frostfs-s3-gw/api/cache/objectslist.go

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