Add peer_scid_alias field to lnrpc.Channel

docs/release-notes/release-notes-0.16.1.md

@@ -39,6 +39,8 @@
 - A [debug log](https://github.com/lightningnetwork/lnd/pull/7514) has been
   added to `lnrpc` so the node operator can know whether a certain request has
   happened or not.
+* [Add peer_scid_alias to the response of 
+  `listchannels`](https://github.com/lightningnetwork/lnd/pull/7366)
 
 # Contributors (Alphabetical Order)
 

lnrpc/lightning.proto

@@ -1542,6 +1542,9 @@ message Channel {
 
     // The configured alias name of our peer.
     string peer_alias = 34;
+
+    // This is the peer SCID alias.
+    uint64 peer_scid_alias = 35 [jstype = JS_STRING];
 }
 
 message ListChannelsRequest {

lnrpc/lightning.swagger.json

@@ -3568,6 +3568,11 @@
         "peer_alias": {
           "type": "string",
           "description": "The configured alias name of our peer."
+        },
+        "peer_scid_alias": {
+          "type": "string",
+          "format": "uint64",
+          "description": "This is the peer SCID alias."
         }
       }
     },

rpcserver.go

@@ -4097,6 +4097,7 @@ func createRPCOpenChannel(r *rpcServer, dbChannel *channeldb.OpenChannel,
 	nodePub := dbChannel.IdentityPub
 	nodeID := hex.EncodeToString(nodePub.SerializeCompressed())
 	chanPoint := dbChannel.FundingOutpoint
+	chanID := lnwire.NewChanIDFromOutPoint(&chanPoint)
 
 	// As this is required for display purposes, we'll calculate
 	// the weight of the commitment transaction. We also add on the
@@ -4132,6 +4133,10 @@ func createRPCOpenChannel(r *rpcServer, dbChannel *channeldb.OpenChannel,
 	// Fetch the set of aliases for the channel.
 	channelAliases := r.server.aliasMgr.GetAliases(dbScid)
 
+	// Fetch the peer alias. If one does not exist, errNoPeerAlias
+	// is returned and peerScidAlias will be an empty ShortChannelID.
+	peerScidAlias, _ := r.server.aliasMgr.GetPeerAlias(chanID)
+
 	channel := &lnrpc.Channel{
 		Active:                isActive,
 		Private:               isPrivate(dbChannel),
@@ -4160,6 +4165,7 @@ func createRPCOpenChannel(r *rpcServer, dbChannel *channeldb.OpenChannel,
 			&dbChannel.RemoteChanCfg,
 		),
 		AliasScids:            make([]uint64, 0, len(channelAliases)),
+		PeerScidAlias:         peerScidAlias.ToUint64(),
 		ZeroConf:              dbChannel.IsZeroConf(),
 		ZeroConfConfirmedScid: dbChannel.ZeroConfRealScid().ToUint64(),
 		// TODO: remove the following deprecated fields