43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
package common
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import (
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"log"
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"time"
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cache "github.com/patrickmn/go-cache"
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)
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// LoadingCache defines interface for caching
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type LoadingCache interface {
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Get(key string, ttl time.Duration, fn func() ([]byte, error)) (data []byte, err error)
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Flush()
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}
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// loadingCache implements LoadingCache interface on top of cache.Cache
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type loadingCache struct {
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bytesCache *cache.Cache
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}
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// NewLoadingCache makes loadingCache implementation
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func NewLoadingCache(defaultExpiration, cleanupInterval time.Duration) LoadingCache {
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return &loadingCache{bytesCache: cache.New(defaultExpiration, cleanupInterval)}
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}
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func (lc *loadingCache) Get(key string, ttl time.Duration, fn func() ([]byte, error)) (data []byte, err error) {
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if b, ok := lc.bytesCache.Get(key); ok {
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log.Printf("[DEBUG] cache hit %s", key)
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return b.([]byte), nil
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}
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log.Printf("[DEBUG] cache miss %s", key)
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if data, err = fn(); err != nil {
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return data, err
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}
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lc.bytesCache.Set(key, data, ttl)
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return data, nil
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}
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func (lc *loadingCache) Flush() {
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lc.bytesCache.Flush()
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}
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