// You may not use this file except in accordance with one or both of these
// licenses.
-//! Utitilies for bumping transactions originating from [`super::Event`]s.
+//! Utilities for bumping transactions originating from [`Event`]s.
+//!
+//! [`Event`]: crate::events::Event
use core::convert::TryInto;
use core::ops::Deref;
use crate::chain::chaininterface::BroadcasterInterface;
use crate::chain::ClaimId;
-use crate::sign::{ChannelSigner, EcdsaChannelSigner, SignerProvider};
use crate::io_extras::sink;
-use crate::ln::PaymentPreimage;
use crate::ln::chan_utils;
use crate::ln::chan_utils::{
ANCHOR_INPUT_WITNESS_WEIGHT, HTLC_SUCCESS_INPUT_ANCHOR_WITNESS_WEIGHT,
HTLC_TIMEOUT_INPUT_ANCHOR_WITNESS_WEIGHT, ChannelTransactionParameters, HTLCOutputInCommitment
};
-use crate::events::Event;
-use crate::prelude::HashMap;
+use crate::ln::features::ChannelTypeFeatures;
+use crate::ln::PaymentPreimage;
+use crate::prelude::*;
+use crate::sign::{ChannelSigner, EcdsaChannelSigner, SignerProvider};
use crate::sync::Mutex;
use crate::util::logger::Logger;
use bitcoin::secp256k1;
use bitcoin::secp256k1::{PublicKey, Secp256k1};
use bitcoin::secp256k1::ecdsa::Signature;
-use crate::ln::features::ChannelTypeFeatures;
const EMPTY_SCRIPT_SIG_WEIGHT: u64 = 1 /* empty script_sig */ * WITNESS_SCALE_FACTOR as u64;
pub commitment_txid: Txid,
/// The number of the commitment transaction in which the HTLC output lives.
pub per_commitment_number: u64,
+ /// The key tweak corresponding to the number of the commitment transaction in which the HTLC
+ /// output lives. This tweak is applied to all the basepoints for both parties in the channel to
+ /// arrive at unique keys per commitment.
+ ///
+ /// See <https://github.com/lightning/bolts/blob/master/03-transactions.md#keys> for more info.
+ pub per_commitment_point: PublicKey,
/// The details of the HTLC as it appears in the commitment transaction.
pub htlc: HTLCOutputInCommitment,
/// The preimage, if `Some`, to claim the HTLC output with. If `None`, the timeout path must be
/// Returns the delayed output created as a result of spending the HTLC output in the commitment
/// transaction.
- pub fn tx_output<C: secp256k1::Signing + secp256k1::Verification>(
- &self, per_commitment_point: &PublicKey, secp: &Secp256k1<C>
- ) -> TxOut {
+ pub fn tx_output<C: secp256k1::Signing + secp256k1::Verification>(&self, secp: &Secp256k1<C>) -> TxOut {
let channel_params = self.channel_parameters.as_holder_broadcastable();
let broadcaster_keys = channel_params.broadcaster_pubkeys();
let counterparty_keys = channel_params.countersignatory_pubkeys();
let broadcaster_delayed_key = chan_utils::derive_public_key(
- secp, per_commitment_point, &broadcaster_keys.delayed_payment_basepoint
+ secp, &self.per_commitment_point, &broadcaster_keys.delayed_payment_basepoint
);
let counterparty_revocation_key = chan_utils::derive_public_revocation_key(
- secp, per_commitment_point, &counterparty_keys.revocation_basepoint
+ secp, &self.per_commitment_point, &counterparty_keys.revocation_basepoint
);
chan_utils::build_htlc_output(
0 /* feerate_per_kw */, channel_params.contest_delay(), &self.htlc,
}
/// Returns the witness script of the HTLC output in the commitment transaction.
- pub fn witness_script<C: secp256k1::Signing + secp256k1::Verification>(
- &self, per_commitment_point: &PublicKey, secp: &Secp256k1<C>
- ) -> Script {
+ pub fn witness_script<C: secp256k1::Signing + secp256k1::Verification>(&self, secp: &Secp256k1<C>) -> Script {
let channel_params = self.channel_parameters.as_holder_broadcastable();
let broadcaster_keys = channel_params.broadcaster_pubkeys();
let counterparty_keys = channel_params.countersignatory_pubkeys();
let broadcaster_htlc_key = chan_utils::derive_public_key(
- secp, per_commitment_point, &broadcaster_keys.htlc_basepoint
+ secp, &self.per_commitment_point, &broadcaster_keys.htlc_basepoint
);
let counterparty_htlc_key = chan_utils::derive_public_key(
- secp, per_commitment_point, &counterparty_keys.htlc_basepoint
+ secp, &self.per_commitment_point, &counterparty_keys.htlc_basepoint
);
let counterparty_revocation_key = chan_utils::derive_public_revocation_key(
- secp, per_commitment_point, &counterparty_keys.revocation_basepoint
+ secp, &self.per_commitment_point, &counterparty_keys.revocation_basepoint
);
chan_utils::get_htlc_redeemscript_with_explicit_keys(
&self.htlc, &ChannelTypeFeatures::anchors_zero_htlc_fee_and_dependencies(), &broadcaster_htlc_key, &counterparty_htlc_key,
pub struct CoinSelection {
/// The set of UTXOs (with at least 1 confirmation) to spend and use within a transaction
/// requiring additional fees.
- confirmed_utxos: Vec<Utxo>,
+ pub confirmed_utxos: Vec<Utxo>,
/// An additional output tracking whether any change remained after coin selection. This output
/// should always have a value above dust for its given `script_pubkey`. It should not be
/// spent until the transaction it belongs to confirms to ensure mempool descendant limits are
/// not met. This implies no other party should be able to spend it except us.
- change_output: Option<TxOut>,
+ pub change_output: Option<TxOut>,
}
/// An abstraction over a bitcoin wallet that can perform coin selection over a set of UTXOs and can
/// A handler for [`Event::BumpTransaction`] events that sources confirmed UTXOs from a
/// [`CoinSelectionSource`] to fee bump transactions via Child-Pays-For-Parent (CPFP) or
/// Replace-By-Fee (RBF).
+///
+/// [`Event::BumpTransaction`]: crate::events::Event::BumpTransaction
pub struct BumpTransactionEventHandler<B: Deref, C: Deref, SP: Deref, L: Deref>
where
B::Target: BroadcasterInterface,
L::Target: Logger,
{
/// Returns a new instance capable of handling [`Event::BumpTransaction`] events.
+ ///
+ /// [`Event::BumpTransaction`]: crate::events::Event::BumpTransaction
pub fn new(broadcaster: B, utxo_source: C, signer_provider: SP, logger: L) -> Self {
Self {
broadcaster,
let mut signers = HashMap::new();
let mut must_spend = Vec::with_capacity(htlc_descriptors.len());
for htlc_descriptor in htlc_descriptors {
- let signer = signers.entry(htlc_descriptor.channel_keys_id)
+ signers.entry(htlc_descriptor.channel_keys_id)
.or_insert_with(||
self.signer_provider.derive_channel_signer(
htlc_descriptor.channel_value_satoshis, htlc_descriptor.channel_keys_id,
)
);
- let per_commitment_point = signer.get_per_commitment_point(
- htlc_descriptor.per_commitment_number, &self.secp
- );
let htlc_input = htlc_descriptor.unsigned_tx_input();
must_spend.push(Input {
},
});
tx.input.push(htlc_input);
- let htlc_output = htlc_descriptor.tx_output(&per_commitment_point, &self.secp);
+ let htlc_output = htlc_descriptor.tx_output(&self.secp);
tx.output.push(htlc_output);
}
let htlc_sig = signer.sign_holder_htlc_transaction(
&htlc_tx, idx, htlc_descriptor, &self.secp
)?;
- let per_commitment_point = signer.get_per_commitment_point(
- htlc_descriptor.per_commitment_number, &self.secp
- );
- let witness_script = htlc_descriptor.witness_script(&per_commitment_point, &self.secp);
+ let witness_script = htlc_descriptor.witness_script(&self.secp);
htlc_tx.input[idx].witness = htlc_descriptor.tx_input_witness(&htlc_sig, &witness_script);
}
Ok(())
}
- /// Handles all variants of [`BumpTransactionEvent`], immediately returning otherwise.
- pub fn handle_event(&self, event: &Event) {
- let event = if let Event::BumpTransaction(event) = event {
- event
- } else {
- return;
- };
+ /// Handles all variants of [`BumpTransactionEvent`].
+ pub fn handle_event(&self, event: &BumpTransactionEvent) {
match event {
BumpTransactionEvent::ChannelClose {
claim_id, package_target_feerate_sat_per_1000_weight, commitment_tx,
projects / rust-lightning / blobdiff