core, eth: split the db blocks into headers and bodies

eth/peer.go

@@ -184,6 +184,12 @@ func (p *peer) SendBlockBodies(bodies []*blockBody) error {
 	return p2p.Send(p.rw, BlockBodiesMsg, blockBodiesData(bodies))
 }
 
+// SendBlockBodiesRLP sends a batch of block contents to the remote peer from
+// an already RLP encoded format.
+func (p *peer) SendBlockBodiesRLP(bodies []*blockBodyRLP) error {
+	return p2p.Send(p.rw, BlockBodiesMsg, blockBodiesRLPData(bodies))
+}
+
 // SendNodeData sends a batch of arbitrary internal data, corresponding to the
 // hashes requested.
 func (p *peer) SendNodeData(data [][]byte) error {