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Beego/cache/memcache/memcache.go
2014-08-18 16:41:43 +08:00

164 lines
3.6 KiB
Go

// Copyright 2014 beego Author. 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 memcahe for cache provider
//
// depend on github.com/bradfitz/gomemcache/memcache
//
// go install github.com/bradfitz/gomemcache/memcache
//
// Usage:
// import(
// _ "github.com/astaxie/beego/cache/memcache"
// "github.com/astaxie/beego/cache"
// )
//
// bm, err := cache.NewCache("memcache", `{"conn":"127.0.0.1:11211"}`)
//
// more docs http://beego.me/docs/module/cache.md
package memcache
import (
"encoding/json"
"errors"
"strings"
"github.com/bradfitz/gomemcache/memcache"
"github.com/astaxie/beego/cache"
)
// Memcache adapter.
type MemcacheCache struct {
conn *memcache.Client
conninfo []string
}
// create new memcache adapter.
func NewMemCache() *MemcacheCache {
return &MemcacheCache{}
}
// get value from memcache.
func (rc *MemcacheCache) Get(key string) interface{} {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
if item, err := rc.conn.Get(key); err == nil {
return string(item.Value)
}
return nil
}
// put value to memcache. only support string.
func (rc *MemcacheCache) Put(key string, val interface{}, timeout int64) error {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
v, ok := val.(string)
if !ok {
return errors.New("val must string")
}
item := memcache.Item{Key: key, Value: []byte(v), Expiration: int32(timeout)}
return rc.conn.Set(&item)
}
// delete value in memcache.
func (rc *MemcacheCache) Delete(key string) error {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
return rc.conn.Delete(key)
}
// increase counter.
func (rc *MemcacheCache) Incr(key string) error {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
_, err := rc.conn.Increment(key, 1)
return err
}
// decrease counter.
func (rc *MemcacheCache) Decr(key string) error {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
_, err := rc.conn.Decrement(key, 1)
return err
}
// check value exists in memcache.
func (rc *MemcacheCache) IsExist(key string) bool {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return false
}
}
_, err := rc.conn.Get(key)
if err != nil {
return false
}
return true
}
// clear all cached in memcache.
func (rc *MemcacheCache) ClearAll() error {
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
return rc.conn.FlushAll()
}
// start memcache adapter.
// config string is like {"conn":"connection info"}.
// if connecting error, return.
func (rc *MemcacheCache) StartAndGC(config string) error {
var cf map[string]string
json.Unmarshal([]byte(config), &cf)
if _, ok := cf["conn"]; !ok {
return errors.New("config has no conn key")
}
rc.conninfo = strings.Split(cf["conn"], ";")
if rc.conn == nil {
if err := rc.connectInit(); err != nil {
return err
}
}
return nil
}
// connect to memcache and keep the connection.
func (rc *MemcacheCache) connectInit() error {
rc.conn = memcache.New(rc.conninfo...)
return nil
}
func init() {
cache.Register("memcache", NewMemCache())
}