Introduce QNetworkConnection/Status/Monitor

Private classes to replace broken or even not working at all 'session management'
and 'bearer manager' (on at least two major platforms we support). This
implementation is macOS/iOS-specific and uses SystemConfiguration framework,
or more precisely SCNetworkReachability's part of it.

Task-number: QTBUG-40332
Change-Id: Iac5f44c4063c4092b93b8cf2bde3fb2c524855b3
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 37 insertions, 1 deletions

diff --git a/src/network/access/qhttpnetworkconnection.cpp b/src/network/access/qhttpnetworkconnection.cpp
index 0a37122fc6..cb4c722eb5 100644
--- a/src/network/access/qhttpnetworkconnection.cpp
+++ b/src/network/access/qhttpnetworkconnection.cpp
@@ -1320,6 +1320,10 @@ QHttpNetworkConnection::QHttpNetworkConnection(const QString &hostName, quint16
     Q_D(QHttpNetworkConnection);
     d->networkSession = std::move(networkSession);
     d->init();
+    if (QNetworkStatusMonitor::isEnabled()) {
+        connect(&d->connectionMonitor, &QNetworkConnectionMonitor::reachabilityChanged,
+                this, &QHttpNetworkConnection::onlineStateChanged, Qt::QueuedConnection);
+    }
 }
 
 QHttpNetworkConnection::QHttpNetworkConnection(quint16 connectionCount, const QString &hostName,
@@ -1332,6 +1336,10 @@ QHttpNetworkConnection::QHttpNetworkConnection(quint16 connectionCount, const QS
     Q_D(QHttpNetworkConnection);
     d->networkSession = std::move(networkSession);
     d->init();
+    if (QNetworkStatusMonitor::isEnabled()) {
+        connect(&d->connectionMonitor, &QNetworkConnectionMonitor::reachabilityChanged,
+                this, &QHttpNetworkConnection::onlineStateChanged, Qt::QueuedConnection);
+    }
 }
 #else
 QHttpNetworkConnection::QHttpNetworkConnection(const QString &hostName, quint16 port, bool encrypt,
@@ -1340,6 +1348,10 @@ QHttpNetworkConnection::QHttpNetworkConnection(const QString &hostName, quint16
 {
     Q_D(QHttpNetworkConnection);
     d->init();
+    if (QNetworkStatusMonitor::isEnabled()) {
+        connect(&d->connectionMonitor, &QNetworkConnectionMonitor::reachabilityChanged,
+                this, &QHttpNetworkConnection::onlineStateChanged, Qt::QueuedConnection);
+    }
 }
 
 QHttpNetworkConnection::QHttpNetworkConnection(quint16 connectionCount, const QString &hostName,
@@ -1350,8 +1362,12 @@ QHttpNetworkConnection::QHttpNetworkConnection(quint16 connectionCount, const QS
 {
     Q_D(QHttpNetworkConnection);
     d->init();
+    if (QNetworkStatusMonitor::isEnabled()) {
+        connect(&d->connectionMonitor, &QNetworkConnectionMonitor::reachabilityChanged,
+                this, &QHttpNetworkConnection::onlineStateChanged, Qt::QueuedConnection);
+    }
 }
-#endif
+#endif // QT_NO_BEARERMANAGEMENT
 
 QHttpNetworkConnection::~QHttpNetworkConnection()
 {
@@ -1531,6 +1547,26 @@ void QHttpNetworkConnection::setPeerVerifyName(const QString &peerName)
     d->peerVerifyName = peerName;
 }
 
+void QHttpNetworkConnection::onlineStateChanged(bool isOnline)
+{
+    Q_D(QHttpNetworkConnection);
+
+    if (isOnline) {
+        // If we did not have any 'isOffline' previously - well, good
+        // to know, we are 'online' apparently.
+        return;
+    }
+
+    for (int i = 0; i < d->activeChannelCount; i++) {
+        auto &channel = d->channels[i];
+        channel.emitFinishedWithError(QNetworkReply::TemporaryNetworkFailureError, "Temporary network failure.");
+        channel.close();
+    }
+
+    // We don't care, this connection is broken from our POV.
+    d->connectionMonitor.stopMonitoring();
+}
+
 #ifndef QT_NO_NETWORKPROXY
 // only called from QHttpNetworkConnectionChannel::_q_proxyAuthenticationRequired, not
 // from QHttpNetworkConnectionChannel::handleAuthenticationChallenge