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package blob
import (
"bytes"
"io"
"gitlab.com/gitlab-org/gitaly/v15/internal/git"
"gitlab.com/gitlab-org/gitaly/v15/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/v15/proto/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/v15/streamio"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var treeEntryToObjectType = map[gitalypb.TreeEntry_EntryType]gitalypb.ObjectType{
gitalypb.TreeEntry_BLOB: gitalypb.ObjectType_BLOB,
gitalypb.TreeEntry_TREE: gitalypb.ObjectType_TREE,
gitalypb.TreeEntry_COMMIT: gitalypb.ObjectType_COMMIT,
}
func sendGetBlobsResponse(
req *gitalypb.GetBlobsRequest,
stream gitalypb.BlobService_GetBlobsServer,
objectReader catfile.ObjectReader,
objectInfoReader catfile.ObjectInfoReader,
) error {
ctx := stream.Context()
tef := catfile.NewTreeEntryFinder(objectReader, objectInfoReader)
for _, revisionPath := range req.RevisionPaths {
revision := revisionPath.Revision
path := revisionPath.Path
if len(path) > 1 {
path = bytes.TrimRight(path, "/")
}
treeEntry, err := tef.FindByRevisionAndPath(ctx, revision, string(path))
if err != nil {
return err
}
response := &gitalypb.GetBlobsResponse{Revision: revision, Path: path}
if treeEntry == nil || len(treeEntry.Oid) == 0 {
if err := stream.Send(response); err != nil {
return status.Errorf(codes.Unavailable, "GetBlobs: send: %v", err)
}
continue
}
response.Mode = treeEntry.Mode
response.Oid = treeEntry.Oid
if treeEntry.Type == gitalypb.TreeEntry_COMMIT {
response.IsSubmodule = true
response.Type = gitalypb.ObjectType_COMMIT
if err := stream.Send(response); err != nil {
return status.Errorf(codes.Unavailable, "GetBlobs: send: %v", err)
}
continue
}
objectInfo, err := objectInfoReader.Info(ctx, git.Revision(treeEntry.Oid))
if err != nil {
return status.Errorf(codes.Internal, "GetBlobs: %v", err)
}
response.Size = objectInfo.Size
var ok bool
response.Type, ok = treeEntryToObjectType[treeEntry.Type]
if !ok {
continue
}
if response.Type != gitalypb.ObjectType_BLOB {
if err := stream.Send(response); err != nil {
return status.Errorf(codes.Unavailable, "GetBlobs: send: %v", err)
}
continue
}
if err = sendBlobTreeEntry(response, stream, objectReader, req.GetLimit()); err != nil {
return err
}
}
return nil
}
func sendBlobTreeEntry(
response *gitalypb.GetBlobsResponse,
stream gitalypb.BlobService_GetBlobsServer,
objectReader catfile.ObjectReader,
limit int64,
) (returnedErr error) {
ctx := stream.Context()
var readLimit int64
if limit < 0 || limit > response.Size {
readLimit = response.Size
} else {
readLimit = limit
}
// For correctness it does not matter, but for performance, the order is
// important: first check if readlimit == 0, if not, only then create
// blobObj.
if readLimit == 0 {
if err := stream.Send(response); err != nil {
return status.Errorf(codes.Unavailable, "GetBlobs: send: %v", err)
}
return nil
}
blobObj, err := objectReader.Object(ctx, git.Revision(response.Oid))
if err != nil {
return status.Errorf(codes.Internal, "GetBlobs: %v", err)
}
defer func() {
if _, err := io.Copy(io.Discard, blobObj); err != nil && returnedErr == nil {
returnedErr = status.Errorf(codes.Internal, "GetBlobs: discarding data: %v", err)
}
}()
if blobObj.Type != "blob" {
return status.Errorf(codes.Internal, "blob got unexpected type %q", blobObj.Type)
}
sw := streamio.NewWriter(func(p []byte) error {
msg := &gitalypb.GetBlobsResponse{}
if response != nil {
msg = response
response = nil
}
msg.Data = p
return stream.Send(msg)
})
_, err = io.CopyN(sw, blobObj, readLimit)
if err != nil {
return status.Errorf(codes.Unavailable, "GetBlobs: send: %v", err)
}
return nil
}
func (s *server) GetBlobs(req *gitalypb.GetBlobsRequest, stream gitalypb.BlobService_GetBlobsServer) error {
if err := validateGetBlobsRequest(req); err != nil {
return err
}
repo := s.localrepo(req.GetRepository())
objectReader, cancel, err := s.catfileCache.ObjectReader(stream.Context(), repo)
if err != nil {
return err
}
defer cancel()
objectInfoReader, cancel, err := s.catfileCache.ObjectInfoReader(stream.Context(), repo)
if err != nil {
return err
}
defer cancel()
return sendGetBlobsResponse(req, stream, objectReader, objectInfoReader)
}
func validateGetBlobsRequest(req *gitalypb.GetBlobsRequest) error {
if req.Repository == nil {
return status.Errorf(codes.InvalidArgument, "GetBlobs: empty Repository")
}
if len(req.RevisionPaths) == 0 {
return status.Errorf(codes.InvalidArgument, "GetBlobs: empty RevisionPaths")
}
for _, rp := range req.RevisionPaths {
if err := git.ValidateRevision([]byte(rp.Revision)); err != nil {
return status.Errorf(codes.InvalidArgument, "GetBlobs: %v", err)
}
}
return nil
}
|
