From 9334947d365dd7759f36026e7fc233dace41895e Mon Sep 17 00:00:00 2001
From: Mate Barany <mate.barany@qt.io>
Date: Fri, 1 Sep 2023 17:15:44 +0200
Subject: [PATCH] Add dummy backend to QNetworkInformation
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The integration of QTBUG-113813 has failed because at the moment there
is no network information backend for QNX. Implement a simple dummy
backend to handle these cases.

Task-number: QTBUG-113813
Change-Id: Id6fa3e590c43b0125d82e8680733e30788d9894e
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
---
 src/network/kernel/qnetworkinformation.cpp | 34 +++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/network/kernel/qnetworkinformation.cpp b/src/network/kernel/qnetworkinformation.cpp
index aa07fa0a3ef..3de6e4908e8 100644
--- a/src/network/kernel/qnetworkinformation.cpp
+++ b/src/network/kernel/qnetworkinformation.cpp
@@ -50,6 +50,18 @@ static void networkInfoCleanup()
     dataHolder->instanceHolder.reset();
 }
 
+using namespace Qt::Literals::StringLiterals;
+
+class QNetworkInformationDummyBackend : public QNetworkInformationBackend {
+    Q_OBJECT
+public:
+    QString name() const override { return u"dummy"_s; }
+    QNetworkInformation::Features featuresSupported() const override
+    {
+        return {};
+    }
+};
+
 class QNetworkInformationPrivate : public QObjectPrivate
 {
     Q_DECLARE_PUBLIC(QNetworkInformation)
@@ -60,6 +72,7 @@ public:
 
     static QNetworkInformation *create(QNetworkInformation::Features features);
     static QNetworkInformation *create(QStringView name);
+    static QNetworkInformation *createDummy();
     static QNetworkInformation *instance()
     {
         if (!dataHolder())
@@ -266,6 +279,20 @@ QNetworkInformation *QNetworkInformationPrivate::create(QNetworkInformation::Fea
     return nullptr;
 }
 
+QNetworkInformation *QNetworkInformationPrivate::createDummy()
+{
+    if (!dataHolder())
+        return nullptr;
+
+    QMutexLocker locker(&dataHolder->instanceMutex);
+    if (dataHolder->instanceHolder)
+        return dataHolder->instanceHolder.get();
+
+    QNetworkInformationBackend *backend =  new QNetworkInformationDummyBackend;
+    dataHolder->instanceHolder.reset(new QNetworkInformation(backend));
+    return dataHolder->instanceHolder.get();
+}
+
 /*!
     \class QNetworkInformationBackend
     \internal (Semi-private)
@@ -644,7 +671,8 @@ bool QNetworkInformation::loadDefaultBackend()
     index = QNetworkInformationBackend::PluginNamesLinuxIndex;
 #endif
     if (index == -1)
-        return false;
+        return loadBackendByName(u"dummy");
+
     return loadBackendByName(QNetworkInformationBackend::PluginNames[index]);
 }
 
@@ -661,6 +689,9 @@ bool QNetworkInformation::loadDefaultBackend()
 */
 bool QNetworkInformation::loadBackendByName(QStringView backend)
 {
+    if (backend == u"dummy")
+        return QNetworkInformationPrivate::createDummy() != nullptr;
+
     auto loadedBackend = QNetworkInformationPrivate::create(backend);
     return loadedBackend && loadedBackend->backendName().compare(backend, Qt::CaseInsensitive) == 0;
 }
@@ -727,3 +758,4 @@ QT_END_NAMESPACE
 
 #include "moc_qnetworkinformation.cpp"
 #include "moc_qnetworkinformation_p.cpp"
+#include "qnetworkinformation.moc"