RPC: Add ancestor{count,size,fees} to listunspent output

src/wallet/rpcwallet.cpp

@@ -2880,6 +2880,9 @@ static RPCHelpMan listunspent()
                             {RPCResult::Type::STR, "scriptPubKey", "the script key"},
                             {RPCResult::Type::STR_AMOUNT, "amount", "the transaction output amount in " + CURRENCY_UNIT},
                             {RPCResult::Type::NUM, "confirmations", "The number of confirmations"},
+                            {RPCResult::Type::NUM, "ancestorcount", /* optional */ true, "The number of in-mempool ancestor transactions, including this one (if transaction is in the mempool)"},
+                            {RPCResult::Type::NUM, "ancestorsize", /* optional */ true, "The virtual transaction size of in-mempool ancestors, including this one (if transaction is in the mempool)"},
+                            {RPCResult::Type::STR_AMOUNT, "ancestorfees", /* optional */ true, "The total fees of in-mempool ancestors (including this one) with fee deltas used for mining priority in " + CURRENCY_ATOM + " (if transaction is in the mempool)"},
                             {RPCResult::Type::STR_HEX, "redeemScript", "The redeemScript if scriptPubKey is P2SH"},
                             {RPCResult::Type::STR, "witnessScript", "witnessScript if the scriptPubKey is P2WSH or P2SH-P2WSH"},
                             {RPCResult::Type::BOOL, "spendable", "Whether we have the private keys to spend this output"},
@@ -3046,6 +3049,16 @@ static RPCHelpMan listunspent()
         entry.pushKV("scriptPubKey", HexStr(scriptPubKey));
         entry.pushKV("amount", ValueFromAmount(out.tx->tx->vout[out.i].nValue));
         entry.pushKV("confirmations", out.nDepth);
+        if (!out.nDepth) {
+            size_t ancestor_count, descendant_count, ancestor_size;
+            CAmount ancestor_fees;
+            pwallet->chain().getTransactionAncestry(out.tx->GetHash(), ancestor_count, descendant_count, &ancestor_size, &ancestor_fees);
+            if (ancestor_count) {
+                entry.pushKV("ancestorcount", uint64_t(ancestor_count));
+                entry.pushKV("ancestorsize", uint64_t(ancestor_size));
+                entry.pushKV("ancestorfees", uint64_t(ancestor_fees));
+            }
+        }
         entry.pushKV("spendable", out.fSpendable);
         entry.pushKV("solvable", out.fSolvable);
         if (out.fSolvable) {