lnd.xprv/chainntnfs/neutrinonotify/driver.go

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package neutrinonotify
import (
"errors"
"fmt"
"github.com/lightninglabs/neutrino"
"github.com/lightningnetwork/lnd/blockcache"
"github.com/lightningnetwork/lnd/chainntnfs"
)
// createNewNotifier creates a new instance of the ChainNotifier interface
// implemented by NeutrinoNotifier.
func createNewNotifier(args ...interface{}) (chainntnfs.ChainNotifier, error) {
if len(args) != 4 {
return nil, fmt.Errorf("incorrect number of arguments to "+
".New(...), expected 4, instead passed %v", len(args))
}
config, ok := args[0].(*neutrino.ChainService)
if !ok {
return nil, errors.New("first argument to neutrinonotify.New " +
"is incorrect, expected a *neutrino.ChainService")
}
spendHintCache, ok := args[1].(chainntnfs.SpendHintCache)
if !ok {
return nil, errors.New("second argument to neutrinonotify.New " +
"is incorrect, expected a chainntfs.SpendHintCache")
}
confirmHintCache, ok := args[2].(chainntnfs.ConfirmHintCache)
if !ok {
return nil, errors.New("third argument to neutrinonotify.New " +
"is incorrect, expected a chainntfs.ConfirmHintCache")
}
blockCache, ok := args[3].(*blockcache.BlockCache)
if !ok {
return nil, errors.New("fourth argument to neutrinonotify.New " +
"is incorrect, expected a *blockcache.BlockCache")
}
return New(config, spendHintCache, confirmHintCache, blockCache), nil
}
// init registers a driver for the NeutrinoNotify concrete implementation of
// the chainntnfs.ChainNotifier interface.
func init() {
// Register the driver.
notifier := &chainntnfs.NotifierDriver{
NotifierType: notifierType,
New: createNewNotifier,
}
if err := chainntnfs.RegisterNotifier(notifier); err != nil {
panic(fmt.Sprintf("failed to register notifier driver '%s': %v",
notifierType, err))
}
}