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WIP: testing lightningdevkit/rust-lightning#2337
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| use std::collections::{HashMap, VecDeque}; | ||
| use std::ops::Deref; | ||
| use std::sync::Mutex; | ||
|
|
||
| use bitcoin::blockdata::transaction::Transaction; | ||
| use bitcoin::hash_types::{BlockHash, Txid}; | ||
|
|
||
| use lightning::chain; | ||
| use lightning::chain::chaininterface::FEERATE_FLOOR_SATS_PER_KW; | ||
| use lightning::chain::chainmonitor::{self, MonitorUpdateId}; | ||
| use lightning::chain::channelmonitor::{self, ChannelMonitor, RevokeableOutputData}; | ||
| use lightning::chain::transaction::OutPoint; | ||
| use lightning::sign::{self, EntropySource, SignerProvider}; | ||
| use lightning::util::persist::KVStorePersister; | ||
| use lightning::util::ser::Writeable; | ||
| use lightning_persister::FilesystemPersister; | ||
|
|
||
| // number_of_witness_elements + sig_length + revocation_sig + true_length + op_true + witness_script_length + witness_script | ||
| pub(crate) const WEIGHT_REVOKED_OUTPUT: u64 = 1 + 1 + 73 + 1 + 1 + 1 + 77; | ||
|
|
||
| pub(crate) struct WatchtowerPersister { | ||
| persister: FilesystemPersister, | ||
| /// Upon a new commitment signed, we'll get a | ||
| /// ChannelMonitorUpdateStep::LatestCounterpartyCommitmentTxInfo. We'll store the commitment txid | ||
| /// and revokeable output index and value to use to form the justice tx once we get a | ||
| /// revoke_and_ack with the commitment secret. | ||
| revokeable_output_data: Mutex<HashMap<OutPoint, VecDeque<RevokeableOutputData>>>, | ||
| /// After receiving a revoke_and_ack for a commitment number, we'll form and store the justice | ||
| /// tx which would be used to provide a watchtower with the data it needs. | ||
| watchtower_state: Mutex<HashMap<OutPoint, HashMap<Txid, Transaction>>>, | ||
| } | ||
|
|
||
| impl WatchtowerPersister { | ||
| pub(crate) fn new(path_to_channel_data: String) -> Self { | ||
| WatchtowerPersister { | ||
| persister: FilesystemPersister::new(path_to_channel_data), | ||
| revokeable_output_data: Mutex::new(HashMap::new()), | ||
| watchtower_state: Mutex::new(HashMap::new()), | ||
| } | ||
| } | ||
|
|
||
| pub(crate) fn justice_tx( | ||
| &self, funding_txo: OutPoint, commitment_txid: &Txid, | ||
| ) -> Option<Transaction> { | ||
| self.watchtower_state | ||
| .lock() | ||
| .unwrap() | ||
| .get(&funding_txo) | ||
| .unwrap() | ||
| .get(commitment_txid) | ||
| .cloned() | ||
| } | ||
|
|
||
| pub fn persist<W: Writeable>(&self, key: &str, object: &W) -> std::io::Result<()> { | ||
| println!("SDS: Persisting"); | ||
| self.persister.persist(key, object) | ||
| } | ||
|
|
||
| pub fn read_channelmonitors<ES: Deref, SP: Deref>( | ||
| &self, entropy_source: ES, signer_provider: SP, | ||
| ) -> std::io::Result<Vec<(BlockHash, ChannelMonitor<<SP::Target as SignerProvider>::Signer>)>> | ||
| where | ||
| ES::Target: EntropySource + Sized, | ||
| SP::Target: SignerProvider + Sized, | ||
| { | ||
| self.persister.read_channelmonitors(entropy_source, signer_provider) | ||
| } | ||
| } | ||
|
|
||
| impl<Signer: sign::WriteableEcdsaChannelSigner> chainmonitor::Persist<Signer> | ||
| for WatchtowerPersister | ||
| { | ||
| fn persist_new_channel( | ||
| &self, funding_txo: OutPoint, data: &channelmonitor::ChannelMonitor<Signer>, | ||
| id: MonitorUpdateId, | ||
| ) -> chain::ChannelMonitorUpdateStatus { | ||
| assert!(self | ||
| .revokeable_output_data | ||
| .lock() | ||
| .unwrap() | ||
| .insert(funding_txo, VecDeque::new()) | ||
| .is_none()); | ||
| assert!(self | ||
| .watchtower_state | ||
| .lock() | ||
| .unwrap() | ||
| .insert(funding_txo, HashMap::new()) | ||
| .is_none()); | ||
| println!("Initial commitment"); | ||
| self.persister.persist_new_channel(funding_txo, data, id) | ||
| // TODO: accomodate for first channel update | ||
| } | ||
|
|
||
| fn update_persisted_channel( | ||
| &self, funding_txo: OutPoint, update: Option<&channelmonitor::ChannelMonitorUpdate>, | ||
| data: &channelmonitor::ChannelMonitor<Signer>, update_id: MonitorUpdateId, | ||
| ) -> chain::ChannelMonitorUpdateStatus { | ||
| if let Some(update) = update { | ||
| // Track new counterparty commitment txs | ||
| let revokeable_output_data = data.revokeable_output_data_from_update(update); | ||
| let mut channels_revokeable_output_data = self.revokeable_output_data.lock().unwrap(); | ||
| let channel_state = channels_revokeable_output_data.get_mut(&funding_txo).unwrap(); | ||
| channel_state.extend(revokeable_output_data.into_iter()); | ||
|
|
||
| // Form justice txs for revoked counterparty commitment txs | ||
| while let Some(RevokeableOutputData { | ||
| commitment_number, | ||
| commitment_txid, | ||
| output_idx, | ||
| value, | ||
| }) = channel_state.front() | ||
| { | ||
| let mut justice_tx = | ||
| data.build_justice_tx(*commitment_txid, *output_idx as u32, *value); | ||
|
|
||
| // Fee estimation | ||
| let weight = justice_tx.weight() as u64 + WEIGHT_REVOKED_OUTPUT; | ||
| let min_feerate_per_kw = FEERATE_FLOOR_SATS_PER_KW; | ||
| let fee = min_feerate_per_kw as u64 * weight / 1000; | ||
| justice_tx.output[0].value -= fee; | ||
|
|
||
| // Sign justice tx | ||
| let input_idx = 0; | ||
| match data.sign_justice_tx(justice_tx, input_idx, *value, *commitment_number) { | ||
| Ok(signed_justice_tx) => { | ||
| println!( | ||
| "Channel updated ({}). commitment_txid: {}, penalty: {:?}", | ||
| commitment_number, commitment_txid, signed_justice_tx | ||
| ); | ||
| let dup = self | ||
| .watchtower_state | ||
| .lock() | ||
| .unwrap() | ||
| .get_mut(&funding_txo) | ||
| .unwrap() | ||
| .insert(*commitment_txid, signed_justice_tx); | ||
| assert!(dup.is_none()); | ||
| channel_state.pop_front(); | ||
| } | ||
| Err(_) => break, | ||
| } | ||
| } | ||
| } | ||
| self.persister.update_persisted_channel(funding_txo, update, data, update_id) | ||
| } | ||
| } | ||
|
|
||
| // impl KVStorePersister for WatchtowerPersister { | ||
| // fn persist<W: Writeable>(&self, key: &str, object: &W) -> std::io::Result<()> { | ||
| // self.persister.persist(key, object) | ||
| // } | ||
| // } |