all: change chain head markers from block to header (#26777)

core/txpool/txpool.go

@@ -145,7 +145,7 @@ const (
 // blockChain provides the state of blockchain and current gas limit to do
 // some pre checks in tx pool and event subscribers.
 type blockChain interface {
-	CurrentBlock() *types.Block
+	CurrentBlock() *types.Header
 	GetBlock(hash common.Hash, number uint64) *types.Block
 	StateAt(root common.Hash) (*state.StateDB, error)
 
@@ -309,7 +309,7 @@ func NewTxPool(config Config, chainconfig *params.ChainConfig, chain blockChain)
 		pool.locals.add(addr)
 	}
 	pool.priced = newPricedList(pool.all)
-	pool.reset(nil, chain.CurrentBlock().Header())
+	pool.reset(nil, chain.CurrentBlock())
 
 	// Start the reorg loop early so it can handle requests generated during journal loading.
 	pool.wg.Add(1)
@@ -361,8 +361,8 @@ func (pool *TxPool) loop() {
 		// Handle ChainHeadEvent
 		case ev := <-pool.chainHeadCh:
 			if ev.Block != nil {
-				pool.requestReset(head.Header(), ev.Block.Header())
-				head = ev.Block
+				pool.requestReset(head, ev.Block.Header())
+				head = ev.Block.Header()
 			}
 
 		// System shutdown.
@@ -1291,7 +1291,7 @@ func (pool *TxPool) reset(oldHead, newHead *types.Header) {
 	}
 	// Initialize the internal state to the current head
 	if newHead == nil {
-		newHead = pool.chain.CurrentBlock().Header() // Special case during testing
+		newHead = pool.chain.CurrentBlock() // Special case during testing
 	}
 	statedb, err := pool.chain.StateAt(newHead.Root)
 	if err != nil {

core/txpool/txpool_test.go

@@ -64,14 +64,15 @@ type testBlockChain struct {
 	chainHeadFeed *event.Feed
 }
 
-func (bc *testBlockChain) CurrentBlock() *types.Block {
-	return types.NewBlock(&types.Header{
+func (bc *testBlockChain) CurrentBlock() *types.Header {
+	return &types.Header{
+		Number:   new(big.Int),
 		GasLimit: atomic.LoadUint64(&bc.gasLimit),
-	}, nil, nil, nil, trie.NewStackTrie(nil))
+	}
 }
 
 func (bc *testBlockChain) GetBlock(hash common.Hash, number uint64) *types.Block {
-	return bc.CurrentBlock()
+	return types.NewBlock(bc.CurrentBlock(), nil, nil, nil, trie.NewStackTrie(nil))
 }
 
 func (bc *testBlockChain) StateAt(common.Hash) (*state.StateDB, error) {