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memcache.go
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memcache.go
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package frame
import (
"github.com/bradfitz/gomemcache/memcache"
"runtime/debug"
"sync"
)
// memcached 基础结构体 实现了很多mc的基础方法
// 需要不断新增和完善
// 不直接对外服务 通过定义新的结构体继承来对外提供服务
type memcached struct {
mc *memcache.Client
mcOnce sync.Once
GroupName string
}
func (mc *memcached) getPool() *memcache.Client {
if mc.mc == nil {
mc.mcOnce.Do(func() {
mc.mc = getMc(mc.GroupName)
})
}
return mc.mc
}
func (mc *memcached) Get(key string) (string, error) {
result, err := mc.getPool().Get(key)
defer func() {
mcError(err)
}()
if err != nil {
if err == memcache.ErrCacheMiss {
err = nil
return "", nil
}
return "", err
}
return string(result.Value), nil
}
func (mc *memcached) Set(key string, value interface{}, ttl ...int) bool {
ttlTime := 0
if len(ttl) > 0 {
ttlTime = ttl[0]
}
err := mc.getPool().Set(&memcache.Item{Key: key, Value: []byte(convertToString(value)), Expiration: int32(ttlTime)})
defer func() {
mcError(err)
}()
if err != nil {
return false
}
return true
}
func (mc *memcached) Delete(key string) bool {
err := mc.getPool().Delete(key)
defer func() {
mcError(err)
}()
if err != nil {
if err == memcache.ErrCacheMiss {
err = nil
return true
}
return false
}
return true
}
func (mc *memcached) Increment(key string, options ...int) (int, error) {
step := 1
if len(options) > 0 {
step = options[0]
}
res, err := mc.getPool().Increment(key, uint64(step))
defer func() {
mcError(err)
}()
if err != nil {
if err != memcache.ErrCacheMiss {
return 0, err
}
mc.Set(key, 0)
res, err := mc.getPool().Increment(key, uint64(step))
if err != nil {
return 0, err
}
return int(res), nil
}
return int(res), nil
}
func (mc *memcached) Decrement(key string, options ...int) (int, error) {
step := 1
if len(options) > 0 {
step = options[0]
}
res, err := mc.getPool().Decrement(key, uint64(step))
defer func() {
mcError(err)
}()
if err != nil {
if err != memcache.ErrCacheMiss {
return 0, err
}
return 0, nil
}
return int(res), nil
}
func mcError(err error) {
if err != nil && err != memcache.ErrCacheMiss {
msg := map[string]interface{}{
"error": err.Error(),
"stack": string(debug.Stack()),
}
App().Log.Error(msg, LogMemcachedError)
}
}