package wtclientrpc import ( "errors" "fmt" "github.com/lightningnetwork/lnd/lnrpc" ) // createNewSubServer is a helper method that will create the new sub server // given the main config dispatcher method. If we're unable to find the config // that is meant for us in the config dispatcher, then we'll exit with an // error. func createNewSubServer(configRegistry lnrpc.SubServerConfigDispatcher) ( lnrpc.SubServer, lnrpc.MacaroonPerms, error) { // We'll attempt to look up the config that we expect, according to our // subServerName name. If we can't find this, then we'll exit with an // error, as we're unable to properly initialize ourselves without this // config. subServerConf, ok := configRegistry.FetchConfig(subServerName) if !ok { return nil, nil, fmt.Errorf("unable to find config for "+ "subserver type %s", subServerName) } // Now that we've found an object mapping to our service name, we'll // ensure that it's the type we need. config, ok := subServerConf.(*Config) if !ok { return nil, nil, fmt.Errorf("wrong type of config for "+ "subserver %s, expected %T got %T", subServerName, &Config{}, subServerConf) } // Before we try to make the new service instance, we'll perform // some sanity checks on the arguments to ensure that they're useable. switch { case config.Resolver == nil: return nil, nil, errors.New("a lncfg.TCPResolver is required") } return New(config) } func init() { subServer := &lnrpc.SubServerDriver{ SubServerName: subServerName, New: func(c lnrpc.SubServerConfigDispatcher) (lnrpc.SubServer, lnrpc.MacaroonPerms, error) { return createNewSubServer(c) }, } // If the build tag is active, then we'll register ourselves as a // sub-RPC server within the global lnrpc package namespace. if err := lnrpc.RegisterSubServer(subServer); err != nil { panic(fmt.Sprintf("failed to register sub server driver "+ "'%s': %v", subServerName, err)) } }