mirror of
https://github.com/mozilla/gecko-dev.git
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253 lines
8.8 KiB
C++
253 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsAnonymousTemporaryFile.h"
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#include "nsDirectoryServiceUtils.h"
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#include "nsDirectoryServiceDefs.h"
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#include "nsXULAppAPI.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsAppDirectoryServiceDefs.h"
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#ifdef XP_WIN
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "mozilla/Services.h"
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#include "nsIIdleService.h"
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#include "nsISimpleEnumerator.h"
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#include "nsIFile.h"
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#include "nsAutoPtr.h"
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#include "nsITimer.h"
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#include "nsCRT.h"
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using namespace mozilla;
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#endif
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// We store the temp files in the system temp dir.
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//
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// On Windows systems in particular we use a sub-directory of the temp
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// directory, because:
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// 1. DELETE_ON_CLOSE is unreliable on Windows, in particular if we power
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// cycle (and perhaps if we crash) the files are not deleted. We store
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// the temporary files in a known sub-dir so that we can find and delete
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// them easily and quickly.
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// 2. On Windows NT the system temp dir is in the user's $HomeDir/AppData,
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// so we can be sure the user always has write privileges to that directory;
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// if the sub-dir for our temp files was in some shared location and
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// was created by a privileged user, it's possible that other users
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// wouldn't have write access to that sub-dir. (Non-Windows systems
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// don't store their temp files in a sub-dir, so this isn't an issue on
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// those platforms).
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// 3. Content processes can access the system temp dir
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// (NS_GetSpecialDirectory fails on NS_APP_USER_PROFILE_LOCAL_50_DIR
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// for content process for example, which is where we previously stored
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// temp files on Windows). This argument applies to all platforms, not
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// just Windows.
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static nsresult
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GetTempDir(nsIFile** aTempDir)
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{
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if (NS_WARN_IF(!aTempDir))
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return NS_ERROR_INVALID_ARG;
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nsCOMPtr<nsIFile> tmpFile;
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nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(tmpFile));
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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#ifdef XP_WIN
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// On windows DELETE_ON_CLOSE is unreliable, so we store temporary files
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// in a subdir of the temp dir and delete that in an idle service observer
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// to ensure it's been cleared.
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rv = tmpFile->AppendNative(nsDependentCString("mozilla-temp-files"));
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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rv = tmpFile->Create(nsIFile::DIRECTORY_TYPE, 0700);
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if (rv != NS_ERROR_FILE_ALREADY_EXISTS && NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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#endif
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tmpFile.forget(aTempDir);
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return NS_OK;
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}
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nsresult
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NS_OpenAnonymousTemporaryFile(PRFileDesc** aOutFileDesc)
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{
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if (NS_WARN_IF(!aOutFileDesc))
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return NS_ERROR_INVALID_ARG;
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nsresult rv;
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nsCOMPtr<nsIFile> tmpFile;
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rv = GetTempDir(getter_AddRefs(tmpFile));
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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// Give the temp file a name with a random element. CreateUnique will also
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// append a counter to the name if it encounters a name collision. Adding
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// a random element to the name reduces the likelihood of a name collision,
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// so that CreateUnique() doesn't end up trying a lot of name variants in
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// its "try appending an incrementing counter" loop, as file IO can be
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// expensive on some mobile flash drives.
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nsAutoCString name("mozilla-temp-");
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name.AppendInt(rand());
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rv = tmpFile->AppendNative(name);
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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rv = tmpFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0700);
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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rv = tmpFile->OpenNSPRFileDesc(PR_RDWR | nsIFile::DELETE_ON_CLOSE,
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PR_IRWXU, aOutFileDesc);
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return rv;
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}
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#ifdef XP_WIN
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// On Windows we have an idle service observer that runs some time after
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// startup and deletes any stray anonymous temporary files...
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// Duration of idle time before we'll get a callback whereupon we attempt to
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// remove any stray and unused anonymous temp files.
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#define TEMP_FILE_IDLE_TIME_S 30
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// The nsAnonTempFileRemover is created in a timer, which sets an idle observer.
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// This is expiration time (in ms) which initial timer is set for (3 minutes).
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#define SCHEDULE_TIMEOUT_MS 3 * 60 * 1000
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#define XPCOM_SHUTDOWN_TOPIC "xpcom-shutdown"
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// This class adds itself as an idle observer. When the application has
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// been idle for about 30 seconds we'll get a notification, whereupon we'll
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// attempt to delete ${TempDir}/mozilla-temp-files/. This is to ensure all
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// temp files that were supposed to be deleted on application exit were actually
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// deleted, as they may not be if we previously crashed. See bugs 572579 and
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// 785662. This is only needed on some versions of Windows,
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// nsIFile::DELETE_ON_CLOSE works on other platforms.
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// This class adds itself as a shutdown observer so that it can cancel the
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// idle observer and its timer on shutdown. Note: the observer and idle
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// services hold references to instances of this object, and those references
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// are what keep this object alive.
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class nsAnonTempFileRemover MOZ_FINAL : public nsIObserver {
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public:
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NS_DECL_ISUPPORTS
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nsAnonTempFileRemover() {
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MOZ_COUNT_CTOR(nsAnonTempFileRemover);
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}
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~nsAnonTempFileRemover() {
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MOZ_COUNT_DTOR(nsAnonTempFileRemover);
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}
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nsresult Init() {
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// We add the idle observer in a timer, so that the app has enough
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// time to start up before we add the idle observer. If we register the
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// idle observer too early, it will be registered before the fake idle
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// service is installed when running in xpcshell, and this interferes with
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// the fake idle service, causing xpcshell-test failures.
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mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
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if (NS_WARN_IF(!mTimer))
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return NS_ERROR_FAILURE;
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nsresult rv = mTimer->Init(this,
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SCHEDULE_TIMEOUT_MS,
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nsITimer::TYPE_ONE_SHOT);
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if (NS_WARN_IF(NS_FAILED(rv)))
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return rv;
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// Register shutdown observer so we can cancel the timer if we shutdown before
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// the timer runs.
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nsCOMPtr<nsIObserverService> obsSrv = services::GetObserverService();
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if (NS_WARN_IF(!obsSrv))
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return NS_ERROR_FAILURE;
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return obsSrv->AddObserver(this, XPCOM_SHUTDOWN_TOPIC, false);
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}
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void Cleanup() {
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// Cancel timer.
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if (mTimer) {
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mTimer->Cancel();
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mTimer = nullptr;
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}
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// Remove idle service observer.
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nsCOMPtr<nsIIdleService> idleSvc =
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do_GetService("@mozilla.org/widget/idleservice;1");
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if (idleSvc) {
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idleSvc->RemoveIdleObserver(this, TEMP_FILE_IDLE_TIME_S);
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}
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// Remove shutdown observer.
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nsCOMPtr<nsIObserverService> obsSrv = services::GetObserverService();
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if (obsSrv) {
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obsSrv->RemoveObserver(this, XPCOM_SHUTDOWN_TOPIC);
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}
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}
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NS_IMETHODIMP Observe(nsISupports *aSubject,
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const char *aTopic,
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const PRUnichar *aData)
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{
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if (nsCRT::strcmp(aTopic, NS_TIMER_CALLBACK_TOPIC) == 0 &&
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NS_FAILED(RegisterIdleObserver())) {
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Cleanup();
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} else if (nsCRT::strcmp(aTopic, OBSERVER_TOPIC_IDLE) == 0) {
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// The user has been idle for a while, clean up the temp files.
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// The idle service will drop its reference to this object after
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// we exit, destroying this object.
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RemoveAnonTempFileFiles();
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Cleanup();
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} else if (nsCRT::strcmp(aTopic, XPCOM_SHUTDOWN_TOPIC) == 0) {
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Cleanup();
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}
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return NS_OK;
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}
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nsresult RegisterIdleObserver() {
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// Add this as an idle observer. When we've been idle for
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// TEMP_FILE_IDLE_TIME_S seconds, we'll get a notification, and we'll then
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// try to delete any stray temp files.
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nsCOMPtr<nsIIdleService> idleSvc =
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do_GetService("@mozilla.org/widget/idleservice;1");
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if (!idleSvc)
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return NS_ERROR_FAILURE;
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return idleSvc->AddIdleObserver(this, TEMP_FILE_IDLE_TIME_S);
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}
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void RemoveAnonTempFileFiles() {
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nsCOMPtr<nsIFile> tmpDir;
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nsresult rv = GetTempDir(getter_AddRefs(tmpDir));
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if (NS_WARN_IF(NS_FAILED(rv)))
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return;
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// Remove the directory recursively.
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tmpDir->Remove(true);
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}
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private:
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nsCOMPtr<nsITimer> mTimer;
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};
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NS_IMPL_ISUPPORTS1(nsAnonTempFileRemover, nsIObserver)
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nsresult CreateAnonTempFileRemover() {
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// Create a temp file remover. If Init() succeeds, the temp file remover is kept
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// alive by a reference held by the observer service, since the temp file remover
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// is a shutdown observer. We only create the temp file remover if we're running
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// in the main process; there's no point in doing the temp file removal multiple
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// times per startup.
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if (XRE_GetProcessType() != GeckoProcessType_Default) {
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return NS_OK;
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}
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nsRefPtr<nsAnonTempFileRemover> tempRemover = new nsAnonTempFileRemover();
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return tempRemover->Init();
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}
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#endif
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