sync blobs in initial-sync (#12522)

consensus-types/blocks/roblock.go

@@ -5,6 +5,7 @@ import (
 	"sort"
 
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )
 
 // ROBlock is a value that embeds a ReadOnlySignedBeaconBlock along with its block root ([32]byte).
@@ -73,3 +74,44 @@ func (s ROBlockSlice) Swap(i, j int) {
 func (s ROBlockSlice) Len() int {
 	return len(s)
 }
+
+type BlockWithVerifiedBlobs struct {
+	Block ROBlock
+	Blobs []*eth.BlobSidecar
+}
+
+type BlockWithVerifiedBlobsSlice []BlockWithVerifiedBlobs
+
+func (s BlockWithVerifiedBlobsSlice) ROBlocks() []ROBlock {
+	r := make([]ROBlock, len(s))
+	for i := range s {
+		r[i] = s[i].Block
+	}
+	return r
+}
+
+// Less reports whether the element with index i must sort before the element with index j.
+// ROBlocks are ordered first by their slot,
+// with a lexicographic sort of roots breaking ties for slots with duplicate blocks.
+func (s BlockWithVerifiedBlobsSlice) Less(i, j int) bool {
+	si, sj := s[i].Block.Block().Slot(), s[j].Block.Block().Slot()
+
+	// lower slot wins
+	if si != sj {
+		return si < sj
+	}
+
+	// break slot tie lexicographically comparing roots byte for byte
+	ri, rj := s[i].Block.Root(), s[j].Block.Root()
+	return bytes.Compare(ri[:], rj[:]) < 0
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s BlockWithVerifiedBlobsSlice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+// Len is the number of elements in the collection.
+func (s BlockWithVerifiedBlobsSlice) Len() int {
+	return len(s)
+}