Exemple #1
0
func NewDagModifier(ctx context.Context, from *mdag.Node, serv mdag.DAGService, mp pin.ManualPinner, spl chunk.SplitterGen) (*DagModifier, error) {
	return &DagModifier{
		curNode:  from.Copy(),
		dagserv:  serv,
		splitter: spl,
		ctx:      ctx,
		mp:       mp,
	}, nil
}
Exemple #2
0
func Diff(ctx context.Context, ds dag.DAGService, a, b *dag.Node) []*Change {
	if len(a.Links) == 0 && len(b.Links) == 0 {
		ak, _ := a.Key()
		bk, _ := b.Key()
		return []*Change{
			&Change{
				Type:   Mod,
				Before: ak,
				After:  bk,
			},
		}
	}

	var out []*Change
	clean_a := a.Copy()
	clean_b := b.Copy()

	// strip out unchanged stuff
	for _, lnk := range a.Links {
		l, err := b.GetNodeLink(lnk.Name)
		if err == nil {
			if bytes.Equal(l.Hash, lnk.Hash) {
				// no change... ignore it
			} else {
				anode, _ := lnk.GetNode(ctx, ds)
				bnode, _ := l.GetNode(ctx, ds)
				sub := Diff(ctx, ds, anode, bnode)

				for _, subc := range sub {
					subc.Path = path.Join(lnk.Name, subc.Path)
					out = append(out, subc)
				}
			}
			clean_a.RemoveNodeLink(l.Name)
			clean_b.RemoveNodeLink(l.Name)
		}
	}

	for _, lnk := range clean_a.Links {
		out = append(out, &Change{
			Type:   Remove,
			Path:   lnk.Name,
			Before: key.Key(lnk.Hash),
		})
	}
	for _, lnk := range clean_b.Links {
		out = append(out, &Change{
			Type:  Add,
			Path:  lnk.Name,
			After: key.Key(lnk.Hash),
		})
	}

	return out
}