feat: Extend GetInfo RPC with LND identity, node alias, block height, and block hash

Added additional fields to the GetInfo RPC response to provide richer details about the blockchain and the LND node. This includes the LND node's public key (identity), its alias, the current block height, and the latest block's hash.

Author: ben2077

rpcserver.go

@@ -284,13 +284,30 @@ func (r *rpcServer) DebugLevel(ctx context.Context,
 
 // GetInfo returns general information relating to the active daemon. For
 // example: its version, network, and lnd version.
-func (r *rpcServer) GetInfo(context.Context,
-	*taprpc.GetInfoRequest) (*taprpc.GetInfoResponse, error) {
+func (r *rpcServer) GetInfo(ctx context.Context,
+	_ *taprpc.GetInfoRequest) (*taprpc.GetInfoResponse, error) {
+
+	// Retrieve the best block hash and height from the chain backend.
+	blockHash, blockHeight, err := r.cfg.Lnd.ChainKit.GetBestBlock(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// Retrieve the current lnd node's info.
+	info, err := r.cfg.Lnd.Client.GetInfo(context.Background())
+	if err != nil {
+		return nil, err
+	}
 
 	return &taprpc.GetInfoResponse{
-		Version:    Version(),
-		LndVersion: r.cfg.Lnd.Version.Version,
-		Network:    r.cfg.ChainParams.Name,
+		Version:           Version(),
+		LndVersion:        r.cfg.Lnd.Version.Version,
+		Network:           r.cfg.ChainParams.Name,
+		LndIdentityPubkey: r.cfg.Lnd.NodePubkey.String(),
+		NodeAlias:         info.Alias,
+		BlockHeight:       uint32(blockHeight),
+		BlockHash:         blockHash.String(),
+		SyncToChain:       info.SyncedToChain,
 	}, nil
 }