70 lines
2 KiB
Go
70 lines
2 KiB
Go
|
package placement
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/sha256"
|
||
|
|
"fmt"
|
||
|
|
"sync"
|
||
|
|
|
||
|
|
cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
|
||
|
|
netmapSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
|
||
|
|
"github.com/hashicorp/golang-lru/v2/simplelru"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ContainerNodesCache caches results of ContainerNodes() invocation between epochs.
|
||
|
|
type ContainerNodesCache struct {
|
||
|
|
// mtx protects lastEpoch and containerCache fields.
|
||
|
|
mtx sync.Mutex
|
||
|
|
// lastEpoch contains network map epoch for all values in the container cache.
|
||
|
|
lastEpoch uint64
|
||
|
|
// containerCache caches container nodes by ID. It is used to skip `GetContainerNodes` invocation if
|
||
|
|
// neither netmap nor container has changed.
|
||
|
|
containerCache simplelru.LRUCache[cid.ID, [][]netmapSDK.NodeInfo]
|
||
|
|
}
|
||
|
|
|
||
|
|
// defaultContainerCacheSize is the default size for the container cache.
|
||
|
|
const defaultContainerCacheSize = 10
|
||
|
|
|
||
|
|
// NewContainerNodesCache creates new cache which saves the result of the ContainerNodes() invocations.
|
||
|
|
// If size is <= 0, defaultContainerCacheSize (10) is used.
|
||
|
|
func NewContainerNodesCache(size int) *ContainerNodesCache {
|
||
|
|
if size <= 0 {
|
||
|
|
size = defaultContainerCacheSize
|
||
|
|
}
|
||
|
|
|
||
|
|
cache, _ := simplelru.NewLRU[cid.ID, [][]netmapSDK.NodeInfo](size, nil) // no error
|
||
|
|
return &ContainerNodesCache{
|
||
|
|
containerCache: cache,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// ContainerNodes returns the result of nm.ContainerNodes(), possibly from the cache.
|
||
|
|
func (c *ContainerNodesCache) ContainerNodes(nm *netmapSDK.NetMap, cnr cid.ID, p netmapSDK.PlacementPolicy) ([][]netmapSDK.NodeInfo, error) {
|
||
|
|
c.mtx.Lock()
|
||
|
|
if nm.Epoch() == c.lastEpoch {
|
||
|
|
raw, ok := c.containerCache.Get(cnr)
|
||
|
|
c.mtx.Unlock()
|
||
|
|
if ok {
|
||
|
|
return raw, nil
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
c.lastEpoch = nm.Epoch()
|
||
|
|
c.containerCache.Purge()
|
||
|
|
c.mtx.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
binCnr := make([]byte, sha256.Size)
|
||
|
|
cnr.Encode(binCnr)
|
||
|
|
|
||
|
|
cn, err := nm.ContainerNodes(p, binCnr)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("could not get container nodes: %w", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
c.mtx.Lock()
|
||
|
|
if c.lastEpoch == nm.Epoch() {
|
||
|
|
c.containerCache.Add(cnr, cn)
|
||
|
|
}
|
||
|
|
c.mtx.Unlock()
|
||
|
|
return cn, nil
|
||
|
|
}
|