Add timer_chan_freshness_every_min

Latency/peer disconnection may trigger us to mark as disabled
some of our channels. After some time, if channels are still
disabled we need to broadcast ChannelUpdate to inform other network
peers about the uselessness of these channels.

Author: Antoine Riard

lightning/src/ln/channelmanager.rs

@@ -1487,6 +1487,28 @@ impl<'a> ChannelManager<'a> {
 		events.append(&mut new_events);
 	}
 
+	/// Latency/peer disconnection may trigger us to mark as disabled some
+	/// of our channels. After some time, if channels are still disabled
+	/// we need to broadcast ChannelUpdate to inform other network peers
+	/// about the uselessness of this channels.
+	pub fn timer_chan_freshness_every_min(&self) {
+		let _ = self.total_consistency_lock.read().unwrap();
+		{
+			let mut channel_state_lock = self.channel_state.lock().unwrap();
+			let channel_state = channel_state_lock.borrow_parts();
+			for (_, chan) in channel_state.by_id {
+				// Check if channel is still disabled
+				if !chan.is_live() {
+					if let Ok(update) = self.get_channel_update(&chan) {
+						channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+							msg: update
+						});
+					}
+				}
+			}
+		}
+	}
+
 	/// Indicates that the preimage for payment_hash is unknown or the received amount is incorrect
 	/// after a PaymentReceived event, failing the HTLC back to its origin and freeing resources
 	/// along the path (including in our own channel on which we received it).
@@ -2795,7 +2817,6 @@ impl<'a> ChannelMessageHandler for ChannelManager<'a> {
 				log_debug!(self, "Marking channels with {} disconnected and generating channel_updates", log_pubkey!(their_node_id));
 				channel_state.by_id.retain(|_, chan| {
 					if chan.get_their_node_id() == *their_node_id {
-						//TODO: mark channel disabled (and maybe announce such after a timeout).
 						let failed_adds = chan.remove_uncommitted_htlcs_and_mark_paused();
 						if !failed_adds.is_empty() {
 							let chan_update = self.get_channel_update(&chan).map(|u| u.encode_with_len()).unwrap(); // Cannot add/recv HTLCs before we have a short_id so unwrap is safe