Method executeTask

launcher/meta/BaseEntity.cpp:111–182

BaseEntityLoadTask::BaseEntityLoadTask(BaseEntity* parent, Net::Mode mode) : m_entity(parent), m_mode(mode) {}

void BaseEntityLoadTask::executeTask()
{
    const QString fname = QDir("meta").absoluteFilePath(m_entity->localFilename());
    auto hashMatches = false;
    // the file exists on disk try to load it
    if (QFile::exists(fname)) {
        try {
            QByteArray fileData;
            // read local file if nothing is loaded yet
            if (m_entity->m_load_status == BaseEntity::LoadStatus::NotLoaded || m_entity->m_file_sha256.isEmpty()) {
                setStatus(tr("Loading local file"));
                fileData = FS::read(fname);
                m_entity->m_file_sha256 = Hashing::hash(fileData, Hashing::Algorithm::Sha256);
            }

            // on online the hash needs to match
            hashMatches = m_entity->m_sha256 == m_entity->m_file_sha256;
            if (m_mode == Net::Mode::Online && !m_entity->m_sha256.isEmpty() && !hashMatches) {
                throw Exception("mismatched checksum");
            }

            // load local file
            if (m_entity->m_load_status == BaseEntity::LoadStatus::NotLoaded) {
                auto doc = Json::requireDocument(fileData, fname);
                auto obj = Json::requireObject(doc, fname);
                m_entity->parse(obj);
                m_entity->m_load_status = BaseEntity::LoadStatus::Local;
            }

        } catch (const Exception& e) {
            qDebug() << QString("Unable to parse file %1: %2").arg(fname, e.cause());
            // just make sure it's gone and we never consider it again.
            FS::deletePath(fname);
            m_entity->m_load_status = BaseEntity::LoadStatus::NotLoaded;
        }
    }
    // if we need remote update, run the update task
    auto wasLoadedOffline = m_entity->m_load_status != BaseEntity::LoadStatus::NotLoaded && m_mode == Net::Mode::Offline;
    // if has is not present allways fetch from remote(e.g. the main index file), else only fetch if hash doesn't match
    auto wasLoadedRemote = m_entity->m_sha256.isEmpty() ? m_entity->m_load_status == BaseEntity::LoadStatus::Remote : hashMatches;
    if (wasLoadedOffline || wasLoadedRemote) {
        emitSucceeded();
        return;
    }
    m_task.reset(new NetJob(QObject::tr("Download of meta file %1").arg(m_entity->localFilename()), APPLICATION->network()));
    auto url = m_entity->url();
    auto entry = APPLICATION->metacache()->resolveEntry("meta", m_entity->localFilename());
    entry->setStale(true);
    auto dl = Net::ApiDownload::makeCached(url, entry);
    /*
     * The validator parses the file and loads it into the object.
     * If that fails, the file is not written to storage.
     */
    if (!m_entity->m_sha256.isEmpty())
        dl->addValidator(new Net::ChecksumValidator(QCryptographicHash::Algorithm::Sha256, m_entity->m_sha256));
    dl->addValidator(new ParsingValidator(m_entity));
    m_task->addNetAction(dl);
    m_task->setAskRetry(false);