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local_cache.go
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157 lines (139 loc) · 2.99 KB
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package cache
import (
"context"
"errors"
"fmt"
"sync"
"time"
)
var (
errKeyNotFound = errors.New("cache：键不存在")
//errKeyExpired = errors.New("cache：键过期")
)
type MapCacheOption func(cache *MapCache)
type MapCache struct {
data map[string]*item
//data sync.Map
mutex sync.RWMutex
close chan struct{}
// 删除回调方法
onEvicted func(key string, val any)
//onEvicted func(ctx context.Context, key string, val any)
//onEvicteds []func(key string, val any)
}
func NewMapCache(interval time.Duration, opts ...MapCacheOption) *MapCache {
res := &MapCache{
data: make(map[string]*item, 100),
close: make(chan struct{}),
onEvicted: func(key string, val any) {},
}
for _, opt := range opts {
opt(res)
}
go func() {
ticker := time.NewTicker(interval)
for {
// 定时检测批量数据, 删除过期 K-V
select {
case t := <-ticker.C:
res.mutex.Lock()
i := 0
for key, val := range res.data {
if i > 10000 {
break
}
if val.deadlineBefore(t) {
res.delete(key)
}
i++
}
res.mutex.Unlock()
case <-res.close:
return
}
}
}()
return res
}
func BuildInMapCacheWithEvictedCallback(fn func(key string, val any)) MapCacheOption {
return func(cache *MapCache) {
cache.onEvicted = fn
}
}
func (b *MapCache) Set(ctx context.Context, key string, val any, expiration time.Duration) error {
b.mutex.Lock()
defer b.mutex.Unlock()
return b.set(key, val, expiration)
}
func (b *MapCache) set(key string, val any, expiration time.Duration) error {
var dl time.Time
if expiration > 0 {
dl = time.Now().Add(expiration)
}
b.data[key] = &item{
val: val,
deadline: dl,
}
return nil
}
func (b *MapCache) Get(ctx context.Context, key string) (any, error) {
b.mutex.RLock()
res, ok := b.data[key]
b.mutex.RUnlock()
if !ok {
return nil, fmt.Errorf("%w, key: %s", errKeyNotFound, key)
}
now := time.Now()
if res.deadlineBefore(now) {
b.mutex.Lock()
defer b.mutex.Unlock()
res, ok = b.data[key]
if !ok {
return nil, fmt.Errorf("%w, key: %s", errKeyNotFound, key)
}
if res.deadlineBefore(now) {
b.delete(key)
return nil, fmt.Errorf("%w, key: %s", errKeyNotFound, key)
}
}
return res.val, nil
}
func (b *MapCache) Delete(ctx context.Context, key string) error {
b.mutex.Lock()
defer b.mutex.Unlock()
b.delete(key)
return nil
}
func (b *MapCache) LoadAndDelete(ctx context.Context, key string) (any, error) {
b.mutex.Lock()
defer b.mutex.Unlock()
val, ok := b.data[key]
if !ok {
return nil, errKeyNotFound
}
b.delete(key)
return val.val, nil
}
func (b *MapCache) delete(key string) {
itm, ok := b.data[key]
if !ok {
return
}
delete(b.data, key)
b.onEvicted(key, itm.val)
}
func (b *MapCache) Close() error {
select {
case b.close <- struct{}{}:
default:
return errors.New("重复关闭")
}
return nil
}
type item struct {
val any
deadline time.Time
}
func (i *item) deadlineBefore(t time.Time) bool {
return !i.deadline.IsZero() && i.deadline.Before(t)
}