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cache_runtime.go
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269 lines (244 loc) · 5.79 KB
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package runtime
import (
"errors"
"fmt"
"strconv"
"sync"
"time"
)
var (
// DefaultGCInterval means gc interval.
DefaultGCInterval = 60 * time.Second // 1 minute
ZeroInt64 int64 = 0
)
// RuntimeItem store runtime cache item.
type RuntimeItem struct {
value interface{}
createTime time.Time
ttl time.Duration
}
//check item is expire
func (mi *RuntimeItem) isExpire() bool {
// 0 means forever
if mi.ttl == 0 {
return false
}
return time.Now().Sub(mi.createTime) > mi.ttl
}
// RuntimeCache is runtime cache adapter.
// it contains a RW locker for safe map storage.
type RuntimeCache struct {
sync.RWMutex
gcInterval time.Duration
items *sync.Map
//items map[string]*RuntimeItem
}
// NewRuntimeCache returns a new *RuntimeCache.
func NewRuntimeCache() *RuntimeCache {
cache := RuntimeCache{items:new(sync.Map),gcInterval: DefaultGCInterval}
go cache.gc()
return &cache
}
// Get cache from runtime cache.
// if non-existed or expired, return nil.
func (ca *RuntimeCache) Get(key string) (interface{}, error) {
ca.RLock()
defer ca.RUnlock()
if itemObj, ok := ca.items.Load(key); ok {
item := itemObj.(*RuntimeItem)
if item.isExpire() {
return nil, nil
}
return item.value, nil
}
return nil, nil
}
// returns value string format by given key
// if non-existed or expired, return "".
func (ca *RuntimeCache) GetString(key string) (string, error) {
v, err := ca.Get(key)
if err != nil || v == nil {
return "", err
} else {
return fmt.Sprint(v), nil
}
}
// returns value int format by given key
// if non-existed or expired, return 0.
func (ca *RuntimeCache) GetInt(key string) (int, error) {
v, err := ca.GetString(key)
if err != nil || v == "" {
return 0, err
} else {
i, e := strconv.Atoi(v)
if e != nil {
return 0, e
} else {
return i, nil
}
}
}
// returns value int64 format by given key
// if non-existed or expired, return 0.
func (ca *RuntimeCache) GetInt64(key string) (int64, error) {
v, err := ca.GetString(key)
if err != nil || v == "" {
return ZeroInt64, nil
} else {
i, e := strconv.ParseInt(v, 10, 64)
if e != nil {
return ZeroInt64, e
} else {
return i, nil
}
}
}
// Set cache to runtime.
// ttl is second, if ttl is 0, it will be forever till restart.
func (ca *RuntimeCache) Set(key string, value interface{}, ttl int64) error {
ca.Lock()
defer ca.Unlock()
ca.initValue(key, value, ttl)
return nil
}
func (ca *RuntimeCache) initValue(key string, value interface{}, ttl int64) error {
ca.items.Store(key, &RuntimeItem{
value: value,
createTime: time.Now(),
ttl: time.Duration(ttl) * time.Second,
})
return nil
}
// Incr increase int64 counter in runtime cache.
func (ca *RuntimeCache) Incr(key string) (int64, error) {
ca.Lock()
itemObj, ok := ca.items.Load(key)
if !ok {
//if not exists, auto set new with 0
ca.initValue(key, ZeroInt64, 0)
//reload
itemObj, _ = ca.items.Load(key)
}
item := itemObj.(*RuntimeItem)
switch item.value.(type) {
case int:
item.value = item.value.(int) + 1
case int32:
item.value = item.value.(int32) + 1
case int64:
item.value = item.value.(int64) + 1
case uint:
item.value = item.value.(uint) + 1
case uint32:
item.value = item.value.(uint32) + 1
case uint64:
item.value = item.value.(uint64) + 1
default:
return 0, errors.New("item val is not (u)int (u)int32 (u)int64")
}
ca.Unlock()
val, _ := strconv.ParseInt(fmt.Sprint(item.value), 10, 64)
return val, nil
}
// Decr decrease counter in runtime cache.
func (ca *RuntimeCache) Decr(key string) (int64, error) {
ca.Lock()
itemObj, ok := ca.items.Load(key)
if !ok {
//if not exists, auto set new with 0
ca.initValue(key, ZeroInt64, 0)
//reload
itemObj, _ = ca.items.Load(key)
}
item := itemObj.(*RuntimeItem)
switch item.value.(type) {
case int:
item.value = item.value.(int) - 1
case int64:
item.value = item.value.(int64) - 1
case int32:
item.value = item.value.(int32) - 1
case uint:
if item.value.(uint) > 0 {
item.value = item.value.(uint) - 1
} else {
return 0, errors.New("item val is less than 0")
}
case uint32:
if item.value.(uint32) > 0 {
item.value = item.value.(uint32) - 1
} else {
return 0, errors.New("item val is less than 0")
}
case uint64:
if item.value.(uint64) > 0 {
item.value = item.value.(uint64) - 1
} else {
return 0, errors.New("item val is less than 0")
}
default:
return 0, errors.New("item val is not int int64 int32")
}
ca.Unlock()
val, _ := strconv.ParseInt(fmt.Sprint(item.value), 10, 64)
return val, nil
}
// Exist check item exist in runtime cache.
func (ca *RuntimeCache) Exists(key string) (bool, error) {
ca.RLock()
defer ca.RUnlock()
if itemObj, ok := ca.items.Load(key); ok {
item := itemObj.(*RuntimeItem)
return !item.isExpire(), nil
}
return false, nil
}
// Delete item in runtime cacha.
// if not exists, we think it's success
func (ca *RuntimeCache) Delete(key string) error {
ca.Lock()
defer ca.Unlock()
if _, ok := ca.items.Load(key); !ok {
//if not exists, we think it's success
return nil
}
ca.items.Delete(key)
if _, ok := ca.items.Load(key); ok {
return errors.New("delete key error")
}
return nil
}
// ClearAll will delete all item in runtime cache.
func (ca *RuntimeCache) ClearAll() error {
ca.Lock()
defer ca.Unlock()
ca.items = nil
return nil
}
func (ca *RuntimeCache) gc() {
for {
<-time.After(ca.gcInterval)
if ca.items == nil {
return
}
ca.items.Range(func(key interface{}, v interface{}) bool{
ca.itemExpired(fmt.Sprint(key))
return true
})
}
}
// itemExpired returns true if an item is expired.
func (ca *RuntimeCache) itemExpired(name string) bool {
ca.Lock()
defer ca.Unlock()
itemObj, ok := ca.items.Load(name)
if !ok {
return true
}
item := itemObj.(*RuntimeItem)
if item.isExpire() {
ca.items.Delete(name)
return true
}
return false
}