94 lines
1.7 KiB
Go
94 lines
1.7 KiB
Go
package cache
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"github/fthvgb1/wp-go/safety"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
type SliceCache[T any] struct {
|
|
v safety.Var[slice[T]]
|
|
}
|
|
|
|
type slice[T any] struct {
|
|
data []T
|
|
mutex *sync.Mutex
|
|
setCacheFunc func(...any) ([]T, error)
|
|
expireTime time.Duration
|
|
setTime time.Time
|
|
incr int
|
|
}
|
|
|
|
func (c *SliceCache[T]) GetLastSetTime() time.Time {
|
|
return c.v.Load().setTime
|
|
}
|
|
|
|
func NewSliceCache[T any](fun func(...any) ([]T, error), duration time.Duration) *SliceCache[T] {
|
|
return &SliceCache[T]{
|
|
v: safety.NewVar(slice[T]{
|
|
mutex: &sync.Mutex{},
|
|
setCacheFunc: fun,
|
|
expireTime: duration,
|
|
}),
|
|
}
|
|
}
|
|
|
|
func (c *SliceCache[T]) FlushCache() {
|
|
mu := c.v.Load().mutex
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
c.v.Delete()
|
|
}
|
|
|
|
func (c *SliceCache[T]) GetCache(ctx context.Context, timeout time.Duration, params ...any) ([]T, error) {
|
|
v := c.v.Load()
|
|
l := len(v.data)
|
|
data := v.data
|
|
var err error
|
|
expired := time.Duration(v.setTime.UnixNano())+v.expireTime < time.Duration(time.Now().UnixNano())
|
|
if l < 1 || (l > 0 && v.expireTime >= 0 && expired) {
|
|
t := v.incr
|
|
call := func() {
|
|
v.mutex.Lock()
|
|
defer v.mutex.Unlock()
|
|
vv := c.v.Load()
|
|
if vv.incr > t {
|
|
return
|
|
}
|
|
r, er := vv.setCacheFunc(params...)
|
|
if err != nil {
|
|
err = er
|
|
return
|
|
}
|
|
vv.setTime = time.Now()
|
|
vv.data = r
|
|
data = r
|
|
vv.incr++
|
|
c.v.Store(vv)
|
|
}
|
|
if timeout > 0 {
|
|
ctx, cancel := context.WithTimeout(ctx, timeout)
|
|
defer cancel()
|
|
done := make(chan struct{}, 1)
|
|
go func() {
|
|
call()
|
|
done <- struct{}{}
|
|
close(done)
|
|
}()
|
|
select {
|
|
case <-ctx.Done():
|
|
err = errors.New(fmt.Sprintf("get cache %s", ctx.Err().Error()))
|
|
case <-done:
|
|
|
|
}
|
|
} else {
|
|
call()
|
|
}
|
|
|
|
}
|
|
return data, err
|
|
}
|