// construct one themselves.
use ln::{PaymentHash, PaymentPreimage, PaymentSecret};
pub use ln::channel::CounterpartyForwardingInfo;
-use ln::channel::{Channel, ChannelError, ChannelUpdateStatus};
+use ln::channel::{Channel, ChannelError, ChannelUpdateStatus, UpdateFulfillCommitFetch};
use ln::features::{InitFeatures, NodeFeatures};
use routing::router::{Route, RouteHop};
use ln::msgs;
use util::{byte_utils, events};
use util::ser::{Readable, ReadableArgs, MaybeReadable, Writeable, Writer};
use util::chacha20::{ChaCha20, ChaChaReader};
-use util::logger::Logger;
+use util::logger::{Logger, Level};
use util::errors::APIError;
use prelude::*;
}
}
+/// Return value for claim_funds_from_hop
+enum ClaimFundsFromHop {
+ PrevHopForceClosed,
+ MonitorUpdateFail(PublicKey, MsgHandleErrInternal, Option<u64>),
+ Success(u64),
+ DuplicateClaim,
+}
+
type ShutdownResult = (Option<(OutPoint, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>);
/// Error type returned across the channel_state mutex boundary. When an Err is generated for a
// OUR PAYMENT!
// final_expiry_too_soon
- // We have to have some headroom to broadcast on chain if we have the preimage, so make sure we have at least
- // HTLC_FAIL_BACK_BUFFER blocks to go.
- // Also, ensure that, in the case of an unknown payment hash, our payment logic has enough time to fail the HTLC backward
- // before our onchain logic triggers a channel closure (see HTLC_FAIL_BACK_BUFFER rational).
+ // We have to have some headroom to broadcast on chain if we have the preimage, so make sure
+ // we have at least HTLC_FAIL_BACK_BUFFER blocks to go.
+ // Also, ensure that, in the case of an unknown preimage for the received payment hash, our
+ // payment logic has enough time to fail the HTLC backward before our onchain logic triggers a
+ // channel closure (see HTLC_FAIL_BACK_BUFFER rationale).
if (msg.cltv_expiry as u64) <= self.best_block.read().unwrap().height() as u64 + HTLC_FAIL_BACK_BUFFER as u64 + 1 {
return_err!("The final CLTV expiry is too soon to handle", 17, &[0;0]);
}
HTLCFailReason::Reason { failure_code: 0x4000|15, data: htlc_msat_height_data });
} else {
match self.claim_funds_from_hop(channel_state.as_mut().unwrap(), htlc.prev_hop, payment_preimage) {
- Err(Some(e)) => {
- if let msgs::ErrorAction::IgnoreError = e.1.err.action {
+ ClaimFundsFromHop::MonitorUpdateFail(pk, err, _) => {
+ if let msgs::ErrorAction::IgnoreError = err.err.action {
// We got a temporary failure updating monitor, but will claim the
// HTLC when the monitor updating is restored (or on chain).
- log_error!(self.logger, "Temporary failure claiming HTLC, treating as success: {}", e.1.err.err);
+ log_error!(self.logger, "Temporary failure claiming HTLC, treating as success: {}", err.err.err);
claimed_any_htlcs = true;
- } else { errs.push(e); }
+ } else { errs.push((pk, err)); }
+ },
+ ClaimFundsFromHop::PrevHopForceClosed => unreachable!("We already checked for channel existence, we can't fail here!"),
+ ClaimFundsFromHop::DuplicateClaim => {
+ // While we should never get here in most cases, if we do, it likely
+ // indicates that the HTLC was timed out some time ago and is no longer
+ // available to be claimed. Thus, it does not make sense to set
+ // `claimed_any_htlcs`.
},
- Err(None) => unreachable!("We already checked for channel existence, we can't fail here!"),
- Ok(()) => claimed_any_htlcs = true,
+ ClaimFundsFromHop::Success(_) => claimed_any_htlcs = true,
}
}
}
} else { false }
}
- fn claim_funds_from_hop(&self, channel_state_lock: &mut MutexGuard<ChannelHolder<Signer>>, prev_hop: HTLCPreviousHopData, payment_preimage: PaymentPreimage) -> Result<(), Option<(PublicKey, MsgHandleErrInternal)>> {
+ fn claim_funds_from_hop(&self, channel_state_lock: &mut MutexGuard<ChannelHolder<Signer>>, prev_hop: HTLCPreviousHopData, payment_preimage: PaymentPreimage) -> ClaimFundsFromHop {
//TODO: Delay the claimed_funds relaying just like we do outbound relay!
let channel_state = &mut **channel_state_lock;
let chan_id = match channel_state.short_to_id.get(&prev_hop.short_channel_id) {
Some(chan_id) => chan_id.clone(),
None => {
- return Err(None)
+ return ClaimFundsFromHop::PrevHopForceClosed
}
};
if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(chan_id) {
- let was_frozen_for_monitor = chan.get().is_awaiting_monitor_update();
match chan.get_mut().get_update_fulfill_htlc_and_commit(prev_hop.htlc_id, payment_preimage, &self.logger) {
- Ok((msgs, monitor_option)) => {
- if let Some(monitor_update) = monitor_option {
+ Ok(msgs_monitor_option) => {
+ if let UpdateFulfillCommitFetch::NewClaim { msgs, htlc_value_msat, monitor_update } = msgs_monitor_option {
if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
- if was_frozen_for_monitor {
- assert!(msgs.is_none());
- } else {
- return Err(Some((chan.get().get_counterparty_node_id(), handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()).unwrap_err())));
- }
+ log_given_level!(self.logger, if e == ChannelMonitorUpdateErr::PermanentFailure { Level::Error } else { Level::Debug },
+ "Failed to update channel monitor with preimage {:?}: {:?}",
+ payment_preimage, e);
+ return ClaimFundsFromHop::MonitorUpdateFail(
+ chan.get().get_counterparty_node_id(),
+ handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()).unwrap_err(),
+ Some(htlc_value_msat)
+ );
}
+ if let Some((msg, commitment_signed)) = msgs {
+ log_debug!(self.logger, "Claiming funds for HTLC with preimage {} resulted in a commitment_signed for channel {}",
+ log_bytes!(payment_preimage.0), log_bytes!(chan.get().channel_id()));
+ channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+ node_id: chan.get().get_counterparty_node_id(),
+ updates: msgs::CommitmentUpdate {
+ update_add_htlcs: Vec::new(),
+ update_fulfill_htlcs: vec![msg],
+ update_fail_htlcs: Vec::new(),
+ update_fail_malformed_htlcs: Vec::new(),
+ update_fee: None,
+ commitment_signed,
+ }
+ });
+ }
+ return ClaimFundsFromHop::Success(htlc_value_msat);
+ } else {
+ return ClaimFundsFromHop::DuplicateClaim;
}
- if let Some((msg, commitment_signed)) = msgs {
- log_debug!(self.logger, "Claiming funds for HTLC with preimage {} resulted in a commitment_signed for channel {}",
- log_bytes!(payment_preimage.0), log_bytes!(chan.get().channel_id()));
- channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
- node_id: chan.get().get_counterparty_node_id(),
- updates: msgs::CommitmentUpdate {
- update_add_htlcs: Vec::new(),
- update_fulfill_htlcs: vec![msg],
- update_fail_htlcs: Vec::new(),
- update_fail_malformed_htlcs: Vec::new(),
- update_fee: None,
- commitment_signed,
- }
- });
- }
- return Ok(())
},
- Err(e) => {
- // TODO: Do something with e?
- // This should only occur if we are claiming an HTLC at the same time as the
- // HTLC is being failed (eg because a block is being connected and this caused
- // an HTLC to time out). This should, of course, only occur if the user is the
- // one doing the claiming (as it being a part of a peer claim would imply we're
- // about to lose funds) and only if the lock in claim_funds was dropped as a
- // previous HTLC was failed (thus not for an MPP payment).
- debug_assert!(false, "This shouldn't be reachable except in absurdly rare cases between monitor updates and HTLC timeouts: {:?}", e);
- return Err(None)
+ Err((e, monitor_update)) => {
+ if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
+ log_given_level!(self.logger, if e == ChannelMonitorUpdateErr::PermanentFailure { Level::Error } else { Level::Info },
+ "Failed to update channel monitor with preimage {:?} immediately prior to force-close: {:?}",
+ payment_preimage, e);
+ }
+ let counterparty_node_id = chan.get().get_counterparty_node_id();
+ let (drop, res) = convert_chan_err!(self, e, channel_state.short_to_id, chan.get_mut(), &chan_id);
+ if drop {
+ chan.remove_entry();
+ }
+ return ClaimFundsFromHop::MonitorUpdateFail(counterparty_node_id, res, None);
},
}
} else { unreachable!(); }
}
- fn claim_funds_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<Signer>>, source: HTLCSource, payment_preimage: PaymentPreimage) {
+ fn claim_funds_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<Signer>>, source: HTLCSource, payment_preimage: PaymentPreimage, forwarded_htlc_value_msat: Option<u64>, from_onchain: bool) {
match source {
HTLCSource::OutboundRoute { session_priv, .. } => {
mem::drop(channel_state_lock);
},
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) => {
- 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),
- } {
- mem::drop(channel_state_lock);
- let res: Result<(), _> = Err(err);
- let _ = handle_error!(self, res, counterparty_node_id);
+ let res = self.claim_funds_from_hop(&mut channel_state_lock, hop_data, payment_preimage);
+ let claimed_htlc = if let ClaimFundsFromHop::DuplicateClaim = res { false } else { true };
+ let htlc_claim_value_msat = match res {
+ ClaimFundsFromHop::MonitorUpdateFail(_, _, amt_opt) => amt_opt,
+ ClaimFundsFromHop::Success(amt) => Some(amt),
+ _ => None,
+ };
+ if let ClaimFundsFromHop::PrevHopForceClosed = res {
+ 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);
+ }
+ // Note that we do *not* set `claimed_htlc` to false here. In fact, this
+ // totally could be a duplicate claim, but we have no way of knowing
+ // without interrogating the `ChannelMonitor` we've provided the above
+ // update to. Instead, we simply document in `PaymentForwarded` that this
+ // can happen.
+ }
+ mem::drop(channel_state_lock);
+ if let ClaimFundsFromHop::MonitorUpdateFail(pk, err, _) = res {
+ let result: Result<(), _> = Err(err);
+ let _ = handle_error!(self, result, pk);
+ }
+
+ if claimed_htlc {
+ if let Some(forwarded_htlc_value) = forwarded_htlc_value_msat {
+ let fee_earned_msat = if let Some(claimed_htlc_value) = htlc_claim_value_msat {
+ Some(claimed_htlc_value - forwarded_htlc_value)
+ } else { None };
+
+ let mut pending_events = self.pending_events.lock().unwrap();
+ pending_events.push(events::Event::PaymentForwarded {
+ fee_earned_msat,
+ claim_from_onchain_tx: from_onchain,
+ });
+ }
}
},
}
fn internal_update_fulfill_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
let mut channel_lock = self.channel_state.lock().unwrap();
- let htlc_source = {
+ let (htlc_source, forwarded_htlc_value) = {
let channel_state = &mut *channel_lock;
match channel_state.by_id.entry(msg.channel_id) {
hash_map::Entry::Occupied(mut chan) => {
hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
}
};
- self.claim_funds_internal(channel_lock, htlc_source, msg.payment_preimage.clone());
+ self.claim_funds_internal(channel_lock, htlc_source, msg.payment_preimage.clone(), Some(forwarded_htlc_value), false);
Ok(())
}
/// Process pending events from the `chain::Watch`, returning whether any events were processed.
fn process_pending_monitor_events(&self) -> bool {
let mut failed_channels = Vec::new();
- let pending_monitor_events = self.chain_monitor.release_pending_monitor_events();
+ let mut pending_monitor_events = self.chain_monitor.release_pending_monitor_events();
let has_pending_monitor_events = !pending_monitor_events.is_empty();
- for monitor_event in pending_monitor_events {
+ for monitor_event in pending_monitor_events.drain(..) {
match monitor_event {
MonitorEvent::HTLCEvent(htlc_update) => {
if let Some(preimage) = htlc_update.payment_preimage {
log_trace!(self.logger, "Claiming HTLC with preimage {} from our monitor", log_bytes!(preimage.0));
- self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
+ self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage, htlc_update.onchain_value_satoshis.map(|v| v * 1000), true);
} else {
log_trace!(self.logger, "Failing HTLC with hash {} from our monitor", log_bytes!(htlc_update.payment_hash.0));
self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
projects / rust-lightning / blobdiff