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package importer_test
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"io"
"os"
"sync"
"testing"
castorev1pb "code.tvl.fyi/tvix/castore-go"
"code.tvl.fyi/tvix/nar-bridge/pkg/importer"
storev1pb "code.tvl.fyi/tvix/store-go"
"github.com/stretchr/testify/require"
)
func TestRoundtrip(t *testing.T) {
// We pipe nar_1094wph9z4nwlgvsd53abfz8i117ykiv5dwnq9nnhz846s7xqd7d.nar to
// storev1pb.Export, and store all the file contents and directory objects
// received in two hashmaps.
// We then feed it to the writer, and test we come up with the same NAR file.
f, err := os.Open("../../testdata/nar_1094wph9z4nwlgvsd53abfz8i117ykiv5dwnq9nnhz846s7xqd7d.nar")
require.NoError(t, err)
narContents, err := io.ReadAll(f)
require.NoError(t, err)
var mu sync.Mutex
blobsMap := make(map[string][]byte, 0)
directoriesMap := make(map[string]*castorev1pb.Directory)
rootNode, _, _, err := importer.Import(
context.Background(),
bytes.NewBuffer(narContents),
func(blobReader io.Reader) ([]byte, error) {
// read in contents, we need to put it into filesMap later.
contents, err := io.ReadAll(blobReader)
require.NoError(t, err)
dgst := mustBlobDigest(bytes.NewReader(contents))
// put it in filesMap
mu.Lock()
blobsMap[base64.StdEncoding.EncodeToString(dgst)] = contents
mu.Unlock()
return dgst, nil
},
func(directory *castorev1pb.Directory) ([]byte, error) {
dgst := mustDirectoryDigest(directory)
directoriesMap[base64.StdEncoding.EncodeToString(dgst)] = directory
return dgst, nil
},
)
require.NoError(t, err)
// done populating everything, now actually test the export :-)
var narBuf bytes.Buffer
err = storev1pb.Export(
&narBuf,
rootNode,
func(directoryDgst []byte) (*castorev1pb.Directory, error) {
d, found := directoriesMap[base64.StdEncoding.EncodeToString(directoryDgst)]
if !found {
panic(fmt.Sprintf("directory %v not found", base64.StdEncoding.EncodeToString(directoryDgst)))
}
return d, nil
},
func(blobDgst []byte) (io.ReadCloser, error) {
blobContents, found := blobsMap[base64.StdEncoding.EncodeToString(blobDgst)]
if !found {
panic(fmt.Sprintf("blob %v not found", base64.StdEncoding.EncodeToString(blobDgst)))
}
return io.NopCloser(bytes.NewReader(blobContents)), nil
},
)
require.NoError(t, err, "exporter shouldn't fail")
require.Equal(t, narContents, narBuf.Bytes())
}
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