kaspad/database/ffldb/driver.go

// Copyright (c) 2015-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package ffldb

import (
	"github.com/daglabs/btcd/database"
	"github.com/daglabs/btcd/wire"
	"github.com/pkg/errors"
)

const (
	dbType = "ffldb"
)

// parseArgs parses the arguments from the database Open/Create methods.
func parseArgs(funcName string, args ...interface{}) (string, wire.BitcoinNet, error) {
	if len(args) != 2 {
		return "", 0, errors.Errorf("invalid arguments to %s.%s -- "+
			"expected database path and block network", dbType,
			funcName)
	}

	dbPath, ok := args[0].(string)
	if !ok {
		return "", 0, errors.Errorf("first argument to %s.%s is invalid -- "+
			"expected database path string", dbType, funcName)
	}

	network, ok := args[1].(wire.BitcoinNet)
	if !ok {
		return "", 0, errors.Errorf("second argument to %s.%s is invalid -- "+
			"expected block network", dbType, funcName)
	}

	return dbPath, network, nil
}

// openDBDriver is the callback provided during driver registration that opens
// an existing database for use.
func openDBDriver(args ...interface{}) (database.DB, error) {
	dbPath, network, err := parseArgs("Open", args...)
	if err != nil {
		return nil, err
	}

	return openDB(dbPath, network, false)
}

// createDBDriver is the callback provided during driver registration that
// creates, initializes, and opens a database for use.
func createDBDriver(args ...interface{}) (database.DB, error) {
	dbPath, network, err := parseArgs("Create", args...)
	if err != nil {
		return nil, err
	}

	return openDB(dbPath, network, true)
}