lnrpc: add commit fees to WaitingPendingClose

lnrpc/rpc.proto

@@ -2028,6 +2028,24 @@ message PendingChannelsResponse {
 
         /// Hash of the remote pending version of the commitment tx.
         string remote_pending_txid = 3;
+
+        /*
+        The amount in satoshis calculated to be paid in fees for the local
+        commitment.
+        */
+        uint64 local_commit_fee_sat = 4;
+
+        /*
+        The amount in satoshis calculated to be paid in fees for the remote
+        commitment.
+        */
+        uint64 remote_commit_fee_sat = 5;
+
+        /*
+        The amount in satoshis calculated to be paid in fees for the remote
+        pending commitment.
+        */
+        uint64 remote_pending_commit_fee_sat = 6;
     }
 
     message ClosedChannel {

lnrpc/rpc.swagger.json

@@ -1617,6 +1617,21 @@
         "remote_pending_txid": {
           "type": "string",
           "description": "/ Hash of the remote pending version of the commitment tx."
+        },
+        "local_commit_fee_sat": {
+          "type": "string",
+          "format": "uint64",
+          "description": "The amount in satoshis calculated to be paid in fees for the local\ncommitment."
+        },
+        "remote_commit_fee_sat": {
+          "type": "string",
+          "format": "uint64",
+          "description": "The amount in satoshis calculated to be paid in fees for the remote\ncommitment."
+        },
+        "remote_pending_commit_fee_sat": {
+          "type": "string",
+          "format": "uint64",
+          "description": "The amount in satoshis calculated to be paid in fees for the remote\npending commitment."
         }
       }
     },

rpcserver.go

@@ -2800,6 +2800,10 @@ func (r *rpcServer) PendingChannels(ctx context.Context,
 			commitments.LocalTxid =
 				waitingClose.LocalCommitment.CommitTx.TxHash().
 					String()
+
+			commitments.LocalCommitFeeSat = uint64(
+				waitingClose.LocalCommitment.CommitFee,
+			)
 		}
 
 		// Report remote commit. May not be present when DLP is active.
@@ -2807,6 +2811,10 @@ func (r *rpcServer) PendingChannels(ctx context.Context,
 			commitments.RemoteTxid =
 				waitingClose.RemoteCommitment.CommitTx.TxHash().
 					String()
+
+			commitments.RemoteCommitFeeSat = uint64(
+				waitingClose.RemoteCommitment.CommitFee,
+			)
 		}
 
 		// Report the remote pending commit if any.
@@ -2826,7 +2834,9 @@ func (r *rpcServer) PendingChannels(ctx context.Context,
 		default:
 			hash := remoteCommitDiff.Commitment.CommitTx.TxHash()
 			commitments.RemotePendingTxid = hash.String()
-
+			commitments.RemoteCommitFeeSat = uint64(
+				remoteCommitDiff.Commitment.CommitFee,
+			)
 		}
 
 		channel := &lnrpc.PendingChannelsResponse_PendingChannel{