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// Copyright 2018 The casbin Authors. All Rights Reserved.
//
// 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 casbin
import (
"sync"
"sync/atomic"
"time"
"github.com/casbin/casbin/v2/persist/cache"
)
// SyncedCachedEnforcer wraps Enforcer and provides decision sync cache.
type SyncedCachedEnforcer struct {
*SyncedEnforcer
expireTime time.Duration
cache cache.Cache
enableCache int32
locker *sync.RWMutex
}
// NewSyncedCachedEnforcer creates a sync cached enforcer via file or DB.
func NewSyncedCachedEnforcer(params ...interface{}) (*SyncedCachedEnforcer, error) {
e := &SyncedCachedEnforcer{}
var err error
e.SyncedEnforcer, err = NewSyncedEnforcer(params...)
if err != nil {
return nil, err
}
e.enableCache = 1
e.cache, _ = cache.NewSyncCache()
e.locker = new(sync.RWMutex)
return e, nil
}
// EnableCache determines whether to enable cache on Enforce(). When enableCache is enabled, cached result (true | false) will be returned for previous decisions.
func (e *SyncedCachedEnforcer) EnableCache(enableCache bool) {
var enabled int32
if enableCache {
enabled = 1
}
atomic.StoreInt32(&e.enableCache, enabled)
}
// Enforce decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (sub, obj, act).
// if rvals is not string , ignore the cache.
func (e *SyncedCachedEnforcer) Enforce(rvals ...interface{}) (bool, error) {
if atomic.LoadInt32(&e.enableCache) == 0 {
return e.SyncedEnforcer.Enforce(rvals...)
}
key, ok := e.getKey(rvals...)
if !ok {
return e.SyncedEnforcer.Enforce(rvals...)
}
if res, err := e.getCachedResult(key); err == nil {
return res, nil
} else if err != cache.ErrNoSuchKey {
return res, err
}
res, err := e.SyncedEnforcer.Enforce(rvals...)
if err != nil {
return false, err
}
err = e.setCachedResult(key, res, e.expireTime)
return res, err
}
func (e *SyncedCachedEnforcer) LoadPolicy() error {
if atomic.LoadInt32(&e.enableCache) != 0 {
if err := e.cache.Clear(); err != nil {
return err
}
}
return e.SyncedEnforcer.LoadPolicy()
}
func (e *SyncedCachedEnforcer) AddPolicy(params ...interface{}) (bool, error) {
if ok, err := e.checkOneAndRemoveCache(params...); !ok {
return ok, err
}
return e.SyncedEnforcer.AddPolicy(params...)
}
func (e *SyncedCachedEnforcer) AddPolicies(rules [][]string) (bool, error) {
if ok, err := e.checkManyAndRemoveCache(rules); !ok {
return ok, err
}
return e.SyncedEnforcer.AddPolicies(rules)
}
func (e *SyncedCachedEnforcer) RemovePolicy(params ...interface{}) (bool, error) {
if ok, err := e.checkOneAndRemoveCache(params...); !ok {
return ok, err
}
return e.SyncedEnforcer.RemovePolicy(params...)
}
func (e *SyncedCachedEnforcer) RemovePolicies(rules [][]string) (bool, error) {
if ok, err := e.checkManyAndRemoveCache(rules); !ok {
return ok, err
}
return e.SyncedEnforcer.RemovePolicies(rules)
}
func (e *SyncedCachedEnforcer) getCachedResult(key string) (res bool, err error) {
return e.cache.Get(key)
}
func (e *SyncedCachedEnforcer) SetExpireTime(expireTime time.Duration) {
e.locker.Lock()
defer e.locker.Unlock()
e.expireTime = expireTime
}
// SetCache need to be sync cache.
func (e *SyncedCachedEnforcer) SetCache(c cache.Cache) {
e.locker.Lock()
defer e.locker.Unlock()
e.cache = c
}
func (e *SyncedCachedEnforcer) setCachedResult(key string, res bool, extra ...interface{}) error {
return e.cache.Set(key, res, extra...)
}
func (e *SyncedCachedEnforcer) getKey(params ...interface{}) (string, bool) {
return GetCacheKey(params...)
}
// InvalidateCache deletes all the existing cached decisions.
func (e *SyncedCachedEnforcer) InvalidateCache() error {
return e.cache.Clear()
}
func (e *SyncedCachedEnforcer) checkOneAndRemoveCache(params ...interface{}) (bool, error) {
if atomic.LoadInt32(&e.enableCache) != 0 {
key, ok := e.getKey(params...)
if ok {
if err := e.cache.Delete(key); err != nil && err != cache.ErrNoSuchKey {
return false, err
}
}
}
return true, nil
}
func (e *SyncedCachedEnforcer) checkManyAndRemoveCache(rules [][]string) (bool, error) {
if len(rules) != 0 {
if atomic.LoadInt32(&e.enableCache) != 0 {
irule := make([]interface{}, len(rules[0]))
for _, rule := range rules {
for i, param := range rule {
irule[i] = param
}
key, _ := e.getKey(irule...)
if err := e.cache.Delete(key); err != nil && err != cache.ErrNoSuchKey {
return false, err
}
}
}
}
return true, nil
}
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