panic on invalid calls to Channel::send_commitment instead of Err

diff --git a/src/ln/channel.rs b/src/ln/channel.rs
index 77bd70143da75c37f7f8e38fe1a95fe0d710e8a9..d9633ea836284277c8c54fd6b7ab34dcea25850c 100644 (file)
--- a/src/ln/channel.rs
+++ b/src/ln/channel.rs
@@ -2390,12 +2390,13 @@ impl Channel {
        /// Creates a signed commitment transaction to send to the remote peer.
        /// Always returns a Channel-failing HandleError::action if an immediately-preceding (read: the
        /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
+       /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
        pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
                if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
-                       return Err(HandleError{err: "Cannot create commitment tx until channel is fully established", action: None});
+                       panic!("Cannot create commitment tx until channel is fully established");
                }
                if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
-                       return Err(HandleError{err: "Cannot create commitment tx until remote revokes their previous commitment", action: None});
+                       panic!("Cannot create commitment tx until remote revokes their previous commitment");
                }
                let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
                for htlc in self.pending_htlcs.iter() {
@@ -2405,7 +2406,7 @@ impl Channel {
                        if have_updates { break; }
                }
                if !have_updates {
-                       return Err(HandleError{err: "Cannot create commitment tx until we have some updates to send", action: None});
+                       panic!("Cannot create commitment tx until we have some updates to send");
                }
                self.send_commitment_no_status_check()
        }