- pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, [u8; 32])>), HandleError> {
+ fn maybe_propose_first_closing_signed(&mut self, fee_estimator: &FeeEstimator) -> Option<msgs::ClosingSigned> {
+ if !self.channel_outbound || !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() ||
+ self.channel_state & (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32) != BOTH_SIDES_SHUTDOWN_MASK ||
+ self.last_sent_closing_fee.is_some() || self.pending_update_fee.is_some() {
+ return None;
+ }
+
+ let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
+ if self.feerate_per_kw > proposed_feerate {
+ proposed_feerate = self.feerate_per_kw;
+ }
+ let tx_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
+ let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
+
+ let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
+ let funding_redeemscript = self.get_funding_redeemscript();
+ let sighash = hash_to_message!(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]);
+
+ self.last_sent_closing_fee = Some((proposed_feerate, total_fee_satoshis));
+ Some(msgs::ClosingSigned {
+ channel_id: self.channel_id,
+ fee_satoshis: total_fee_satoshis,
+ signature: self.secp_ctx.sign(&sighash, &self.local_keys.funding_key),
+ })
+ }
+
+ pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, PaymentHash)>), ChannelError> {