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