wallet: Track current scanning progress

Author: promag

src/wallet/wallet.cpp

@@ -1798,8 +1798,9 @@ CWallet::ScanResult CWallet::ScanForWalletTransactions(const uint256& start_bloc
     }
     double progress_current = progress_begin;
     while (block_height && !fAbortRescan && !chain().shutdownRequested()) {
+        m_scanning_progress = (progress_current - progress_begin) / (progress_end - progress_begin);
         if (*block_height % 100 == 0 && progress_end - progress_begin > 0.0) {
-            ShowProgress(strprintf("%s " + _("Rescanning..."), GetDisplayName()), std::max(1, std::min(99, (int)((progress_current - progress_begin) / (progress_end - progress_begin) * 100))));
+            ShowProgress(strprintf("%s " + _("Rescanning..."), GetDisplayName()), std::max(1, std::min(99, (int)(m_scanning_progress * 100))));
         }
         if (GetTime() >= nNow + 60) {
             nNow = GetTime();

src/wallet/wallet.h

@@ -597,6 +597,7 @@ class CWallet final : public CCryptoKeyStore, private interfaces::Chain::Notific
     std::atomic<bool> fAbortRescan{false};
     std::atomic<bool> fScanningWallet{false}; // controlled by WalletRescanReserver
     std::atomic<int64_t> m_scanning_start{0};
+    std::atomic<double> m_scanning_progress{0};
     std::mutex mutexScanning;
     friend class WalletRescanReserver;
 
@@ -822,6 +823,7 @@ class CWallet final : public CCryptoKeyStore, private interfaces::Chain::Notific
     bool IsAbortingRescan() { return fAbortRescan; }
     bool IsScanning() { return fScanningWallet; }
     int64_t ScanningDuration() const { return fScanningWallet ? GetTimeMillis() - m_scanning_start : 0; }
+    double ScanningProgress() const { return fScanningWallet ? (double) m_scanning_progress : 0; }
 
     /**
      * keystore implementation
@@ -1244,6 +1246,7 @@ class WalletRescanReserver
             return false;
         }
         m_wallet->m_scanning_start = GetTimeMillis();
+        m_wallet->m_scanning_progress = 0;
         m_wallet->fScanningWallet = true;
         m_could_reserve = true;
         return true;