lnd.xprv/lnrpc/walletrpc/driver.go

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// +build walletrpc
package walletrpc
import (
"fmt"
"github.com/lightningnetwork/lnd/lnrpc"
)
// createNewSubServer is a helper method that will create the new WalletKit RPC
// 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.
walletKitServerConf, 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 := walletKitServerConf.(*Config)
if !ok {
return nil, nil, fmt.Errorf("wrong type of config for "+
"subserver %s, expected %T got %T", subServerName,
&Config{}, walletKitServerConf)
}
// Before we try to make the new WalletKit service instance, we'll
// perform some sanity checks on the arguments to ensure that they're
// useable.
switch {
case config.MacService != nil && config.NetworkDir == "":
return nil, nil, fmt.Errorf("NetworkDir must be set to " +
"create WalletKit RPC server")
case config.FeeEstimator == nil:
return nil, nil, fmt.Errorf("FeeEstimator must be set to " +
"create WalletKit RPC server")
case config.Wallet == nil:
return nil, nil, fmt.Errorf("Wallet must be set to create " +
"WalletKit RPC server")
case config.KeyRing == nil:
return nil, nil, fmt.Errorf("KeyRing must be set to create " +
"WalletKit RPC server")
}
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))
}
}