+ /// Returns true if we're ready to commence the closing_signed negotiation phase. This is true
+ /// after both sides have exchanged a `shutdown` message and all HTLCs have been drained. At
+ /// this point if we're the funder we should send the initial closing_signed, and in any case
+ /// shutdown should complete within a reasonable timeframe.
+ fn closing_negotiation_ready(&self) -> bool {
+ self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() &&
+ self.channel_state &
+ (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32 |
+ ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)
+ == BOTH_SIDES_SHUTDOWN_MASK &&
+ self.pending_update_fee.is_none()
+ }
+
+ /// Checks if the closing_signed negotiation is making appropriate progress, possibly returning
+ /// an Err if no progress is being made and the channel should be force-closed instead.
+ /// Should be called on a one-minute timer.
+ pub fn timer_check_closing_negotiation_progress(&mut self) -> Result<(), ChannelError> {
+ if self.closing_negotiation_ready() {
+ if self.closing_signed_in_flight {
+ return Err(ChannelError::Close("closing_signed negotiation failed to finish within two timer ticks".to_owned()));
+ } else {
+ self.closing_signed_in_flight = true;
+ }
+ }
+ Ok(())
+ }
+