frostfs-node/pkg/local_object_storage/pilorama/interface.go
Evgenii Stratonikov a2bb3a2a96 [#1630] pilorama: Support dropping trees
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
2022-09-12 09:54:15 +03:00

71 lines
3 KiB
Go

package pilorama
import (
"errors"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
cidSDK "github.com/nspcc-dev/neofs-sdk-go/container/id"
)
// Forest represents CRDT tree.
type Forest interface {
// TreeMove moves node in the tree.
// If the parent of the move operation is TrashID, the node is removed.
// If the child of the move operation is RootID, new ID is generated and added to a tree.
TreeMove(d CIDDescriptor, treeID string, m *Move) (*LogMove, error)
// TreeAddByPath adds new node in the tree using provided path.
// The path is constructed by descending from the root using the values of the attr in meta.
// Internal nodes in path should have exactly one attribute, otherwise a new node is created.
TreeAddByPath(d CIDDescriptor, treeID string, attr string, path []string, meta []KeyValue) ([]LogMove, error)
// TreeApply applies replicated operation from another node.
TreeApply(d CIDDescriptor, treeID string, m *Move) error
// TreeGetByPath returns all nodes corresponding to the path.
// The path is constructed by descending from the root using the values of the
// AttributeFilename in meta.
// The last argument determines whether only the node with the latest timestamp is returned.
// Should return ErrTreeNotFound if the tree is not found, and empty result if the path is not in the tree.
TreeGetByPath(cid cidSDK.ID, treeID string, attr string, path []string, latest bool) ([]Node, error)
// TreeGetMeta returns meta information of the node with the specified ID.
// Should return ErrTreeNotFound if the tree is not found, and empty result if the node is not in the tree.
TreeGetMeta(cid cidSDK.ID, treeID string, nodeID Node) (Meta, Node, error)
// TreeGetChildren returns children of the node with the specified ID. The order is arbitrary.
// Should return ErrTreeNotFound if the tree is not found, and empty result if the node is not in the tree.
TreeGetChildren(cid cidSDK.ID, treeID string, nodeID Node) ([]uint64, error)
// TreeGetOpLog returns first log operation stored at or above the height.
// In case no such operation is found, empty Move and nil error should be returned.
TreeGetOpLog(cid cidSDK.ID, treeID string, height uint64) (Move, error)
// TreeDrop drops a tree from the database.
// If the tree is not found, ErrTreeNotFound should be returned.
TreeDrop(cid cidSDK.ID, treeID string) error
}
type ForestStorage interface {
// DumpInfo returns information about the pilorama.
DumpInfo() Info
Init() error
Open(bool) error
Close() error
SetMode(m mode.Mode) error
Forest
}
const (
AttributeFilename = "FileName"
AttributeVersion = "Version"
)
// CIDDescriptor contains container ID and information about the node position
// in the list of container nodes.
type CIDDescriptor struct {
CID cidSDK.ID
Position int
Size int
}
// ErrInvalidCIDDescriptor is returned when info about tne node position
// in the container is invalid.
var ErrInvalidCIDDescriptor = errors.New("cid descriptor is invalid")
func (d CIDDescriptor) checkValid() bool {
return 0 <= d.Position && d.Position < d.Size
}