wallet: Use scriptPubKey cache in IsMine

Author: achow101

src/wallet/wallet.cpp

@@ -1571,11 +1571,22 @@ isminetype CWallet::IsMine(const CTxDestination& dest) const
 isminetype CWallet::IsMine(const CScript& script) const
 {
     AssertLockHeld(cs_wallet);
-    isminetype result = ISMINE_NO;
-    for (const auto& spk_man_pair : m_spk_managers) {
-        result = std::max(result, spk_man_pair.second->IsMine(script));
+
+    // Search the cache so that IsMine is called only on the relevant SPKMs instead of on everything in m_spk_managers
+    const auto& it = m_cached_spks.find(script);
+    if (it != m_cached_spks.end()) {
+        isminetype res = ISMINE_NO;
+        for (const auto& spkm : it->second) {
+            res = std::max(res, spkm->IsMine(script));
+        }
+        Assume(res == ISMINE_SPENDABLE);
+        return res;
     }
-    return result;
+
+    // Legacy wallet
+    if (IsLegacy()) return GetLegacyScriptPubKeyMan()->IsMine(script);
+
+    return ISMINE_NO;
 }
 
 bool CWallet::IsMine(const CTransaction& tx) const