package etcd import ( "fmt" "github.com/btcsuite/btcwallet/walletdb" ) const ( dbType = "etcd" ) // parseArgs parses the arguments from the walletdb Open/Create methods. func parseArgs(funcName string, args ...interface{}) (*BackendConfig, error) { if len(args) != 1 { return nil, fmt.Errorf("invalid number of arguments to %s.%s -- "+ "expected: etcd.BackendConfig", dbType, funcName, ) } config, ok := args[0].(BackendConfig) if !ok { return nil, fmt.Errorf("argument to %s.%s is invalid -- "+ "expected: etcd.BackendConfig", dbType, funcName, ) } return &config, nil } // createDBDriver is the callback provided during driver registration that // creates, initializes, and opens a database for use. func createDBDriver(args ...interface{}) (walletdb.DB, error) { config, err := parseArgs("Create", args...) if err != nil { return nil, err } return newEtcdBackend(*config) } // openDBDriver is the callback provided during driver registration that opens // an existing database for use. func openDBDriver(args ...interface{}) (walletdb.DB, error) { config, err := parseArgs("Open", args...) if err != nil { return nil, err } return newEtcdBackend(*config) } func init() { // Register the driver. driver := walletdb.Driver{ DbType: dbType, Create: createDBDriver, Open: openDBDriver, } if err := walletdb.RegisterDriver(driver); err != nil { panic(fmt.Sprintf("Failed to regiser database driver '%s': %v", dbType, err)) } }