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Add DAGService.GetLinks() method and use it in the GC and elsewhere.

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This method will use the (also new) LinkService if it is available to
retrieving just the links for a MerkleDAG without necessary having to
retrieve the underlying block.

For now the main benefit is that the pinner will not break when a block
becomes invalid due to a change in the backing file.  This is possible
because the metadata for a block (that includes the Links) is stored
separately and thus always available even if the backing file changes.

License: MIT
Signed-off-by: Kevin Atkinson <k@kevina.org>
This commit is contained in:
Kevin Atkinson
2016-08-19 15:52:27 -04:00
parent 67a1b3e1bf
commit 3899194cb0
8 changed files with 61 additions and 35 deletions
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4
core/coreunix/add_test.go
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@ -98,7 +98,7 @@ func TestAddGCLive(t *testing.T) {
gcstarted := make(chan struct{})
go func() {
defer close(gcstarted)
gcchan, err := gc.GC(context.Background(), node.Blockstore, node.Pinning, nil)
gcchan, err := gc.GC(context.Background(), node.Blockstore, node.LinkService, node.Pinning, nil)
if err != nil {
log.Error("GC ERROR:", err)
errs <- err
@ -162,7 +162,7 @@ func TestAddGCLive(t *testing.T) {
}
set := cid.NewSet()
err = dag.EnumerateChildren(ctx, node.DAG, root, set.Visit, false)
err = dag.EnumerateChildren(ctx, node.DAG, root.Links, set.Visit, false)
if err != nil {
t.Fatal(err)
}