func randNode() (*mdag.Node, util.Key) {
nd := new(mdag.Node)
nd.Data = make([]byte, 32)
util.NewTimeSeededRand().Read(nd.Data)
k, _ := nd.Key()
return nd, k
}
func (p *pinner) pinIndirectRecurse(node *mdag.Node) error {
k, err := node.Key()
if err != nil {
return err
}
p.indirPin.Increment(k)
return p.pinLinks(node)
}
func NewDagModifier(from *mdag.Node, serv mdag.DAGService, spl chunk.BlockSplitter) (*DagModifier, error) {
pbd, err := ft.FromBytes(from.Data)
if err != nil {
return nil, err
}
return &DagModifier{
curNode: from.Copy(),
dagserv: serv,
pbdata: pbd,
splitter: spl,
}, nil
}
// converts the Node object into a real dag.Node
func deserializeNode(node *Node) (*dag.Node, error) {
dagnode := new(dag.Node)
dagnode.Data = node.Data
dagnode.Links = make([]*dag.Link, len(node.Links))
for i, link := range node.Links {
hash, err := mh.FromB58String(link.Hash)
if err != nil {
return nil, err
}
dagnode.Links[i] = &dag.Link{
Name: link.Name,
Size: link.Size,
Hash: hash,
}
}
return dagnode, nil
}
func getOutput(dagnode *dag.Node) (*Object, error) {
key, err := dagnode.Key()
if err != nil {
return nil, err
}
output := &Object{
Hash: key.Pretty(),
Links: make([]Link, len(dagnode.Links)),
}
for i, link := range dagnode.Links {
output.Links[i] = Link{
Name: link.Name,
Hash: link.Hash.B58String(),
Size: link.Size,
}
}
return output, nil
}
func (p *pinner) unpinLinks(node *mdag.Node) error {
for _, l := range node.Links {
node, err := l.GetNode(p.dserv)
if err != nil {
return err
}
k, err := node.Key()
if err != nil {
return err
}
p.recursePin.RemoveBlock(k)
err = p.unpinLinks(node)
if err != nil {
return err
}
}
return nil
}
// Pin the given node, optionally recursive
func (p *pinner) Pin(node *mdag.Node, recurse bool) error {
p.lock.Lock()
defer p.lock.Unlock()
k, err := node.Key()
if err != nil {
return err
}
if recurse {
if p.recursePin.HasKey(k) {
return nil
}
p.recursePin.AddBlock(k)
err := p.pinLinks(node)
if err != nil {
return err
}
} else {
p.directPin.AddBlock(k)
}
return nil
}
