blockchain: Add parent to blockNode constructor.

blockchain/accept.go

@@ -63,13 +63,8 @@ func (b *BlockChain) maybeAcceptBlock(block *btcutil.Block, flags BehaviorFlags)
 	// Create a new block node for the block and add it to the in-memory
 	// block chain (could be either a side chain or the main chain).
 	blockHeader := &block.MsgBlock().Header
-	newNode := newBlockNode(blockHeader, blockHeight)
+	newNode := newBlockNode(blockHeader, prevNode)
 	newNode.status = statusDataStored
-	if prevNode != nil {
-		newNode.parent = prevNode
-		newNode.height = blockHeight
-		newNode.workSum.Add(prevNode.workSum, newNode.workSum)
-	}
 	b.index.AddNode(newNode)
 
 	// Connect the passed block to the chain while respecting proper chain

blockchain/blockindex.go

@@ -101,33 +101,33 @@ type blockNode struct {
 	status blockStatus
 }
 
-// initBlockNode initializes a block node from the given header and height.  The
+// initBlockNode initializes a block node from the given header and parent node,
-// node is completely disconnected from the chain and the workSum value is just
+// calculating the height and workSum from the respective fields on the parent.
-// the work for the passed block.  The work sum must be updated accordingly when
-// the node is inserted into a chain.
-//
 // This function is NOT safe for concurrent access.  It must only be called when
 // initially creating a node.
-func initBlockNode(node *blockNode, blockHeader *wire.BlockHeader, height int32) {
+func initBlockNode(node *blockNode, blockHeader *wire.BlockHeader, parent *blockNode) {
 	*node = blockNode{
 		hash:       blockHeader.BlockHash(),
 		workSum:    CalcWork(blockHeader.Bits),
-		height:     height,
 		version:    blockHeader.Version,
 		bits:       blockHeader.Bits,
 		nonce:      blockHeader.Nonce,
 		timestamp:  blockHeader.Timestamp.Unix(),
 		merkleRoot: blockHeader.MerkleRoot,
 	}
+	if parent != nil {
+		node.parent = parent
+		node.height = parent.height + 1
+		node.workSum = node.workSum.Add(parent.workSum, node.workSum)
+	}
 }
 
-// newBlockNode returns a new block node for the given block header.  It is
+// newBlockNode returns a new block node for the given block header and parent
-// completely disconnected from the chain and the workSum value is just the work
+// node, calculating the height and workSum from the respective fields on the
-// for the passed block.  The work sum must be updated accordingly when the node
+// parent. This function is NOT safe for concurrent access.
-// is inserted into a chain.
+func newBlockNode(blockHeader *wire.BlockHeader, parent *blockNode) *blockNode {
-func newBlockNode(blockHeader *wire.BlockHeader, height int32) *blockNode {
 	var node blockNode
-	initBlockNode(&node, blockHeader, height)
+	initBlockNode(&node, blockHeader, parent)
 	return &node
 }
 

blockchain/chainio.go

@@ -1071,7 +1071,7 @@ func (b *BlockChain) createChainState() error {
 	genesisBlock := btcutil.NewBlock(b.chainParams.GenesisBlock)
 	genesisBlock.SetHeight(0)
 	header := &genesisBlock.MsgBlock().Header
-	node := newBlockNode(header, 0)
+	node := newBlockNode(header, nil)
 	node.status = statusDataStored | statusValid
 	b.bestChain.SetTip(node)
 
@@ -1216,36 +1216,37 @@ func (b *BlockChain) initChainState() error {
 				return err
 			}
 
-			// Initialize the block node for the block, connect it,
+			// Determine the parent block node. Since we iterate block headers
-			// and add it to the block index.
+			// in order of height, if the blocks are mostly linear there is a
-			node := &blockNodes[i]
+			// very good chance the previous header processed is the parent.
-			initBlockNode(node, &header, 0)
+			var parent *blockNode
-			node.status = statusDataStored | statusValid
 			if lastNode == nil {
-				if node.hash != *b.chainParams.GenesisHash {
+				blockHash := header.BlockHash()
+				if !blockHash.IsEqual(b.chainParams.GenesisHash) {
 					return AssertError(fmt.Sprintf("initChainState: Expected "+
 						"first entry in block index to be genesis block, "+
-						"found %s", header.BlockHash()))
+						"found %s", blockHash))
 				}
-			} else {
+			} else if header.PrevBlock == lastNode.hash {
 				// Since we iterate block headers in order of height, if the
 				// blocks are mostly linear there is a very good chance the
 				// previous header processed is the parent.
-				parent := lastNode
+				parent = lastNode
-				if header.PrevBlock != parent.hash {
+			} else {
-					parent = b.index.LookupNode(&header.PrevBlock)
+				parent = b.index.LookupNode(&header.PrevBlock)
-				}
 				if parent == nil {
 					return AssertError(fmt.Sprintf("initChainState: Could "+
 						"not find parent for block %s", header.BlockHash()))
 				}
-
-				node.parent = parent
-				node.height = parent.height + 1
-				node.workSum = node.workSum.Add(parent.workSum, node.workSum)
 			}
 
+			// Initialize the block node for the block, connect it,
+			// and add it to the block index.
+			node := &blockNodes[i]
+			initBlockNode(node, &header, parent)
+			node.status = statusDataStored | statusValid
 			b.index.AddNode(node)
+
 			lastNode = node
 			i++
 		}

blockchain/chainview_test.go

@@ -27,16 +27,11 @@ func chainedNodes(parent *blockNode, numNodes int) []*blockNode {
 		// This is invalid, but all that is needed is enough to get the
 		// synthetic tests to work.
 		header := wire.BlockHeader{Nonce: testNoncePrng.Uint32()}
-		height := int32(0)
 		if tip != nil {
 			header.PrevBlock = tip.hash
-			height = tip.height + 1
 		}
-		node := newBlockNode(&header, height)
+		nodes[i] = newBlockNode(&header, tip)
-		node.parent = tip
+		tip = nodes[i]
-		tip = node
-
-		nodes[i] = node
 	}
 	return nodes
 }

blockchain/common_test.go

@@ -261,7 +261,7 @@ func (b *BlockChain) TstSetCoinbaseMaturity(maturity uint16) {
 func newFakeChain(params *chaincfg.Params) *BlockChain {
 	// Create a genesis block node and block index index populated with it
 	// for use when creating the fake chain below.
-	node := newBlockNode(&params.GenesisBlock.Header, 0)
+	node := newBlockNode(&params.GenesisBlock.Header, nil)
 	index := newBlockIndex(nil, params)
 	index.AddNode(node)
 
@@ -291,8 +291,5 @@ func newFakeNode(parent *blockNode, blockVersion int32, bits uint32, timestamp t
 		Bits:      bits,
 		Timestamp: timestamp,
 	}
-	node := newBlockNode(header, parent.height+1)
+	return newBlockNode(header, parent)
-	node.parent = parent
-	node.workSum.Add(parent.workSum, node.workSum)
-	return node
 }

blockchain/validate.go

@@ -1274,8 +1274,6 @@ func (b *BlockChain) CheckConnectBlockTemplate(block *btcutil.Block) error {
 	// is not needed and thus extra work can be avoided.
 	view := NewUtxoViewpoint()
 	view.SetBestHash(&tip.hash)
-	newNode := newBlockNode(&header, tip.height+1)
+	newNode := newBlockNode(&header, tip)
-	newNode.parent = tip
-	newNode.workSum = newNode.workSum.Add(tip.workSum, newNode.workSum)
 	return b.checkConnectBlock(newNode, block, view, nil)
 }