lnd.xprv/chainntnfs/bitcoindnotify/driver.go

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package bitcoindnotify
import (
"errors"
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"fmt"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcwallet/chain"
"github.com/lightningnetwork/lnd/blockcache"
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"github.com/lightningnetwork/lnd/chainntnfs"
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)
// createNewNotifier creates a new instance of the ChainNotifier interface
// implemented by BitcoindNotifier.
func createNewNotifier(args ...interface{}) (chainntnfs.ChainNotifier, error) {
if len(args) != 5 {
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return nil, fmt.Errorf("incorrect number of arguments to "+
".New(...), expected 5, instead passed %v", len(args))
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}
chainConn, ok := args[0].(*chain.BitcoindConn)
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if !ok {
return nil, errors.New("first argument to bitcoindnotify.New " +
"is incorrect, expected a *chain.BitcoindConn")
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}
chainParams, ok := args[1].(*chaincfg.Params)
if !ok {
return nil, errors.New("second argument to bitcoindnotify.New " +
"is incorrect, expected a *chaincfg.Params")
}
spendHintCache, ok := args[2].(chainntnfs.SpendHintCache)
if !ok {
return nil, errors.New("third argument to bitcoindnotify.New " +
"is incorrect, expected a chainntnfs.SpendHintCache")
}
confirmHintCache, ok := args[3].(chainntnfs.ConfirmHintCache)
if !ok {
return nil, errors.New("fourth argument to bitcoindnotify.New " +
"is incorrect, expected a chainntnfs.ConfirmHintCache")
}
blockCache, ok := args[4].(*blockcache.BlockCache)
if !ok {
return nil, errors.New("fifth argument to bitcoindnotify.New " +
"is incorrect, expected a *blockcache.BlockCache")
}
return New(chainConn, chainParams, spendHintCache,
confirmHintCache, blockCache), nil
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}
// init registers a driver for the BtcdNotifier 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))
}
}