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package server
import (
"bytes"
"context"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"io"
"io/fs"
"net/http"
"sync"
"code.tvl.fyi/tvix/nar-bridge/pkg/writer"
storev1pb "code.tvl.fyi/tvix/store/protos"
"github.com/go-chi/chi/v5"
nixhash "github.com/nix-community/go-nix/pkg/hash"
"github.com/nix-community/go-nix/pkg/nixbase32"
log "github.com/sirupsen/logrus"
)
const (
narUrl = "/nar/{narhash:^([" + nixbase32.Alphabet + "]{52})$}.nar"
)
func renderNar(
ctx context.Context,
log *log.Entry,
directoryServiceClient storev1pb.DirectoryServiceClient,
blobServiceClient storev1pb.BlobServiceClient,
narHashToPathInfoMu *sync.Mutex,
narHashToPathInfo map[string]*storev1pb.PathInfo,
w io.Writer,
narHash *nixhash.Hash,
headOnly bool,
) error {
// look in the lookup table
narHashToPathInfoMu.Lock()
pathInfo, found := narHashToPathInfo[narHash.SRIString()]
narHashToPathInfoMu.Unlock()
// if we didn't find anything, return 404.
if !found {
return fmt.Errorf("narHash not found: %w", fs.ErrNotExist)
}
// if this was only a head request, we're done.
if headOnly {
return nil
}
directories := make(map[string]*storev1pb.Directory)
// If the root node is a directory, ask the directory service for all directories
if pathInfoDirectory := pathInfo.GetNode().GetDirectory(); pathInfoDirectory != nil {
rootDirectoryDigest := pathInfoDirectory.GetDigest()
log = log.WithField("root_directory", base64.StdEncoding.EncodeToString(rootDirectoryDigest))
directoryStream, err := directoryServiceClient.Get(ctx, &storev1pb.GetDirectoryRequest{
ByWhat: &storev1pb.GetDirectoryRequest_Digest{
Digest: rootDirectoryDigest,
},
Recursive: true,
})
if err != nil {
return fmt.Errorf("unable to query directory stream: %w", err)
}
// For now, we just stream all of these locally and put them into a hashmap,
// which is used in the lookup function below.
for {
directory, err := directoryStream.Recv()
if err != nil {
if err == io.EOF {
break
}
return fmt.Errorf("unable to receive from directory stream: %w", err)
}
// calculate directory digest
// TODO: do we need to do any more validation?
directoryDgst, err := directory.Digest()
if err != nil {
return fmt.Errorf("unable to calculate directory digest: %w", err)
}
log.WithField("directory", base64.StdEncoding.EncodeToString(directoryDgst)).Debug("received directory node")
directories[hex.EncodeToString(directoryDgst)] = directory
}
}
// render the NAR file
err := writer.Export(
w,
pathInfo,
func(directoryDigest []byte) (*storev1pb.Directory, error) {
log.WithField("directory", base64.StdEncoding.EncodeToString(directoryDigest)).Debug("Get directory")
directoryRefStr := hex.EncodeToString(directoryDigest)
directory, found := directories[directoryRefStr]
if !found {
return nil, fmt.Errorf(
"directory with hash %v does not exist: %w",
directoryDigest,
fs.ErrNotExist,
)
}
return directory, nil
},
func(blobDigest []byte) (io.ReadCloser, error) {
log.WithField("blob", base64.StdEncoding.EncodeToString(blobDigest)).Debug("Get blob")
resp, err := blobServiceClient.Read(ctx, &storev1pb.ReadBlobRequest{
Digest: blobDigest,
})
if err != nil {
return nil, fmt.Errorf("unable to get blob: %w", err)
}
// TODO: spin up a goroutine producing this.
data := &bytes.Buffer{}
for {
chunk, err := resp.Recv()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
return nil, fmt.Errorf("read chunk: %w", err)
}
_, err = data.Write(chunk.GetData())
if err != nil {
return nil, fmt.Errorf("buffer chunk: %w", err)
}
}
return io.NopCloser(data), nil
},
)
if err != nil {
return fmt.Errorf("unable to export nar: %w", err)
}
return nil
}
func registerNarGet(s *Server) {
// TODO: properly compose this
s.handler.Head(narUrl, func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
ctx := r.Context()
// parse the narhash sent in the request URL
narHash, err := parseNarHashFromUrl(chi.URLParamFromCtx(ctx, "narhash"))
if err != nil {
log.WithError(err).WithField("url", r.URL).Error("unable to decode nar hash from url")
w.WriteHeader(http.StatusBadRequest)
_, err := w.Write([]byte("unable to decode nar hash from url"))
if err != nil {
log.WithError(err).Errorf("unable to write error message to client")
}
return
}
log := log.WithField("narhash_url", narHash.SRIString())
err = renderNar(ctx, log, s.directoryServiceClient, s.blobServiceClient, &s.narHashToPathInfoMu, s.narHashToPathInfo, w, narHash, true)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
w.WriteHeader(http.StatusNotFound)
} else {
log.WithError(err).Warn("unable to render nar")
w.WriteHeader(http.StatusInternalServerError)
}
}
})
s.handler.Get(narUrl, func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
ctx := r.Context()
// parse the narhash sent in the request URL
narHash, err := parseNarHashFromUrl(chi.URLParamFromCtx(ctx, "narhash"))
if err != nil {
log.WithError(err).WithField("url", r.URL).Error("unable to decode nar hash from url")
w.WriteHeader(http.StatusBadRequest)
_, err := w.Write([]byte("unable to decode nar hash from url"))
if err != nil {
log.WithError(err).Errorf("unable to write error message to client")
}
return
}
log := log.WithField("narhash_url", narHash.SRIString())
err = renderNar(ctx, log, s.directoryServiceClient, s.blobServiceClient, &s.narHashToPathInfoMu, s.narHashToPathInfo, w, narHash, false)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
w.WriteHeader(http.StatusNotFound)
} else {
w.WriteHeader(http.StatusInternalServerError)
}
}
})
}
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