memcache.go
2.06 KB
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package cache
import (
"code.google.com/p/vitess/go/memcache"
"encoding/json"
"errors"
)
type MemcacheCache struct {
c *memcache.Connection
conninfo string
}
func NewMemCache() *MemcacheCache {
return &MemcacheCache{}
}
func (rc *MemcacheCache) Get(key string) interface{} {
if rc.c == nil {
rc.c = rc.connectInit()
}
v, err := rc.c.Get(key)
if err != nil {
return nil
}
var contain interface{}
if len(v) > 0 {
contain = string(v[0].Value)
} else {
contain = nil
}
return contain
}
func (rc *MemcacheCache) Put(key string, val interface{}, timeout int64) error {
if rc.c == nil {
rc.c = rc.connectInit()
}
v, ok := val.(string)
if !ok {
return errors.New("val must string")
}
stored, err := rc.c.Set(key, 0, uint64(timeout), []byte(v))
if err == nil && stored == false {
return errors.New("stored fail")
}
return err
}
func (rc *MemcacheCache) Delete(key string) error {
if rc.c == nil {
rc.c = rc.connectInit()
}
_, err := rc.c.Delete(key)
return err
}
func (rc *MemcacheCache) Incr(key string) error {
return errors.New("not support in memcache")
}
func (rc *MemcacheCache) Decr(key string) error {
return errors.New("not support in memcache")
}
func (rc *MemcacheCache) IsExist(key string) bool {
if rc.c == nil {
rc.c = rc.connectInit()
}
v, err := rc.c.Get(key)
if err != nil {
return false
}
if len(v) == 0 {
return false
} else {
return true
}
return true
}
func (rc *MemcacheCache) ClearAll() error {
if rc.c == nil {
rc.c = rc.connectInit()
}
err := rc.c.FlushAll()
return err
}
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 = cf["conn"]
rc.c = rc.connectInit()
if rc.c == nil {
return errors.New("dial tcp conn error")
}
return nil
}
func (rc *MemcacheCache) connectInit() *memcache.Connection {
c, err := memcache.Connect(rc.conninfo)
if err != nil {
return nil
}
return c
}
func init() {
Register("memcache", NewMemCache())
}