forked from TrueCloudLab/frostfs-s3-gw
104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
package cache
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import (
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"fmt"
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"strings"
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"time"
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"github.com/bluele/gcache"
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cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
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"github.com/nspcc-dev/neofs-api-go/pkg/object"
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)
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/*
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This is an implementation of a cache which keeps unsorted lists of objects' IDs (all versions)
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for a specified bucket and a prefix.
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The cache contains gcache whose entries have a key: ObjectsListKey struct and a value: list of ids.
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After putting a record it lives for a while (default value is 60 seconds).
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When we receive a request from the user we try to find the suitable and non-expired cache entry, go through the list
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and get ObjectInfos from common object cache or with a request to NeoFS.
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When we put an object into a container we invalidate entries with prefixes that are prefixes of the object's name.
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*/
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type (
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// ObjectsListCache contains cache for ListObjects and ListObjectVersions.
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ObjectsListCache struct {
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cache gcache.Cache
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}
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// ObjectsListKey is a key to find a ObjectsListCache's entry.
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ObjectsListKey struct {
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cid string
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prefix string
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}
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)
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const (
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// DefaultObjectsListCacheLifetime is a default lifetime of entries in cache of ListObjects.
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DefaultObjectsListCacheLifetime = time.Second * 60
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// DefaultObjectsListCacheSize is a default size of cache of ListObjects.
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DefaultObjectsListCacheSize = 1e5
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)
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// DefaultObjectsListConfig return new default cache expiration values.
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func DefaultObjectsListConfig() *Config {
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return &Config{Size: DefaultObjectsListCacheSize, Lifetime: DefaultObjectsListCacheLifetime}
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}
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// NewObjectsListCache is a constructor which creates an object of ListObjectsCache with given lifetime of entries.
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func NewObjectsListCache(config *Config) *ObjectsListCache {
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gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
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return &ObjectsListCache{cache: gc}
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}
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// Get return list of ObjectInfo.
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func (l *ObjectsListCache) Get(key ObjectsListKey) []*object.ID {
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entry, err := l.cache.Get(key)
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if err != nil {
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return nil
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}
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result, ok := entry.([]*object.ID)
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if !ok {
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return nil
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}
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return result
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}
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// Put puts a list of objects to cache.
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func (l *ObjectsListCache) Put(key ObjectsListKey, oids []*object.ID) error {
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if len(oids) == 0 {
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return fmt.Errorf("list is empty, cid: %s, prefix: %s", key.cid, key.prefix)
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}
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return l.cache.Set(key, oids)
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}
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// CleanCacheEntriesContainingObject deletes entries containing specified object.
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func (l *ObjectsListCache) CleanCacheEntriesContainingObject(objectName string, cid *cid.ID) {
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cidStr := cid.String()
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keys := l.cache.Keys(true)
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for _, key := range keys {
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k, ok := key.(ObjectsListKey)
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if !ok {
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continue
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}
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if cidStr == k.cid && strings.HasPrefix(objectName, k.prefix) {
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l.cache.Remove(k)
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}
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}
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}
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// CreateObjectsListCacheKey returns ObjectsListKey with given CID and prefix.
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func CreateObjectsListCacheKey(cid *cid.ID, prefix string) ObjectsListKey {
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p := ObjectsListKey{
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cid: cid.String(),
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prefix: prefix,
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}
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return p
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}
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