X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=src%2Fln%2Fchannelmonitor.rs;h=39146daa9b2d96e6f93f5251c76e0f77353e72fb;hb=3b498378620d4294f188804c97497112e3693297;hp=e467772b1fa1628d4c795547073e944b720245c9;hpb=90b545ffe3e6855e09156361ecb1d5384add1e46;p=rust-lightning diff --git a/src/ln/channelmonitor.rs b/src/ln/channelmonitor.rs index e467772b..39146daa 100644 --- a/src/ln/channelmonitor.rs +++ b/src/ln/channelmonitor.rs @@ -48,6 +48,9 @@ pub enum ChannelMonitorUpdateErr { /// which we have revoked, allowing our counterparty to claim all funds in the channel! pub trait ManyChannelMonitor: Send + Sync { /// Adds or updates a monitor for the given `funding_txo`. + /// Implementor must also ensure that the funding_txo outpoint is registered with any relevant + /// ChainWatchInterfaces such that the provided monitor receives block_connected callbacks with + /// any spends of it. fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr>; } @@ -69,7 +72,12 @@ impl ChainListener for SimpleManyChannelMonit fn block_connected(&self, _header: &BlockHeader, height: u32, txn_matched: &[&Transaction], _indexes_of_txn_matched: &[u32]) { let monitors = self.monitors.lock().unwrap(); for monitor in monitors.values() { - monitor.block_connected(txn_matched, height, &*self.broadcaster); + let txn_outputs = monitor.block_connected(txn_matched, height, &*self.broadcaster); + for (ref txid, ref outputs) in txn_outputs { + for (idx, output) in outputs.iter().enumerate() { + self.chain_monitor.install_watch_outpoint((txid.clone(), idx as u32), &output.script_pubkey); + } + } } } @@ -464,8 +472,9 @@ impl ChannelMonitor { /// optional, without it this monitor cannot be used in an SPV client, but you may wish to /// avoid this (or call unset_funding_info) on a monitor you wish to send to a watchtower as it /// provides slightly better privacy. + /// It's the responsibility of the caller to register outpoint and script with passing the former + /// value as key to add_update_monitor. pub(super) fn set_funding_info(&mut self, funding_info: (OutPoint, Script)) { - //TODO: Need to register the given script here with a chain_monitor self.funding_txo = Some(funding_info); } @@ -908,22 +917,24 @@ impl ChannelMonitor { /// height > height + CLTV_SHARED_CLAIM_BUFFER. In any case, will install monitoring for /// HTLC-Success/HTLC-Timeout transactions, and claim them using the revocation key (if /// applicable) as well. - fn check_spend_remote_transaction(&self, tx: &Transaction, height: u32) -> Vec { + fn check_spend_remote_transaction(&self, tx: &Transaction, height: u32) -> (Vec, (Sha256dHash, Vec)) { // Most secp and related errors trying to create keys means we have no hope of constructing // a spend transaction...so we return no transactions to broadcast let mut txn_to_broadcast = Vec::new(); + let mut watch_outputs = Vec::new(); + + let commitment_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers! + let per_commitment_option = self.remote_claimable_outpoints.get(&commitment_txid); + macro_rules! ignore_error { ( $thing : expr ) => { match $thing { Ok(a) => a, - Err(_) => return txn_to_broadcast + Err(_) => return (txn_to_broadcast, (commitment_txid, watch_outputs)) } }; } - let commitment_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers! - let per_commitment_option = self.remote_claimable_outpoints.get(&commitment_txid); - let commitment_number = 0xffffffffffff - ((((tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (tx.lock_time as u64 & 0xffffff)) ^ self.commitment_transaction_number_obscure_factor); if commitment_number >= self.get_min_seen_secret() { let secret = self.get_secret(commitment_number).unwrap(); @@ -942,7 +953,7 @@ impl ChannelMonitor { }; let delayed_key = ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key), &self.delayed_payment_base_key)); let a_htlc_key = match self.their_htlc_base_key { - None => return txn_to_broadcast, + None => return (txn_to_broadcast, (commitment_txid, watch_outputs)), Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key), &their_htlc_base_key)), }; @@ -1009,7 +1020,7 @@ impl ChannelMonitor { if htlc.transaction_output_index as usize >= tx.output.len() || tx.output[htlc.transaction_output_index as usize].value != htlc.amount_msat / 1000 || tx.output[htlc.transaction_output_index as usize].script_pubkey != expected_script.to_v0_p2wsh() { - return txn_to_broadcast; // Corrupted per_commitment_data, fuck this user + return (txn_to_broadcast, (commitment_txid, watch_outputs)); // Corrupted per_commitment_data, fuck this user } let input = TxIn { previous_output: BitcoinOutPoint { @@ -1044,10 +1055,10 @@ impl ChannelMonitor { if !inputs.is_empty() || !txn_to_broadcast.is_empty() { // ie we're confident this is actually ours // We're definitely a remote commitment transaction! - // TODO: Register all outputs in commitment_tx with the ChainWatchInterface! + watch_outputs.append(&mut tx.output.clone()); self.remote_commitment_txn_on_chain.lock().unwrap().insert(commitment_txid, commitment_number); } - if inputs.is_empty() { return txn_to_broadcast; } // Nothing to be done...probably a false positive/local tx + if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs)); } // Nothing to be done...probably a false positive/local tx let outputs = vec!(TxOut { script_pubkey: self.destination_script.clone(), @@ -1077,7 +1088,7 @@ impl ChannelMonitor { // already processed the block, resulting in the remote_commitment_txn_on_chain entry // not being generated by the above conditional. Thus, to be safe, we go ahead and // insert it here. - // TODO: Register all outputs in commitment_tx with the ChainWatchInterface! + watch_outputs.append(&mut tx.output.clone()); self.remote_commitment_txn_on_chain.lock().unwrap().insert(commitment_txid, commitment_number); if let Some(revocation_points) = self.their_cur_revocation_points { @@ -1098,7 +1109,7 @@ impl ChannelMonitor { }, }; let a_htlc_key = match self.their_htlc_base_key { - None => return txn_to_broadcast, + None => return (txn_to_broadcast, (commitment_txid, watch_outputs)), Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &their_htlc_base_key)), }; @@ -1161,7 +1172,7 @@ impl ChannelMonitor { } } - if inputs.is_empty() { return txn_to_broadcast; } // Nothing to be done...probably a false positive/local tx + if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs)); } // Nothing to be done...probably a false positive/local tx let outputs = vec!(TxOut { script_pubkey: self.destination_script.clone(), @@ -1189,7 +1200,7 @@ impl ChannelMonitor { //TODO: For each input check if its in our remote_commitment_txn_on_chain map! } - txn_to_broadcast + (txn_to_broadcast, (commitment_txid, watch_outputs)) } fn broadcast_by_local_state(&self, local_tx: &LocalSignedTx) -> Vec { @@ -1250,11 +1261,15 @@ impl ChannelMonitor { Vec::new() } - fn block_connected(&self, txn_matched: &[&Transaction], height: u32, broadcaster: &BroadcasterInterface) { + fn block_connected(&self, txn_matched: &[&Transaction], height: u32, broadcaster: &BroadcasterInterface)-> Vec<(Sha256dHash, Vec)> { + let mut watch_outputs = Vec::new(); for tx in txn_matched { for txin in tx.input.iter() { if self.funding_txo.is_none() || (txin.previous_output.txid == self.funding_txo.as_ref().unwrap().0.txid && txin.previous_output.vout == self.funding_txo.as_ref().unwrap().0.index as u32) { - let mut txn = self.check_spend_remote_transaction(tx, height); + let (mut txn, new_outputs) = self.check_spend_remote_transaction(tx, height); + if !new_outputs.1.is_empty() { + watch_outputs.push(new_outputs); + } if txn.is_empty() { txn = self.check_spend_local_transaction(tx, height); } @@ -1281,6 +1296,7 @@ impl ChannelMonitor { } } } + watch_outputs } pub fn would_broadcast_at_height(&self, height: u32) -> bool {