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