/
toblocks.go
60 lines (56 loc) · 1.83 KB
/
toblocks.go
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package testutil
import (
"bytes"
"io"
"testing"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-unixfsnode"
dagpb "github.com/ipld/go-codec-dagpb"
"github.com/ipld/go-ipld-prime/datamodel"
"github.com/ipld/go-ipld-prime/linking"
cidlink "github.com/ipld/go-ipld-prime/linking/cid"
"github.com/ipld/go-ipld-prime/node/basicnode"
"github.com/ipld/go-ipld-prime/traversal"
"github.com/ipld/go-ipld-prime/traversal/selector"
"github.com/stretchr/testify/require"
)
// ToBlocks makes a block array from ordered blocks in a traversal
func ToBlocks(t *testing.T, lsys linking.LinkSystem, root cid.Cid, selNode datamodel.Node) []blocks.Block {
sel, err := selector.CompileSelector(selNode)
require.NoError(t, err)
traversedBlocks := make([]blocks.Block, 0)
unixfsnode.AddUnixFSReificationToLinkSystem(&lsys)
osro := lsys.StorageReadOpener
lsys.StorageReadOpener = func(lc linking.LinkContext, l datamodel.Link) (io.Reader, error) {
r, err := osro(lc, l)
if err != nil {
return nil, err
}
byts, err := io.ReadAll(r)
if err != nil {
return nil, err
}
blk, err := blocks.NewBlockWithCid(byts, l.(cidlink.Link).Cid)
if err != nil {
return nil, err
}
traversedBlocks = append(traversedBlocks, blk)
return bytes.NewReader(byts), nil
}
var proto datamodel.NodePrototype = basicnode.Prototype.Any
if root.Prefix().Codec == cid.DagProtobuf {
proto = dagpb.Type.PBNode
}
rootNode, err := lsys.Load(linking.LinkContext{}, cidlink.Link{Cid: root}, proto)
require.NoError(t, err)
prog := traversal.Progress{
Cfg: &traversal.Config{
LinkSystem: lsys,
LinkTargetNodePrototypeChooser: dagpb.AddSupportToChooser(basicnode.Chooser),
},
}
err = prog.WalkMatching(rootNode, sel, unixfsnode.BytesConsumingMatcher)
require.NoError(t, err)
return traversedBlocks
}