// fillNodeRec will fill the given node with data from the dagBuilders input
// source down to an indirection depth as specified by 'depth'
// it returns the total dataSize of the node, and a potential error
//
// warning: **children** pinned indirectly, but input node IS NOT pinned.
func fillNodeRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int) error {
if depth < 0 {
return errors.New("attempt to fillNode at depth < 0")
}
// Base case
if depth <= 0 { // catch accidental -1's in case error above is removed.
return db.FillNodeWithData(node)
}
// while we have room AND we're not done
for node.NumChildren() < db.Maxlinks() && !db.Done() {
child := h.NewUnixfsNode()
if err := fillNodeRec(db, child, depth-1); err != nil {
return err
}
if err := node.AddChild(child, db); err != nil {
return err
}
}
return nil
}
func trickleDepthInfo(node *h.UnixfsNode, maxlinks int) (int, int) {
n := node.NumChildren()
if n < maxlinks {
return 0, 0
}
return ((n - maxlinks) / layerRepeat) + 1, (n - maxlinks) % layerRepeat
}
// appendFillLastChild will take in an incomplete trickledag node (uncomplete meaning, not full) and
// fill it out to the specified depth with blocks from the given DagBuilderHelper
func appendFillLastChild(ctx context.Context, ufsn *h.UnixfsNode, depth int, layerFill int, db *h.DagBuilderHelper) error {
if ufsn.NumChildren() <= db.Maxlinks() {
return nil
}
// Recursive step, grab last child
last := ufsn.NumChildren() - 1
lastChild, err := ufsn.GetChild(ctx, last, db.GetDagServ())
if err != nil {
return err
}
// Fill out last child (may not be full tree)
nchild, err := trickleAppendRec(ctx, lastChild, db, depth-1)
if err != nil {
return err
}
// Update changed child in parent node
ufsn.RemoveChild(last, db)
err = ufsn.AddChild(nchild, db)
if err != nil {
return err
}
// Partially filled depth layer
if layerFill != 0 {
for ; layerFill < layerRepeat && !db.Done(); layerFill++ {
next := h.NewUnixfsNode()
err := fillTrickleRec(db, next, depth)
if err != nil {
return err
}
err = ufsn.AddChild(next, db)
if err != nil {
return err
}
}
}
return nil
}