Golang Block.SetHeight方法代码示例

// maybeAcceptBlock potentially accepts a block into the memory block chain.
// It performs several validation checks which depend on its position within
// the block chain before adding it.  The block is expected to have already gone
// through ProcessBlock before calling this function with it.
//
// The flags modify the behavior of this function as follows:
//  - BFFastAdd: The somewhat expensive BIP0034 validation is not performed.
//  - BFDryRun: The memory chain index will not be pruned and no accept
//    notification will be sent since the block is not being accepted.
func (b *BlockChain) maybeAcceptBlock(block *btcutil.Block, flags BehaviorFlags) error {
	fastAdd := flags&BFFastAdd == BFFastAdd
	dryRun := flags&BFDryRun == BFDryRun

	// Get a block node for the block previous to this one.  Will be nil
	// if this is the genesis block.
	prevNode, err := b.getPrevNodeFromBlock(block)
	if err != nil {
		log.Errorf("getPrevNodeFromBlock: %v", err)
		return err
	}

	// The height of this block is one more than the referenced previous
	// block.
	blockHeight := int64(0)
	if prevNode != nil {
		blockHeight = prevNode.height + 1
	}
	block.SetHeight(blockHeight)

	blockHeader := &block.MsgBlock().Header
	if !fastAdd {
		// Ensure the difficulty specified in the block header matches
		// the calculated difficulty based on the previous block and
		// difficulty retarget rules.
		expectedDifficulty, err := b.calcNextRequiredDifficulty(prevNode,
			block.MsgBlock().Header.Timestamp)
		if err != nil {
			return err
		}
		blockDifficulty := blockHeader.Bits
		if blockDifficulty != expectedDifficulty {
			str := "block difficulty of %d is not the expected value of %d"
			str = fmt.Sprintf(str, blockDifficulty, expectedDifficulty)
			return ruleError(ErrUnexpectedDifficulty, str)
		}

		// Ensure the timestamp for the block header is after the
		// median time of the last several blocks (medianTimeBlocks).
		medianTime, err := b.calcPastMedianTime(prevNode)
		if err != nil {
			log.Errorf("calcPastMedianTime: %v", err)
			return err
		}
		if !blockHeader.Timestamp.After(medianTime) {
			str := "block timestamp of %v is not after expected %v"
			str = fmt.Sprintf(str, blockHeader.Timestamp,
				medianTime)
			return ruleError(ErrTimeTooOld, str)
		}

		// Ensure all transactions in the block are finalized.
		for _, tx := range block.Transactions() {
			if !IsFinalizedTransaction(tx, blockHeight,
				blockHeader.Timestamp) {
				str := fmt.Sprintf("block contains "+
					"unfinalized transaction %v", tx.Sha())
				return ruleError(ErrUnfinalizedTx, str)
			}
		}

	}

	// Ensure chain matches up to predetermined checkpoints.
	// It's safe to ignore the error on Sha since it's already cached.
	blockHash, _ := block.Sha()
	if !b.verifyCheckpoint(blockHeight, blockHash) {
		str := fmt.Sprintf("block at height %d does not match "+
			"checkpoint hash", blockHeight)
		return ruleError(ErrBadCheckpoint, str)
	}

	// Find the previous checkpoint and prevent blocks which fork the main
	// chain before it.  This prevents storage of new, otherwise valid,
	// blocks which build off of old blocks that are likely at a much easier
	// difficulty and therefore could be used to waste cache and disk space.
	checkpointBlock, err := b.findPreviousCheckpoint()
	if err != nil {
		return err
	}
	if checkpointBlock != nil && blockHeight < checkpointBlock.Height() {
		str := fmt.Sprintf("block at height %d forks the main chain "+
			"before the previous checkpoint at height %d",
			blockHeight, checkpointBlock.Height())
		return ruleError(ErrForkTooOld, str)
	}

	if !fastAdd {
		// Reject version 1 blocks once a majority of the network has
		// upgraded.  This is part of BIP0034.
		if blockHeader.Version < 2 {
//.........这里部分代码省略.........