frostfs-node/cmd/neofs-node/cache.go

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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"
cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
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) {
id := cid.New()
err := id.Parse(key.(string))
if err != nil {
return nil, err
}
return v.Get(id)
})
return (*ttlContainerStorage)(lruCnrCache)
}
func (s *ttlContainerStorage) Get(cid *cid.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.Source) eacl.Source {
const (
eaclCacheSize = 100
eaclCacheTTL = 30 * time.Second
)
lruCnrCache := newNetworkTTLCache(eaclCacheSize, eaclCacheTTL, func(key interface{}) (interface{}, error) {
id := cid.New()
err := id.Parse(key.(string))
if err != nil {
return nil, err
}
return v.GetEACL(id)
})
return (*ttlEACLStorage)(lruCnrCache)
}
func (s *ttlEACLStorage) GetEACL(cid *cid.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
}