forked from TrueCloudLab/frostfs-sdk-go
72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
package pool
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import (
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"strings"
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"sync/atomic"
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"github.com/TrueCloudLab/frostfs-sdk-go/session"
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lru "github.com/hashicorp/golang-lru"
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)
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type sessionCache struct {
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cache *lru.Cache
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currentEpoch uint64
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}
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type cacheValue struct {
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token session.Object
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}
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func newCache() (*sessionCache, error) {
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cache, err := lru.New(100)
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if err != nil {
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return nil, err
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}
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return &sessionCache{cache: cache}, nil
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}
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// Get returns a copy of the session token from the cache without signature
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// and context related fields. Returns nil if token is missing in the cache.
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// It is safe to modify and re-sign returned session token.
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func (c *sessionCache) Get(key string) (session.Object, bool) {
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valueRaw, ok := c.cache.Get(key)
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if !ok {
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return session.Object{}, false
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}
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value := valueRaw.(*cacheValue)
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if c.expired(value) {
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c.cache.Remove(key)
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return session.Object{}, false
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}
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return value.token, true
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}
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func (c *sessionCache) Put(key string, token session.Object) bool {
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return c.cache.Add(key, &cacheValue{
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token: token,
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})
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}
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func (c *sessionCache) DeleteByPrefix(prefix string) {
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for _, key := range c.cache.Keys() {
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if strings.HasPrefix(key.(string), prefix) {
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c.cache.Remove(key)
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}
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}
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}
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func (c *sessionCache) updateEpoch(newEpoch uint64) {
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epoch := atomic.LoadUint64(&c.currentEpoch)
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if newEpoch > epoch {
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atomic.StoreUint64(&c.currentEpoch, newEpoch)
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}
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}
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func (c *sessionCache) expired(val *cacheValue) bool {
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epoch := atomic.LoadUint64(&c.currentEpoch)
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// use epoch+1 (clear cache beforehand) to prevent 'expired session token' error right after epoch tick
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return val.token.ExpiredAt(epoch + 1)
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}
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