Merge #8996: Network activity toggle

19f46f1 Qt: New network_disabled icon (Luke Dashjr)
54cf997 RPC/Net: Use boolean consistently for networkactive, and remove from getinfo (Luke Dashjr)
b2b33d9 Overhaul network activity toggle (Jonas Schnelli)
32efa79 Qt: Add GUI feedback and control of network activity state. (Jon Lund Steffensen)
e38993b RPC: Add "togglenetwork" method to toggle network activity temporarily (Jon Lund Steffensen)
7c9a98a Allow network activity to be temporarily suspended. (Jon Lund Steffensen)

contrib/debian/copyright

@@ -47,7 +47,10 @@ Comment: Site: https://github.com/stephenhutchings/typicons.font
 
 Files: src/qt/res/icons/connect*.png
        src/qt/res/src/connect-*.svg
+       src/qt/res/icons/network_disabled.png
+       src/qt/res/src/network_disabled.svg
 Copyright: Marco Falke
+           Luke Dashjr
 License: Expat
 Comment: Inspired by Stephan Hutchings Typicons
 

src/Makefile.qt.include

@@ -271,6 +271,7 @@ RES_ICONS = \
   qt/res/icons/key.png \
   qt/res/icons/lock_closed.png \
   qt/res/icons/lock_open.png \
+  qt/res/icons/network_disabled.png \
   qt/res/icons/open.png \
   qt/res/icons/overview.png \
   qt/res/icons/quit.png \

src/net.cpp

@@ -985,6 +985,12 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
         return;
     }
 
+    if (!fNetworkActive) {
+        LogPrintf("connection from %s dropped: not accepting new connections\n", addr.ToString());
+        CloseSocket(hSocket);
+        return;
+    }
+
     if (!IsSelectableSocket(hSocket))
     {
         LogPrintf("connection from %s dropped: non-selectable socket\n", addr.ToString());
@@ -1784,6 +1790,9 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
     // Initiate outbound network connection
     //
     boost::this_thread::interruption_point();
+    if (!fNetworkActive) {
+        return false;
+    }
     if (!pszDest) {
         if (IsLocal(addrConnect) ||
             FindNode((CNetAddr)addrConnect) || IsBanned(addrConnect) ||
@@ -2025,8 +2034,30 @@ void Discover(boost::thread_group& threadGroup)
 #endif
 }
 
+void CConnman::SetNetworkActive(bool active)
+{
+    if (fDebug) {
+        LogPrint("net", "SetNetworkActive: %s\n", active);
+    }
+
+    if (!active) {
+        fNetworkActive = false;
+
+        LOCK(cs_vNodes);
+        // Close sockets to all nodes
+        BOOST_FOREACH(CNode* pnode, vNodes) {
+            pnode->CloseSocketDisconnect();
+        }
+    } else {
+        fNetworkActive = true;
+    }
+
+    uiInterface.NotifyNetworkActiveChanged(fNetworkActive);
+}
+
 CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In) : nSeed0(nSeed0In), nSeed1(nSeed1In)
 {
+    fNetworkActive = true;
     setBannedIsDirty = false;
     fAddressesInitialized = false;
     nLastNodeId = 0;

src/net.h

@@ -131,6 +131,8 @@ public:
     bool Start(boost::thread_group& threadGroup, CScheduler& scheduler, std::string& strNodeError, Options options);
     void Stop();
     bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
+    bool GetNetworkActive() const { return fNetworkActive; };
+    void SetNetworkActive(bool active);
     bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false, bool fFeeler = false);
     bool CheckIncomingNonce(uint64_t nonce);
 
@@ -401,6 +403,7 @@ private:
     unsigned int nReceiveFloodSize;
 
     std::vector<ListenSocket> vhListenSocket;
+    bool fNetworkActive;
     banmap_t setBanned;
     CCriticalSection cs_setBanned;
     bool setBannedIsDirty;

src/qt/bitcoin.qrc

@@ -52,6 +52,7 @@
         <file alias="transaction_abandoned">res/icons/transaction_abandoned.png</file>
         <file alias="hd_enabled">res/icons/hd_enabled.png</file>
         <file alias="hd_disabled">res/icons/hd_disabled.png</file>
+        <file alias="network_disabled">res/icons/network_disabled.png</file>
     </qresource>
     <qresource prefix="/movies">
         <file alias="spinner-000">res/movies/spinner-000.png</file>

src/qt/bitcoingui.cpp

@@ -86,7 +86,7 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
     unitDisplayControl(0),
     labelWalletEncryptionIcon(0),
     labelWalletHDStatusIcon(0),
-    labelConnectionsIcon(0),
+    connectionsControl(0),
     labelBlocksIcon(0),
     progressBarLabel(0),
     progressBar(0),
@@ -199,7 +199,7 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
     unitDisplayControl = new UnitDisplayStatusBarControl(platformStyle);
     labelWalletEncryptionIcon = new QLabel();
     labelWalletHDStatusIcon = new QLabel();
-    labelConnectionsIcon = new QLabel();
+    connectionsControl = new NetworkToggleStatusBarControl();
     labelBlocksIcon = new QLabel();
     if(enableWallet)
     {
@@ -210,7 +210,7 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
         frameBlocksLayout->addWidget(labelWalletHDStatusIcon);
     }
     frameBlocksLayout->addStretch();
-    frameBlocksLayout->addWidget(labelConnectionsIcon);
+    frameBlocksLayout->addWidget(connectionsControl);
     frameBlocksLayout->addStretch();
     frameBlocksLayout->addWidget(labelBlocksIcon);
     frameBlocksLayout->addStretch();
@@ -469,8 +469,9 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel)
         createTrayIconMenu();
 
         // Keep up to date with client
-        setNumConnections(_clientModel->getNumConnections());
+        updateNetworkState();
         connect(_clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
+        connect(_clientModel, SIGNAL(networkActiveChanged(bool)), this, SLOT(setNetworkActive(bool)));
 
         setNumBlocks(_clientModel->getNumBlocks(), _clientModel->getLastBlockDate(), _clientModel->getVerificationProgress(NULL), false);
         connect(_clientModel, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
@@ -489,6 +490,7 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel)
         }
 #endif // ENABLE_WALLET
         unitDisplayControl->setOptionsModel(_clientModel->getOptionsModel());
+        connectionsControl->setClientModel(_clientModel);
         
         OptionsModel* optionsModel = _clientModel->getOptionsModel();
         if(optionsModel)
@@ -698,8 +700,9 @@ void BitcoinGUI::gotoVerifyMessageTab(QString addr)
 }
 #endif // ENABLE_WALLET
 
-void BitcoinGUI::setNumConnections(int count)
+void BitcoinGUI::updateNetworkState()
 {
+    int count = clientModel->getNumConnections();
     QString icon;
     switch(count)
     {
@@ -709,8 +712,25 @@ void BitcoinGUI::setNumConnections(int count)
     case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
     default: icon = ":/icons/connect_4"; break;
     }
-    labelConnectionsIcon->setPixmap(platformStyle->SingleColorIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
-    labelConnectionsIcon->setToolTip(tr("%n active connection(s) to Bitcoin network", "", count));
+
+    if (clientModel->getNetworkActive()) {
+        connectionsControl->setToolTip(tr("%n active connection(s) to Bitcoin network", "", count));
+    } else {
+        connectionsControl->setToolTip(tr("Network activity disabled"));
+        icon = ":/icons/network_disabled";
+    }
+
+    connectionsControl->setPixmap(platformStyle->SingleColorIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
+}
+
+void BitcoinGUI::setNumConnections(int count)
+{
+    updateNetworkState();
+}
+
+void BitcoinGUI::setNetworkActive(bool networkActive)
+{
+    updateNetworkState();
 }
 
 void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
@@ -1211,3 +1231,18 @@ void UnitDisplayStatusBarControl::onMenuSelection(QAction* action)
         optionsModel->setDisplayUnit(action->data());
     }
 }
+
+void NetworkToggleStatusBarControl::mousePressEvent(QMouseEvent *event)
+{
+    if (clientModel) {
+        clientModel->setNetworkActive(!clientModel->getNetworkActive());
+    }
+}
+
+/** Lets the control know about the Client Model */
+void NetworkToggleStatusBarControl::setClientModel(ClientModel *_clientModel)
+{
+    if (_clientModel) {
+        this->clientModel = _clientModel;
+    }
+}

src/qt/bitcoingui.h

@@ -26,6 +26,7 @@ class PlatformStyle;
 class RPCConsole;
 class SendCoinsRecipient;
 class UnitDisplayStatusBarControl;
+class NetworkToggleStatusBarControl;
 class WalletFrame;
 class WalletModel;
 class HelpMessageDialog;
@@ -85,7 +86,7 @@ private:
     UnitDisplayStatusBarControl *unitDisplayControl;
     QLabel *labelWalletEncryptionIcon;
     QLabel *labelWalletHDStatusIcon;
-    QLabel *labelConnectionsIcon;
+    NetworkToggleStatusBarControl *connectionsControl;
     QLabel *labelBlocksIcon;
     QLabel *progressBarLabel;
     QProgressBar *progressBar;
@@ -146,6 +147,9 @@ private:
     /** Disconnect core signals from GUI client */
     void unsubscribeFromCoreSignals();
 
+    /** Update UI with latest network info from model. */
+    void updateNetworkState();
+
 Q_SIGNALS:
     /** Signal raised when a URI was entered or dragged to the GUI */
     void receivedURI(const QString &uri);
@@ -153,6 +157,8 @@ Q_SIGNALS:
 public Q_SLOTS:
     /** Set number of connections shown in the UI */
     void setNumConnections(int count);
+    /** Set network state shown in the UI */
+    void setNetworkActive(bool networkActive);
     /** Set number of blocks and last block date shown in the UI */
     void setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool headers);
 
@@ -264,4 +270,17 @@ private Q_SLOTS:
     void onMenuSelection(QAction* action);
 };
 
+class NetworkToggleStatusBarControl : public QLabel
+{
+    Q_OBJECT
+    
+public:
+    void setClientModel(ClientModel *clientModel);
+protected:
+    void mousePressEvent(QMouseEvent *event);
+    
+private:
+    ClientModel *clientModel;
+};
+
 #endif // BITCOIN_QT_BITCOINGUI_H

src/qt/clientmodel.cpp

@@ -145,6 +145,11 @@ void ClientModel::updateNumConnections(int numConnections)
     Q_EMIT numConnectionsChanged(numConnections);
 }
 
+void ClientModel::updateNetworkActive(bool networkActive)
+{
+    Q_EMIT networkActiveChanged(networkActive);
+}
+
 void ClientModel::updateAlert()
 {
     Q_EMIT alertsChanged(getStatusBarWarnings());
@@ -167,6 +172,21 @@ enum BlockSource ClientModel::getBlockSource() const
     return BLOCK_SOURCE_NONE;
 }
 
+void ClientModel::setNetworkActive(bool active)
+{
+    if (g_connman) {
+         g_connman->SetNetworkActive(active);
+    }
+}
+
+bool ClientModel::getNetworkActive() const
+{
+    if (g_connman) {
+        return g_connman->GetNetworkActive();
+    }
+    return false;
+}
+
 QString ClientModel::getStatusBarWarnings() const
 {
     return QString::fromStdString(GetWarnings("gui"));
@@ -233,6 +253,12 @@ static void NotifyNumConnectionsChanged(ClientModel *clientmodel, int newNumConn
                               Q_ARG(int, newNumConnections));
 }
 
+static void NotifyNetworkActiveChanged(ClientModel *clientmodel, bool networkActive)
+{
+    QMetaObject::invokeMethod(clientmodel, "updateNetworkActive", Qt::QueuedConnection,
+                              Q_ARG(bool, networkActive));
+}
+
 static void NotifyAlertChanged(ClientModel *clientmodel)
 {
     qDebug() << "NotifyAlertChanged";
@@ -273,6 +299,7 @@ void ClientModel::subscribeToCoreSignals()
     // Connect signals to client
     uiInterface.ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
     uiInterface.NotifyNumConnectionsChanged.connect(boost::bind(NotifyNumConnectionsChanged, this, _1));
+    uiInterface.NotifyNetworkActiveChanged.connect(boost::bind(NotifyNetworkActiveChanged, this, _1));
     uiInterface.NotifyAlertChanged.connect(boost::bind(NotifyAlertChanged, this));
     uiInterface.BannedListChanged.connect(boost::bind(BannedListChanged, this));
     uiInterface.NotifyBlockTip.connect(boost::bind(BlockTipChanged, this, _1, _2, false));
@@ -284,6 +311,7 @@ void ClientModel::unsubscribeFromCoreSignals()
     // Disconnect signals from client
     uiInterface.ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
     uiInterface.NotifyNumConnectionsChanged.disconnect(boost::bind(NotifyNumConnectionsChanged, this, _1));
+    uiInterface.NotifyNetworkActiveChanged.disconnect(boost::bind(NotifyNetworkActiveChanged, this, _1));
     uiInterface.NotifyAlertChanged.disconnect(boost::bind(NotifyAlertChanged, this));
     uiInterface.BannedListChanged.disconnect(boost::bind(BannedListChanged, this));
     uiInterface.NotifyBlockTip.disconnect(boost::bind(BlockTipChanged, this, _1, _2, false));

src/qt/clientmodel.h

@@ -68,6 +68,10 @@ public:
     bool inInitialBlockDownload() const;
     //! Return true if core is importing blocks
     enum BlockSource getBlockSource() const;
+    //! Return true if network activity in core is enabled
+    bool getNetworkActive() const;
+    //! Toggle network activity state in core
+    void setNetworkActive(bool active);
     //! Return warnings to be displayed in status bar
     QString getStatusBarWarnings() const;
 
@@ -91,6 +95,7 @@ Q_SIGNALS:
     void numConnectionsChanged(int count);
     void numBlocksChanged(int count, const QDateTime& blockDate, double nVerificationProgress, bool header);
     void mempoolSizeChanged(long count, size_t mempoolSizeInBytes);
+    void networkActiveChanged(bool networkActive);
     void alertsChanged(const QString &warnings);
     void bytesChanged(quint64 totalBytesIn, quint64 totalBytesOut);
 
@@ -103,6 +108,7 @@ Q_SIGNALS:
 public Q_SLOTS:
     void updateTimer();
     void updateNumConnections(int numConnections);
+    void updateNetworkActive(bool networkActive);
     void updateAlert();
     void updateBanlist();
 };

src/qt/res/src/network_disabled.svg

@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg2"
+   viewBox="0 0 24 24"
+   height="24"
+   width="24"
+   version="1.2">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <g
+     id="g4142"
+     transform="matrix(0,-1,-1,0,23.96,24)">
+    <g
+       id="g4210"
+       transform="matrix(-1,0,0,1,59.86,-106.6)">
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+</svg>

src/qt/rpcconsole.cpp

@@ -458,6 +458,9 @@ void RPCConsole::setClientModel(ClientModel *model)
         setNumBlocks(model->getNumBlocks(), model->getLastBlockDate(), model->getVerificationProgress(NULL), false);
         connect(model, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
 
+        updateNetworkState();
+        connect(model, SIGNAL(networkActiveChanged(bool)), this, SLOT(setNetworkActive(bool)));
+
         updateTrafficStats(model->getTotalBytesRecv(), model->getTotalBytesSent());
         connect(model, SIGNAL(bytesChanged(quint64,quint64)), this, SLOT(updateTrafficStats(quint64, quint64)));
 
@@ -674,16 +677,30 @@ void RPCConsole::message(int category, const QString &message, bool html)
     ui->messagesWidget->append(out);
 }
 
+void RPCConsole::updateNetworkState()
+{
+    QString connections = QString::number(clientModel->getNumConnections()) + " (";
+    connections += tr("In:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_IN)) + " / ";
+    connections += tr("Out:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_OUT)) + ")";
+
+    if(!clientModel->getNetworkActive()) {
+        connections += " (" + tr("Network activity disabled") + ")";
+    }
+
+    ui->numberOfConnections->setText(connections);
+}
+
 void RPCConsole::setNumConnections(int count)
 {
     if (!clientModel)
         return;
 
-    QString connections = QString::number(count) + " (";
-    connections += tr("In:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_IN)) + " / ";
-    connections += tr("Out:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_OUT)) + ")";
+    updateNetworkState();
+}
 
-    ui->numberOfConnections->setText(connections);
+void RPCConsole::setNetworkActive(bool networkActive)
+{
+    updateNetworkState();
 }
 
 void RPCConsole::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool headers)
@@ -1069,3 +1086,8 @@ void RPCConsole::setTabFocus(enum TabTypes tabType)
 {
     ui->tabWidget->setCurrentIndex(tabType);
 }
+
+void RPCConsole::on_toggleNetworkActiveButton_clicked()
+{
+    clientModel->setNetworkActive(!clientModel->getNetworkActive());
+}

src/qt/rpcconsole.h

@@ -61,6 +61,8 @@ protected:
 private Q_SLOTS:
     void on_lineEdit_returnPressed();
     void on_tabWidget_currentChanged(int index);
+    /** toggle network activity */
+    void on_toggleNetworkActiveButton_clicked();
     /** open the debug.log from the current datadir */
     void on_openDebugLogfileButton_clicked();
     /** change the time range of the network traffic graph */
@@ -88,6 +90,8 @@ public Q_SLOTS:
     void message(int category, const QString &message, bool html = false);
     /** Set number of connections shown in the UI */
     void setNumConnections(int count);
+    /** Set network state shown in the UI */
+    void setNetworkActive(bool networkActive);
     /** Set number of blocks and last block date shown in the UI */
     void setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool headers);
     /** Set size (number of transactions and memory usage) of the mempool in the UI */
@@ -144,6 +148,9 @@ private:
     QMenu *banTableContextMenu;
     int consoleFontSize;
     QCompleter *autoCompleter;
+
+    /** Update UI with latest network info from model. */
+    void updateNetworkState();
 };
 
 #endif // BITCOIN_QT_RPCCONSOLE_H

src/rpc/client.cpp

@@ -109,6 +109,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "prioritisetransaction", 2 },
     { "setban", 2 },
     { "setban", 3 },
+    { "setnetworkactive", 0 },
     { "getmempoolancestors", 1 },
     { "getmempooldescendants", 1 },
 };

src/rpc/net.cpp

@@ -401,6 +401,7 @@ UniValue getnetworkinfo(const JSONRPCRequest& request)
             "  \"localrelay\": true|false,              (bool) true if transaction relay is requested from peers\n"
             "  \"timeoffset\": xxxxx,                   (numeric) the time offset\n"
             "  \"connections\": xxxxx,                  (numeric) the number of connections\n"
+            "  \"networkactive\": true|false,           (bool) whether p2p networking is enabled\n"
             "  \"networks\": [                          (array) information per network\n"
             "  {\n"
             "    \"name\": \"xxx\",                     (string) network (ipv4, ipv6 or onion)\n"
@@ -435,8 +436,10 @@ UniValue getnetworkinfo(const JSONRPCRequest& request)
         obj.push_back(Pair("localservices", strprintf("%016x", g_connman->GetLocalServices())));
     obj.push_back(Pair("localrelay",     fRelayTxes));
     obj.push_back(Pair("timeoffset",    GetTimeOffset()));
-    if(g_connman)
+    if (g_connman) {
+        obj.push_back(Pair("networkactive", g_connman->GetNetworkActive()));
         obj.push_back(Pair("connections",   (int)g_connman->GetNodeCount(CConnman::CONNECTIONS_ALL)));
+    }
     obj.push_back(Pair("networks",      GetNetworksInfo()));
     obj.push_back(Pair("relayfee",      ValueFromAmount(::minRelayTxFee.GetFeePerK())));
     UniValue localAddresses(UniValue::VARR);
@@ -571,6 +574,24 @@ UniValue clearbanned(const JSONRPCRequest& request)
     return NullUniValue;
 }
 
+UniValue setnetworkactive(const JSONRPCRequest& request)
+{
+    if (request.fHelp || request.params.size() != 1) {
+        throw runtime_error(
+            "setnetworkactive true|false\n"
+            "Disable/enable all p2p network activity."
+        );
+    }
+
+    if (!g_connman) {
+        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
+    }
+
+    g_connman->SetNetworkActive(request.params[0].get_bool());
+
+    return g_connman->GetNetworkActive();
+}
+
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         okSafeMode
   //  --------------------- ------------------------  -----------------------  ----------
@@ -585,6 +606,7 @@ static const CRPCCommand commands[] =
     { "network",            "setban",                 &setban,                 true  },
     { "network",            "listbanned",             &listbanned,             true  },
     { "network",            "clearbanned",            &clearbanned,            true  },
+    { "network",            "setnetworkactive",       &setnetworkactive,       true, },
 };
 
 void RegisterNetRPCCommands(CRPCTable &t)

src/test/rpc_tests.cpp

@@ -84,6 +84,28 @@ BOOST_AUTO_TEST_CASE(rpc_rawparams)
     BOOST_CHECK_THROW(CallRPC(string("sendrawtransaction ")+rawtx+" extra"), runtime_error);
 }
 
+BOOST_AUTO_TEST_CASE(rpc_togglenetwork)
+{
+    UniValue r;
+
+    r = CallRPC("getnetworkinfo");
+    bool netState = find_value(r.get_obj(), "networkactive").get_bool();
+    BOOST_CHECK_EQUAL(netState, true);
+
+    BOOST_CHECK_NO_THROW(CallRPC("setnetworkactive false"));
+    r = CallRPC("getnetworkinfo");
+    int numConnection = find_value(r.get_obj(), "connections").get_int();
+    BOOST_CHECK_EQUAL(numConnection, 0);
+
+    netState = find_value(r.get_obj(), "networkactive").get_bool();
+    BOOST_CHECK_EQUAL(netState, false);
+
+    BOOST_CHECK_NO_THROW(CallRPC("setnetworkactive true"));
+    r = CallRPC("getnetworkinfo");
+    netState = find_value(r.get_obj(), "networkactive").get_bool();
+    BOOST_CHECK_EQUAL(netState, true);
+}
+
 BOOST_AUTO_TEST_CASE(rpc_rawsign)
 {
     UniValue r;

src/ui_interface.h

@@ -85,6 +85,9 @@ public:
     /** Number of network connections changed. */
     boost::signals2::signal<void (int newNumConnections)> NotifyNumConnectionsChanged;
 
+    /** Network activity state changed. */
+    boost::signals2::signal<void (bool networkActive)> NotifyNetworkActiveChanged;
+
     /**
      * Status bar alerts changed.
      */