snapshot of https://github.com/casbin/casbin.git (master, 2026-09-15; blobs > 131072B omitted)

persist/cache/cache.go

@@ -0,0 +1,42 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 cache
+
+import "errors"
+
+var ErrNoSuchKey = errors.New("there's no such key existing in cache")
+
+type Cache interface {
+	// Set puts key and value into cache.
+	// First parameter for extra should be time.Time object denoting expected survival time.
+	// If survival time equals 0 or less, the key will always be survival.
+	Set(key string, value bool, extra ...interface{}) error
+
+	// Get returns result for key,
+	// If there's no such key existing in cache,
+	// ErrNoSuchKey will be returned.
+	Get(key string) (bool, error)
+
+	// Delete will remove the specific key in cache.
+	// If there's no such key existing in cache,
+	// ErrNoSuchKey will be returned.
+	Delete(key string) error
+
+	// Clear deletes all the items stored in cache.
+	Clear() error
+}

persist/cache/cache_sync.go

@@ -0,0 +1,89 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 cache
+
+import (
+	"sync"
+	"time"
+)
+
+type SyncCache struct {
+	cache DefaultCache
+	sync.RWMutex
+}
+
+func (c *SyncCache) Set(key string, value bool, extra ...interface{}) error {
+	ttl := time.Duration(-1)
+	if len(extra) > 0 {
+		ttl = extra[0].(time.Duration)
+	}
+	c.Lock()
+	defer c.Unlock()
+	c.cache[key] = cacheItem{
+		value:     value,
+		expiresAt: time.Now().Add(ttl),
+		ttl:       ttl,
+	}
+	return nil
+}
+
+func (c *SyncCache) Get(key string) (bool, error) {
+	c.RLock()
+	res, ok := c.cache[key]
+	c.RUnlock()
+	if !ok {
+		return false, ErrNoSuchKey
+	} else {
+		if res.ttl > 0 && time.Now().After(res.expiresAt) {
+			c.Lock()
+			defer c.Unlock()
+			delete(c.cache, key)
+			return false, ErrNoSuchKey
+		}
+		return res.value, nil
+	}
+}
+
+func (c *SyncCache) Delete(key string) error {
+	c.RLock()
+	_, ok := c.cache[key]
+	c.RUnlock()
+	if !ok {
+		return ErrNoSuchKey
+	} else {
+		c.Lock()
+		defer c.Unlock()
+		delete(c.cache, key)
+		return nil
+	}
+}
+
+func (c *SyncCache) Clear() error {
+	c.Lock()
+	c.cache = make(DefaultCache)
+	c.Unlock()
+	return nil
+}
+
+func NewSyncCache() (Cache, error) {
+	cache := SyncCache{
+		make(DefaultCache),
+		sync.RWMutex{},
+	}
+	return &cache, nil
+}

persist/cache/default-cache.go

@@ -0,0 +1,72 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 cache
+
+import "time"
+
+type cacheItem struct {
+	value     bool
+	expiresAt time.Time
+	ttl       time.Duration
+}
+
+type DefaultCache map[string]cacheItem
+
+func (c *DefaultCache) Set(key string, value bool, extra ...interface{}) error {
+	ttl := time.Duration(-1)
+	if len(extra) > 0 {
+		ttl = extra[0].(time.Duration)
+	}
+	(*c)[key] = cacheItem{
+		value:     value,
+		expiresAt: time.Now().Add(ttl),
+		ttl:       ttl,
+	}
+	return nil
+}
+
+func (c *DefaultCache) Get(key string) (bool, error) {
+	if res, ok := (*c)[key]; !ok {
+		return false, ErrNoSuchKey
+	} else {
+		if res.ttl > 0 && time.Now().After(res.expiresAt) {
+			delete(*c, key)
+			return false, ErrNoSuchKey
+		}
+		return res.value, nil
+	}
+}
+
+func (c *DefaultCache) Delete(key string) error {
+	if _, ok := (*c)[key]; !ok {
+		return ErrNoSuchKey
+	} else {
+		delete(*c, key)
+		return nil
+	}
+}
+
+func (c *DefaultCache) Clear() error {
+	*c = make(DefaultCache)
+	return nil
+}
+
+func NewDefaultCache() (Cache, error) {
+	cache := make(DefaultCache)
+	return &cache, nil
+}