terminal: register Proxy server with Lit's grpc server

We eventually want a few Lit grpc servers to continue functioning even
if LND did not start up properly. This means that we need to register
these servers with LiT's grpc server instead of using LND's.
Because of this change, we also need to update the itest a bit so that
calls to the proxy server are never expected to succeed if the call is
made via the LND port.

Author: ellemouton

itest/litd_mode_integrated_test.go

@@ -217,6 +217,11 @@ var (
 
 		// noAuth is true if the call does not require a macaroon.
 		noAuth bool
+
+		// litOnly is true if the endpoint is only being served on
+		// Lit's grpc server and so will never be accessible via the
+		// LND port.
+		litOnly bool
 	}{{
 		name:              "lnrpc",
 		macaroonFn:        lndMacaroonFn,
@@ -332,6 +337,7 @@ var (
 		allowedThroughLNC: false,
 		grpcWebURI:        "/litrpc.Proxy/GetInfo",
 		restWebURI:        "/v1/proxy/info",
+		litOnly:           true,
 	}}
 
 	// customURIs is a map of endpoint URIs that we want to allow via a
@@ -457,7 +463,7 @@ func integratedTestSuite(ctx context.Context, net *NetworkHarness, t *testing.T,
 					endpoint.noAuth,
 					endpoint.requestFn,
 					endpoint.successPattern,
-					endpointDisabled,
+					endpointDisabled || endpoint.litOnly,
 					"Unimplemented desc = unknown service",
 				)
 			})
@@ -490,7 +496,7 @@ func integratedTestSuite(ctx context.Context, net *NetworkHarness, t *testing.T,
 					cfg.UIPassword, endpoint.requestFn,
 					endpoint.noAuth,
 					true, endpoint.successPattern,
-					endpointDisabled,
+					endpointDisabled || endpoint.litOnly,
 					"Unimplemented desc = unknown service",
 				)
 			})
@@ -560,7 +566,7 @@ func integratedTestSuite(ctx context.Context, net *NetworkHarness, t *testing.T,
 					superMacFile, endpoint.noAuth,
 					endpoint.requestFn,
 					endpoint.successPattern,
-					endpointDisabled,
+					endpointDisabled || endpoint.litOnly,
 					"Unimplemented desc = unknown service",
 				)
 			})

terminal.go

@@ -242,6 +242,10 @@ func (g *LightningTerminal) Run() error {
 		g.cfg, g, g.validateSuperMacaroon, g.permsMgr, g.subServerMgr,
 	)
 
+	// Register any gRPC services that should be served using LiT's
+	// gRPC server regardless of the LND mode being used.
+	litrpc.RegisterProxyServer(g.rpcProxy.grpcServer, g.rpcProxy)
+
 	// Start the main web server that dispatches requests either to the
 	// static UI file server or the RPC proxy. This makes it possible to
 	// unlock lnd through the UI.
@@ -915,7 +919,6 @@ func (g *LightningTerminal) registerSubDaemonGrpcServers(server *grpc.Server,
 	if withLitRPC {
 		litrpc.RegisterSessionsServer(server, g.sessionRpcServer)
 		litrpc.RegisterAccountsServer(server, g.accountRpcServer)
-		litrpc.RegisterProxyServer(server, g.rpcProxy)
 	}
 
 	litrpc.RegisterFirewallServer(server, g.sessionRpcServer)