Merge bitcoin#15730: rpc: Show scanning details in getwalletinfo

b6c748f doc: Add release notes for 15730 (João Barbosa)
d3e8458 rpc: Show scanning details in getwalletinfo (João Barbosa)
90e27ab wallet: Track current scanning progress (João Barbosa)
2ee811e wallet: Track scanning duration (João Barbosa)

Pull request description:

  Closes bitcoin#15724.

ACKs for commit b6c748:
  MarcoFalke:
    re-utACK b6c748f (Only change since my last review is rebase, adding release notes, and returning false instead of null)
  laanwj:
    utACK b6c748f
  jonatack:
    ACK b6c748f, only changes appear to be rebase for bitcoin#15730 (comment) and release notes.

Tree-SHA512: 8ee98f971c15f66ce8138fc92c55e51abc9faf01866a31ac7ce2ad766aa2bb88559eabee3b5815d645c84cdf1c19dc35ec03f31461e39bc5f6040edec0b87116

doc/release-notes-15730.md

@@ -0,0 +1,5 @@
+RPC changes
+-----------
+The RPC `getwalletinfo` response now includes the `scanning` key with an object
+if there is a scanning in progress or `false` otherwise. Currently the object
+has the scanning duration and progress.

src/wallet/rpcwallet.cpp

@@ -2462,6 +2462,11 @@ static UniValue getwalletinfo(const JSONRPCRequest& request)
             "  \"paytxfee\": x.xxxx,                (numeric) the transaction fee configuration, set in " + CURRENCY_UNIT + "/kB\n"
             "  \"hdseedid\": \"<hash160>\"            (string, optional) the Hash160 of the HD seed (only present when HD is enabled)\n"
             "  \"private_keys_enabled\": true|false (boolean) false if privatekeys are disabled for this wallet (enforced watch-only wallet)\n"
+            "  \"scanning\":                        (json object) current scanning details, or false if no scan is in progress\n"
+            "    {\n"
+            "      \"duration\" : xxxx              (numeric) elapsed seconds since scan start\n"
+            "      \"progress\" : x.xxxx,           (numeric) scanning progress percentage [0.0, 1.0]\n"
+            "    }\n"
             "}\n"
                 },
                 RPCExamples{
@@ -2505,6 +2510,14 @@ static UniValue getwalletinfo(const JSONRPCRequest& request)
         obj.pushKV("hdseedid", seed_id.GetHex());
     }
     obj.pushKV("private_keys_enabled", !pwallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS));
+    if (pwallet->IsScanning()) {
+        UniValue scanning(UniValue::VOBJ);
+        scanning.pushKV("duration", pwallet->ScanningDuration() / 1000);
+        scanning.pushKV("progress", pwallet->ScanningProgress());
+        obj.pushKV("scanning", scanning);
+    } else {
+        obj.pushKV("scanning", false);
+    }
     return obj;
 }
 

src/wallet/wallet.cpp

@@ -1786,8 +1786,9 @@ 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

@@ -596,6 +596,8 @@ class CWallet final : public CCryptoKeyStore, private interfaces::Chain::Notific
 private:
     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;
 
@@ -820,6 +822,8 @@ class CWallet final : public CCryptoKeyStore, private interfaces::Chain::Notific
     void AbortRescan() { fAbortRescan = true; }
     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
@@ -1241,6 +1245,8 @@ class WalletRescanReserver
         if (m_wallet->fScanningWallet) {
             return false;
         }
+        m_wallet->m_scanning_start = GetTimeMillis();
+        m_wallet->m_scanning_progress = 0;
         m_wallet->fScanningWallet = true;
         m_could_reserve = true;
         return true;