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testutil.go
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testutil.go
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package testutil
import (
"bytes"
"fmt"
"io"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/ipld/go-ipld-prime"
// used to make sure we have dagcbor encoding
_ "github.com/ipld/go-ipld-prime/codec/dagcbor"
cidlink "github.com/ipld/go-ipld-prime/linking/cid"
)
// EncodeBlock produces an encoded block from a node
func EncodeBlock(n ipld.Node) (blocks.Block, ipld.Node, ipld.Link) {
ls := cidlink.DefaultLinkSystem()
var b blocks.Block
lb := cidlink.LinkPrototype{Prefix: cid.Prefix{
Version: 1,
Codec: 0x71,
MhType: 0x17,
MhLength: 20,
}}
ls.StorageReadOpener = func(ipld.LinkContext, ipld.Link) (io.Reader, error) {
return bytes.NewReader(b.RawData()), nil
}
ls.StorageWriteOpener = func(ipld.LinkContext) (io.Writer, ipld.BlockWriteCommitter, error) {
buf := bytes.Buffer{}
return &buf, func(lnk ipld.Link) error {
clnk, ok := lnk.(cidlink.Link)
if !ok {
return fmt.Errorf("incorrect link type %v", lnk)
}
var err error
b, err = blocks.NewBlockWithCid(buf.Bytes(), clnk.Cid)
return err
}, nil
}
lnk, err := ls.Store(ipld.LinkContext{}, lb, n)
if err != nil {
panic(err)
}
ln, err := ls.Load(ipld.LinkContext{}, lnk, n.Prototype())
if err != nil {
panic(err)
}
return b, ln, lnk
}