loopd: check lnd version and subservers

Author: guggero

loopd/start.go

@@ -12,10 +12,25 @@ import (
 	"github.com/lightninglabs/loop"
 	"github.com/lightninglabs/loop/lndclient"
 	"github.com/lightningnetwork/lnd/build"
+	"github.com/lightningnetwork/lnd/lnrpc/verrpc"
 )
 
 const defaultConfigFilename = "loopd.conf"
 
+var (
+	// LoopMinRequiredLndVersion is the minimum required version of lnd that
+	// is compatible with the current version of the loop client. Also all
+	// listed build tags/subservers need to be enabled.
+	LoopMinRequiredLndVersion = &verrpc.Version{
+		AppMajor: 0,
+		AppMinor: 10,
+		AppPatch: 0,
+		BuildTags: []string{
+			"signrpc", "walletrpc", "chainrpc", "invoicesrpc",
+		},
+	}
+)
+
 // RPCConfig holds optional options that can be used to make the loop daemon
 // communicate on custom connections.
 type RPCConfig struct {
@@ -55,10 +70,11 @@ func newListenerCfg(config *config, rpcCfg RPCConfig) *listenerCfg {
 			*lndclient.GrpcLndServices, error) {
 
 			svcCfg := &lndclient.LndServicesConfig{
-				LndAddress:  cfg.Host,
-				Network:     network,
-				MacaroonDir: cfg.MacaroonDir,
-				TLSPath:     cfg.TLSPath,
+				LndAddress:   cfg.Host,
+				Network:      network,
+				MacaroonDir:  cfg.MacaroonDir,
+				TLSPath:      cfg.TLSPath,
+				CheckVersion: LoopMinRequiredLndVersion,
 			}
 
 			// If a custom lnd connection is specified we use that