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db.go
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db.go
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// Copyright 2015-present Oursky Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package skydb
import (
"fmt"
)
var drivers = map[string]Driver{}
// Register makes an Skygear Server database driver available
// with the given name.
//
// Register panics if it is called with a nil driver or
// the same driver name is being registered twice.
func Register(name string, driver Driver) {
if driver == nil {
panic("skydb: Register driver is nil")
}
if _, dup := drivers[name]; dup {
panic("skydb: Register called twice for driver " + name)
}
drivers[name] = driver
}
// unregisterAllDrivers unregisters all previously registered drivers.
// Intended for testing.
func unregisterAllDrivers() {
drivers = map[string]Driver{}
}
var accessModelMap = map[string]AccessModel{
"role": RoleBasedAccess,
"relation": RelationBasedAccess,
}
// GetAccessModel convert the string config to internal const
func GetAccessModel(accessString string) AccessModel {
var (
model AccessModel
ok bool
)
if model, ok = accessModelMap[accessString]; !ok {
fmt.Errorf("Received a not supported Access Contol option: %v", accessString)
}
return model
}
// Open returns an implementation of Conn to use w.r.t implName.
//
// optionString is passed to the driver and is implementation specific.
// For example, in a SQL implementation it will be something
// like "sql://localhost/db0"
func Open(implName string, appName string, accessString string, optionString string, migrate bool) (Conn, error) {
accessModel := GetAccessModel(accessString)
if driver, ok := drivers[implName]; ok {
return driver.Open(appName, accessModel, optionString, migrate)
}
return nil, fmt.Errorf("Implementation not registered: %v", implName)
}