//! It does not manage routing logic (see routing::router::get_route for that) nor does it manage constructing
//! on-chain transactions (it only monitors the chain to watch for any force-closes that might
//! imply it needs to fail HTLCs/payments/channels it manages).
+//!
use bitcoin::blockdata::block::BlockHeader;
use bitcoin::blockdata::constants::genesis_block;
use chain;
use chain::Watch;
use chain::chaininterface::{BroadcasterInterface, FeeEstimator};
-use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr, HTLC_FAIL_BACK_BUFFER, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY, MonitorEvent};
+use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, ChannelMonitorUpdateErr, HTLC_FAIL_BACK_BUFFER, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY, MonitorEvent, CLOSED_CHANNEL_UPDATE_ID};
use chain::transaction::{OutPoint, TransactionData};
use ln::channel::{Channel, ChannelError};
use ln::features::{InitFeatures, NodeFeatures};
pub(super) enum HTLCForwardInfo {
AddHTLC {
+ forward_info: PendingHTLCInfo,
+
+ // These fields are produced in `forward_htlcs()` and consumed in
+ // `process_pending_htlc_forwards()` for constructing the
+ // `HTLCSource::PreviousHopData` for failed and forwarded
+ // HTLCs.
prev_short_channel_id: u64,
prev_htlc_id: u64,
- forward_info: PendingHTLCInfo,
+ prev_funding_outpoint: OutPoint,
},
FailHTLC {
htlc_id: u64,
short_channel_id: u64,
htlc_id: u64,
incoming_packet_shared_secret: [u8; 32],
+
+ // This field is consumed by `claim_funds_from_hop()` when updating a force-closed backwards
+ // channel with a preimage provided by the forward channel.
+ outpoint: OutPoint,
}
struct ClaimableHTLC {
last_block_hash: Mutex<BlockHash>,
secp_ctx: Secp256k1<secp256k1::All>,
- #[cfg(test)]
+ #[cfg(any(test, feature = "_test_utils"))]
pub(super) channel_state: Mutex<ChannelHolder<ChanSigner>>,
- #[cfg(not(test))]
+ #[cfg(not(any(test, feature = "_test_utils")))]
channel_state: Mutex<ChannelHolder<ChanSigner>>,
our_network_key: SecretKey,
PendingHTLCStatus::Forward(PendingHTLCInfo {
routing: PendingHTLCRouting::Forward {
onion_packet: outgoing_packet,
- short_channel_id: short_channel_id,
+ short_channel_id,
},
payment_hash: msg.payment_hash.clone(),
incoming_shared_secret: shared_secret,
let unsigned = msgs::UnsignedChannelUpdate {
chain_hash: self.genesis_hash,
- short_channel_id: short_channel_id,
+ short_channel_id,
timestamp: chan.get_update_time_counter(),
flags: (!were_node_one) as u8 | ((!chan.is_live() as u8) << 1),
cltv_expiry_delta: CLTV_EXPIRY_DELTA,
let mut channel_state = self.channel_state.lock().unwrap();
channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
node_id: chan.get_counterparty_node_id(),
- msg: msg,
+ msg,
});
match channel_state.by_id.entry(chan.channel_id()) {
hash_map::Entry::Occupied(_) => {
failed_forwards.reserve(pending_forwards.len());
for forward_info in pending_forwards.drain(..) {
match forward_info {
- HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info } => {
+ HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info,
+ prev_funding_outpoint } => {
let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
short_channel_id: prev_short_channel_id,
+ outpoint: prev_funding_outpoint,
htlc_id: prev_htlc_id,
incoming_packet_shared_secret: forward_info.incoming_shared_secret,
});
HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info: PendingHTLCInfo {
routing: PendingHTLCRouting::Forward {
onion_packet, ..
- }, incoming_shared_secret, payment_hash, amt_to_forward, outgoing_cltv_value }, } => {
+ }, incoming_shared_secret, payment_hash, amt_to_forward, outgoing_cltv_value },
+ prev_funding_outpoint } => {
log_trace!(self.logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", log_bytes!(payment_hash.0), prev_short_channel_id, short_chan_id);
let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
short_channel_id: prev_short_channel_id,
+ outpoint: prev_funding_outpoint,
htlc_id: prev_htlc_id,
incoming_packet_shared_secret: incoming_shared_secret,
});
match forward_info {
HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info: PendingHTLCInfo {
routing: PendingHTLCRouting::Receive { payment_data, incoming_cltv_expiry },
- incoming_shared_secret, payment_hash, amt_to_forward, .. }, } => {
+ incoming_shared_secret, payment_hash, amt_to_forward, .. },
+ prev_funding_outpoint } => {
let prev_hop = HTLCPreviousHopData {
short_channel_id: prev_short_channel_id,
+ outpoint: prev_funding_outpoint,
htlc_id: prev_htlc_id,
incoming_packet_shared_secret: incoming_shared_secret,
};
);
failed_forwards.push((HTLCSource::PreviousHopData(HTLCPreviousHopData {
short_channel_id: htlc.prev_hop.short_channel_id,
+ outpoint: prev_funding_outpoint,
htlc_id: htlc.prev_hop.htlc_id,
incoming_packet_shared_secret: htlc.prev_hop.incoming_packet_shared_secret,
}), payment_hash,
}
} else if total_value == data.total_msat {
new_events.push(events::Event::PaymentReceived {
- payment_hash: payment_hash,
+ payment_hash,
payment_secret: Some(data.payment_secret),
amt: total_value,
});
}
} else {
new_events.push(events::Event::PaymentReceived {
- payment_hash: payment_hash,
+ payment_hash,
payment_secret: None,
amt: amt_to_forward,
});
}
}
},
- HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret }) => {
+ HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret, .. }) => {
let err_packet = match onion_error {
HTLCFailReason::Reason { failure_code, data } => {
log_trace!(self.logger, "Failing HTLC with payment_hash {} backwards from us with code {}", log_bytes!(payment_hash.0), failure_code);
});
},
HTLCSource::PreviousHopData(hop_data) => {
+ let prev_outpoint = hop_data.outpoint;
if let Err((counterparty_node_id, err)) = match self.claim_funds_from_hop(&mut channel_state_lock, hop_data, payment_preimage) {
Ok(()) => Ok(()),
Err(None) => {
- // TODO: There is probably a channel monitor somewhere that needs to
- // learn the preimage as the channel already hit the chain and that's
- // why it's missing.
+ let preimage_update = ChannelMonitorUpdate {
+ update_id: CLOSED_CHANNEL_UPDATE_ID,
+ updates: vec![ChannelMonitorUpdateStep::PaymentPreimage {
+ payment_preimage: payment_preimage.clone(),
+ }],
+ };
+ // We update the ChannelMonitor on the backward link, after
+ // receiving an offchain preimage event from the forward link (the
+ // event being update_fulfill_htlc).
+ if let Err(e) = self.chain_monitor.update_channel(prev_outpoint, preimage_update) {
+ log_error!(self.logger, "Critical error: failed to update channel monitor with preimage {:?}: {:?}",
+ payment_preimage, e);
+ }
Ok(())
},
Err(Some(res)) => Err(res),
let (raa, commitment_update, order, pending_forwards, mut pending_failures, needs_broadcast_safe, funding_locked) = channel.monitor_updating_restored(&self.logger);
if !pending_forwards.is_empty() {
- htlc_forwards.push((channel.get_short_channel_id().expect("We can't have pending forwards before funding confirmation"), pending_forwards));
+ htlc_forwards.push((channel.get_short_channel_id().expect("We can't have pending forwards before funding confirmation"), funding_txo.clone(), pending_forwards));
}
htlc_failures.append(&mut pending_failures);
pending_events.push(events::Event::FundingGenerationReady {
temporary_channel_id: msg.temporary_channel_id,
channel_value_satoshis: value,
- output_script: output_script,
+ output_script,
user_channel_id: user_id,
});
Ok(())
};
let mut pending_events = self.pending_events.lock().unwrap();
pending_events.push(events::Event::FundingBroadcastSafe {
- funding_txo: funding_txo,
+ funding_txo,
user_channel_id: user_id,
});
Ok(())
}
#[inline]
- fn forward_htlcs(&self, per_source_pending_forwards: &mut [(u64, Vec<(PendingHTLCInfo, u64)>)]) {
- for &mut (prev_short_channel_id, ref mut pending_forwards) in per_source_pending_forwards {
+ fn forward_htlcs(&self, per_source_pending_forwards: &mut [(u64, OutPoint, Vec<(PendingHTLCInfo, u64)>)]) {
+ for &mut (prev_short_channel_id, prev_funding_outpoint, ref mut pending_forwards) in per_source_pending_forwards {
let mut forward_event = None;
if !pending_forwards.is_empty() {
let mut channel_state = self.channel_state.lock().unwrap();
PendingHTLCRouting::Receive { .. } => 0,
}) {
hash_map::Entry::Occupied(mut entry) => {
- entry.get_mut().push(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info });
+ entry.get_mut().push(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_funding_outpoint,
+ prev_htlc_id, forward_info });
},
hash_map::Entry::Vacant(entry) => {
- entry.insert(vec!(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info }));
+ entry.insert(vec!(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_funding_outpoint,
+ prev_htlc_id, forward_info }));
}
}
}
msg,
});
}
- break Ok((pending_forwards, pending_failures, chan.get().get_short_channel_id().expect("RAA should only work on a short-id-available channel")))
+ break Ok((pending_forwards, pending_failures, chan.get().get_short_channel_id().expect("RAA should only work on a short-id-available channel"), chan.get().get_funding_txo().unwrap()))
},
hash_map::Entry::Vacant(_) => break Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
}
};
self.fail_holding_cell_htlcs(htlcs_to_fail, msg.channel_id);
match res {
- Ok((pending_forwards, mut pending_failures, short_channel_id)) => {
+ Ok((pending_forwards, mut pending_failures, short_channel_id, channel_outpoint)) => {
for failure in pending_failures.drain(..) {
self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
}
- self.forward_htlcs(&mut [(short_channel_id, pending_forwards)]);
+ self.forward_htlcs(&mut [(short_channel_id, channel_outpoint, pending_forwards)]);
Ok(())
},
Err(e) => Err(e)
impl_writeable!(HTLCPreviousHopData, 0, {
short_channel_id,
+ outpoint,
htlc_id,
incoming_packet_shared_secret
});
impl Writeable for HTLCForwardInfo {
fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
match self {
- &HTLCForwardInfo::AddHTLC { ref prev_short_channel_id, ref prev_htlc_id, ref forward_info } => {
+ &HTLCForwardInfo::AddHTLC { ref prev_short_channel_id, ref prev_funding_outpoint, ref prev_htlc_id, ref forward_info } => {
0u8.write(writer)?;
prev_short_channel_id.write(writer)?;
+ prev_funding_outpoint.write(writer)?;
prev_htlc_id.write(writer)?;
forward_info.write(writer)?;
},
match <u8 as Readable>::read(reader)? {
0 => Ok(HTLCForwardInfo::AddHTLC {
prev_short_channel_id: Readable::read(reader)?,
+ prev_funding_outpoint: Readable::read(reader)?,
prev_htlc_id: Readable::read(reader)?,
forward_info: Readable::read(reader)?,
}),
/// This may result in closing some Channels if the ChannelMonitor is newer than the stored
/// ChannelManager state to ensure no loss of funds. Thus, transactions may be broadcasted.
/// 3) Register all relevant ChannelMonitor outpoints with your chain watch mechanism using
-/// ChannelMonitor::get_monitored_outpoints and ChannelMonitor::get_funding_txo().
+/// ChannelMonitor::get_outputs_to_watch() and ChannelMonitor::get_funding_txo().
/// 4) Reconnect blocks on your ChannelMonitors.
/// 5) Move the ChannelMonitors into your local chain::Watch.
/// 6) Disconnect/connect blocks on the ChannelManager.