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