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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 (
"strings"
"sync"
)
// CachedEnforcer wraps Enforcer and provides decision cache
type CachedEnforcer struct {
*Enforcer
m map[string]bool
enableCache bool
locker *sync.RWMutex
}
// NewCachedEnforcer creates a cached enforcer via file or DB.
func NewCachedEnforcer(params ...interface{}) (*CachedEnforcer, error) {
e := &CachedEnforcer{}
var err error
e.Enforcer, err = NewEnforcer(params...)
if err != nil {
return nil, err
}
e.enableCache = true
e.m = make(map[string]bool)
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 *CachedEnforcer) EnableCache(enableCache bool) {
e.enableCache = enableCache
}
// 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 , ingore the cache
func (e *CachedEnforcer) Enforce(rvals ...interface{}) (bool, error) {
if !e.enableCache {
return e.Enforcer.Enforce(rvals...)
}
var key strings.Builder
for _, rval := range rvals {
if val, ok := rval.(string); ok {
key.WriteString(val)
key.WriteString("$$")
} else {
return e.Enforcer.Enforce(rvals...)
}
}
if res, ok := e.getCachedResult(key.String()); ok {
return res, nil
}
res, err := e.Enforcer.Enforce(rvals...)
if err != nil {
return false, err
}
e.setCachedResult(key.String(), res)
return res, nil
}
func (e *CachedEnforcer) getCachedResult(key string) (res bool, ok bool) {
e.locker.RLock()
defer e.locker.RUnlock()
res, ok = e.m[key]
return res, ok
}
func (e *CachedEnforcer) setCachedResult(key string, res bool) {
e.locker.Lock()
defer e.locker.Unlock()
e.m[key] = res
}
// InvalidateCache deletes all the existing cached decisions.
func (e *CachedEnforcer) InvalidateCache() {
e.m = make(map[string]bool)
}
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