Remove dual_funding cfg attributes

We'll only gate public API related to contributing toward an inbound or opening
a dual funded channel.

Author: dunxen

Cargo.toml

@@ -63,7 +63,6 @@ check-cfg = [
     "cfg(taproot)",
     "cfg(async_signing)",
     "cfg(require_route_graph_test)",
-    "cfg(dual_funding)",
     "cfg(splicing)",
     "cfg(async_payments)",
 ]

ci/ci-tests.sh

@@ -166,8 +166,6 @@ RUSTFLAGS="--cfg=taproot" cargo test --verbose --color always -p lightning
 [ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
 RUSTFLAGS="--cfg=async_signing" cargo test --verbose --color always -p lightning
 [ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
-RUSTFLAGS="--cfg=dual_funding" cargo test --verbose --color always -p lightning
-[ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
 RUSTFLAGS="--cfg=splicing" cargo test --verbose --color always -p lightning
 [ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
 RUSTFLAGS="--cfg=async_payments" cargo test --verbose --color always -p lightning

lightning/src/ln/channel.rs

@@ -1121,9 +1121,7 @@ impl_writeable_tlv_based!(PendingChannelMonitorUpdate, {
 pub(super) enum ChannelPhase<SP: Deref> where SP::Target: SignerProvider {
 	UnfundedOutboundV1(OutboundV1Channel<SP>),
 	UnfundedInboundV1(InboundV1Channel<SP>),
-	#[cfg(any(dual_funding, splicing))]
 	UnfundedOutboundV2(OutboundV2Channel<SP>),
-	#[cfg(any(dual_funding, splicing))]
 	UnfundedInboundV2(InboundV2Channel<SP>),
 	Funded(Channel<SP>),
 }
@@ -1137,9 +1135,7 @@ impl<'a, SP: Deref> ChannelPhase<SP> where
 			ChannelPhase::Funded(chan) => &chan.context,
 			ChannelPhase::UnfundedOutboundV1(chan) => &chan.context,
 			ChannelPhase::UnfundedInboundV1(chan) => &chan.context,
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedOutboundV2(chan) => &chan.context,
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedInboundV2(chan) => &chan.context,
 		}
 	}
@@ -1149,9 +1145,7 @@ impl<'a, SP: Deref> ChannelPhase<SP> where
 			ChannelPhase::Funded(ref mut chan) => &mut chan.context,
 			ChannelPhase::UnfundedOutboundV1(ref mut chan) => &mut chan.context,
 			ChannelPhase::UnfundedInboundV1(ref mut chan) => &mut chan.context,
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedOutboundV2(ref mut chan) => &mut chan.context,
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedInboundV2(ref mut chan) => &mut chan.context,
 		}
 	}
@@ -3822,15 +3816,13 @@ pub(crate) fn get_legacy_default_holder_selected_channel_reserve_satoshis(channe
 ///
 /// This is used both for outbound and inbound channels and has lower bound
 /// of `dust_limit_satoshis`.
-#[cfg(any(dual_funding, splicing))]
 fn get_v2_channel_reserve_satoshis(channel_value_satoshis: u64, dust_limit_satoshis: u64) -> u64 {
 	// Fixed at 1% of channel value by spec.
 	let (q, _) = channel_value_satoshis.overflowing_div(100);
 	cmp::min(channel_value_satoshis, cmp::max(q, dust_limit_satoshis))
 }
 
 /// Context for dual-funded channels.
-#[cfg(any(dual_funding, splicing))]
 pub(super) struct DualFundingChannelContext {
 	/// The amount in satoshis we will be contributing to the channel.
 	pub our_funding_satoshis: u64,
@@ -3847,7 +3839,6 @@ pub(super) struct DualFundingChannelContext {
 // Counterparty designates channel data owned by the another channel participant entity.
 pub(super) struct Channel<SP: Deref> where SP::Target: SignerProvider {
 	pub context: ChannelContext<SP>,
-	#[cfg(any(dual_funding, splicing))]
 	pub dual_funding_channel_context: Option<DualFundingChannelContext>,
 }
 
@@ -8032,7 +8023,6 @@ impl<SP: Deref> OutboundV1Channel<SP> where SP::Target: SignerProvider {
 
 		let mut channel = Channel {
 			context: self.context,
-			#[cfg(any(dual_funding, splicing))]
 			dual_funding_channel_context: None,
 		};
 
@@ -8262,7 +8252,6 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
 		// `ChannelMonitor`.
 		let mut channel = Channel {
 			context: self.context,
-			#[cfg(any(dual_funding, splicing))]
 			dual_funding_channel_context: None,
 		};
 		let need_channel_ready = channel.check_get_channel_ready(0, logger).is_some();
@@ -8273,15 +8262,12 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
 }
 
 // A not-yet-funded outbound (from holder) channel using V2 channel establishment.
-#[cfg(any(dual_funding, splicing))]
 pub(super) struct OutboundV2Channel<SP: Deref> where SP::Target: SignerProvider {
 	pub context: ChannelContext<SP>,
 	pub unfunded_context: UnfundedChannelContext,
-	#[cfg(any(dual_funding, splicing))]
 	pub dual_funding_context: DualFundingChannelContext,
 }
 
-#[cfg(any(dual_funding, splicing))]
 impl<SP: Deref> OutboundV2Channel<SP> where SP::Target: SignerProvider {
 	pub fn new<ES: Deref, F: Deref, L: Deref>(
 		fee_estimator: &LowerBoundedFeeEstimator<F>, entropy_source: &ES, signer_provider: &SP,
@@ -8401,14 +8387,12 @@ impl<SP: Deref> OutboundV2Channel<SP> where SP::Target: SignerProvider {
 }
 
 // A not-yet-funded inbound (from counterparty) channel using V2 channel establishment.
-#[cfg(any(dual_funding, splicing))]
 pub(super) struct InboundV2Channel<SP: Deref> where SP::Target: SignerProvider {
 	pub context: ChannelContext<SP>,
 	pub unfunded_context: UnfundedChannelContext,
 	pub dual_funding_context: DualFundingChannelContext,
 }
 
-#[cfg(any(dual_funding, splicing))]
 impl<SP: Deref> InboundV2Channel<SP> where SP::Target: SignerProvider {
 	/// Creates a new dual-funded channel from a remote side's request for one.
 	/// Assumes chain_hash has already been checked and corresponds with what we expect!
@@ -9619,7 +9603,6 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 				blocked_monitor_updates: blocked_monitor_updates.unwrap(),
 				is_manual_broadcast: is_manual_broadcast.unwrap_or(false),
 			},
-			#[cfg(any(dual_funding, splicing))]
 			dual_funding_channel_context: None,
 		})
 	}

lightning/src/ln/channelmanager.rs

@@ -1336,9 +1336,7 @@ impl <SP: Deref> PeerState<SP> where SP::Target: SignerProvider {
 			match phase {
 				ChannelPhase::Funded(_) | ChannelPhase::UnfundedOutboundV1(_) => true,
 				ChannelPhase::UnfundedInboundV1(_) => false,
-				#[cfg(any(dual_funding, splicing))]
 				ChannelPhase::UnfundedOutboundV2(_) => true,
-				#[cfg(any(dual_funding, splicing))]
 				ChannelPhase::UnfundedInboundV2(_) => false,
 			}
 		)
@@ -3009,11 +3007,9 @@ macro_rules! convert_chan_phase_err {
 			ChannelPhase::UnfundedInboundV1(channel) => {
 				convert_chan_phase_err!($self, $peer_state, $err, channel, $channel_id, UNFUNDED_CHANNEL)
 			},
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedOutboundV2(channel) => {
 				convert_chan_phase_err!($self, $peer_state, $err, channel, $channel_id, UNFUNDED_CHANNEL)
 			},
-			#[cfg(any(dual_funding, splicing))]
 			ChannelPhase::UnfundedInboundV2(channel) => {
 				convert_chan_phase_err!($self, $peer_state, $err, channel, $channel_id, UNFUNDED_CHANNEL)
 			},
@@ -3997,13 +3993,7 @@ where
 						self.finish_close_channel(chan.context.force_shutdown(broadcast, closure_reason));
 						(self.get_channel_update_for_broadcast(&chan).ok(), chan.context.get_counterparty_node_id())
 					},
-					ChannelPhase::UnfundedOutboundV1(_) | ChannelPhase::UnfundedInboundV1(_) => {
-						self.finish_close_channel(chan_phase.context_mut().force_shutdown(false, closure_reason));
-						// Unfunded channel has no update
-						(None, chan_phase.context().get_counterparty_node_id())
-					},
-					// TODO(dual_funding): Combine this match arm with above once #[cfg(any(dual_funding, splicing))] is removed.
-					#[cfg(any(dual_funding, splicing))]
+					ChannelPhase::UnfundedOutboundV1(_) | ChannelPhase::UnfundedInboundV1(_) |
 					ChannelPhase::UnfundedOutboundV2(_) | ChannelPhase::UnfundedInboundV2(_) => {
 						self.finish_close_channel(chan_phase.context_mut().force_shutdown(false, closure_reason));
 						// Unfunded channel has no update
@@ -6482,11 +6472,9 @@ where
 							ChannelPhase::UnfundedOutboundV1(chan) => {
 								process_unfunded_channel_tick!(peer_state, chan, pending_msg_events)
 							},
-							#[cfg(any(dual_funding, splicing))]
 							ChannelPhase::UnfundedInboundV2(chan) => {
 								process_unfunded_channel_tick!(peer_state, chan, pending_msg_events)
 							},
-							#[cfg(any(dual_funding, splicing))]
 							ChannelPhase::UnfundedOutboundV2(chan) => {
 								process_unfunded_channel_tick!(peer_state, chan, pending_msg_events)
 							},
@@ -7772,8 +7760,6 @@ where
 						num_unfunded_channels += 1;
 					}
 				},
-				// TODO(dual_funding): Combine this match arm with above once #[cfg(any(dual_funding, splicing))] is removed.
-				#[cfg(any(dual_funding, splicing))]
 				ChannelPhase::UnfundedInboundV2(chan) => {
 					// Only inbound V2 channels that are not 0conf and that we do not contribute to will be
 					// included in the unfunded count.
@@ -7782,16 +7768,10 @@ where
 						num_unfunded_channels += 1;
 					}
 				},
-				ChannelPhase::UnfundedOutboundV1(_) => {
+				ChannelPhase::UnfundedOutboundV1(_) | ChannelPhase::UnfundedOutboundV2(_) => {
 					// Outbound channels don't contribute to the unfunded count in the DoS context.
 					continue;
 				},
-				// TODO(dual_funding): Combine this match arm with above once #[cfg(any(dual_funding, splicing))] is removed.
-				#[cfg(any(dual_funding, splicing))]
-				ChannelPhase::UnfundedOutboundV2(_) => {
-					// Outbound channels don't contribute to the unfunded count in the DoS context.
-					continue;
-				}
 			}
 		}
 		num_unfunded_channels + peer.inbound_channel_request_by_id.len()
@@ -8210,17 +8190,8 @@ where
 								peer_state_lock, peer_state, per_peer_state, chan);
 						}
 					},
-					ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::UnfundedOutboundV1(_) => {
-						let context = phase.context_mut();
-						let logger = WithChannelContext::from(&self.logger, context, None);
-						log_error!(logger, "Immediately closing unfunded channel {} as peer asked to cooperatively shut it down (which is unnecessary)", &msg.channel_id);
-						let mut chan = remove_channel_phase!(self, peer_state, chan_phase_entry);
-						finish_shutdown = Some(chan.context_mut().force_shutdown(false, ClosureReason::CounterpartyCoopClosedUnfundedChannel));
-					},
-					// TODO(dual_funding): Combine this match arm with above.
-					#[cfg(any(dual_funding, splicing))]
+					ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::UnfundedOutboundV1(_) |
 					ChannelPhase::UnfundedInboundV2(_) | ChannelPhase::UnfundedOutboundV2(_) => {
-						let context = phase.context_mut();
 						log_error!(self.logger, "Immediately closing unfunded channel {} as peer asked to cooperatively shut it down (which is unnecessary)", &msg.channel_id);
 						let mut chan = remove_channel_phase!(self, peer_state, chan_phase_entry);
 						finish_shutdown = Some(chan.context_mut().force_shutdown(false, ClosureReason::CounterpartyCoopClosedUnfundedChannel));
@@ -9145,7 +9116,7 @@ where
 					}
 					None
 				}
-				ChannelPhase::UnfundedInboundV1(_) => None,
+				ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::UnfundedInboundV2(_) | ChannelPhase::UnfundedOutboundV2(_) => None,
 			}
 		};
 
@@ -10601,9 +10572,7 @@ where
 				peer_state.channel_by_id.retain(|_, phase| {
 					match phase {
 						// Retain unfunded channels.
-						ChannelPhase::UnfundedOutboundV1(_) | ChannelPhase::UnfundedInboundV1(_) => true,
-						// TODO(dual_funding): Combine this match arm with above.
-						#[cfg(any(dual_funding, splicing))]
+						ChannelPhase::UnfundedOutboundV1(_) | ChannelPhase::UnfundedInboundV1(_) |
 						ChannelPhase::UnfundedOutboundV2(_) | ChannelPhase::UnfundedInboundV2(_) => true,
 						ChannelPhase::Funded(channel) => {
 							let res = f(channel);
@@ -11111,11 +11080,9 @@ where
 						ChannelPhase::UnfundedInboundV1(chan) => {
 							&mut chan.context
 						},
-						#[cfg(any(dual_funding, splicing))]
 						ChannelPhase::UnfundedOutboundV2(chan) => {
 							&mut chan.context
 						},
-						#[cfg(any(dual_funding, splicing))]
 						ChannelPhase::UnfundedInboundV2(chan) => {
 							&mut chan.context
 						},
@@ -11277,30 +11244,19 @@ where
 							});
 						}
 
-						// TODO(dual_funding): Combine this match arm with above once #[cfg(any(dual_funding, splicing))] is removed.
-						#[cfg(any(dual_funding, splicing))]
 						ChannelPhase::UnfundedOutboundV2(chan) => {
 							pending_msg_events.push(events::MessageSendEvent::SendOpenChannelV2 {
 								node_id: chan.context.get_counterparty_node_id(),
 								msg: chan.get_open_channel_v2(self.chain_hash),
 							});
 						},
 
-						ChannelPhase::UnfundedInboundV1(_) => {
+						ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::UnfundedInboundV2(_) => {
 							// Since unfunded inbound channel maps are cleared upon disconnecting a peer,
 							// they are not persisted and won't be recovered after a crash.
 							// Therefore, they shouldn't exist at this point.
 							debug_assert!(false);
 						}
-
-						// TODO(dual_funding): Combine this match arm with above once #[cfg(any(dual_funding, splicing))] is removed.
-						#[cfg(any(dual_funding, splicing))]
-						ChannelPhase::UnfundedInboundV2(channel) => {
-							// Since unfunded inbound channel maps are cleared upon disconnecting a peer,
-							// they are not persisted and won't be recovered after a crash.
-							// Therefore, they shouldn't exist at this point.
-							debug_assert!(false);
-						},
 					}
 				}
 			}
@@ -11397,7 +11353,6 @@ where
 							return;
 						}
 					},
-					#[cfg(any(dual_funding, splicing))]
 					Some(ChannelPhase::UnfundedOutboundV2(ref mut chan)) => {
 						if let Ok(msg) = chan.maybe_handle_error_without_close(self.chain_hash, &self.fee_estimator) {
 							peer_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannelV2 {
@@ -11407,9 +11362,7 @@ where
 							return;
 						}
 					},
-					None | Some(ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::Funded(_)) => (),
-					#[cfg(any(dual_funding, splicing))]
-					Some(ChannelPhase::UnfundedInboundV2(_)) => (),
+					None | Some(ChannelPhase::UnfundedInboundV1(_) | ChannelPhase::UnfundedInboundV2(_) | ChannelPhase::Funded(_)) => (),
 				}
 			}
 

lightning/src/ln/mod.rs

@@ -88,7 +88,6 @@ mod async_signer_tests;
 #[cfg(test)]
 #[allow(unused_mut)]
 mod offers_tests;
-#[allow(dead_code)] // TODO(dual_funding): Exchange for dual_funding cfg
 pub(crate) mod interactivetxs;
 
 pub use self::peer_channel_encryptor::LN_MAX_MSG_LEN;