Пример #1
0
func TrickleLayout(db *h.DagBuilderHelper) (*dag.Node, error) {
	root := h.NewUnixfsNode()
	if err := db.FillNodeLayer(root); err != nil {
		return nil, err
	}
	for level := 1; !db.Done(); level++ {
		for i := 0; i < layerRepeat && !db.Done(); i++ {
			next := h.NewUnixfsNode()
			if err := fillTrickleRec(db, next, level); err != nil {
				return nil, err
			}
			if err := root.AddChild(next, db); err != nil {
				return nil, err
			}
		}
	}

	out, err := db.Add(root)
	if err != nil {
		return nil, err
	}

	if err := db.Close(); err != nil {
		return nil, err
	}

	return out, nil
}
Пример #2
0
// TrickleAppend appends the data in `db` to the dag, using the Trickledag format
func TrickleAppend(ctx context.Context, base *dag.Node, db *h.DagBuilderHelper) (out *dag.Node, err_out error) {
	defer func() {
		if err_out == nil {
			if err := db.Close(); err != nil {
				err_out = err
			}
		}
	}()

	// Convert to unixfs node for working with easily
	ufsn, err := h.NewUnixfsNodeFromDag(base)
	if err != nil {
		return nil, err
	}

	// Get depth of this 'tree'
	n, layerProgress := trickleDepthInfo(ufsn, db.Maxlinks())
	if n == 0 {
		// If direct blocks not filled...
		if err := db.FillNodeLayer(ufsn); err != nil {
			return nil, err
		}

		if db.Done() {
			return ufsn.GetDagNode()
		}

		// If continuing, our depth has increased by one
		n++
	}

	// Last child in this node may not be a full tree, lets file it up
	if err := appendFillLastChild(ctx, ufsn, n-1, layerProgress, db); err != nil {
		return nil, err
	}

	// after appendFillLastChild, our depth is now increased by one
	if !db.Done() {
		n++
	}

	// Now, continue filling out tree like normal
	for i := n; !db.Done(); i++ {
		for j := 0; j < layerRepeat && !db.Done(); j++ {
			next := h.NewUnixfsNode()
			err := fillTrickleRec(db, next, i)
			if err != nil {
				return nil, err
			}

			err = ufsn.AddChild(next, db)
			if err != nil {
				return nil, err
			}
		}
	}

	return ufsn.GetDagNode()
}
Пример #3
0
// recursive call for TrickleAppend
func trickleAppendRec(ctx context.Context, ufsn *h.UnixfsNode, db *h.DagBuilderHelper, depth int) (*h.UnixfsNode, error) {
	if depth == 0 || db.Done() {
		return ufsn, nil
	}

	// Get depth of this 'tree'
	n, layerProgress := trickleDepthInfo(ufsn, db.Maxlinks())
	if n == 0 {
		// If direct blocks not filled...
		if err := db.FillNodeLayer(ufsn); err != nil {
			return nil, err
		}
		n++
	}

	// If at correct depth, no need to continue
	if n == depth {
		return ufsn, nil
	}

	if err := appendFillLastChild(ctx, ufsn, n, layerProgress, db); err != nil {
		return nil, err
	}

	// after appendFillLastChild, our depth is now increased by one
	if !db.Done() {
		n++
	}

	// Now, continue filling out tree like normal
	for i := n; i < depth && !db.Done(); i++ {
		for j := 0; j < layerRepeat && !db.Done(); j++ {
			next := h.NewUnixfsNode()
			if err := fillTrickleRec(db, next, i); err != nil {
				return nil, err
			}

			if err := ufsn.AddChild(next, db); err != nil {
				return nil, err
			}
		}
	}

	return ufsn, nil
}
Пример #4
0
func fillTrickleRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int) error {
	// Always do this, even in the base case
	if err := db.FillNodeLayer(node); err != nil {
		return err
	}

	for i := 1; i < depth && !db.Done(); i++ {
		for j := 0; j < layerRepeat && !db.Done(); j++ {
			next := h.NewUnixfsNode()
			if err := fillTrickleRec(db, next, i); err != nil {
				return err
			}

			if err := node.AddChild(next, db); err != nil {
				return err
			}
		}
	}
	return nil
}