frostfs-s3-gw/api/cache/policy.go
Denis Kirillov 9272f4e108 [] Support contract based policies
Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>
2023-12-11 10:01:46 +03:00

72 lines
2 KiB
Go

package cache
import (
"fmt"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
"github.com/bluele/gcache"
"go.uber.org/zap"
)
// MorphPolicyCache provides lru cache for listing policies stored in policy contract.
type MorphPolicyCache struct {
cache gcache.Cache
logger *zap.Logger
}
type MorphPolicyCacheKey struct {
Target engine.Target
Name chain.Name
}
const (
// DefaultMorphPolicyCacheSize is a default maximum number of entries in cache.
DefaultMorphPolicyCacheSize = 1e4
// DefaultMorphPolicyCacheLifetime is a default lifetime of entries in cache.
DefaultMorphPolicyCacheLifetime = time.Minute
)
// DefaultMorphPolicyConfig returns new default cache expiration values.
func DefaultMorphPolicyConfig(logger *zap.Logger) *Config {
return &Config{
Size: DefaultMorphPolicyCacheSize,
Lifetime: DefaultMorphPolicyCacheLifetime,
Logger: logger,
}
}
// NewMorphPolicyCache creates an object of MorphPolicyCache.
func NewMorphPolicyCache(config *Config) *MorphPolicyCache {
gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
return &MorphPolicyCache{cache: gc, logger: config.Logger}
}
// Get returns a cached object. Returns nil if value is missing.
func (o *MorphPolicyCache) Get(key MorphPolicyCacheKey) []*chain.Chain {
entry, err := o.cache.Get(key)
if err != nil {
return nil
}
result, ok := entry.([]*chain.Chain)
if !ok {
o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
zap.String("expected", fmt.Sprintf("%T", result)))
return nil
}
return result
}
// Put puts an object to cache.
func (o *MorphPolicyCache) Put(key MorphPolicyCacheKey, list []*chain.Chain) error {
return o.cache.Set(key, list)
}
// Delete deletes an object from cache.
func (o *MorphPolicyCache) Delete(key MorphPolicyCacheKey) bool {
return o.cache.Remove(key)
}