frostfs-node/pkg/local_object_storage/pilorama/forest.go

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package pilorama
import (
"sort"
"strings"
"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
cidSDK "github.com/TrueCloudLab/frostfs-sdk-go/container/id"
)
// memoryForest represents multiple replicating trees sharing a single storage.
type memoryForest struct {
// treeMap maps tree identifier (container ID + name) to the replicated log.
treeMap map[string]*state
}
var _ Forest = (*memoryForest)(nil)
// NewMemoryForest creates new empty forest.
// TODO: this function will eventually be removed and is here for debugging.
func NewMemoryForest() ForestStorage {
return &memoryForest{
treeMap: make(map[string]*state),
}
}
// TreeMove implements the Forest interface.
func (f *memoryForest) TreeMove(d CIDDescriptor, treeID string, op *Move) (*LogMove, error) {
if !d.checkValid() {
return nil, ErrInvalidCIDDescriptor
}
fullID := d.CID.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
s = newState()
f.treeMap[fullID] = s
}
op.Time = s.timestamp(d.Position, d.Size)
if op.Child == RootID {
op.Child = s.findSpareID()
}
lm := s.do(op)
s.operations = append(s.operations, lm)
return &lm, nil
}
// TreeAddByPath implements the Forest interface.
func (f *memoryForest) TreeAddByPath(d CIDDescriptor, treeID string, attr string, path []string, m []KeyValue) ([]LogMove, error) {
if !d.checkValid() {
return nil, ErrInvalidCIDDescriptor
}
if !isAttributeInternal(attr) {
return nil, ErrNotPathAttribute
}
fullID := d.CID.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
s = newState()
f.treeMap[fullID] = s
}
i, node := s.getPathPrefix(attr, path)
lm := make([]LogMove, len(path)-i+1)
for j := i; j < len(path); j++ {
lm[j-i] = s.do(&Move{
Parent: node,
Meta: Meta{
Time: s.timestamp(d.Position, d.Size),
Items: []KeyValue{{Key: attr, Value: []byte(path[j])}}},
Child: s.findSpareID(),
})
node = lm[j-i].Child
s.operations = append(s.operations, lm[j-i])
}
mCopy := make([]KeyValue, len(m))
copy(mCopy, m)
lm[len(lm)-1] = s.do(&Move{
Parent: node,
Meta: Meta{
Time: s.timestamp(d.Position, d.Size),
Items: mCopy,
},
Child: s.findSpareID(),
})
return lm, nil
}
// TreeApply implements the Forest interface.
func (f *memoryForest) TreeApply(d CIDDescriptor, treeID string, op *Move, _ bool) error {
if !d.checkValid() {
return ErrInvalidCIDDescriptor
}
fullID := d.CID.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
s = newState()
f.treeMap[fullID] = s
}
return s.Apply(op)
}
func (f *memoryForest) Init() error {
return nil
}
func (f *memoryForest) Open(bool) error {
return nil
}
func (f *memoryForest) SetMode(mode.Mode) error {
return nil
}
func (f *memoryForest) Close() error {
return nil
}
// TreeGetByPath implements the Forest interface.
func (f *memoryForest) TreeGetByPath(cid cidSDK.ID, treeID string, attr string, path []string, latest bool) ([]Node, error) {
if !isAttributeInternal(attr) {
return nil, ErrNotPathAttribute
}
fullID := cid.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
return nil, ErrTreeNotFound
}
return s.get(attr, path, latest), nil
}
// TreeGetMeta implements the Forest interface.
func (f *memoryForest) TreeGetMeta(cid cidSDK.ID, treeID string, nodeID Node) (Meta, Node, error) {
fullID := cid.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
return Meta{}, 0, ErrTreeNotFound
}
return s.getMeta(nodeID), s.infoMap[nodeID].Parent, nil
}
// TreeGetChildren implements the Forest interface.
func (f *memoryForest) TreeGetChildren(cid cidSDK.ID, treeID string, nodeID Node) ([]uint64, error) {
fullID := cid.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
return nil, ErrTreeNotFound
}
children, ok := s.childMap[nodeID]
if !ok {
return nil, nil
}
res := make([]Node, len(children))
copy(res, children)
return res, nil
}
// TreeGetOpLog implements the pilorama.Forest interface.
func (f *memoryForest) TreeGetOpLog(cid cidSDK.ID, treeID string, height uint64) (Move, error) {
fullID := cid.String() + "/" + treeID
s, ok := f.treeMap[fullID]
if !ok {
return Move{}, ErrTreeNotFound
}
n := sort.Search(len(s.operations), func(i int) bool {
return s.operations[i].Time >= height
})
if n == len(s.operations) {
return Move{}, nil
}
return s.operations[n].Move, nil
}
// TreeDrop implements the pilorama.Forest interface.
func (f *memoryForest) TreeDrop(cid cidSDK.ID, treeID string) error {
cidStr := cid.String()
if treeID == "" {
for k := range f.treeMap {
if strings.HasPrefix(k, cidStr) {
delete(f.treeMap, k)
}
}
} else {
fullID := cidStr + "/" + treeID
_, ok := f.treeMap[fullID]
if !ok {
return ErrTreeNotFound
}
delete(f.treeMap, fullID)
}
return nil
}
// TreeList implements the pilorama.Forest interface.
func (f *memoryForest) TreeList(cid cidSDK.ID) ([]string, error) {
var res []string
cidStr := cid.EncodeToString()
for k := range f.treeMap {
cidAndTree := strings.Split(k, "/")
if cidAndTree[0] != cidStr {
continue
}
res = append(res, cidAndTree[1])
}
return res, nil
}
// TreeExists implements the pilorama.Forest interface.
func (f *memoryForest) TreeExists(cid cidSDK.ID, treeID string) (bool, error) {
fullID := cid.EncodeToString() + "/" + treeID
_, ok := f.treeMap[fullID]
return ok, nil
}