consensus, miner: stale block mining support (#17506)

* consensus, miner: stale block supporting

* consensus, miner: refactor seal signature

* cmd, consensus, eth: add miner noverify flag

* cmd, consensus, miner: polish

1 files changed, 6 insertions, 3 deletions

diff --git a/consensus/consensus.go b/consensus/consensus.go
index 27799f13c..12ede7ff4 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -86,9 +86,12 @@ type Engine interface {
 	Finalize(chain ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
 		uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error)
 
-	// Seal generates a new block for the given input block with the local miner's
-	// seal place on top.
-	Seal(chain ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error)
+	// Seal generates a new sealing request for the given input block and pushes
+	// the result into the given channel.
+	//
+	// Note, the method returns immediately and will send the result async. More
+	// than one result may also be returned depending on the consensus algorothm.
+	Seal(chain ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error
 
 	// SealHash returns the hash of a block prior to it being sealed.
 	SealHash(header *types.Header) common.Hash