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package blob
import (
"fmt"
"io"
"gitlab.com/gitlab-org/gitaly/v14/internal/git"
"gitlab.com/gitlab-org/gitaly/v14/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/v14/internal/helper"
"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/v14/streamio"
)
func (s *server) GetBlob(in *gitalypb.GetBlobRequest, stream gitalypb.BlobService_GetBlobServer) error {
ctx := stream.Context()
repo := s.localrepo(in.GetRepository())
if err := validateRequest(in); err != nil {
return helper.ErrInvalidArgumentf("GetBlob: %v", err)
}
objectReader, cancel, err := s.catfileCache.ObjectReader(stream.Context(), repo)
if err != nil {
return helper.ErrInternalf("GetBlob: %v", err)
}
defer cancel()
blob, err := objectReader.Object(ctx, git.Revision(in.Oid))
if err != nil {
if catfile.IsNotFound(err) {
return helper.ErrUnavailable(stream.Send(&gitalypb.GetBlobResponse{}))
}
return helper.ErrInternalf("GetBlob: %v", err)
}
if blob.Type != "blob" {
return helper.ErrUnavailable(stream.Send(&gitalypb.GetBlobResponse{}))
}
readLimit := blob.Size
if in.Limit >= 0 && in.Limit < readLimit {
readLimit = in.Limit
}
firstMessage := &gitalypb.GetBlobResponse{
Size: blob.Size,
Oid: blob.Oid.String(),
}
if readLimit == 0 {
return helper.ErrUnavailable(stream.Send(firstMessage))
}
sw := streamio.NewWriter(func(p []byte) error {
msg := &gitalypb.GetBlobResponse{}
if firstMessage != nil {
msg = firstMessage
firstMessage = nil
}
msg.Data = p
return stream.Send(msg)
})
_, err = io.CopyN(sw, blob, readLimit)
if err != nil {
return helper.ErrUnavailablef("GetBlob: send: %v", err)
}
return nil
}
func validateRequest(in *gitalypb.GetBlobRequest) error {
if len(in.GetOid()) == 0 {
return fmt.Errorf("empty Oid")
}
return nil
}
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