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go_cache.go
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go_cache.go
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package store
import (
"context"
"errors"
"fmt"
"sync"
"time"
)
const (
// GoCacheType represents the storage type as a string value
GoCacheType = "go-cache"
// GoCacheTagPattern represents the tag pattern to be used as a key in specified storage
GoCacheTagPattern = "gocache_tag_%s"
)
// GoCacheClientInterface represents a github.com/patrickmn/go-cache client
type GoCacheClientInterface interface {
Get(k string) (any, bool)
GetWithExpiration(k string) (any, time.Time, bool)
Set(k string, x any, d time.Duration)
Delete(k string)
Flush()
}
// GoCacheStore is a store for GoCache (memory) library
type GoCacheStore struct {
mu sync.RWMutex
client GoCacheClientInterface
options *Options
}
// NewGoCache creates a new store to GoCache (memory) library instance
func NewGoCache(client GoCacheClientInterface, options ...Option) *GoCacheStore {
return &GoCacheStore{
client: client,
options: applyOptions(options...),
}
}
// Get returns data stored from a given key
func (s *GoCacheStore) Get(_ context.Context, key any) (any, error) {
var err error
keyStr := key.(string)
value, exists := s.client.Get(keyStr)
if !exists {
err = NotFoundWithCause(errors.New("value not found in GoCache store"))
}
return value, err
}
// GetWithTTL returns data stored from a given key and its corresponding TTL
func (s *GoCacheStore) GetWithTTL(_ context.Context, key any) (any, time.Duration, error) {
data, t, exists := s.client.GetWithExpiration(key.(string))
if !exists {
return data, 0, NotFoundWithCause(errors.New("value not found in GoCache store"))
}
duration := time.Until(t)
return data, duration, nil
}
// Set defines data in GoCache memoey cache for given key identifier
func (s *GoCacheStore) Set(ctx context.Context, key any, value any, options ...Option) error {
opts := applyOptions(options...)
if opts == nil {
opts = s.options
}
s.client.Set(key.(string), value, opts.expiration)
if tags := opts.tags; len(tags) > 0 {
s.setTags(ctx, key, tags)
}
return nil
}
func (s *GoCacheStore) setTags(ctx context.Context, key any, tags []string) {
for _, tag := range tags {
tagKey := fmt.Sprintf(GoCacheTagPattern, tag)
var cacheKeys map[string]struct{}
if result, err := s.Get(ctx, tagKey); err == nil {
if bytes, ok := result.(map[string]struct{}); ok {
cacheKeys = bytes
}
}
s.mu.RLock()
if _, exists := cacheKeys[key.(string)]; exists {
s.mu.RUnlock()
continue
}
s.mu.RUnlock()
if cacheKeys == nil {
cacheKeys = make(map[string]struct{})
}
s.mu.Lock()
cacheKeys[key.(string)] = struct{}{}
s.mu.Unlock()
s.client.Set(tagKey, cacheKeys, 720*time.Hour)
}
}
// Delete removes data in GoCache memoey cache for given key identifier
func (s *GoCacheStore) Delete(_ context.Context, key any) error {
s.client.Delete(key.(string))
return nil
}
// Invalidate invalidates some cache data in GoCache memoey cache for given options
func (s *GoCacheStore) Invalidate(ctx context.Context, options ...InvalidateOption) error {
opts := applyInvalidateOptions(options...)
if tags := opts.tags; len(tags) > 0 {
for _, tag := range tags {
tagKey := fmt.Sprintf(GoCacheTagPattern, tag)
result, err := s.Get(ctx, tagKey)
if err != nil {
return nil
}
var cacheKeys map[string]struct{}
if bytes, ok := result.(map[string]struct{}); ok {
cacheKeys = bytes
}
s.mu.RLock()
for cacheKey := range cacheKeys {
_ = s.Delete(ctx, cacheKey)
}
s.mu.RUnlock()
}
}
return nil
}
// GetType returns the store type
func (s *GoCacheStore) GetType() string {
return GoCacheType
}
// Clear resets all data in the store
func (s *GoCacheStore) Clear(_ context.Context) error {
s.client.Flush()
return nil
}