package main import ( "sync" "time" lru "github.com/hashicorp/golang-lru" eaclSDK "github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl" containerSDK "github.com/nspcc-dev/neofs-api-go/pkg/container" netmapSDK "github.com/nspcc-dev/neofs-api-go/pkg/netmap" "github.com/nspcc-dev/neofs-node/pkg/core/container" "github.com/nspcc-dev/neofs-node/pkg/core/netmap" "github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl" ) type netValueReader func(interface{}) (interface{}, error) type valueWithTime struct { v interface{} t time.Time } // entity that provides TTL cache interface. type ttlNetCache struct { mtx sync.Mutex ttl time.Duration sz int cache *lru.Cache netRdr netValueReader } // complicates netValueReader with TTL caching mechanism. func newNetworkTTLCache(sz int, ttl time.Duration, netRdr netValueReader) *ttlNetCache { cache, err := lru.New(sz) fatalOnErr(err) return &ttlNetCache{ ttl: ttl, sz: sz, cache: cache, netRdr: netRdr, } } // reads value by the key. // // updates the value from the network on cache miss or by TTL. // // returned value should not be modified. func (c *ttlNetCache) get(key interface{}) (interface{}, error) { c.mtx.Lock() defer c.mtx.Unlock() val, ok := c.cache.Peek(key) if ok { valWithTime := val.(*valueWithTime) if time.Since(valWithTime.t) < c.ttl { return valWithTime.v, nil } c.cache.Remove(key) } val, err := c.netRdr(key) if err != nil { return nil, err } c.cache.Add(key, &valueWithTime{ v: val, t: time.Now(), }) return val, nil } // entity that provides LRU cache interface. type lruNetCache struct { mtx sync.Mutex cache *lru.Cache netRdr netValueReader } // complicates netValueReader with LRU caching mechanism. func newNetworkLRUCache(sz int, netRdr netValueReader) *lruNetCache { cache, err := lru.New(sz) fatalOnErr(err) return &lruNetCache{ cache: cache, netRdr: netRdr, } } // reads value by the key. // // updates the value from the network on cache miss. // // returned value should not be modified. func (c *lruNetCache) get(key interface{}) (interface{}, error) { c.mtx.Lock() defer c.mtx.Unlock() val, ok := c.cache.Get(key) if ok { return val, nil } val, err := c.netRdr(key) if err != nil { return nil, err } c.cache.Add(key, val) return val, nil } // wrapper over TTL cache of values read from the network // that implements container storage. type ttlContainerStorage ttlNetCache func newCachedContainerStorage(v container.Source) container.Source { const ( containerCacheSize = 100 containerCacheTTL = 30 * time.Second ) lruCnrCache := newNetworkTTLCache(containerCacheSize, containerCacheTTL, func(key interface{}) (interface{}, error) { cid := containerSDK.NewID() err := cid.Parse(key.(string)) if err != nil { return nil, err } return v.Get(cid) }) return (*ttlContainerStorage)(lruCnrCache) } func (s *ttlContainerStorage) Get(cid *containerSDK.ID) (*containerSDK.Container, error) { val, err := (*ttlNetCache)(s).get(cid.String()) if err != nil { return nil, err } return val.(*containerSDK.Container), nil } type ttlEACLStorage ttlNetCache func newCachedEACLStorage(v eacl.Storage) eacl.Storage { const ( eaclCacheSize = 100 eaclCacheTTL = 30 * time.Second ) lruCnrCache := newNetworkTTLCache(eaclCacheSize, eaclCacheTTL, func(key interface{}) (interface{}, error) { cid := containerSDK.NewID() err := cid.Parse(key.(string)) if err != nil { return nil, err } return v.GetEACL(cid) }) return (*ttlEACLStorage)(lruCnrCache) } func (s *ttlEACLStorage) GetEACL(cid *containerSDK.ID) (*eaclSDK.Table, error) { val, err := (*ttlNetCache)(s).get(cid.String()) if err != nil { return nil, err } return val.(*eaclSDK.Table), nil } type lruNetmapSource struct { netState netmap.State cache *lruNetCache } func newCachedNetmapStorage(s netmap.State, v netmap.Source) netmap.Source { const netmapCacheSize = 10 lruNetmapCache := newNetworkLRUCache(netmapCacheSize, func(key interface{}) (interface{}, error) { return v.GetNetMapByEpoch(key.(uint64)) }) return &lruNetmapSource{ netState: s, cache: lruNetmapCache, } } func (s *lruNetmapSource) GetNetMap(diff uint64) (*netmapSDK.Netmap, error) { return s.getNetMapByEpoch(s.netState.CurrentEpoch() - diff) } func (s *lruNetmapSource) GetNetMapByEpoch(epoch uint64) (*netmapSDK.Netmap, error) { return s.getNetMapByEpoch(epoch) } func (s *lruNetmapSource) getNetMapByEpoch(epoch uint64) (*netmapSDK.Netmap, error) { val, err := s.cache.get(epoch) if err != nil { return nil, err } return val.(*netmapSDK.Netmap), nil } func (s *lruNetmapSource) Epoch() (uint64, error) { return s.netState.CurrentEpoch(), nil }