mirror of https://github.com/astaxie/beego.git
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
// Copyright 2018 The casbin Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package casbin
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import (
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"sync"
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)
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// CachedEnforcer wraps Enforcer and provides decision cache
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type CachedEnforcer struct {
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*Enforcer
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m map[string]bool
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enableCache bool
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locker *sync.Mutex
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}
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// NewCachedEnforcer creates a cached enforcer via file or DB.
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func NewCachedEnforcer(params ...interface{}) *CachedEnforcer {
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e := &CachedEnforcer{}
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e.Enforcer = NewEnforcer(params...)
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e.enableCache = true
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e.m = make(map[string]bool)
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e.locker = new(sync.Mutex)
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return e
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}
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// EnableCache determines whether to enable cache on Enforce(). When enableCache is enabled, cached result (true | false) will be returned for previous decisions.
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func (e *CachedEnforcer) EnableCache(enableCache bool) {
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e.enableCache = enableCache
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}
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// Enforce decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (sub, obj, act).
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// if rvals is not string , ingore the cache
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func (e *CachedEnforcer) Enforce(rvals ...interface{}) bool {
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if !e.enableCache {
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return e.Enforcer.Enforce(rvals...)
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}
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key := ""
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for _, rval := range rvals {
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if val, ok := rval.(string); ok {
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key += val + "$$"
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} else {
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return e.Enforcer.Enforce(rvals...)
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}
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}
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e.locker.Lock()
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defer e.locker.Unlock()
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if _, ok := e.m[key]; ok {
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return e.m[key]
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} else {
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res := e.Enforcer.Enforce(rvals...)
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e.m[key] = res
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return res
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}
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}
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// InvalidateCache deletes all the existing cached decisions.
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func (e *CachedEnforcer) InvalidateCache() {
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e.m = make(map[string]bool)
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}
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