[libcalamares] Add synchronousGet() to network service

- Synchronous download of a given URL; not something to
   do from the GUI thread.
 - Use it from the GeoIP service, which downloads in a
   separate thread to do GeoIP lookups.
 - Drop now-unused headers.
 - Adjust tests for GeoIP to use network service

src/libcalamares/geoip/GeoIPTests.cpp

@@ -24,9 +24,7 @@
 #endif
 #include "Handler.h"
 
-#include <QNetworkAccessManager>
-#include <QNetworkReply>
-#include <QNetworkRequest>
+#include "network/Manager.h"
 
 #include <QtTest/QtTest>
 
@@ -197,27 +195,9 @@ GeoIPTests::testSplitTZ()
 }
 
 
-static QByteArray
-synchronous_get( const char* urlstring )
-{
-    QUrl url( urlstring );
-    QNetworkAccessManager manager;
-    QEventLoop loop;
-
-    qDebug() << "Fetching" << url;
-
-    QObject::connect( &manager, &QNetworkAccessManager::finished, &loop, &QEventLoop::quit );
-
-    QNetworkRequest request( url );
-    QNetworkReply* reply = manager.get( request );
-    loop.exec();
-    reply->deleteLater();
-    return reply->readAll();
-}
-
 #define CHECK_GET( t, selector, url ) \
     { \
-        auto tz = GeoIP##t( selector ).processReply( synchronous_get( url ) ); \
+        auto tz = GeoIP##t( selector ).processReply( CalamaresUtils::Network::Manager::instance().synchronousGet( QUrl( url ) ) ); \
         qDebug() << tz; \
         QCOMPARE( default_tz, tz ); \
         auto tz2 = CalamaresUtils::GeoIP::Handler( "" #t, url, selector ).get(); \
@@ -236,7 +216,7 @@ GeoIPTests::testGet()
 
     GeoIPJSON default_handler;
     // Call the KDE service the definitive source.
-    auto default_tz = default_handler.processReply( synchronous_get( "https://geoip.kde.org/v1/calamares" ) );
+    auto default_tz = default_handler.processReply( CalamaresUtils::Network::Manager::instance().synchronousGet( QUrl( "https://geoip.kde.org/v1/calamares" ) ) );
 
     // This is bogus, because the test isn't always run by me
     // QCOMPARE( default_tz.first, QStringLiteral("Europe") );

src/libcalamares/geoip/Handler.cpp

@@ -23,14 +23,11 @@
 #include "GeoIPXML.h"
 #endif
 
+#include "network/Manager.h"
 #include "utils/Logger.h"
 #include "utils/NamedEnum.h"
 #include "utils/Variant.h"
 
-#include <QEventLoop>
-#include <QNetworkReply>
-#include <QNetworkRequest>
-
 #include <memory>
 
 static const NamedEnumTable< CalamaresUtils::GeoIP::Handler::Type >&
@@ -87,22 +84,6 @@ Handler::Handler( const QString& implementation, const QString& url, const QStri
 
 Handler::~Handler() {}
 
-static QByteArray
-synchronous_get( const QString& urlstring )
-{
-    QUrl url( urlstring );
-    QNetworkAccessManager manager;
-    QEventLoop loop;
-
-    QObject::connect( &manager, &QNetworkAccessManager::finished, &loop, &QEventLoop::quit );
-
-    QNetworkRequest request( url );
-    QNetworkReply* reply = manager.get( request );
-    loop.exec();
-    reply->deleteLater();
-    return reply->readAll();
-}
-
 static std::unique_ptr< Interface >
 create_interface( Handler::Type t, const QString& selector )
 {
@@ -131,7 +112,7 @@ do_query( Handler::Type type, const QString& url, const QString& selector )
         return RegionZonePair();
     }
 
-    return interface->processReply( synchronous_get( url ) );
+    return interface->processReply( CalamaresUtils::Network::Manager::instance().synchronousGet( url ) );
 }
 
 static QString
@@ -143,7 +124,7 @@ do_raw_query( Handler::Type type, const QString& url, const QString& selector )
         return QString();
     }
 
-    return interface->rawReply( synchronous_get( url ) );
+    return interface->rawReply( CalamaresUtils::Network::Manager::instance().synchronousGet( url ) );
 }
 
 RegionZonePair

src/libcalamares/network/Manager.cpp

@@ -95,5 +95,23 @@ CalamaresUtils::Network::Manager::synchronousPing( const QUrl& url )
     QEventLoop loop;
     connect( reply, &QNetworkReply::finished, &loop, &QEventLoop::quit );
     loop.exec();
+    reply->deleteLater();
     return reply->bytesAvailable();
 }
+
+QByteArray
+CalamaresUtils::Network::Manager::synchronousGet( const QUrl& url )
+{
+    if ( !url.isValid() )
+    {
+        return QByteArray();
+    }
+
+    QNetworkRequest request( url );
+    QNetworkReply* reply = d->m_nam->get( request );
+    QEventLoop loop;
+    connect( reply, &QNetworkReply::finished, &loop, &QEventLoop::quit );
+    loop.exec();
+    reply->deleteLater();
+    return reply->readAll();
+}

src/libcalamares/network/Manager.h

@@ -21,6 +21,7 @@
 
 #include "DllMacro.h"
 
+#include <QByteArray>
 #include <QObject>
 #include <QUrl>
 
@@ -52,6 +53,13 @@ public:
      */
     bool synchronousPing( const QUrl& url );
 
+    /** @brief Downloads the data from a given @p url
+     *
+     * Returns the data as a QByteArray, or an empty
+     * array if any error occurred.
+     */
+    QByteArray synchronousGet( const QUrl& url );
+
     /// @brief Set the URL which is used for the general "is there internet" check.
     void setCheckHasInternetUrl( const QUrl& url );
     /** @brief Do an explicit check for internet connectivity.