Merge bitcoin-core/gui#543: peers-tab: add connection duration column to tableview

51708c4516cb9d52e84dc8850d93f556dda1a75b gui: peersWidget - ResizeToContents Age and IP/Netmask columns (randymcmillan)
209301a442512579d57f79c82417dc7c496248b6 gui: add Age column to peers tab (randymcmillan)
127de22c5fb396e1670d2a911faf7a9adc9241e2 gui: add FormatPeerAge() utility helper (Jon Atack)

Pull request description:

  This change adds an "Age" column to the peers table view,
  which displays the duration of each peer's connection.

ACKs for top commit:
  jonatack:
    re-ACK  51708c4516cb9d52e84dc8850d93f556dda1a75b
  Jamewood:
    > re-ACK 51708c4
  shaavan:
    reACK 51708c4516cb9d52e84dc8850d93f556dda1a75b
  hebasto:
    ACK 51708c4516cb9d52e84dc8850d93f556dda1a75b, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 27323f7080ec0d3fcdbf1b190fba1cd2d7406840ab6607c221cf8af950db9134e22721cc5a88f4fc4f390d8b05e98bc4b7521661a31fadad9e2c6c6390e71788

src/qt/guiutil.cpp

@@ -89,6 +89,8 @@
 void ForceActivation();
 #endif
 
+using namespace std::chrono_literals;
+
 namespace GUIUtil {
 
 static RecursiveMutex cs_css;
@@ -1729,6 +1731,16 @@ QString formatDurationStr(std::chrono::seconds dur)
     return str_list.join(" ");
 }
 
+QString FormatPeerAge(std::chrono::seconds time_connected)
+{
+    const auto time_now{GetTime<std::chrono::seconds>()};
+    const auto age{time_now - time_connected};
+    if (age >= 24h) return QObject::tr("%1 d").arg(age / 24h);
+    if (age >= 1h) return QObject::tr("%1 h").arg(age / 1h);
+    if (age >= 1min) return QObject::tr("%1 m").arg(age / 1min);
+    return QObject::tr("%1 s").arg(age / 1s);
+}
+
 QString formatServicesStr(quint64 mask)
 {
     QStringList strList;

src/qt/guiutil.h

@@ -420,6 +420,9 @@ namespace GUIUtil
     /** Convert seconds into a QString with days, hours, mins, secs */
     QString formatDurationStr(std::chrono::seconds dur);
 
+    /** Convert peer connection time to a QString denominated in the most relevant unit. */
+    QString FormatPeerAge(std::chrono::seconds time_connected);
+
     /** Format CNodeStats.nServices bitmask into a user-readable string */
     QString formatServicesStr(quint64 mask);
 

src/qt/peertablemodel.cpp

@@ -71,6 +71,8 @@ QVariant PeerTableModel::data(const QModelIndex& index, int role) const
         switch (column) {
         case NetNodeId:
             return (qint64)rec->nodeStats.nodeid;
+        case Age:
+            return GUIUtil::FormatPeerAge(rec->nodeStats.m_connected);
         case Address:
             // prepend to peer address down-arrow symbol for inbound connection and up-arrow for outbound connection
             return QString::fromStdString((rec->nodeStats.fInbound ? "↓ " : "↑ ") + rec->nodeStats.m_addr_name);
@@ -91,6 +93,7 @@ QVariant PeerTableModel::data(const QModelIndex& index, int role) const
     } else if (role == Qt::TextAlignmentRole) {
         switch (column) {
         case NetNodeId:
+        case Age:
             return QVariant(Qt::AlignRight | Qt::AlignVCenter);
         case Address:
             return {};

src/qt/peertablemodel.h

@@ -47,6 +47,7 @@ public:
 
     enum ColumnIndex {
         NetNodeId = 0,
+        Age,
         Address,
         ConnectionType,
         Network,
@@ -84,6 +85,9 @@ private:
         /*: Title of Peers Table column which contains a
             unique number used to identify a connection. */
         tr("Peer"),
+        /*: Title of Peers Table column which indicates the duration (length of time)
+            since the peer connection started. */
+        tr("Age"),
         /*: Title of Peers Table column which contains the
             IP/Onion/I2P address of the connected peer. */
         tr("Address"),

src/qt/peertablesortproxy.cpp

@@ -24,6 +24,8 @@ bool PeerTableSortProxy::lessThan(const QModelIndex& left_index, const QModelInd
     switch (static_cast<PeerTableModel::ColumnIndex>(left_index.column())) {
     case PeerTableModel::NetNodeId:
         return left_stats.nodeid < right_stats.nodeid;
+    case PeerTableModel::Age:
+        return left_stats.m_connected > right_stats.m_connected;
     case PeerTableModel::Address:
         return left_stats.m_addr_name.compare(right_stats.m_addr_name) < 0;
     case PeerTableModel::ConnectionType:

src/qt/rpcconsole.cpp

@@ -713,6 +713,7 @@ void RPCConsole::setClientModel(ClientModel *model, int bestblock_height, int64_
             ui->peerWidget->setColumnWidth(PeerTableModel::Subversion, SUBVERSION_COLUMN_WIDTH);
             ui->peerWidget->setColumnWidth(PeerTableModel::Ping, PING_COLUMN_WIDTH);
         }
+        ui->peerWidget->horizontalHeader()->setSectionResizeMode(PeerTableModel::Age, QHeaderView::ResizeToContents);
         ui->peerWidget->horizontalHeader()->setStretchLastSection(true);
         ui->peerWidget->setItemDelegateForColumn(PeerTableModel::NetNodeId, new PeerIdViewDelegate(this));
 
@@ -745,6 +746,7 @@ void RPCConsole::setClientModel(ClientModel *model, int bestblock_height, int64_
             ui->banlistWidget->setColumnWidth(BanTableModel::Address, BANSUBNET_COLUMN_WIDTH);
             ui->banlistWidget->setColumnWidth(BanTableModel::Bantime, BANTIME_COLUMN_WIDTH);
         }
+        ui->banlistWidget->horizontalHeader()->setSectionResizeMode(BanTableModel::Address, QHeaderView::ResizeToContents);
         ui->banlistWidget->horizontalHeader()->setStretchLastSection(true);
 
         // create ban table context menu