/
ristretto.go
139 lines (113 loc) · 3.14 KB
/
ristretto.go
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package store
import (
"errors"
"fmt"
"strings"
time "time"
)
const (
// RistrettoType represents the storage type as a string value
RistrettoType = "ristretto"
// RistrettoTagPattern represents the tag pattern to be used as a key in specified storage
RistrettoTagPattern = "gocache_tag_%s"
)
// RistrettoClientInterface represents a dgraph-io/ristretto client
type RistrettoClientInterface interface {
Get(key interface{}) (interface{}, bool)
Set(key, value interface{}, cost int64) bool
Del(key interface{})
}
// RistrettoStore is a store for Ristretto (memory) library
type RistrettoStore struct {
client RistrettoClientInterface
options *Options
}
// NewRistretto creates a new store to Ristretto (memory) library instance
func NewRistretto(client RistrettoClientInterface, options *Options) *RistrettoStore {
if options == nil {
options = &Options{}
}
return &RistrettoStore{
client: client,
options: options,
}
}
// Get returns data stored from a given key
func (s *RistrettoStore) Get(key interface{}) (interface{}, error) {
var err error
value, exists := s.client.Get(key)
if !exists {
err = errors.New("Value not found in Ristretto store")
}
return value, err
}
// Set defines data in Ristretto memoey cache for given key identifier
func (s *RistrettoStore) Set(key interface{}, value interface{}, options *Options) error {
var err error
if options == nil {
options = s.options
}
if set := s.client.Set(key, value, options.CostValue()); !set {
err = fmt.Errorf("An error has occurred while setting value '%v' on key '%v'", value, key)
}
if err != nil {
return err
}
if tags := options.TagsValue(); len(tags) > 0 {
s.setTags(key, tags)
}
return nil
}
func (s *RistrettoStore) setTags(key interface{}, tags []string) {
for _, tag := range tags {
var tagKey = fmt.Sprintf(RistrettoTagPattern, tag)
var cacheKeys = []string{}
if result, err := s.Get(tagKey); err == nil {
if bytes, ok := result.([]byte); ok {
cacheKeys = strings.Split(string(bytes), ",")
}
}
var alreadyInserted = false
for _, cacheKey := range cacheKeys {
if cacheKey == key.(string) {
alreadyInserted = true
break
}
}
if !alreadyInserted {
cacheKeys = append(cacheKeys, key.(string))
}
s.Set(tagKey, []byte(strings.Join(cacheKeys, ",")), &Options{
Expiration: 720 * time.Hour,
})
}
}
// Delete removes data in Ristretto memoey cache for given key identifier
func (s *RistrettoStore) Delete(key interface{}) error {
s.client.Del(key)
return nil
}
// Invalidate invalidates some cache data in Redis for given options
func (s *RistrettoStore) Invalidate(options InvalidateOptions) error {
if tags := options.TagsValue(); len(tags) > 0 {
for _, tag := range tags {
var tagKey = fmt.Sprintf(RistrettoTagPattern, tag)
result, err := s.Get(tagKey)
if err != nil {
return nil
}
var cacheKeys = []string{}
if bytes, ok := result.([]byte); ok {
cacheKeys = strings.Split(string(bytes), ",")
}
for _, cacheKey := range cacheKeys {
s.Delete(cacheKey)
}
}
}
return nil
}
// GetType returns the store type
func (s *RistrettoStore) GetType() string {
return RistrettoType
}