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66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
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package cache
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import (
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"context"
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"errors"
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"time"
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)
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var (
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// DefaultCache is the default cache.
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DefaultCache Cache = NewCache()
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// DefaultExpiration is the default duration for items stored in
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// the cache to expire.
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DefaultExpiration time.Duration = 0
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// ErrItemExpired is returned in Cache.Get when the item found in the cache
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// has expired.
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ErrItemExpired error = errors.New("item has expired")
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// ErrKeyNotFound is returned in Cache.Get and Cache.Delete when the
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// provided key could not be found in cache.
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ErrKeyNotFound error = errors.New("key not found in cache")
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)
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// Cache is the interface that wraps the cache.
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//
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// Context specifies the context for the cache.
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// Get gets a cached value by key.
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// Put stores a key-value pair into cache.
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// Delete removes a key from cache.
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type Cache interface {
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Context(ctx context.Context) Cache
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Get(key string) (interface{}, time.Time, error)
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Put(key string, val interface{}, d time.Duration) error
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Delete(key string) error
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}
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// Item represents an item stored in the cache.
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type Item struct {
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Value interface{}
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Expiration int64
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}
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// Expired returns true if the item has expired.
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func (i *Item) Expired() bool {
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if i.Expiration == 0 {
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return false
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}
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return time.Now().UnixNano() > i.Expiration
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}
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// NewCache returns a new cache.
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func NewCache(opts ...Option) Cache {
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options := NewOptions(opts...)
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items := make(map[string]Item)
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if len(options.Items) > 0 {
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items = options.Items
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}
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return &memCache{
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opts: options,
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items: items,
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}
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}
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