package pilorama import ( "errors" 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) } type ForestStorage interface { // DumpInfo returns information about the pilorama. DumpInfo() Info Init() error Open() error Close() 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 }