mirror of
https://github.com/mozilla/gecko-dev.git
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129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 "nsUpdateSyncManager.h"
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#include "mozilla/Unused.h"
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#include "mozilla/Services.h"
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#include "nsComponentManagerUtils.h"
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#include "nsCRT.h"
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#include "nsIFile.h"
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#include "nsIObserverService.h"
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#include "nsIProperties.h"
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#include "nsString.h"
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#include "nsXULAppAPI.h"
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// The lock code generates a path that already includes the vendor name,
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// so this only needs to name the specific lock.
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#define UPDATE_LOCK_NAME_TOKEN "UpdateLock"
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nsUpdateSyncManager* gUpdateSyncManager = nullptr;
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NS_IMPL_ISUPPORTS(nsUpdateSyncManager, nsIUpdateSyncManager, nsIObserver)
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nsUpdateSyncManager::nsUpdateSyncManager(nsIFile* anAppFile /* = nullptr */) {
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gUpdateSyncManager = this;
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OpenLock(anAppFile);
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}
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nsUpdateSyncManager::~nsUpdateSyncManager() {
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ReleaseLock();
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gUpdateSyncManager = nullptr;
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}
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already_AddRefed<nsUpdateSyncManager> nsUpdateSyncManager::GetSingleton() {
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if (!gUpdateSyncManager) {
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new nsUpdateSyncManager(); // This sets gUpdateSyncManager.
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}
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return do_AddRef(gUpdateSyncManager);
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}
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NS_IMETHODIMP nsUpdateSyncManager::Observe(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aData) {
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mozilla::Unused << aSubject;
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mozilla::Unused << aData;
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// We want to hold the lock for as much of the lifetime of the app as we can,
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// so we observe xpcom-startup so we get constructed as early as possible,
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// which triggers constructing the singleton.
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if (!nsCRT::strcmp(aTopic, NS_XPCOM_STARTUP_OBSERVER_ID)) {
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (observerService) {
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return observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
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false);
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}
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return NS_ERROR_SERVICE_NOT_AVAILABLE;
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}
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if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
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ReleaseLock();
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}
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return NS_OK;
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}
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nsresult nsUpdateSyncManager::OpenLock(nsIFile* anAppFile) {
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nsresult rv;
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if (mLock != MULTI_INSTANCE_LOCK_HANDLE_ERROR) {
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// Lock is already open.
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return NS_OK;
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}
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// Our component registration should already have made sure of this.
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if (NS_WARN_IF(XRE_GetProcessType() != GeckoProcessType_Default)) {
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return NS_OK;
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}
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nsCOMPtr<nsIFile> appFile = mozilla::GetNormalizedAppFile(anAppFile);
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if (!appFile) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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nsCOMPtr<nsIFile> appDirFile;
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rv = appFile->GetParent(getter_AddRefs(appDirFile));
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NS_ENSURE_SUCCESS(rv, rv);
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nsAutoString appDirPath;
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rv = appDirFile->GetPath(appDirPath);
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NS_ENSURE_SUCCESS(rv, rv);
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mLock =
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mozilla::OpenMultiInstanceLock(UPDATE_LOCK_NAME_TOKEN, appDirPath.get());
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NS_ENSURE_TRUE(mLock, NS_ERROR_FAILURE);
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return NS_OK;
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}
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void nsUpdateSyncManager::ReleaseLock() {
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if (mLock == MULTI_INSTANCE_LOCK_HANDLE_ERROR) {
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// Lock is already released.
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return;
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}
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mozilla::ReleaseMultiInstanceLock(mLock);
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mLock = MULTI_INSTANCE_LOCK_HANDLE_ERROR;
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}
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NS_IMETHODIMP nsUpdateSyncManager::IsOtherInstanceRunning(bool* aResult) {
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if (NS_WARN_IF(XRE_GetProcessType() != GeckoProcessType_Default)) {
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return NS_ERROR_SERVICE_NOT_AVAILABLE;
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}
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if (mLock == MULTI_INSTANCE_LOCK_HANDLE_ERROR) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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bool rv = mozilla::IsOtherInstanceRunning(mLock, aResult);
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NS_ENSURE_TRUE(rv, NS_ERROR_FAILURE);
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return NS_OK;
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}
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NS_IMETHODIMP nsUpdateSyncManager::ResetLock(nsIFile* anAppFile = nullptr) {
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ReleaseLock();
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return OpenLock(anAppFile);
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}
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