frostfs-node/pkg/local_object_storage/writecache/state.go

104 lines
2 KiB
Go
Raw Normal View History

package writecache
import (
"fmt"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/fstree"
"go.etcd.io/bbolt"
"go.uber.org/atomic"
)
// ObjectCounters is an interface of the storage of cached object amount.
type ObjectCounters interface {
// Increments number of objects saved in DB.
IncDB()
// Decrements number of objects saved in DB.
DecDB()
// Returns number of objects saved in DB.
DB() uint64
// Increments number of objects saved in FSTree.
IncFS()
// Decrements number of objects saved in FSTree.
DecFS()
// Returns number of objects saved in FSTree.
FS() uint64
// Reads number of objects saved in write-cache. It is called on write-cache initialization step.
Read() error
// Flushes the values and closes the storage. It is called on write-cache shutdown.
FlushAndClose()
}
func (c *cache) estimateCacheSize() uint64 {
return c.objCounters.DB()*c.smallObjectSize + c.objCounters.FS()*c.maxObjectSize
}
func (c *cache) incSizeDB(sz uint64) uint64 {
return sz + c.smallObjectSize
}
func (c *cache) incSizeFS(sz uint64) uint64 {
return sz + c.maxObjectSize
}
type counters struct {
cDB, cFS atomic.Uint64
db *bbolt.DB
fs *fstree.FSTree
}
func (x *counters) IncDB() {
x.cDB.Inc()
}
func (x *counters) DecDB() {
x.cDB.Dec()
}
func (x *counters) DB() uint64 {
return x.cDB.Load()
}
func (x *counters) IncFS() {
x.cFS.Inc()
}
func (x *counters) DecFS() {
x.cFS.Dec()
}
func (x *counters) FS() uint64 {
return x.cFS.Load()
}
func (x *counters) Read() error {
var inDB uint64
err := x.db.View(func(tx *bbolt.Tx) error {
b := tx.Bucket(defaultBucket)
if b != nil {
inDB = uint64(b.Stats().KeyN)
}
return nil
})
if err != nil {
return fmt.Errorf("could not read write-cache DB counter: %w", err)
}
x.cDB.Store(inDB)
// FIXME: calculate the actual value in FSTree (new method?).
// For now we can think that db/fs = 50/50.
x.cFS.Store(inDB)
return nil
}
func (x *counters) FlushAndClose() {
// values aren't stored
}