From a460447ca9ed1000c1881b15ceeba15fe27df843 Mon Sep 17 00:00:00 2001
From: Bill Somerville <g4wjs@classdesign.com>
Date: Sat, 20 Feb 2016 12:55:18 +0000
Subject: [PATCH] Attempt to recover from network failures

QNetworkAccessManager which is  used for all network  traffic does not
automatically  recover  from  network  outages. This  patch  tries  to
reestablish network accessibility before any requests are attempted.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6471 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 DisplayManual.cpp               |  5 +++++
 SampleDownloader/RemoteFile.cpp |  5 +++++
 wsprnet.cpp                     | 19 ++++++++++++-------
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/DisplayManual.cpp b/DisplayManual.cpp
index caea2ebc6..155c22006 100644
--- a/DisplayManual.cpp
+++ b/DisplayManual.cpp
@@ -49,6 +49,11 @@ public:
 
   void display (QUrl const& url, QString const& name_we)
   {
+    if (QNetworkAccessManager::Accessible != qnam_->networkAccessible ()) {
+      // try and recover network access for QNAM
+      qnam_->setNetworkAccessible (QNetworkAccessManager::Accessible);
+    }
+
     // try and find a localized manual
     auto lang = QLocale::system ().name ();
     // try for language and country first
diff --git a/SampleDownloader/RemoteFile.cpp b/SampleDownloader/RemoteFile.cpp
index 57d33463c..295301317 100644
--- a/SampleDownloader/RemoteFile.cpp
+++ b/SampleDownloader/RemoteFile.cpp
@@ -109,6 +109,11 @@ bool RemoteFile::sync (QUrl const& url, bool local, bool force)
 
 void RemoteFile::download (QUrl const& url)
 {
+  if (QNetworkAccessManager::Accessible != network_manager_->networkAccessible ()) {
+    // try and recover network access for QNAM
+    network_manager_->setNetworkAccessible (QNetworkAccessManager::Accessible);
+  }
+
   QNetworkRequest request {url};
   request.setRawHeader ("User-Agent", "WSJT Sample Downloader");
   request.setOriginatingObject (this);
diff --git a/wsprnet.cpp b/wsprnet.cpp
index 9685b2760..06c7943d1 100644
--- a/wsprnet.cpp
+++ b/wsprnet.cpp
@@ -207,14 +207,18 @@ QString WSPRNet::urlEncodeSpot(QHash<QString,QString> const& query)
 
 void WSPRNet::work()
 {
-    if (!urlQueue.isEmpty()) {
-        QUrl url(urlQueue.dequeue());
-        QNetworkRequest request(url);
-        m_outstandingRequests << networkManager->get(request);
-        emit uploadStatus(QString {"Uploading Spot %1/%2"}.arg (m_urlQueueSize - urlQueue.size()).arg (m_urlQueueSize));
-    } else {
-        uploadTimer->stop();
+  if (!urlQueue.isEmpty()) {
+    if (QNetworkAccessManager::Accessible != networkManager->networkAccessible ()) {
+      // try and recover network access for QNAM
+      networkManager->setNetworkAccessible (QNetworkAccessManager::Accessible);
     }
+    QUrl url(urlQueue.dequeue());
+    QNetworkRequest request(url);
+    m_outstandingRequests << networkManager->get(request);
+    emit uploadStatus(QString {"Uploading Spot %1/%2"}.arg (m_urlQueueSize - urlQueue.size()).arg (m_urlQueueSize));
+  } else {
+    uploadTimer->stop();
+  }
 }
 
 void WSPRNet::abortOutstandingRequests () {
@@ -222,4 +226,5 @@ void WSPRNet::abortOutstandingRequests () {
   for (auto& request : m_outstandingRequests) {
     request->abort ();
   }
+  m_urlQueueSize = 0;
 }