628 lines
26 KiB
Rust
628 lines
26 KiB
Rust
use crate::{
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collections::*,
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indexed_tx_graph::Indexer,
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miniscript::{Descriptor, DescriptorPublicKey},
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spk_iter::BIP32_MAX_INDEX,
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SpkIterator, SpkTxOutIndex,
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};
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use bitcoin::{OutPoint, Script, Transaction, TxOut};
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use core::fmt::Debug;
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use crate::Append;
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const DEFAULT_LOOKAHEAD: u32 = 1_000;
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/// [`KeychainTxOutIndex`] controls how script pubkeys are revealed for multiple keychains, and
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/// indexes [`TxOut`]s with them.
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///
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/// A single keychain is a chain of script pubkeys derived from a single [`Descriptor`]. Keychains
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/// are identified using the `K` generic. Script pubkeys are identified by the keychain that they
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/// are derived from `K`, as well as the derivation index `u32`.
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///
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/// # Revealed script pubkeys
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///
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/// Tracking how script pubkeys are revealed is useful for collecting chain data. For example, if
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/// the user has requested 5 script pubkeys (to receive money with), we only need to use those
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/// script pubkeys to scan for chain data.
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///
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/// Call [`reveal_to_target`] or [`reveal_next_spk`] to reveal more script pubkeys.
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/// Call [`revealed_keychain_spks`] or [`revealed_spks`] to iterate through revealed script pubkeys.
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///
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/// # Lookahead script pubkeys
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///
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/// When an user first recovers a wallet (i.e. from a recovery phrase and/or descriptor), we will
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/// NOT have knowledge of which script pubkeys are revealed. So when we index a transaction or
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/// txout (using [`index_tx`]/[`index_txout`]) we scan the txouts against script pubkeys derived
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/// above the last revealed index. These additionally-derived script pubkeys are called the
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/// lookahead.
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///
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/// The [`KeychainTxOutIndex`] is constructed with the `lookahead` and cannot be altered. The
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/// default `lookahead` count is 1000. Use [`new`] to set a custom `lookahead`.
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///
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/// # Unbounded script pubkey iterator
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///
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/// For script-pubkey-based chain sources (such as Electrum/Esplora), an initial scan is best done
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/// by iterating though derived script pubkeys one by one and requesting transaction histories for
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/// each script pubkey. We will stop after x-number of script pubkeys have empty histories. An
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/// unbounded script pubkey iterator is useful to pass to such a chain source.
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///
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/// Call [`unbounded_spk_iter`] to get an unbounded script pubkey iterator for a given keychain.
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/// Call [`all_unbounded_spk_iters`] to get unbounded script pubkey iterators for all keychains.
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///
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/// # Change sets
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///
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/// Methods that can update the last revealed index will return [`super::ChangeSet`] to report
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/// these changes. This can be persisted for future recovery.
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///
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/// ## Synopsis
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///
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/// ```
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/// use bdk_chain::keychain::KeychainTxOutIndex;
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/// # use bdk_chain::{ miniscript::{Descriptor, DescriptorPublicKey} };
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/// # use core::str::FromStr;
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///
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/// // imagine our service has internal and external addresses but also addresses for users
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/// #[derive(Clone, Debug, PartialEq, Eq, Ord, PartialOrd)]
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/// enum MyKeychain {
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/// External,
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/// Internal,
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/// MyAppUser {
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/// user_id: u32
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/// }
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/// }
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///
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/// let mut txout_index = KeychainTxOutIndex::<MyKeychain>::default();
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///
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/// # let secp = bdk_chain::bitcoin::secp256k1::Secp256k1::signing_only();
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/// # let (external_descriptor,_) = Descriptor::<DescriptorPublicKey>::parse_descriptor(&secp, "tr([73c5da0a/86'/0'/0']xprv9xgqHN7yz9MwCkxsBPN5qetuNdQSUttZNKw1dcYTV4mkaAFiBVGQziHs3NRSWMkCzvgjEe3n9xV8oYywvM8at9yRqyaZVz6TYYhX98VjsUk/0/*)").unwrap();
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/// # let (internal_descriptor,_) = Descriptor::<DescriptorPublicKey>::parse_descriptor(&secp, "tr([73c5da0a/86'/0'/0']xprv9xgqHN7yz9MwCkxsBPN5qetuNdQSUttZNKw1dcYTV4mkaAFiBVGQziHs3NRSWMkCzvgjEe3n9xV8oYywvM8at9yRqyaZVz6TYYhX98VjsUk/1/*)").unwrap();
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/// # let (descriptor_for_user_42, _) = Descriptor::<DescriptorPublicKey>::parse_descriptor(&secp, "tr([73c5da0a/86'/0'/0']xprv9xgqHN7yz9MwCkxsBPN5qetuNdQSUttZNKw1dcYTV4mkaAFiBVGQziHs3NRSWMkCzvgjEe3n9xV8oYywvM8at9yRqyaZVz6TYYhX98VjsUk/2/*)").unwrap();
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/// txout_index.add_keychain(MyKeychain::External, external_descriptor);
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/// txout_index.add_keychain(MyKeychain::Internal, internal_descriptor);
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/// txout_index.add_keychain(MyKeychain::MyAppUser { user_id: 42 }, descriptor_for_user_42);
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///
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/// let new_spk_for_user = txout_index.reveal_next_spk(&MyKeychain::MyAppUser{ user_id: 42 });
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/// ```
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///
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/// [`Ord`]: core::cmp::Ord
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/// [`SpkTxOutIndex`]: crate::spk_txout_index::SpkTxOutIndex
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/// [`Descriptor`]: crate::miniscript::Descriptor
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/// [`reveal_to_target`]: KeychainTxOutIndex::reveal_to_target
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/// [`reveal_next_spk`]: KeychainTxOutIndex::reveal_next_spk
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/// [`revealed_keychain_spks`]: KeychainTxOutIndex::revealed_keychain_spks
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/// [`revealed_spks`]: KeychainTxOutIndex::revealed_spks
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/// [`index_tx`]: KeychainTxOutIndex::index_tx
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/// [`index_txout`]: KeychainTxOutIndex::index_txout
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/// [`new`]: KeychainTxOutIndex::new
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/// [`unbounded_spk_iter`]: KeychainTxOutIndex::unbounded_spk_iter
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/// [`all_unbounded_spk_iters`]: KeychainTxOutIndex::all_unbounded_spk_iters
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#[derive(Clone, Debug)]
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pub struct KeychainTxOutIndex<K> {
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inner: SpkTxOutIndex<(K, u32)>,
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// descriptors of each keychain
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keychains: BTreeMap<K, Descriptor<DescriptorPublicKey>>,
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// last revealed indexes
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last_revealed: BTreeMap<K, u32>,
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// lookahead settings for each keychain
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lookahead: u32,
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}
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impl<K> Default for KeychainTxOutIndex<K> {
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fn default() -> Self {
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Self::new(DEFAULT_LOOKAHEAD)
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}
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}
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impl<K: Clone + Ord + Debug> Indexer for KeychainTxOutIndex<K> {
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type ChangeSet = super::ChangeSet<K>;
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fn index_txout(&mut self, outpoint: OutPoint, txout: &TxOut) -> Self::ChangeSet {
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match self.inner.scan_txout(outpoint, txout).cloned() {
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Some((keychain, index)) => self.reveal_to_target(&keychain, index).1,
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None => super::ChangeSet::default(),
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}
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}
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fn index_tx(&mut self, tx: &bitcoin::Transaction) -> Self::ChangeSet {
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let mut changeset = super::ChangeSet::<K>::default();
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for (op, txout) in tx.output.iter().enumerate() {
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changeset.append(self.index_txout(OutPoint::new(tx.txid(), op as u32), txout));
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}
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changeset
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}
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fn initial_changeset(&self) -> Self::ChangeSet {
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super::ChangeSet(self.last_revealed.clone())
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}
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fn apply_changeset(&mut self, changeset: Self::ChangeSet) {
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self.apply_changeset(changeset)
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}
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fn is_tx_relevant(&self, tx: &bitcoin::Transaction) -> bool {
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self.inner.is_relevant(tx)
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}
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}
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impl<K> KeychainTxOutIndex<K> {
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/// Construct a [`KeychainTxOutIndex`] with the given `lookahead`.
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///
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/// The `lookahead` is the number of script pubkeys to derive and cache from the internal
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/// descriptors over and above the last revealed script index. Without a lookahead the index
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/// will miss outputs you own when processing transactions whose output script pubkeys lie
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/// beyond the last revealed index. In certain situations, such as when performing an initial
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/// scan of the blockchain during wallet import, it may be uncertain or unknown what the index
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/// of the last revealed script pubkey actually is.
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///
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/// Refer to [struct-level docs](KeychainTxOutIndex) for more about `lookahead`.
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pub fn new(lookahead: u32) -> Self {
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Self {
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inner: SpkTxOutIndex::default(),
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keychains: BTreeMap::new(),
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last_revealed: BTreeMap::new(),
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lookahead,
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}
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}
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}
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/// Methods that are *re-exposed* from the internal [`SpkTxOutIndex`].
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impl<K: Clone + Ord + Debug> KeychainTxOutIndex<K> {
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/// Return a reference to the internal [`SpkTxOutIndex`].
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///
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/// **WARNING:** The internal index will contain lookahead spks. Refer to
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/// [struct-level docs](KeychainTxOutIndex) for more about `lookahead`.
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pub fn inner(&self) -> &SpkTxOutIndex<(K, u32)> {
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&self.inner
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}
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/// Get a reference to the set of indexed outpoints.
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pub fn outpoints(&self) -> &BTreeSet<((K, u32), OutPoint)> {
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self.inner.outpoints()
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}
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/// Return the [`TxOut`] of `outpoint` if it has been indexed.
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///
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/// The associated keychain and keychain index of the txout's spk is also returned.
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///
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/// This calls [`SpkTxOutIndex::txout`] internally.
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pub fn txout(&self, outpoint: OutPoint) -> Option<(K, u32, &TxOut)> {
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self.inner
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.txout(outpoint)
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.map(|((k, i), txo)| (k.clone(), *i, txo))
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}
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/// Return the script that exists under the given `keychain`'s `index`.
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///
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/// This calls [`SpkTxOutIndex::spk_at_index`] internally.
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pub fn spk_at_index(&self, keychain: K, index: u32) -> Option<&Script> {
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self.inner.spk_at_index(&(keychain, index))
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}
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/// Returns the keychain and keychain index associated with the spk.
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///
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/// This calls [`SpkTxOutIndex::index_of_spk`] internally.
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pub fn index_of_spk(&self, script: &Script) -> Option<(K, u32)> {
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self.inner.index_of_spk(script).cloned()
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}
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/// Returns whether the spk under the `keychain`'s `index` has been used.
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///
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/// Here, "unused" means that after the script pubkey was stored in the index, the index has
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/// never scanned a transaction output with it.
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///
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/// This calls [`SpkTxOutIndex::is_used`] internally.
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pub fn is_used(&self, keychain: K, index: u32) -> bool {
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self.inner.is_used(&(keychain, index))
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}
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/// Marks the script pubkey at `index` as used even though the tracker hasn't seen an output
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/// with it.
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///
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/// This only has an effect when the `index` had been added to `self` already and was unused.
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///
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/// Returns whether the `index` was initially present as `unused`.
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///
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/// This is useful when you want to reserve a script pubkey for something but don't want to add
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/// the transaction output using it to the index yet. Other callers will consider `index` on
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/// `keychain` used until you call [`unmark_used`].
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///
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/// This calls [`SpkTxOutIndex::mark_used`] internally.
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///
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/// [`unmark_used`]: Self::unmark_used
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pub fn mark_used(&mut self, keychain: K, index: u32) -> bool {
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self.inner.mark_used(&(keychain, index))
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}
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/// Undoes the effect of [`mark_used`]. Returns whether the `index` is inserted back into
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/// `unused`.
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///
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/// Note that if `self` has scanned an output with this script pubkey, then this will have no
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/// effect.
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///
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/// This calls [`SpkTxOutIndex::unmark_used`] internally.
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///
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/// [`mark_used`]: Self::mark_used
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pub fn unmark_used(&mut self, keychain: K, index: u32) -> bool {
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self.inner.unmark_used(&(keychain, index))
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}
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/// Computes total input value going from script pubkeys in the index (sent) and the total output
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/// value going to script pubkeys in the index (received) in `tx`. For the `sent` to be computed
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/// correctly, the output being spent must have already been scanned by the index. Calculating
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/// received just uses the [`Transaction`] outputs directly, so it will be correct even if it has
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/// not been scanned.
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///
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/// This calls [`SpkTxOutIndex::sent_and_received`] internally.
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pub fn sent_and_received(&self, tx: &Transaction) -> (u64, u64) {
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self.inner.sent_and_received(tx)
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}
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/// Computes the net value that this transaction gives to the script pubkeys in the index and
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/// *takes* from the transaction outputs in the index. Shorthand for calling
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/// [`sent_and_received`] and subtracting sent from received.
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///
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/// This calls [`SpkTxOutIndex::net_value`] internally.
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///
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/// [`sent_and_received`]: Self::sent_and_received
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pub fn net_value(&self, tx: &Transaction) -> i64 {
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self.inner.net_value(tx)
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}
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}
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impl<K: Clone + Ord + Debug> KeychainTxOutIndex<K> {
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/// Return a reference to the internal map of keychain to descriptors.
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pub fn keychains(&self) -> &BTreeMap<K, Descriptor<DescriptorPublicKey>> {
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&self.keychains
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}
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/// Add a keychain to the tracker's `txout_index` with a descriptor to derive addresses.
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///
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/// Adding a keychain means you will be able to derive new script pubkeys under that keychain
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/// and the txout index will discover transaction outputs with those script pubkeys.
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///
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/// # Panics
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///
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/// This will panic if a different `descriptor` is introduced to the same `keychain`.
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pub fn add_keychain(&mut self, keychain: K, descriptor: Descriptor<DescriptorPublicKey>) {
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let old_descriptor = &*self
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.keychains
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.entry(keychain.clone())
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.or_insert_with(|| descriptor.clone());
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assert_eq!(
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&descriptor, old_descriptor,
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"keychain already contains a different descriptor"
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);
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self.replenish_lookahead(&keychain, self.lookahead);
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}
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/// Get the lookahead setting.
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///
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/// Refer to [`new`] for more information on the `lookahead`.
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///
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/// [`new`]: Self::new
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pub fn lookahead(&self) -> u32 {
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self.lookahead
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}
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/// Store lookahead scripts until `target_index`.
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///
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/// This does not change the `lookahead` setting.
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pub fn lookahead_to_target(&mut self, keychain: &K, target_index: u32) {
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let next_index = self.next_store_index(keychain);
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if let Some(temp_lookahead) = target_index.checked_sub(next_index).filter(|&v| v > 0) {
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self.replenish_lookahead(keychain, temp_lookahead);
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}
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}
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fn replenish_lookahead(&mut self, keychain: &K, lookahead: u32) {
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let descriptor = self.keychains.get(keychain).expect("keychain must exist");
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let next_store_index = self.next_store_index(keychain);
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let next_reveal_index = self.last_revealed.get(keychain).map_or(0, |v| *v + 1);
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for (new_index, new_spk) in
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SpkIterator::new_with_range(descriptor, next_store_index..next_reveal_index + lookahead)
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{
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let _inserted = self
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.inner
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.insert_spk((keychain.clone(), new_index), new_spk);
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debug_assert!(_inserted, "replenish lookahead: must not have existing spk: keychain={:?}, lookahead={}, next_store_index={}, next_reveal_index={}", keychain, lookahead, next_store_index, next_reveal_index);
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}
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}
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fn next_store_index(&self, keychain: &K) -> u32 {
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self.inner()
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.all_spks()
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// This range is filtering out the spks with a keychain different than
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// `keychain`. We don't use filter here as range is more optimized.
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.range((keychain.clone(), u32::MIN)..(keychain.clone(), u32::MAX))
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.last()
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.map_or(0, |((_, index), _)| *index + 1)
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}
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/// Get an unbounded spk iterator over a given `keychain`.
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///
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/// # Panics
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///
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/// This will panic if the given `keychain`'s descriptor does not exist.
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pub fn unbounded_spk_iter(&self, keychain: &K) -> SpkIterator<Descriptor<DescriptorPublicKey>> {
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SpkIterator::new(
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self.keychains
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.get(keychain)
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.expect("keychain does not exist")
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.clone(),
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)
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}
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/// Get unbounded spk iterators for all keychains.
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pub fn all_unbounded_spk_iters(
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&self,
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) -> BTreeMap<K, SpkIterator<Descriptor<DescriptorPublicKey>>> {
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self.keychains
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.iter()
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.map(|(k, descriptor)| (k.clone(), SpkIterator::new(descriptor.clone())))
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.collect()
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}
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/// Iterate over revealed spks of all keychains.
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pub fn revealed_spks(&self) -> impl DoubleEndedIterator<Item = (K, u32, &Script)> + Clone {
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self.keychains.keys().flat_map(|keychain| {
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self.revealed_keychain_spks(keychain)
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.map(|(i, spk)| (keychain.clone(), i, spk))
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})
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}
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/// Iterate over revealed spks of the given `keychain`.
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pub fn revealed_keychain_spks(
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&self,
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keychain: &K,
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) -> impl DoubleEndedIterator<Item = (u32, &Script)> + Clone {
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let next_i = self.last_revealed.get(keychain).map_or(0, |&i| i + 1);
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self.inner
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.all_spks()
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.range((keychain.clone(), u32::MIN)..(keychain.clone(), next_i))
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.map(|((_, i), spk)| (*i, spk.as_script()))
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}
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/// Iterate over revealed, but unused, spks of all keychains.
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pub fn unused_spks(&self) -> impl DoubleEndedIterator<Item = (K, u32, &Script)> + Clone {
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self.keychains.keys().flat_map(|keychain| {
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self.unused_keychain_spks(keychain)
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.map(|(i, spk)| (keychain.clone(), i, spk))
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})
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}
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/// Iterate over revealed, but unused, spks of the given `keychain`.
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pub fn unused_keychain_spks(
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&self,
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keychain: &K,
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) -> impl DoubleEndedIterator<Item = (u32, &Script)> + Clone {
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let next_i = self.last_revealed.get(keychain).map_or(0, |&i| i + 1);
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self.inner
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.unused_spks((keychain.clone(), u32::MIN)..(keychain.clone(), next_i))
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.map(|((_, i), spk)| (*i, spk))
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}
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/// Get the next derivation index for `keychain`. The next index is the index after the last revealed
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/// derivation index.
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///
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/// The second field in the returned tuple represents whether the next derivation index is new.
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/// There are two scenarios where the next derivation index is reused (not new):
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///
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/// 1. The keychain's descriptor has no wildcard, and a script has already been revealed.
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/// 2. The number of revealed scripts has already reached 2^31 (refer to BIP-32).
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///
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/// Not checking the second field of the tuple may result in address reuse.
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///
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/// # Panics
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///
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/// Panics if the `keychain` does not exist.
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pub fn next_index(&self, keychain: &K) -> (u32, bool) {
|
|
let descriptor = self.keychains.get(keychain).expect("keychain must exist");
|
|
let last_index = self.last_revealed.get(keychain).cloned();
|
|
|
|
// we can only get the next index if the wildcard exists.
|
|
let has_wildcard = descriptor.has_wildcard();
|
|
|
|
match last_index {
|
|
// if there is no index, next_index is always 0.
|
|
None => (0, true),
|
|
// descriptors without wildcards can only have one index.
|
|
Some(_) if !has_wildcard => (0, false),
|
|
// derivation index must be < 2^31 (BIP-32).
|
|
Some(index) if index > BIP32_MAX_INDEX => {
|
|
unreachable!("index is out of bounds")
|
|
}
|
|
Some(index) if index == BIP32_MAX_INDEX => (index, false),
|
|
// get the next derivation index.
|
|
Some(index) => (index + 1, true),
|
|
}
|
|
}
|
|
|
|
/// Get the last derivation index that is revealed for each keychain.
|
|
///
|
|
/// Keychains with no revealed indices will not be included in the returned [`BTreeMap`].
|
|
pub fn last_revealed_indices(&self) -> &BTreeMap<K, u32> {
|
|
&self.last_revealed
|
|
}
|
|
|
|
/// Get the last derivation index revealed for `keychain`.
|
|
pub fn last_revealed_index(&self, keychain: &K) -> Option<u32> {
|
|
self.last_revealed.get(keychain).cloned()
|
|
}
|
|
|
|
/// Convenience method to call [`Self::reveal_to_target`] on multiple keychains.
|
|
pub fn reveal_to_target_multi(
|
|
&mut self,
|
|
keychains: &BTreeMap<K, u32>,
|
|
) -> (
|
|
BTreeMap<K, SpkIterator<Descriptor<DescriptorPublicKey>>>,
|
|
super::ChangeSet<K>,
|
|
) {
|
|
let mut changeset = super::ChangeSet::default();
|
|
let mut spks = BTreeMap::new();
|
|
|
|
for (keychain, &index) in keychains {
|
|
let (new_spks, new_changeset) = self.reveal_to_target(keychain, index);
|
|
if !new_changeset.is_empty() {
|
|
spks.insert(keychain.clone(), new_spks);
|
|
changeset.append(new_changeset.clone());
|
|
}
|
|
}
|
|
|
|
(spks, changeset)
|
|
}
|
|
|
|
/// Reveals script pubkeys of the `keychain`'s descriptor **up to and including** the
|
|
/// `target_index`.
|
|
///
|
|
/// If the `target_index` cannot be reached (due to the descriptor having no wildcard and/or
|
|
/// the `target_index` is in the hardened index range), this method will make a best-effort and
|
|
/// reveal up to the last possible index.
|
|
///
|
|
/// This returns an iterator of newly revealed indices (alongside their scripts) and a
|
|
/// [`super::ChangeSet`], which reports updates to the latest revealed index. If no new script
|
|
/// pubkeys are revealed, then both of these will be empty.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `keychain` does not exist.
|
|
pub fn reveal_to_target(
|
|
&mut self,
|
|
keychain: &K,
|
|
target_index: u32,
|
|
) -> (
|
|
SpkIterator<Descriptor<DescriptorPublicKey>>,
|
|
super::ChangeSet<K>,
|
|
) {
|
|
let descriptor = self.keychains.get(keychain).expect("keychain must exist");
|
|
let has_wildcard = descriptor.has_wildcard();
|
|
|
|
let target_index = if has_wildcard { target_index } else { 0 };
|
|
let next_reveal_index = self
|
|
.last_revealed
|
|
.get(keychain)
|
|
.map_or(0, |index| *index + 1);
|
|
|
|
debug_assert!(next_reveal_index + self.lookahead >= self.next_store_index(keychain));
|
|
|
|
// If the target_index is already revealed, we are done
|
|
if next_reveal_index > target_index {
|
|
return (
|
|
SpkIterator::new_with_range(
|
|
descriptor.clone(),
|
|
next_reveal_index..next_reveal_index,
|
|
),
|
|
super::ChangeSet::default(),
|
|
);
|
|
}
|
|
|
|
// We range over the indexes that are not stored and insert their spks in the index.
|
|
// Indexes from next_reveal_index to next_reveal_index + lookahead are already stored (due
|
|
// to lookahead), so we only range from next_reveal_index + lookahead to target + lookahead
|
|
let range = next_reveal_index + self.lookahead..=target_index + self.lookahead;
|
|
for (new_index, new_spk) in SpkIterator::new_with_range(descriptor, range) {
|
|
let _inserted = self
|
|
.inner
|
|
.insert_spk((keychain.clone(), new_index), new_spk);
|
|
debug_assert!(_inserted, "must not have existing spk");
|
|
debug_assert!(
|
|
has_wildcard || new_index == 0,
|
|
"non-wildcard descriptors must not iterate past index 0"
|
|
);
|
|
}
|
|
|
|
let _old_index = self.last_revealed.insert(keychain.clone(), target_index);
|
|
debug_assert!(_old_index < Some(target_index));
|
|
(
|
|
SpkIterator::new_with_range(descriptor.clone(), next_reveal_index..target_index + 1),
|
|
super::ChangeSet(core::iter::once((keychain.clone(), target_index)).collect()),
|
|
)
|
|
}
|
|
|
|
/// Attempts to reveal the next script pubkey for `keychain`.
|
|
///
|
|
/// Returns the derivation index of the revealed script pubkey, the revealed script pubkey and a
|
|
/// [`super::ChangeSet`] which represents changes in the last revealed index (if any).
|
|
///
|
|
/// When a new script cannot be revealed, we return the last revealed script and an empty
|
|
/// [`super::ChangeSet`]. There are two scenarios when a new script pubkey cannot be derived:
|
|
///
|
|
/// 1. The descriptor has no wildcard and already has one script revealed.
|
|
/// 2. The descriptor has already revealed scripts up to the numeric bound.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if the `keychain` does not exist.
|
|
pub fn reveal_next_spk(&mut self, keychain: &K) -> ((u32, &Script), super::ChangeSet<K>) {
|
|
let (next_index, _) = self.next_index(keychain);
|
|
let changeset = self.reveal_to_target(keychain, next_index).1;
|
|
let script = self
|
|
.inner
|
|
.spk_at_index(&(keychain.clone(), next_index))
|
|
.expect("script must already be stored");
|
|
((next_index, script), changeset)
|
|
}
|
|
|
|
/// Gets the next unused script pubkey in the keychain. I.e., the script pubkey with the lowest
|
|
/// index that has not been used yet.
|
|
///
|
|
/// This will derive and reveal a new script pubkey if no more unused script pubkeys exist.
|
|
///
|
|
/// If the descriptor has no wildcard and already has a used script pubkey or if a descriptor
|
|
/// has used all scripts up to the derivation bounds, then the last derived script pubkey will be
|
|
/// returned.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `keychain` has never been added to the index
|
|
pub fn next_unused_spk(&mut self, keychain: &K) -> ((u32, &Script), super::ChangeSet<K>) {
|
|
let need_new = self.unused_keychain_spks(keychain).next().is_none();
|
|
// this rather strange branch is needed because of some lifetime issues
|
|
if need_new {
|
|
self.reveal_next_spk(keychain)
|
|
} else {
|
|
(
|
|
self.unused_keychain_spks(keychain)
|
|
.next()
|
|
.expect("we already know next exists"),
|
|
super::ChangeSet::default(),
|
|
)
|
|
}
|
|
}
|
|
|
|
/// Iterates over all the [`OutPoint`] that have a `TxOut` with a script pubkey derived from
|
|
/// `keychain`.
|
|
pub fn keychain_outpoints(
|
|
&self,
|
|
keychain: &K,
|
|
) -> impl DoubleEndedIterator<Item = (u32, OutPoint)> + '_ {
|
|
self.inner
|
|
.outputs_in_range((keychain.clone(), u32::MIN)..(keychain.clone(), u32::MAX))
|
|
.map(|((_, i), op)| (*i, op))
|
|
}
|
|
|
|
/// Returns the highest derivation index of the `keychain` where [`KeychainTxOutIndex`] has
|
|
/// found a [`TxOut`] with it's script pubkey.
|
|
pub fn last_used_index(&self, keychain: &K) -> Option<u32> {
|
|
self.keychain_outpoints(keychain).last().map(|(i, _)| i)
|
|
}
|
|
|
|
/// Returns the highest derivation index of each keychain that [`KeychainTxOutIndex`] has found
|
|
/// a [`TxOut`] with it's script pubkey.
|
|
pub fn last_used_indices(&self) -> BTreeMap<K, u32> {
|
|
self.keychains
|
|
.iter()
|
|
.filter_map(|(keychain, _)| {
|
|
self.last_used_index(keychain)
|
|
.map(|index| (keychain.clone(), index))
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
/// Applies the derivation changeset to the [`KeychainTxOutIndex`], extending the number of
|
|
/// derived scripts per keychain, as specified in the `changeset`.
|
|
pub fn apply_changeset(&mut self, changeset: super::ChangeSet<K>) {
|
|
let _ = self.reveal_to_target_multi(&changeset.0);
|
|
}
|
|
}
|