databasetracker.cpp

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unsigned long long DatabaseTracker::usageForDatabase(const String& name, SecurityOrigin* origin)
{
    ASSERT(currentThread() == m_thread);
    String path = fullPathForDatabase(origin, name, false);
    if (path.isEmpty())
        return 0;
        
    long long size;
    return getFileSize(path, size) ? size : 0;
}

void DatabaseTracker::addOpenDatabase(Database* database)
{
    if (!database)
        return;

    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);

    if (!m_openDatabaseMap)
        m_openDatabaseMap.set(new DatabaseOriginMap);

    RefPtr<SecurityOrigin> origin(database->securityOriginCopy());
    String name(database->stringIdentifier());

    DatabaseNameMap* nameMap = m_openDatabaseMap->get(origin);
    if (!nameMap) {
        nameMap = new DatabaseNameMap;
        m_openDatabaseMap->set(origin, nameMap);
    }

    DatabaseSet* databaseSet = nameMap->get(name);
    if (!databaseSet) {
        databaseSet = new DatabaseSet;
        nameMap->set(name, databaseSet);
    }

    databaseSet->add(database);

    LOG(StorageAPI, "Added open Database %s (%p)\n", database->stringIdentifier().ascii().data(), database);
}

void DatabaseTracker::removeOpenDatabase(Database* database)
{
    if (!database)
        return;

    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);

    if (!m_openDatabaseMap) {
        ASSERT_NOT_REACHED();
        return;
    }

    RefPtr<SecurityOrigin> origin(database->securityOriginCopy());
    String name(database->stringIdentifier());

    DatabaseNameMap* nameMap = m_openDatabaseMap->get(origin);
    if (!nameMap) {
        ASSERT_NOT_REACHED();
        return;
    }

    DatabaseSet* databaseSet = nameMap->get(name);
    if (!databaseSet) {
        ASSERT_NOT_REACHED();
        return;
    }

    databaseSet->remove(database);

    LOG(StorageAPI, "Removed open Database %s (%p)\n", database->stringIdentifier().ascii().data(), database);

    if (!databaseSet->isEmpty())
        return;

    nameMap->remove(name);
    delete databaseSet;

    if (!nameMap->isEmpty())
        return;

    m_openDatabaseMap->remove(origin);
    delete nameMap;
}

unsigned long long DatabaseTracker::usageForOrigin(SecurityOrigin* origin)
{
    ASSERT(currentThread() == m_thread);
    Locker<OriginQuotaManager> locker(originQuotaManager());

    // Use the OriginQuotaManager mechanism to calculate the usage
    if (originQuotaManager().tracksOrigin(origin))
        return originQuotaManager().diskUsage(origin);
    
    // If the OriginQuotaManager doesn't track this origin already, prime it to do so
    originQuotaManager().trackOrigin(origin);
    
    Vector<String> names;
    databaseNamesForOrigin(origin, names);

    for (unsigned i = 0; i < names.size(); ++i)
        originQuotaManager().addDatabase(origin, names[i], fullPathForDatabase(origin, names[i], false));
    
    if (!originQuotaManager().tracksOrigin(origin))
        return 0;
    return originQuotaManager().diskUsage(origin);
}

unsigned long long DatabaseTracker::quotaForOrigin(SecurityOrigin* origin)
{
    ASSERT(currentThread() == m_thread || m_quotaMap);
    populateOrigins();
    MutexLocker lockQuotaMap(m_quotaMapGuard);
    return m_quotaMap->get(origin);
}

void DatabaseTracker::setQuota(SecurityOrigin* origin, unsigned long long quota)
{
    ASSERT(currentThread() == m_thread);
    if (quotaForOrigin(origin) == quota)
        return;

    openTrackerDatabase(true);
    if (!m_database.isOpen())
        return;

    {
        MutexLocker lockQuotaMap(m_quotaMapGuard);

        if (!m_quotaMap->contains(origin)) {
            SQLiteStatement statement(m_database, "INSERT INTO Origins VALUES (?, ?)");
            if (statement.prepare() != SQLResultOk) {
                LOG_ERROR("Unable to establish origin %s in the tracker", origin->databaseIdentifier().ascii().data());
            } else {
                statement.bindText(1, origin->databaseIdentifier());
                statement.bindInt64(2, quota);

                if (statement.step() != SQLResultDone)
                    LOG_ERROR("Unable to establish origin %s in the tracker", origin->databaseIdentifier().ascii().data());
            }
        } else {
            SQLiteStatement statement(m_database, "UPDATE Origins SET quota=? WHERE origin=?");        
            bool error = statement.prepare() != SQLResultOk;
            if (!error) {
                statement.bindInt64(1, quota);
                statement.bindText(2, origin->databaseIdentifier());

                error = !statement.executeCommand();
            }

            if (error)
                LOG_ERROR("Failed to set quota %llu in tracker database for origin %s", quota, origin->databaseIdentifier().ascii().data());
        }

        // FIXME: Is it really OK to update the quota in memory if we failed to update it on disk?
        m_quotaMap->set(origin, quota);
    }

    if (m_client)
        m_client->dispatchDidModifyOrigin(origin);
}

bool DatabaseTracker::addDatabase(SecurityOrigin* origin, const String& name, const String& path)
{
    ASSERT(currentThread() == m_thread);
    openTrackerDatabase(true);
    if (!m_database.isOpen())
        return false;
        
    // New database should never be added until the origin has been established
    ASSERT(hasEntryForOrigin(origin));

    SQLiteStatement statement(m_database, "INSERT INTO Databases (origin, name, path) VALUES (?, ?, ?);");

    if (statement.prepare() != SQLResultOk)
        return false;

    statement.bindText(1, origin->databaseIdentifier());
    statement.bindText(2, name);
    statement.bindText(3, path);

    if (!statement.executeCommand()) {
        LOG_ERROR("Failed to add database %s to origin %s: %s\n", name.ascii().data(), origin->databaseIdentifier().ascii().data(), m_database.lastErrorMsg());
        return false;
    }
    
    if (m_client)
        m_client->dispatchDidModifyOrigin(origin);
    
    return true;
}

void DatabaseTracker::deleteAllDatabases()
{
    ASSERT(currentThread() == m_thread);

    Vector<RefPtr<SecurityOrigin> > originsCopy;
    origins(originsCopy);

    for (unsigned i = 0; i < originsCopy.size(); ++i)
        deleteOrigin(originsCopy[i].get());
}

void DatabaseTracker::deleteOrigin(SecurityOrigin* origin)
{
    ASSERT(currentThread() == m_thread);
    openTrackerDatabase(false);
    if (!m_database.isOpen())
        return;

    Vector<String> databaseNames;
    if (!databaseNamesForOrigin(origin, databaseNames)) {
        LOG_ERROR("Unable to retrieve list of database names for origin %s", origin->databaseIdentifier().ascii().data());
        return;
    }
    
    for (unsigned i = 0; i < databaseNames.size(); ++i) {
        if (!deleteDatabaseFile(origin, databaseNames[i])) {
            LOG_ERROR("Unable to delete file for database %s in origin %s", databaseNames[i].ascii().data(), origin->databaseIdentifier().ascii().data());
            return;
        }
    }
    
    SQLiteStatement statement(m_database, "DELETE FROM Databases WHERE origin=?");
    if (statement.prepare() != SQLResultOk) {
        LOG_ERROR("Unable to prepare deletion of databases from origin %s from tracker", origin->databaseIdentifier().ascii().data());
        return;
    }
        
    statement.bindText(1, origin->databaseIdentifier());
    
    if (!statement.executeCommand()) {
        LOG_ERROR("Unable to execute deletion of databases from origin %s from tracker", origin->databaseIdentifier().ascii().data());
        return;
    }
    
    SQLiteStatement originStatement(m_database, "DELETE FROM Origins WHERE origin=?");
    if (originStatement.prepare() != SQLResultOk) {
        LOG_ERROR("Unable to prepare deletion of origin %s from tracker", origin->databaseIdentifier().ascii().data());
        return;
    }

    originStatement.bindText(1, origin->databaseIdentifier());
    
    if (!originStatement.executeCommand()) {
        LOG_ERROR("Unable to execute deletion of databases from origin %s from tracker", origin->databaseIdentifier().ascii().data());
        return;
    }

    deleteEmptyDirectory(originPath(origin));

    RefPtr<SecurityOrigin> originPossiblyLastReference = origin;
    {
        MutexLocker lockQuotaMap(m_quotaMapGuard);
        m_quotaMap->remove(origin);

        Locker<OriginQuotaManager> quotaManagerLocker(originQuotaManager());
        originQuotaManager().removeOrigin(origin);

        // If we removed the last origin, do some additional deletion.
        if (m_quotaMap->isEmpty()) {
            if (m_database.isOpen())
                m_database.close();
            deleteFile(trackerDatabasePath());
            deleteEmptyDirectory(m_databaseDirectoryPath);
        }
    }

    if (m_client) {
        m_client->dispatchDidModifyOrigin(origin);
        for (unsigned i = 0; i < databaseNames.size(); ++i)
            m_client->dispatchDidModifyDatabase(origin, databaseNames[i]);
    }
}

void DatabaseTracker::deleteDatabase(SecurityOrigin* origin, const String& name)
{
    ASSERT(currentThread() == m_thread);
    openTrackerDatabase(false);
    if (!m_database.isOpen())
        return;

    if (!deleteDatabaseFile(origin, name)) {
        LOG_ERROR("Unable to delete file for database %s in origin %s", name.ascii().data(), origin->databaseIdentifier().ascii().data());
        return;
    }
    
    SQLiteStatement statement(m_database, "DELETE FROM Databases WHERE origin=? AND name=?");
    if (statement.prepare() != SQLResultOk) {
        LOG_ERROR("Unable to prepare deletion of database %s from origin %s from tracker", name.ascii().data(), origin->databaseIdentifier().ascii().data());
        return;
    }
        
    statement.bindText(1, origin->databaseIdentifier());
    statement.bindText(2, name);
    
    if (!statement.executeCommand()) {
        LOG_ERROR("Unable to execute deletion of database %s from origin %s from tracker", name.ascii().data(), origin->databaseIdentifier().ascii().data());
        return;
    }
    
    {
        Locker<OriginQuotaManager> quotaManagerLocker(originQuotaManager());
        originQuotaManager().removeDatabase(origin, name);
    }
    
    if (m_client) {
        m_client->dispatchDidModifyOrigin(origin);
        m_client->dispatchDidModifyDatabase(origin, name);
    }
}

bool DatabaseTracker::deleteDatabaseFile(SecurityOrigin* origin, const String& name)
{
    ASSERT(currentThread() == m_thread);
    String fullPath = fullPathForDatabase(origin, name, false);
    if (fullPath.isEmpty())
        return true;

    Vector<RefPtr<Database> > deletedDatabases;

    // Make sure not to hold the m_openDatabaseMapGuard mutex when calling
    // Database::markAsDeletedAndClose(), since that can cause a deadlock
    // during the synchronous DatabaseThread call it triggers.

    {
        MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);
        if (m_openDatabaseMap) {
            // There are some open databases, lets check if they are for this origin.
            DatabaseNameMap* nameMap = m_openDatabaseMap->get(origin);
            if (nameMap && nameMap->size()) {
                // There are some open databases for this origin, lets check
                // if they are this database by name.
                DatabaseSet* databaseSet = nameMap->get(name);
                if (databaseSet && databaseSet->size()) {
                    // We have some database open with this name. Mark them as deleted.
                    DatabaseSet::const_iterator end = databaseSet->end();
                    for (DatabaseSet::const_iterator it = databaseSet->begin(); it != end; ++it)
                        deletedDatabases.append(*it);
                }
            }
        }
    }

    for (unsigned i = 0; i < deletedDatabases.size(); ++i)
        deletedDatabases[i]->markAsDeletedAndClose();

    return deleteFile(fullPath);
}

void DatabaseTracker::setClient(DatabaseTrackerClient* client)
{
    ASSERT(currentThread() == m_thread);
    m_client = client;
}

static Mutex& notificationMutex()
{
    DEFINE_STATIC_LOCAL(Mutex, mutex, ());
    return mutex;
}

typedef Vector<pair<SecurityOrigin*, String> > NotificationQueue;

static NotificationQueue& notificationQueue()
{
    DEFINE_STATIC_LOCAL(NotificationQueue, queue, ());
    return queue;
}

void DatabaseTracker::scheduleNotifyDatabaseChanged(SecurityOrigin* origin, const String& name)
{
    MutexLocker locker(notificationMutex());

    notificationQueue().append(pair<SecurityOrigin*, String>(origin, name.copy()));
    scheduleForNotification();
}

static bool notificationScheduled = false;

void DatabaseTracker::scheduleForNotification()
{
    ASSERT(!notificationMutex().tryLock());

    if (!notificationScheduled) {
        callOnMainThread(DatabaseTracker::notifyDatabasesChanged, 0);
        notificationScheduled = true;
    }
}

void DatabaseTracker::notifyDatabasesChanged(void*)
{
    // Note that if DatabaseTracker ever becomes non-singleton, we'll have to amend this notification
    // mechanism to include which tracker the notification goes out on as well.
    DatabaseTracker& theTracker(tracker());

    NotificationQueue notifications;
    {
        MutexLocker locker(notificationMutex());

        notifications.swap(notificationQueue());

        notificationScheduled = false;
    }

    if (!theTracker.m_client)
        return;

    for (unsigned i = 0; i < notifications.size(); ++i)
        theTracker.m_client->dispatchDidModifyDatabase(notifications[i].first, notifications[i].second);
}


} // namespace WebCore