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cache.go
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cache.go
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/*
* Copyright 2013 Nan Deng
*
* 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 msgcache
import (
"crypto/rand"
"encoding/base64"
"fmt"
"github.com/uniqush/uniqush-conn/rpc"
"io"
"sync"
"time"
)
func init() {
Register(&mysqlCacheManager{})
Register(&redisCacheManager{})
}
type Cache interface {
CacheMessage(service, username string, msg *rpc.MessageContainer, ttl time.Duration) (id string, err error)
// XXX Is there any better way to support retrieve all feature?
Get(service, username, id string) (msg *rpc.MessageContainer, err error)
RetrieveAllSince(service, username string, since time.Time) (msgs []*rpc.MessageContainer, err error)
Close() error
}
type CacheManager interface {
GetCache(host, username, password, database string, port int) (Cache, error)
Engine() string
}
var cacheEngineMapLock sync.Mutex
var cacheEngineMap map[string]CacheManager
func Register(cm CacheManager) {
cacheEngineMapLock.Lock()
defer cacheEngineMapLock.Unlock()
if cacheEngineMap == nil {
cacheEngineMap = make(map[string]CacheManager, 10)
}
cacheEngineMap[cm.Engine()] = cm
}
func GetCache(engine, host, username, password, database string, port int) (Cache, error) {
cacheEngineMapLock.Lock()
defer cacheEngineMapLock.Unlock()
if c, ok := cacheEngineMap[engine]; ok {
return c.GetCache(host, username, password, database, port)
}
return nil, fmt.Errorf("%v is not supported", engine)
}
func randomId() string {
var d [8]byte
io.ReadFull(rand.Reader, d[:])
return fmt.Sprintf("%x-%v", time.Now().Unix(), base64.URLEncoding.EncodeToString(d[:]))
}