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package importer
import (
"bytes"
"context"
"encoding/base64"
"fmt"
castorev1pb "code.tvl.fyi/tvix/castore-go"
log "github.com/sirupsen/logrus"
)
// DirectoriesUploader opens a Put stream when it receives the first Put() call,
// and then uses the opened stream for subsequent Put() calls.
// When the uploading is finished, a call to Done() will close the stream and
// return the root digest returned from the directoryServiceClient.
type DirectoriesUploader struct {
ctx context.Context
directoryServiceClient castorev1pb.DirectoryServiceClient
directoryServicePutStream castorev1pb.DirectoryService_PutClient
lastDirectoryDigest []byte
}
func NewDirectoriesUploader(ctx context.Context, directoryServiceClient castorev1pb.DirectoryServiceClient) *DirectoriesUploader {
return &DirectoriesUploader{
ctx: ctx,
directoryServiceClient: directoryServiceClient,
directoryServicePutStream: nil,
}
}
func (du *DirectoriesUploader) Put(directory *castorev1pb.Directory) ([]byte, error) {
directoryDigest, err := directory.Digest()
if err != nil {
return nil, fmt.Errorf("failed calculating directory digest: %w", err)
}
// Send the directory to the directory service
// If the stream hasn't been initialized yet, do it first
if du.directoryServicePutStream == nil {
directoryServicePutStream, err := du.directoryServiceClient.Put(du.ctx)
if err != nil {
return nil, fmt.Errorf("unable to initialize directory service put stream: %v", err)
}
du.directoryServicePutStream = directoryServicePutStream
}
// send the directory out
err = du.directoryServicePutStream.Send(directory)
if err != nil {
return nil, fmt.Errorf("error sending directory: %w", err)
}
log.WithField("digest", base64.StdEncoding.EncodeToString(directoryDigest)).Debug("uploaded directory")
// update lastDirectoryDigest
du.lastDirectoryDigest = directoryDigest
return directoryDigest, nil
}
// Done closes the stream and returns the response.
// It returns null if closed for a second time.
func (du *DirectoriesUploader) Done() (*castorev1pb.PutDirectoryResponse, error) {
// only close once, and only if we opened.
if du.directoryServicePutStream == nil {
return nil, nil
}
putDirectoryResponse, err := du.directoryServicePutStream.CloseAndRecv()
if err != nil {
return nil, fmt.Errorf("unable to close directory service put stream: %v", err)
}
// ensure the response contains the same digest as the one we have in lastDirectoryDigest.
// Otherwise, the backend came up with another digest than we, in which we return an error.
if !bytes.Equal(du.lastDirectoryDigest, putDirectoryResponse.RootDigest) {
return nil, fmt.Errorf(
"backend calculated different root digest as we, expected %s, actual %s",
base64.StdEncoding.EncodeToString(du.lastDirectoryDigest),
base64.StdEncoding.EncodeToString(putDirectoryResponse.RootDigest),
)
}
// clear directoryServicePutStream.
du.directoryServicePutStream = nil
return putDirectoryResponse, nil
}
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