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add support for defining TTL for image credentials cache
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,27 @@ | ||
package cache | ||
|
||
import ( | ||
"context" | ||
"time" | ||
|
||
"github.com/pkg/errors" | ||
) | ||
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var ( | ||
ErrNotFound = errors.New("item not found") | ||
) | ||
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type Cache[T any] interface { | ||
// Get retrieves the cached value for the given key. | ||
// If the key is not found, it returns ErrNotFound if the item is not found or ttl is expired. | ||
Get(ctx context.Context, key string) (T, error) | ||
// Set stores the value in the cache with the given key. | ||
// If ttl is 0, the item will be cached indefinitely. | ||
Set(ctx context.Context, key string, value T, ttl time.Duration) error | ||
} | ||
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// IsCacheMiss returns true if the error is a cache miss error. | ||
// This is a helper function to determine so users don't have to compare errors manually. | ||
func IsCacheMiss(err error) bool { | ||
return errors.Is(err, ErrNotFound) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,68 @@ | ||
package cache | ||
|
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import ( | ||
"context" | ||
"sync" | ||
"time" | ||
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"github.com/pkg/errors" | ||
) | ||
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type item[T any] struct { | ||
value T | ||
expiresAt *time.Time | ||
} | ||
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// timeGetter is a function that returns the current time. | ||
type timeGetter func() time.Time | ||
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type InMemoryCache[T any] struct { | ||
cache sync.Map | ||
timeGetter timeGetter | ||
} | ||
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// NewInMemoryCache creates a new in-memory cache. | ||
// The underlying cache implementation uses a sync.Map so it is thread-safe. | ||
func NewInMemoryCache[T any]() *InMemoryCache[T] { | ||
return &InMemoryCache[T]{ | ||
timeGetter: time.Now, | ||
} | ||
} | ||
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func (c *InMemoryCache[T]) Get(ctx context.Context, key string) (T, error) { | ||
var defaultVal T | ||
rawItem, ok := c.cache.Load(key) | ||
if !ok { | ||
return defaultVal, ErrNotFound | ||
} | ||
i, ok := rawItem.(*item[T]) | ||
if !ok { | ||
return defaultVal, errors.New("unexpected item type found in cache") | ||
} | ||
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if i.expiresAt != nil && i.expiresAt.Before(time.Now()) { | ||
c.cache.Delete(key) | ||
return defaultVal, ErrNotFound | ||
} | ||
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return i.value, nil | ||
} | ||
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func (c *InMemoryCache[T]) Set(ctx context.Context, key string, value T, ttl time.Duration) error { | ||
if ttl < 0 { | ||
return errors.New("ttl must be greater than 0") | ||
} | ||
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i := &item[T]{ | ||
value: value, | ||
} | ||
if ttl > 0 { | ||
expiresAt := c.timeGetter().Add(ttl) | ||
i.expiresAt = &expiresAt | ||
} | ||
c.cache.Store(key, i) | ||
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return nil | ||
} | ||
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var _ Cache[any] = &InMemoryCache[any]{} |
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