mirror of
https://github.com/astaxie/beego.git
synced 2024-10-01 11:21:49 +00:00
190 lines
4.2 KiB
Go
190 lines
4.2 KiB
Go
// Copyright 2014 beego Author. 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 memcache for cache provider
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//
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// depend on github.com/bradfitz/gomemcache/memcache
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//
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// go install github.com/bradfitz/gomemcache/memcache
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//
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// Usage:
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// import(
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// _ "github.com/astaxie/beego/cache/memcache"
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// "github.com/astaxie/beego/cache"
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// )
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//
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// bm, err := cache.NewCache("memcache", `{"conn":"127.0.0.1:11211"}`)
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//
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// more docs http://beego.me/docs/module/cache.md
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package memcache
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import (
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"encoding/json"
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"errors"
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"strings"
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"time"
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"github.com/bradfitz/gomemcache/memcache"
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"github.com/astaxie/beego/pkg/cache"
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)
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// Cache Memcache adapter.
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type Cache struct {
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conn *memcache.Client
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conninfo []string
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}
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// NewMemCache creates a new memcache adapter.
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func NewMemCache() cache.Cache {
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return &Cache{}
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}
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// Get get value from memcache.
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func (rc *Cache) Get(key string) interface{} {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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if item, err := rc.conn.Get(key); err == nil {
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return item.Value
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}
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return nil
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}
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// GetMulti gets a value from a key in memcache.
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func (rc *Cache) GetMulti(keys []string) []interface{} {
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size := len(keys)
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var rv []interface{}
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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for i := 0; i < size; i++ {
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rv = append(rv, err)
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}
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return rv
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}
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}
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mv, err := rc.conn.GetMulti(keys)
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if err == nil {
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for _, v := range mv {
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rv = append(rv, v.Value)
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}
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return rv
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}
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for i := 0; i < size; i++ {
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rv = append(rv, err)
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}
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return rv
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}
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// Put puts a value into memcache.
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func (rc *Cache) Put(key string, val interface{}, timeout time.Duration) error {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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item := memcache.Item{Key: key, Expiration: int32(timeout / time.Second)}
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if v, ok := val.([]byte); ok {
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item.Value = v
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} else if str, ok := val.(string); ok {
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item.Value = []byte(str)
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} else {
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return errors.New("val only support string and []byte")
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}
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return rc.conn.Set(&item)
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}
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// Delete deletes a value in memcache.
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func (rc *Cache) Delete(key string) error {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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return rc.conn.Delete(key)
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}
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// Incr increases counter.
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func (rc *Cache) Incr(key string) error {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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_, err := rc.conn.Increment(key, 1)
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return err
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}
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// Decr decreases counter.
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func (rc *Cache) Decr(key string) error {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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_, err := rc.conn.Decrement(key, 1)
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return err
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}
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// IsExist checks if a value exists in memcache.
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func (rc *Cache) IsExist(key string) bool {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return false
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}
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}
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_, err := rc.conn.Get(key)
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return err == nil
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}
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// ClearAll clears all cache in memcache.
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func (rc *Cache) ClearAll() error {
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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return rc.conn.FlushAll()
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}
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// StartAndGC starts the memcache adapter.
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// config: must be in the format {"conn":"connection info"}.
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// If an error occurs during connecting, an error is returned
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func (rc *Cache) StartAndGC(config string) error {
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var cf map[string]string
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json.Unmarshal([]byte(config), &cf)
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if _, ok := cf["conn"]; !ok {
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return errors.New("config has no conn key")
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}
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rc.conninfo = strings.Split(cf["conn"], ";")
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if rc.conn == nil {
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if err := rc.connectInit(); err != nil {
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return err
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}
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}
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return nil
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}
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// connect to memcache and keep the connection.
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func (rc *Cache) connectInit() error {
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rc.conn = memcache.New(rc.conninfo...)
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return nil
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}
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func init() {
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cache.Register("memcache", NewMemCache)
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}
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