Merge bitcoin-core/gui#825: Show maximum mempool size in information window

4a028cf54c gui: show maximum mempool size in information window (Sebastian Falbesoner)
bbde6ffefe add node interface method for getting maximum mempool size (Sebastian Falbesoner)

Pull request description:

  This PR adds the maximum mempool size to the information window (Menu "Window" -> "Information" -> section "Memory Pool" -> line "Memory usage").

  master:

  ![image](https://github.com/bitcoin-core/gui/assets/91535/157e92f5-7d06-4303-b4ef-bcdfac5527e3)

  PR:

  ![image](https://github.com/bitcoin-core/gui/assets/91535/796322aa-9f16-4b09-9893-bf52a3898a5c)

ACKs for top commit:
  MarnixCroes:
    tested ACK 4a028cf54c
  pablomartin4btc:
    tACK 4a028cf54c
  luke-jr:
    tACK 4a028cf54c & in Knots
  hebasto:
    ACK 4a028cf54c, tested on Ubuntu 24.04.

Tree-SHA512: c10fb23605d060cea19a86d11822fc4d12496b19547870052aace503670e62e4c4e19ae4c2c4fbf7420a472adb071c9ddebe82447e0cfbce5a6fb9fcd7b9eda3

src/interfaces/node.h

@@ -162,6 +162,9 @@ public:
     //! Get mempool dynamic usage.
     virtual size_t getMempoolDynamicUsage() = 0;
 
+    //! Get mempool maximum memory usage.
+    virtual size_t getMempoolMaxUsage() = 0;
+
     //! Get header tip height and time.
     virtual bool getHeaderTip(int& height, int64_t& block_time) = 0;
 

src/node/interfaces.cpp

@@ -278,6 +278,7 @@ public:
     int64_t getTotalBytesSent() override { return m_context->connman ? m_context->connman->GetTotalBytesSent() : 0; }
     size_t getMempoolSize() override { return m_context->mempool ? m_context->mempool->size() : 0; }
     size_t getMempoolDynamicUsage() override { return m_context->mempool ? m_context->mempool->DynamicMemoryUsage() : 0; }
+    size_t getMempoolMaxUsage() override { return m_context->mempool ? m_context->mempool->m_opts.max_size_bytes : 0; }
     bool getHeaderTip(int& height, int64_t& block_time) override
     {
         LOCK(::cs_main);

src/qt/clientmodel.cpp

@@ -53,7 +53,7 @@ ClientModel::ClientModel(interfaces::Node& node, OptionsModel *_optionsModel, QO
     connect(timer, &QTimer::timeout, [this] {
         // no locking required at this point
         // the following calls will acquire the required lock
-        Q_EMIT mempoolSizeChanged(m_node.getMempoolSize(), m_node.getMempoolDynamicUsage());
+        Q_EMIT mempoolSizeChanged(m_node.getMempoolSize(), m_node.getMempoolDynamicUsage(), m_node.getMempoolMaxUsage());
         Q_EMIT bytesChanged(m_node.getTotalBytesRecv(), m_node.getTotalBytesSent());
     });
     connect(m_thread, &QThread::finished, timer, &QObject::deleteLater);

src/qt/clientmodel.h

@@ -113,7 +113,7 @@ private:
 Q_SIGNALS:
     void numConnectionsChanged(int count);
     void numBlocksChanged(int count, const QDateTime& blockDate, double nVerificationProgress, SyncType header, SynchronizationState sync_state);
-    void mempoolSizeChanged(long count, size_t mempoolSizeInBytes);
+    void mempoolSizeChanged(long count, size_t mempoolSizeInBytes, size_t mempoolMaxSizeInBytes);
     void networkActiveChanged(bool networkActive);
     void alertsChanged(const QString &warnings);
     void bytesChanged(quint64 totalBytesIn, quint64 totalBytesOut);

src/qt/rpcconsole.cpp

@@ -1000,15 +1000,16 @@ void RPCConsole::setNumBlocks(int count, const QDateTime& blockDate, double nVer
     }
 }
 
-void RPCConsole::setMempoolSize(long numberOfTxs, size_t dynUsage)
+void RPCConsole::setMempoolSize(long numberOfTxs, size_t dynUsage, size_t maxUsage)
 {
     ui->mempoolNumberTxs->setText(QString::number(numberOfTxs));
 
-    if (dynUsage < 1000000) {
-        ui->mempoolSize->setText(QObject::tr("%1 kB").arg(dynUsage / 1000.0, 0, 'f', 2));
-    } else {
-        ui->mempoolSize->setText(QObject::tr("%1 MB").arg(dynUsage / 1000000.0, 0, 'f', 2));
-    }
+    const auto cur_usage_str = dynUsage < 1000000 ?
+        QObject::tr("%1 kB").arg(dynUsage / 1000.0, 0, 'f', 2) :
+        QObject::tr("%1 MB").arg(dynUsage / 1000000.0, 0, 'f', 2);
+    const auto max_usage_str = QObject::tr("%1 MB").arg(maxUsage / 1000000.0, 0, 'f', 2);
+
+    ui->mempoolSize->setText(cur_usage_str + " / " + max_usage_str);
 }
 
 void RPCConsole::on_lineEdit_returnPressed()
@@ -1400,4 +1401,4 @@ void RPCConsole::updateWindowTitle()
     const QString chainType = QString::fromStdString(Params().GetChainTypeString());
     const QString title = tr("Node window - [%1]").arg(chainType);
     this->setWindowTitle(title);
-}
+}

src/qt/rpcconsole.h

@@ -121,7 +121,7 @@ public Q_SLOTS:
     /** Set number of blocks and last block date shown in the UI */
     void setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, SyncType synctype);
     /** Set size (number of transactions and memory usage) of the mempool in the UI */
-    void setMempoolSize(long numberOfTxs, size_t dynUsage);
+    void setMempoolSize(long numberOfTxs, size_t dynUsage, size_t maxUsage);
     /** Go forward or back in history */
     void browseHistory(int offset);
     /** Scroll console view to end */