+ /// Check whether any channels have finished removing all pending updates after a shutdown
+ /// exchange and can now send a closing_signed.
+ /// Returns whether any closing_signed messages were generated.
+ fn maybe_generate_initial_closing_signed(&self) -> bool {
+ let mut handle_errors: Vec<(PublicKey, Result<(), _>)> = Vec::new();
+ let mut has_update = false;
+ {
+ let mut channel_state_lock = self.channel_state.lock().unwrap();
+ let channel_state = &mut *channel_state_lock;
+ let by_id = &mut channel_state.by_id;
+ let short_to_id = &mut channel_state.short_to_id;
+ let pending_msg_events = &mut channel_state.pending_msg_events;
+
+ by_id.retain(|channel_id, chan| {
+ match chan.maybe_propose_closing_signed(&self.fee_estimator, &self.logger) {
+ Ok((msg_opt, tx_opt)) => {
+ if let Some(msg) = msg_opt {
+ has_update = true;
+ pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
+ node_id: chan.get_counterparty_node_id(), msg,
+ });
+ }
+ if let Some(tx) = tx_opt {
+ // We're done with this channel. We got a closing_signed and sent back
+ // a closing_signed with a closing transaction to broadcast.
+ if let Some(short_id) = chan.get_short_channel_id() {
+ short_to_id.remove(&short_id);
+ }
+
+ if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
+ pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+ msg: update
+ });
+ }
+
+ log_info!(self.logger, "Broadcasting {}", log_tx!(tx));
+ self.tx_broadcaster.broadcast_transaction(&tx);
+ false
+ } else { true }
+ },
+ Err(e) => {
+ has_update = true;
+ let (close_channel, res) = convert_chan_err!(self, e, short_to_id, chan, channel_id);
+ handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
+ !close_channel
+ }
+ }
+ });
+ }
+
+ for (counterparty_node_id, err) in handle_errors.drain(..) {
+ let _ = handle_error!(self, err, counterparty_node_id);
+ }
+
+ has_update
+ }
+