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driver.go
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driver.go
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// Copyright (c) 2015-2016 The btcsuite developers
// Copyright (c) 2016 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package ffldb
import (
"fmt"
"github.com/btcsuite/btclog"
"github.com/decred/dcrd/database"
"github.com/decred/dcrd/wire"
)
var log = btclog.Disabled
const (
dbType = "ffldb"
)
// parseArgs parses the arguments from the database Open/Create methods.
func parseArgs(funcName string, args ...interface{}) (string, wire.CurrencyNet, error) {
if len(args) != 2 {
return "", 0, fmt.Errorf("invalid arguments to %s.%s -- "+
"expected database path and block network", dbType,
funcName)
}
dbPath, ok := args[0].(string)
if !ok {
return "", 0, fmt.Errorf("first argument to %s.%s is invalid -- "+
"expected database path string", dbType, funcName)
}
network, ok := args[1].(wire.CurrencyNet)
if !ok {
return "", 0, fmt.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)
}
// useLogger is the callback provided during driver registration that sets the
// current logger to the provided one.
func useLogger(logger btclog.Logger) {
log = logger
}
func init() {
// Register the driver.
driver := database.Driver{
DbType: dbType,
Create: createDBDriver,
Open: openDBDriver,
UseLogger: useLogger,
}
if err := database.RegisterDriver(driver); err != nil {
panic(fmt.Sprintf("Failed to regiser database driver '%s': %v",
dbType, err))
}
}