lnrpc+rpcserver: add missing channel update event type

Fixes the error "unexpected channel event update" in
SubscribeChannelEvents.

lnrpc/lightning.proto

@@ -2973,6 +2973,7 @@ message ChannelEventUpdate {
         ChannelPoint inactive_channel = 4;
         PendingUpdate pending_open_channel = 6;
         ChannelPoint fully_resolved_channel = 7;
+        ChannelPoint channel_funding_timeout = 8;
     }
 
     enum UpdateType {
@@ -2982,6 +2983,7 @@ message ChannelEventUpdate {
         INACTIVE_CHANNEL = 3;
         PENDING_OPEN_CHANNEL = 4;
         FULLY_RESOLVED_CHANNEL = 5;
+        CHANNEL_FUNDING_TIMEOUT = 6;
     }
 
     UpdateType type = 5;

lnrpc/lightning.swagger.json

@@ -3009,7 +3009,8 @@
         "ACTIVE_CHANNEL",
         "INACTIVE_CHANNEL",
         "PENDING_OPEN_CHANNEL",
-        "FULLY_RESOLVED_CHANNEL"
+        "FULLY_RESOLVED_CHANNEL",
+        "CHANNEL_FUNDING_TIMEOUT"
       ],
       "default": "OPEN_CHANNEL"
     },
@@ -4480,6 +4481,9 @@
         "fully_resolved_channel": {
           "$ref": "#/definitions/lnrpcChannelPoint"
         },
+        "channel_funding_timeout": {
+          "$ref": "#/definitions/lnrpcChannelPoint"
+        },
         "type": {
           "$ref": "#/definitions/ChannelEventUpdateUpdateType"
         }

rpcserver.go

@@ -5315,6 +5315,7 @@ func (r *rpcServer) SubscribeChannelEvents(req *lnrpc.ChannelEventSubscription,
 	defer channelEventSub.Cancel()
 
 	for {
+		//nolint:ll
 		select {
 		// A new update has been sent by the channel router, we'll
 		// marshal it into the form expected by the gRPC client, then
@@ -5410,6 +5411,19 @@ func (r *rpcServer) SubscribeChannelEvents(req *lnrpc.ChannelEventSubscription,
 					},
 				}
 
+			case channelnotifier.FundingTimeoutEvent:
+				update = &lnrpc.ChannelEventUpdate{
+					Type: lnrpc.ChannelEventUpdate_CHANNEL_FUNDING_TIMEOUT,
+					Channel: &lnrpc.ChannelEventUpdate_ChannelFundingTimeout{
+						ChannelFundingTimeout: &lnrpc.ChannelPoint{
+							FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{
+								FundingTxidBytes: event.ChannelPoint.Hash[:],
+							},
+							OutputIndex: event.ChannelPoint.Index,
+						},
+					},
+				}
+
 			default:
 				return fmt.Errorf("unexpected channel event update: %v", event)
 			}