Add FindScriptPubKey() to search the UTXO set

Author: jonasschnelli

src/rpc/blockchain.cpp

@@ -1916,6 +1916,35 @@ static UniValue savemempool(const JSONRPCRequest& request)
     return NullUniValue;
 }
 
+//! Search for a given set of pubkey scripts
+bool FindScriptPubKey(std::atomic<int>& scan_progress, const std::atomic<bool>& should_abort, int64_t& count, CCoinsViewCursor* cursor, const std::set<CScript>& needles, std::map<COutPoint, Coin>& out_results) {
+    scan_progress = 0;
+    count = 0;
+    while (cursor->Valid()) {
+        COutPoint key;
+        Coin coin;
+        if (!cursor->GetKey(key) || !cursor->GetValue(coin)) return false;
+        if (++count % 8192 == 0) {
+            boost::this_thread::interruption_point();
+            if (should_abort) {
+                // allow to abort the scan via the abort reference
+                return false;
+            }
+        }
+        if (count % 256 == 0) {
+            // update progress reference every 256 item
+            uint32_t high = 0x100 * *key.hash.begin() + *(key.hash.begin() + 1);
+            scan_progress = (int)(high * 100.0 / 65536.0 + 0.5);
+        }
+        if (needles.count(coin.out.scriptPubKey)) {
+            out_results.emplace(key, coin);
+        }
+        cursor->Next();
+    }
+    scan_progress = 100;
+    return true;
+}
+
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------