79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
package layer
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import (
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"sync"
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"time"
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cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
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)
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/*
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This is an implementation of a cache for ListObjectsV2 which we return to users by ContinuationToken.
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The cache is a map which has a key: (access_key from AccessBox) + container_id and a value: list of objects with
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creation time. After putting a record we start a timer (via time.AfterFunc) that removes the record after
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defaultCacheLifetime value.
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ContinuationToken in our gateway is an objectID in NeoFS.
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We don't keep ContinuationToken in this structure because we assume that users who received the token can reconnect
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to other gateways and they should be able to get a list of objects.
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When we receive the token from the user we just try to find the cache and then we return the list of objects which
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starts from this token (i.e. objectID).
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*/
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// ObjectsListV2Cache provides interface for cache of ListObjectsV2 in a layer struct.
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type (
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ObjectsListV2Cache interface {
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Get(token string, key string) []*ObjectInfo
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Put(key string, objects []*ObjectInfo)
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}
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)
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var (
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defaultCacheLifetime = time.Second * 60
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)
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type (
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listObjectsCache struct {
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caches map[string]cache
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mtx sync.RWMutex
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}
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cache struct {
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list []*ObjectInfo
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}
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)
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func newListObjectsCache() *listObjectsCache {
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return &listObjectsCache{
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caches: make(map[string]cache),
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}
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}
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func (l *listObjectsCache) Get(token, key string) []*ObjectInfo {
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l.mtx.RLock()
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defer l.mtx.RUnlock()
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if val, ok := l.caches[key]; ok {
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return trimAfterObjectID(token, val.list)
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}
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return nil
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}
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func (l *listObjectsCache) Put(key string, objects []*ObjectInfo) {
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var c cache
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l.mtx.Lock()
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defer l.mtx.Unlock()
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c.list = objects
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l.caches[key] = c
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time.AfterFunc(defaultCacheLifetime, func() {
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l.mtx.Lock()
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delete(l.caches, key)
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l.mtx.Unlock()
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})
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}
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func createKey(accessKey string, cid *cid.ID) string {
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return accessKey + cid.String()
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}
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