frostfs-node/pkg/innerring/processors/netmap/cleanup_table.go

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package netmap
import (
"encoding/hex"
"sync"
"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
)
type (
cleanupTable struct {
*sync.RWMutex
enabled bool
threshold uint64
lastAccess map[string]epochStamp
}
epochStamp struct {
epoch uint64
removeFlag bool
}
)
func newCleanupTable(enabled bool, threshold uint64) cleanupTable {
return cleanupTable{
RWMutex: new(sync.RWMutex),
enabled: enabled,
threshold: threshold,
lastAccess: make(map[string]epochStamp),
}
}
// Update cleanup table based on on-chain information about netmap.
func (c *cleanupTable) update(snapshot *netmap.Netmap, now uint64) {
c.Lock()
defer c.Unlock()
// replacing map is less memory efficient but faster
newMap := make(map[string]epochStamp, len(snapshot.Nodes))
for i := range snapshot.Nodes {
keyString := hex.EncodeToString(snapshot.Nodes[i].PublicKey())
if access, ok := c.lastAccess[keyString]; ok {
access.removeFlag = false // reset remove Flag on each Update
newMap[keyString] = access
} else {
newMap[keyString] = epochStamp{epoch: now}
}
}
c.lastAccess = newMap
}
func (c *cleanupTable) touch(keyString string, now uint64) bool {
c.Lock()
defer c.Unlock()
access, ok := c.lastAccess[keyString]
result := !access.removeFlag && ok
access.removeFlag = false // reset remove flag on each touch
if now > access.epoch {
access.epoch = now
}
c.lastAccess[keyString] = access
return result
}
func (c *cleanupTable) flag(keyString string) {
c.Lock()
defer c.Unlock()
if access, ok := c.lastAccess[keyString]; ok {
access.removeFlag = true
c.lastAccess[keyString] = access
}
}
func (c *cleanupTable) forEachRemoveCandidate(epoch uint64, f func(string) error) error {
c.Lock()
defer c.Unlock()
for keyString, access := range c.lastAccess {
if epoch-access.epoch > c.threshold {
access.removeFlag = true // set remove flag
c.lastAccess[keyString] = access
if err := f(keyString); err != nil {
return err
}
}
}
return nil
}