Handle sending accept_channel when signer is unblocked

Author: alecchendev

lightning/src/ln/channel.rs

@@ -8053,6 +8053,20 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
 
 		Ok((channel, funding_signed, channel_monitor))
 	}
+
+	/// Indicates that the signer may have some signatures for us, so we should retry if we're
+	/// blocked.
+	#[allow(unused)]
+	pub fn signer_maybe_unblocked<L: Deref>(&mut self, logger: &L) -> Option<msgs::AcceptChannel>
+	where L::Target: Logger
+	{
+		if !self.context.holder_commitment_point.is_available() {
+			self.context.holder_commitment_point.advance(&self.context.holder_signer, &self.context.secp_ctx, logger);
+		}
+		if self.signer_pending_accept_channel && self.context.holder_commitment_point.is_available() {
+			self.generate_accept_channel_message(logger)
+		} else { None }
+	}
 }
 
 // A not-yet-funded outbound (from holder) channel using V2 channel establishment.

lightning/src/ln/channelmanager.rs

@@ -8146,9 +8146,17 @@ where
 						});
 					}
 				}
-				ChannelPhase::UnfundedInboundV1(_) => {},
+				ChannelPhase::UnfundedInboundV1(chan) => {
+					let logger = WithChannelContext::from(&self.logger, &chan.context, None);
+					if let Some(msg) = chan.signer_maybe_unblocked(&&logger) {
+						pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
+							node_id,
+							msg,
+						});
+					}
+				},
 			}
-		};
+			};
 
 		let per_peer_state = self.per_peer_state.read().unwrap();
 		if let Some((counterparty_node_id, channel_id)) = channel_opt {