Change Mempool::get_txn() to contains()

src/mempool.rs

@@ -171,8 +171,8 @@ impl Tracker {
         }
     }
 
-    pub fn get_txn(&self, txid: &Sha256dHash) -> Option<Transaction> {
-        self.items.get(txid).map(|stats| stats.tx.clone())
+    pub fn contains(&self, txid: &Sha256dHash) -> bool {
+        self.items.contains_key(txid)
     }
 
     /// Returns vector of (fee_rate, vsize) pairs, where fee_{n-1} > fee_n and vsize_n is the

src/query.rs

@@ -319,7 +319,7 @@ impl Query {
         tx_hash: &Sha256dHash,
         block_height: Option<u32>,
     ) -> Result<Option<Sha256dHash>> {
-        let blockhash = if self.tracker.read().unwrap().get_txn(&tx_hash).is_some() {
+        let blockhash = if self.tracker.read().unwrap().contains(&tx_hash) {
             None // found in mempool (as unconfirmed transaction)
         } else {
             // Lookup in confirmed transactions' index