Introduce tx_graph::Update and simplify TxGraph update logic

crates/chain/src/indexed_tx_graph.rs

@@ -90,14 +90,36 @@ where
 
     /// Apply an `update` directly.
     ///
-    /// `update` is a [`TxGraph<A>`] and the resultant changes is returned as [`ChangeSet`].
-    pub fn apply_update(&mut self, update: TxGraph<A>) -> ChangeSet<A, I::ChangeSet> {
-        let graph = self.graph.apply_update(update);
-        let indexer = self.index_tx_graph_changeset(&graph);
-        ChangeSet {
-            tx_graph: graph,
-            indexer,
-        }
+    /// `update` is a [`tx_graph::Update<A>`] and the resultant changes is returned as [`ChangeSet`].
+    #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+    pub fn apply_update(&mut self, update: tx_graph::Update<A>) -> ChangeSet<A, I::ChangeSet> {
+        let tx_graph = self.graph.apply_update(update);
+        let indexer = self.index_tx_graph_changeset(&tx_graph);
+        ChangeSet { tx_graph, indexer }
+    }
+
+    /// Apply the given `update` with an optional `seen_at` timestamp.
+    ///
+    /// `seen_at` represents when the update is seen (in unix seconds). It is used to determine the
+    /// `last_seen`s for all transactions in the update which have no corresponding anchor(s). The
+    /// `last_seen` value is used internally to determine precedence of conflicting unconfirmed
+    /// transactions (where the transaction with the lower `last_seen` value is omitted from the
+    /// canonical history).
+    ///
+    /// Not setting a `seen_at` value means unconfirmed transactions introduced by this update will
+    /// not be part of the canonical history of transactions.
+    ///
+    /// Use [`apply_update`](IndexedTxGraph::apply_update) to have the `seen_at` value automatically
+    /// set to the current time.
+    pub fn apply_update_at(
+        &mut self,
+        update: tx_graph::Update<A>,
+        seen_at: Option<u64>,
+    ) -> ChangeSet<A, I::ChangeSet> {
+        let tx_graph = self.graph.apply_update_at(update, seen_at);
+        let indexer = self.index_tx_graph_changeset(&tx_graph);
+        ChangeSet { tx_graph, indexer }
     }
 
     /// Insert a floating `txout` of given `outpoint`.

crates/chain/src/lib.rs

@@ -17,6 +17,12 @@
 //!
 //! [Bitcoin Dev Kit]: https://bitcoindevkit.org/
 
+// only enables the `doc_cfg` feature when the `docsrs` configuration attribute is defined
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![cfg_attr(
+    docsrs,
+    doc(html_logo_url = "https://github.com/bitcoindevkit/bdk/raw/master/static/bdk.png")
+)]
 #![no_std]
 #![warn(missing_docs)]
 

crates/chain/src/spk_client.rs

@@ -3,7 +3,7 @@ use crate::{
     alloc::{boxed::Box, collections::VecDeque, vec::Vec},
     collections::BTreeMap,
     local_chain::CheckPoint,
-    ConfirmationBlockTime, Indexed, TxGraph,
+    ConfirmationBlockTime, Indexed,
 };
 use bitcoin::{OutPoint, Script, ScriptBuf, Txid};
 
@@ -345,8 +345,8 @@ impl<I> SyncRequest<I> {
 #[must_use]
 #[derive(Debug)]
 pub struct SyncResult<A = ConfirmationBlockTime> {
-    /// The update to apply to the receiving [`TxGraph`].
-    pub graph_update: TxGraph<A>,
+    /// The update to apply to the receiving [`TxGraph`](crate::tx_graph::TxGraph).
+    pub graph_update: crate::tx_graph::Update<A>,
     /// The update to apply to the receiving [`LocalChain`](crate::local_chain::LocalChain).
     pub chain_update: Option<CheckPoint>,
 }
@@ -497,8 +497,8 @@ impl<K: Ord + Clone> FullScanRequest<K> {
 #[derive(Debug)]
 pub struct FullScanResult<K, A = ConfirmationBlockTime> {
     /// The update to apply to the receiving [`LocalChain`](crate::local_chain::LocalChain).
-    pub graph_update: TxGraph<A>,
-    /// The update to apply to the receiving [`TxGraph`].
+    pub graph_update: crate::tx_graph::Update<A>,
+    /// The update to apply to the receiving [`TxGraph`](crate::tx_graph::TxGraph).
     pub chain_update: Option<CheckPoint>,
     /// Last active indices for the corresponding keychains (`K`).
     pub last_active_indices: BTreeMap<K, u32>,