71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
package pool
|
|
|
|
import (
|
|
"strings"
|
|
"sync/atomic"
|
|
|
|
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
|
|
lru "github.com/hashicorp/golang-lru/v2"
|
|
)
|
|
|
|
type sessionCache struct {
|
|
cache *lru.Cache[string, *cacheValue]
|
|
currentEpoch atomic.Uint64
|
|
}
|
|
|
|
type cacheValue struct {
|
|
token session.Object
|
|
}
|
|
|
|
func newCache() (*sessionCache, error) {
|
|
cache, err := lru.New[string, *cacheValue](100)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &sessionCache{cache: cache}, nil
|
|
}
|
|
|
|
// Get returns a copy of the session token from the cache without signature
|
|
// and context related fields. Returns nil if token is missing in the cache.
|
|
// It is safe to modify and re-sign returned session token.
|
|
func (c *sessionCache) Get(key string) (session.Object, bool) {
|
|
value, ok := c.cache.Get(key)
|
|
if !ok {
|
|
return session.Object{}, false
|
|
}
|
|
|
|
if c.expired(value) {
|
|
c.cache.Remove(key)
|
|
return session.Object{}, false
|
|
}
|
|
|
|
return value.token, true
|
|
}
|
|
|
|
func (c *sessionCache) Put(key string, token session.Object) bool {
|
|
return c.cache.Add(key, &cacheValue{
|
|
token: token,
|
|
})
|
|
}
|
|
|
|
func (c *sessionCache) DeleteByPrefix(prefix string) {
|
|
for _, key := range c.cache.Keys() {
|
|
if strings.HasPrefix(key, prefix) {
|
|
c.cache.Remove(key)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *sessionCache) updateEpoch(newEpoch uint64) {
|
|
epoch := c.currentEpoch.Load()
|
|
if newEpoch > epoch {
|
|
c.currentEpoch.Store(newEpoch)
|
|
}
|
|
}
|
|
|
|
func (c *sessionCache) expired(val *cacheValue) bool {
|
|
epoch := c.currentEpoch.Load()
|
|
// use epoch+1 (clear cache beforehand) to prevent 'expired session token' error right after epoch tick
|
|
return val.token.ExpiredAt(epoch + 1)
|
|
}
|