiredMessage| on the main thread in case it is an instance of
// a mainthread-only class like nsScriptErrorWithStack and we're off the
// main thread.
NS_ReleaseOnMainThread(retiredMessage);
}
if (r) {
// avoid failing in XPCShell tests
nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
if (mainThread) {
NS_DispatchToMainThread(r.forget());
}
}
return NS_OK;
}
void
nsConsoleService::CollectCurrentListeners(
nsCOMArray<nsIConsoleListener>& aListeners)
{
MutexAutoLock lock(mLock);
for (auto iter = mListeners.Iter(); !iter.Done(); iter.Next()) {
nsIConsoleListener* value = iter.UserData();
aListeners.AppendObject(value);
}
}
NS_IMETHODIMP
nsConsoleService::LogStringMessage(const char16_t* aMessage)
{
if (!sLoggingEnabled) {
return NS_OK;
}
RefPtr<nsConsoleMessage> msg(new nsConsoleMessage(aMessage));
return this->LogMessage(msg);
}
NS_IMETHODIMP
nsConsoleService::GetMessageArray(uint32_t* aCount,
nsIConsoleMessage*** aMessages)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mLock);
if (mMessages.isEmpty()) {
/*
* Make a 1-length output array so that nobody gets confused,
* and return a count of 0. This should result in a 0-length
* array object when called from script.
*/
nsIConsoleMessage** messageArray = (nsIConsoleMessage**)
moz_xmalloc(sizeof(nsIConsoleMessage*));
*messageArray = nullptr;
*aMessages = messageArray;
*aCount = 0;
return NS_OK;
}
MOZ_ASSERT(mCurrentSize <= mMaximumSize);
nsIConsoleMessage** messageArray =
static_cast<nsIConsoleMessage**>(moz_xmalloc(sizeof(nsIConsoleMessage*)
* mCurrentSize));
uint32_t i = 0;
for (MessageElement* e = mMessages.getFirst(); e != nullptr; e = e->getNext()) {
nsCOMPtr<nsIConsoleMessage> m = e->Get();
m.forget(&messageArray[i]);
i++;
};
MOZ_ASSERT(i == mCurrentSize);
*aCount = i;
*aMessages = messageArray;
return NS_OK;
}
NS_IMETHODIMP
nsConsoleService::RegisterListener(nsIConsoleListener* aListener)
{
if (!NS_IsMainThread()) {
NS_ERROR("nsConsoleService::RegisterListener is main thread only.");
return NS_ERROR_NOT_SAME_THREAD;
}
nsCOMPtr<nsISupports> canonical = do_QueryInterface(aListener);
MutexAutoLock lock(mLock);
if (mListeners.GetWeak(canonical)) {
// Reregistering a listener isn't good
return NS_ERROR_FAILURE;
}
mListeners.Put(canonical, aListener);
return NS_OK;
}
NS_IMETHODIMP
nsConsoleService::UnregisterListener(nsIConsoleListener* aListener)
{
if (!NS_IsMainThread()) {
NS_ERROR("nsConsoleService::UnregisterListener is main thread only.");
return NS_ERROR_NOT_SAME_THREAD;
}
nsCOMPtr<nsISupports> canonical = do_QueryInterface(aListener);
MutexAutoLock lock(mLock);
if (!mListeners.GetWeak(canonical)) {
// Unregistering a listener that was never registered?
return NS_ERROR_FAILURE;
}
mListeners.Remove(canonical);
return NS_OK;
}
NS_IMETHODIMP
nsConsoleService::Reset()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
/*
* Make sure nobody trips into the buffer while it's being reset
*/
MutexAutoLock lock(mLock);
ClearMessages();
return NS_OK;
}
NS_IMETHODIMP
nsConsoleService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData)
{
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
// Dump all our messages, in case any are cycle collected.
Reset();
// We could remove ourselves from the observer service, but it is about to
// drop all observers anyways, so why bother.
} else if (!strcmp(aTopic, "inner-window-destroyed")) {
nsCOMPtr<nsISupportsPRUint64> supportsInt = do_QueryInterface(aSubject);
MOZ_ASSERT(supportsInt);
uint64_t windowId;
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(supportsInt->GetData(&windowId)));
ClearMessagesForWindowID(windowId);
} else {
MOZ_CRASH();
}
return NS_OK;
}