forked from reborndb/qdb
/
driver.go
78 lines (58 loc) · 1.46 KB
/
driver.go
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// Copyright 2015 Reborndb Org. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package engine
import (
"fmt"
"strings"
"sync"
"github.com/juju/errors"
)
type Driver interface {
Open(path string, conf interface{}, repair bool) (Database, error)
}
var drivers map[string]Driver
var driverLock sync.Mutex
func getDriver(name string) (Driver, error) {
driverLock.Lock()
defer driverLock.Unlock()
name = strings.ToLower(name)
d, ok := drivers[name]
if !ok {
return nil, fmt.Errorf("%s is not registered", name)
}
return d, nil
}
// Opens a database specified by its database driver name.
func Open(name string, path string, conf interface{}, repair bool) (Database, error) {
d, err := getDriver(name)
if err != nil {
return nil, errors.Trace(err)
}
return d.Open(path, conf, repair)
}
// Returns current registered drivers
func Drivers() []string {
driverLock.Lock()
defer driverLock.Unlock()
ds := make([]string, 0, len(drivers))
for name, _ := range drivers {
ds = append(ds, name)
}
return ds
}
// Registers a database driver by the specified driver name.
func Register(name string, driver Driver) {
driverLock.Lock()
defer driverLock.Unlock()
name = strings.ToLower(name)
if driver == nil {
panic(fmt.Sprintf("Empty driver for %s", name))
}
if _, ok := drivers[name]; ok {
panic(fmt.Sprintf("%s has been already registered", name))
}
drivers[name] = driver
}
func init() {
drivers = make(map[string]Driver)
}