119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
package placement
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import (
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"crypto/sha256"
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"fmt"
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"sync"
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"github.com/TrueCloudLab/frostfs-node/pkg/core/netmap"
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cid "github.com/TrueCloudLab/frostfs-sdk-go/container/id"
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netmapSDK "github.com/TrueCloudLab/frostfs-sdk-go/netmap"
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oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id"
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"github.com/hashicorp/golang-lru/simplelru"
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)
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type netMapBuilder struct {
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nmSrc netmap.Source
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// mtx protects lastNm and containerCache fields.
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mtx sync.Mutex
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lastNm *netmapSDK.NetMap
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// containerCache caches container nodes by ID. It is used to skip `GetContainerNodes` invocation if
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// neither netmap nor container has changed.
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containerCache simplelru.LRUCache
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}
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type netMapSrc struct {
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netmap.Source
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nm *netmapSDK.NetMap
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}
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// defaultContainerCacheSize is the default size for the container cache.
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const defaultContainerCacheSize = 10
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func NewNetworkMapBuilder(nm *netmapSDK.NetMap) Builder {
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cache, _ := simplelru.NewLRU(defaultContainerCacheSize, nil) // no error
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return &netMapBuilder{
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nmSrc: &netMapSrc{nm: nm},
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containerCache: cache,
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}
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}
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func NewNetworkMapSourceBuilder(nmSrc netmap.Source) Builder {
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cache, _ := simplelru.NewLRU(defaultContainerCacheSize, nil) // no error
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return &netMapBuilder{
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nmSrc: nmSrc,
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containerCache: cache,
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}
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}
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func (s *netMapSrc) GetNetMap(diff uint64) (*netmapSDK.NetMap, error) {
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return s.nm, nil
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}
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func (b *netMapBuilder) BuildPlacement(cnr cid.ID, obj *oid.ID, p netmapSDK.PlacementPolicy) ([][]netmapSDK.NodeInfo, error) {
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nm, err := netmap.GetLatestNetworkMap(b.nmSrc)
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if err != nil {
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return nil, fmt.Errorf("could not get network map: %w", err)
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}
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binCnr := make([]byte, sha256.Size)
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cnr.Encode(binCnr)
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b.mtx.Lock()
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if nm == b.lastNm {
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raw, ok := b.containerCache.Get(string(binCnr))
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b.mtx.Unlock()
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if ok {
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cn := raw.([][]netmapSDK.NodeInfo)
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return BuildObjectPlacement(nm, cn, obj)
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}
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} else {
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b.containerCache.Purge()
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b.mtx.Unlock()
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}
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cn, err := nm.ContainerNodes(p, binCnr)
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if err != nil {
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return nil, fmt.Errorf("could not get container nodes: %w", err)
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}
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b.mtx.Lock()
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b.containerCache.Add(string(binCnr), cn)
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b.mtx.Unlock()
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return BuildObjectPlacement(nm, cn, obj)
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}
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func BuildObjectPlacement(nm *netmapSDK.NetMap, cnrNodes [][]netmapSDK.NodeInfo, id *oid.ID) ([][]netmapSDK.NodeInfo, error) {
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if id == nil {
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return cnrNodes, nil
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}
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binObj := make([]byte, sha256.Size)
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id.Encode(binObj)
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on, err := nm.PlacementVectors(cnrNodes, binObj)
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if err != nil {
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return nil, fmt.Errorf("could not get placement vectors for object: %w", err)
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}
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return on, nil
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}
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// FlattenNodes appends each row to the flat list.
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func FlattenNodes(ns [][]netmapSDK.NodeInfo) []netmapSDK.NodeInfo {
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var sz int
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for i := range ns {
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sz += len(ns[i])
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}
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result := make([]netmapSDK.NodeInfo, 0, sz)
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for i := range ns {
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result = append(result, ns[i]...)
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}
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return result
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}
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