Dedup `confirmed_txs` `Vec`

[rust-lightning] / lightning-transaction-sync / src / esplora.rs

diff --git a/lightning-transaction-sync/src/esplora.rs b/lightning-transaction-sync/src/esplora.rs
index ffe6877920d588d84349fcc51ea97ac5964694c0..538918ada953f74e8170864be1a20f7a6e3bf7ad 100644 (file)
--- a/lightning-transaction-sync/src/esplora.rs
+++ b/lightning-transaction-sync/src/esplora.rs
@@ -267,10 +267,13 @@ where
                // First, check the confirmation status of registered transactions as well as the
                // status of dependent transactions of registered outputs.
 
-               let mut confirmed_txs = Vec::new();
+               let mut confirmed_txs: Vec<ConfirmedTx> = Vec::new();
 
                for txid in &sync_state.watched_transactions {
-                       if let Some(confirmed_tx) = maybe_await!(self.get_confirmed_tx(&txid, None, None))? {
+                       if confirmed_txs.iter().any(|ctx| ctx.txid == *txid) {
+                               continue;
+                       }
+                       if let Some(confirmed_tx) = maybe_await!(self.get_confirmed_tx(*txid, None, None))? {
                                confirmed_txs.push(confirmed_tx);
                        }
                }
@@ -281,9 +284,19 @@ where
                        {
                                if let Some(spending_txid) = output_status.txid {
                                        if let Some(spending_tx_status) = output_status.status {
+                                               if confirmed_txs.iter().any(|ctx| ctx.txid == spending_txid) {
+                                                       if spending_tx_status.confirmed {
+                                                               // Skip inserting duplicate ConfirmedTx entry
+                                                               continue;
+                                                       } else {
+                                                               log_trace!(self.logger, "Inconsistency: Detected previously-confirmed Tx {} as unconfirmed", spending_txid);
+                                                               return Err(InternalError::Inconsistency);
+                                                       }
+                                               }
+
                                                if let Some(confirmed_tx) = maybe_await!(self
                                                        .get_confirmed_tx(
-                                                               &spending_txid,
+                                                               spending_txid,
                                                                spending_tx_status.block_hash,
                                                                spending_tx_status.block_height,
                                                        ))?
@@ -306,7 +319,7 @@ where
 
        #[maybe_async]
        fn get_confirmed_tx(
-               &self, txid: &Txid, expected_block_hash: Option<BlockHash>, known_block_height: Option<u32>,
+               &self, txid: Txid, expected_block_hash: Option<BlockHash>, known_block_height: Option<u32>,
        ) -> Result<Option<ConfirmedTx>, InternalError> {
                if let Some(merkle_block) = maybe_await!(self.client.get_merkle_block(&txid))? {
                        let block_header = merkle_block.header;
@@ -321,7 +334,7 @@ where
                        let mut matches = Vec::new();
                        let mut indexes = Vec::new();
                        let _ = merkle_block.txn.extract_matches(&mut matches, &mut indexes);
-                       if indexes.len() != 1 || matches.len() != 1 || matches[0] != *txid {
+                       if indexes.len() != 1 || matches.len() != 1 || matches[0] != txid {
                                log_error!(self.logger, "Retrieved Merkle block for txid {} doesn't match expectations. This should not happen. Please verify server integrity.", txid);
                                return Err(InternalError::Failed);
                        }
@@ -329,14 +342,19 @@ where
                        // unwrap() safety: len() > 0 is checked above
                        let pos = *indexes.first().unwrap() as usize;
                        if let Some(tx) = maybe_await!(self.client.get_tx(&txid))? {
+                               if tx.txid() != txid {
+                                       log_error!(self.logger, "Retrieved transaction for txid {} doesn't match expectations. This should not happen. Please verify server integrity.", txid);
+                                       return Err(InternalError::Failed);
+                               }
+
                                if let Some(block_height) = known_block_height {
                                        // We can take a shortcut here if a previous call already gave us the height.
-                                       return Ok(Some(ConfirmedTx { tx, block_header, pos, block_height }));
+                                       return Ok(Some(ConfirmedTx { tx, txid, block_header, pos, block_height }));
                                }
 
                                let block_status = maybe_await!(self.client.get_block_status(&block_hash))?;
                                if let Some(block_height) = block_status.height {
-                                       return Ok(Some(ConfirmedTx { tx, block_header, pos, block_height }));
+                                       return Ok(Some(ConfirmedTx { tx, txid, block_header, pos, block_height }));
                                } else {
                                        // If any previously-confirmed block suddenly is no longer confirmed, we found
                                        // an inconsistency and should start over.