////  ScriptCache.cpp//  libraries/script-engine/src////  Created by Brad Hefta-Gaub on 2015-03-30//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <QCoreApplication>#include <QEventLoop>#include <QNetworkAccessManager>#include <QNetworkReply>#include <QObject> #include <NetworkAccessManager.h>#include <SharedUtil.h> #include "ScriptCache.h" ScriptCache::ScriptCache(QObject* parent) {    // nothing to do here...} // QHash<QUrl, QString> _scriptCache; void ScriptCache::getScript(const QUrl& url, ScriptUser* scriptUser) {    if (_scriptCache.contains(url)) {        scriptUser->scriptContentsAvailable(url, _scriptCache[url]);        return;    }    _scriptUsers.insert(url, scriptUser);    QNetworkAccessManager& networkAccessManager = NetworkAccessManager::getInstance();    QNetworkRequest networkRequest = QNetworkRequest(url);    networkRequest.setHeader(QNetworkRequest::UserAgentHeader, HIGH_FIDELITY_USER_AGENT);    QNetworkReply* reply = networkAccessManager.get(networkRequest);    connect(reply, &QNetworkReply::finished, this, &ScriptCache::scriptDownloaded);} void ScriptCache::scriptDownloaded() {    QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());    QUrl url = reply->url();    QList<ScriptUser*> scriptUsers = _scriptUsers.values(url);    _scriptUsers.remove(url);        if (reply->error() == QNetworkReply::NoError && reply->attribute(QNetworkRequest::HttpStatusCodeAttribute) == 200) {        _scriptCache[url] = reply->readAll();        qDebug() << "_scriptCache.size:" << _scriptCache.size();                foreach(ScriptUser* user, scriptUsers) {            user->scriptContentsAvailable(url, _scriptCache[url]);        }    } else {        qDebug() << "ERROR Loading file:" << reply->url().toString();        foreach(ScriptUser* user, scriptUsers) {            user->errorInLoadingScript(url);        }    }    reply->deleteLater();} QString ScriptCache::getScript(const QUrl& url) {    qDebug() << "Script requested: " << url.toString();    QString scriptContents;    if (_scriptCache.contains(url)) {        qDebug() << "Script found in cache: " << url.toString();        scriptContents = _scriptCache[url];    } else {        qDebug() << "Script not found in cache: " << url.toString();                if (_blockingScriptsPending.contains(url)) {            // if we're already downloading this script, wait for it to complete...            qDebug() << "Already downloading script: " << url.toString();            while (_blockingScriptsPending.contains(url)) {                QEventLoop loop;                qDebug() << "about to call loop.processEvents()....";                loop.processEvents(QEventLoop::AllEvents, 1);                qDebug() << "AFTER loop.processEvents()....";            }            qDebug() << "Done waiting on downloading script: " << url.toString();            scriptContents = _scriptCache[url];        } else {            _blockingScriptsPending.insert(url);            qDebug() << "_blockingScriptsPending: " << _blockingScriptsPending;                        QNetworkAccessManager& networkAccessManager = NetworkAccessManager::getInstance();            QNetworkRequest networkRequest = QNetworkRequest(url);            networkRequest.setHeader(QNetworkRequest::UserAgentHeader, HIGH_FIDELITY_USER_AGENT);            QNetworkReply* reply = networkAccessManager.get(networkRequest);              connect(reply, &QNetworkReply::finished, this, &ScriptCache::scriptDownloadedSyncronously);            qDebug() << "Downloading script at" << url.toString();            //QEventLoop loop;            //QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));            //qDebug() << "starting loop....";            //loop.exec();            //qDebug() << "after loop....";             /*            if (reply->error() == QNetworkReply::NoError && reply->attribute(QNetworkRequest::HttpStatusCodeAttribute) == 200) {                scriptContents = reply->readAll();                _scriptCache[url] = scriptContents;                qDebug() << "_scriptCache.size:" << _scriptCache.size();            } else {                qDebug() << "ERROR Loading file:" << url.toString();            }            delete reply;            _blockingScriptsPending.remove(url);            qDebug() << "_blockingScriptsPending: " << _blockingScriptsPending;            */            while (_blockingScriptsPending.contains(url)) {                QEventLoop loop;                qDebug() << "about to call loop.processEvents()....";                loop.processEvents(QEventLoop::AllEvents, 1);                qDebug() << "AFTER loop.processEvents()....";            }            qDebug() << "Done waiting on downloading script: " << url.toString();            scriptContents = _scriptCache[url];        }    }    return scriptContents;} void ScriptCache::scriptDownloadedSyncronously() {     qDebug() << "ScriptCache::scriptDownloadedSyncronously()....";        QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());    QUrl url = reply->url();        if (reply->error() == QNetworkReply::NoError && reply->attribute(QNetworkRequest::HttpStatusCodeAttribute) == 200) {        _scriptCache[url] = reply->readAll();        qDebug() << "_scriptCache.size:" << _scriptCache.size();    } else {        qDebug() << "ERROR Loading file:" << reply->url().toString();    }        reply->deleteLater();     _blockingScriptsPending.remove(url);    qDebug() << "_blockingScriptsPending: " << _blockingScriptsPending;}