feat(chain): implement default index_tx method

Co-authored-by: 志宇 <hello@evanlinjin.me>

crates/chain/src/indexed_tx_graph.rs

@@ -44,6 +44,18 @@ impl<A, I> IndexedTxGraph<A, I> {
 }
 
 impl<A: Anchor, I: Indexer> IndexedTxGraph<A, I> {
+ /// Determines the [`ChangeSet`] between `self` and an empty [`IndexedTxGraph`].
+ pub fn initial_changeset(&self) -> ChangeSet<A, I::ChangeSet> {
+ let graph = self.graph.initial_changeset();
+ let indexer = self.index.initial_changeset();
+ ChangeSet { graph, indexer }
+ }
+}
+
+impl<A: Anchor, I: Indexer> IndexedTxGraph<A, I>
+where
+ I::ChangeSet: Default + Append,
+{
  /// Applies the [`ChangeSet`] to the [`IndexedTxGraph`].
  pub fn apply_changeset(&mut self, changeset: ChangeSet<A, I::ChangeSet>) {
  self.index.apply_changeset(changeset.indexer);
@@ -58,18 +70,6 @@ impl<A: Anchor, I: Indexer> IndexedTxGraph<A, I> {
  self.graph.apply_changeset(changeset.graph);
  }
 
- /// Determines the [`ChangeSet`] between `self` and an empty [`IndexedTxGraph`].
- pub fn initial_changeset(&self) -> ChangeSet<A, I::ChangeSet> {
- let graph = self.graph.initial_changeset();
- let indexer = self.index.initial_changeset();
- ChangeSet { graph, indexer }
- }
-}
-
-impl<A: Anchor, I: Indexer> IndexedTxGraph<A, I>
-where
- I::ChangeSet: Default + Append,
-{
  fn index_tx_graph_changeset(
  &mut self,
  tx_graph_changeset: &tx_graph::ChangeSet<A>,
@@ -341,7 +341,16 @@ pub trait Indexer {
  fn index_txout(&mut self, outpoint: OutPoint, txout: &TxOut) -> Self::ChangeSet;
 
  /// Scans a transaction for relevant outpoints, which are stored and indexed internally.
- fn index_tx(&mut self, tx: &Transaction) -> Self::ChangeSet;
+ fn index_tx(&mut self, tx: &Transaction) -> Self::ChangeSet
+ where
+ Self::ChangeSet: Default + Append,
+ {
+ let mut changeset = Self::ChangeSet::default();
+ for (op, txout) in tx.output.iter().enumerate() {
+ changeset.append(self.index_txout(OutPoint::new(tx.txid(), op as u32), txout));
+ }
+ changeset
+ }
 
  /// Apply changeset to itself.
  fn apply_changeset(&mut self, changeset: Self::ChangeSet);

crates/chain/src/keychain/txout_index.rs

@@ -126,14 +126,6 @@ impl<K: Clone + Ord + Debug> Indexer for KeychainTxOutIndex<K> {
  }
  }
 
- fn index_tx(&mut self, tx: &bitcoin::Transaction) -> Self::ChangeSet {
- let mut changeset = super::ChangeSet::<K>::default();
- for (op, txout) in tx.output.iter().enumerate() {
- changeset.append(self.index_txout(OutPoint::new(tx.txid(), op as u32), txout));
- }
- changeset
- }
-
  fn initial_changeset(&self) -> Self::ChangeSet {
  super::ChangeSet(self.last_revealed.clone())
  }