lnd.xprv/lnrpc/signrpc/driver.go

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// +build signrpc
package signrpc
import (
"fmt"
"github.com/lightningnetwork/lnd/lnrpc"
)
// createNewSubServer is a helper method that will create the new signer 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) (
*Server, 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.
signServerConf, 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 := signServerConf.(*Config)
if !ok {
return nil, nil, fmt.Errorf("wrong type of config for "+
"subserver %s, expected %T got %T", subServerName,
&Config{}, signServerConf)
}
// Before we try to make the new signer service instance, we'll perform
// some sanity checks on the arguments to ensure that they're useable.
switch {
// If the macaroon service is set (we should use macaroons), then
// ensure that we know where to look for them, or create them if not
// found.
case config.MacService != nil && config.NetworkDir == "":
return nil, nil, fmt.Errorf("NetworkDir must be set to create " +
"Signrpc")
case config.Signer == nil:
return nil, nil, fmt.Errorf("Signer must be set to create " +
"Signrpc")
}
return New(config)
}
func init() {
subServer := &lnrpc.SubServerDriver{
SubServerName: subServerName,
NewGrpcHandler: func() lnrpc.GrpcHandler {
return &ServerShell{}
},
}
// 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))
}
}