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store.go
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store.go
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// Copyright 2016 ego authors
//
// 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 store
import (
"fmt"
"os"
)
const (
// DefaultStore default store engine
DefaultStore = "ldb"
// DefaultStore = "bad"
// DefaultStore = "bolt"
)
var supportedStore = map[string]func(path string) (Store, error){
"ldb": OpenLeveldb,
"bg": OpenBadger, // bad to bg
"bolt": OpenBolt,
// "kv": OpenKV,
// "ledisdb": Open,
}
// RegisterStore register store engine
func RegisterStore(name string, fn func(path string) (Store, error)) {
supportedStore[name] = fn
}
// Store is store interface
type Store interface {
// type KVBatch interface {
Set(k, v []byte) error
Get(k []byte) ([]byte, error)
Delete(k []byte) error
Has(k []byte) (bool, error)
ForEach(fn func(k, v []byte) error) error
Close() error
WALName() string
}
// OpenStore open store engine
func OpenStore(path string, args ...string) (Store, error) {
storeName := DefaultStore
if len(args) > 0 && args[0] != "" {
storeName = args[0]
} else {
storeEnv := os.Getenv("Riot_Store_Engine")
if storeEnv != "" {
storeName = storeEnv
}
}
if fn, has := supportedStore[storeName]; has {
return fn(path)
}
return nil, fmt.Errorf("unsupported store engine: %v", storeName)
}