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-go/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()) }