From 593d58dc684ac1ac3806f654451c69e7784b5eb7 Mon Sep 17 00:00:00 2001
From: Tom Briar <tombriar08@Gmail.com>
Date: Wed, 6 Dec 2023 15:55:30 -0500
Subject: [PATCH] node: Added vector based coin lookup

---
 src/node/coin.cpp | 19 +++++++++++++++++++
 src/node/coin.h   | 13 +++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/src/node/coin.cpp b/src/node/coin.cpp
index 221854c5f67d5..056c68a9b39af 100644
--- a/src/node/coin.cpp
+++ b/src/node/coin.cpp
@@ -23,4 +23,23 @@ void FindCoins(const NodeContext& node, std::map<COutPoint, Coin>& coins)
         }
     }
 }
+
+std::vector<Coin> FindCoins(const node::NodeContext& node, const std::vector<COutPoint>& outpoints)
+{
+    assert(node.mempool);
+    assert(node.chainman);
+    LOCK2(cs_main, node.mempool->cs);
+    CCoinsViewCache& chain_view = node.chainman->ActiveChainstate().CoinsTip();
+    CCoinsViewMemPool mempool_view(&chain_view, *node.mempool);
+    std::vector<Coin> coins;
+    for (auto& outpoint : outpoints) {
+        Coin coin;
+        if (!mempool_view.GetCoin(outpoint, coin)) {
+            // Either the coin is not in the CCoinsViewCache or is spent. Clear it.
+            coin.Clear();
+        }
+        coins.push_back(coin);
+    }
+    return coins;
+}
 } // namespace node
diff --git a/src/node/coin.h b/src/node/coin.h
index b32e410e1cceb..9c3213b69efa9 100644
--- a/src/node/coin.h
+++ b/src/node/coin.h
@@ -6,6 +6,7 @@
 #define BITCOIN_NODE_COIN_H
 
 #include <map>
+#include <vector>
 
 class COutPoint;
 class Coin;
@@ -22,6 +23,18 @@ struct NodeContext;
  * @param[in,out] coins map to fill
  */
 void FindCoins(const node::NodeContext& node, std::map<COutPoint, Coin>& coins);
+
+/**
+ * Look up unspent output information. Returns coins in the mempool and in the
+ * current chain UTXO set. Iterates through all the outpoints and
+ * returns the corresponding coins.
+ *
+ * @param[in] node The node context to use for lookup
+ * @param[in] outpoints A Vector containing outpoints
+ */
+std::vector<Coin> FindCoins(const node::NodeContext& node, const std::vector<COutPoint>& outpoints);
 } // namespace node
 
+
+
 #endif // BITCOIN_NODE_COIN_H