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82 lines
2.6 KiB
82 lines
2.6 KiB
9 years ago
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// Copyright (c) 2013-2015 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package blockchain
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import "github.com/btcsuite/btcutil"
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// maybeAcceptBlock potentially accepts a block into the memory block chain.
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// It performs several validation checks which depend on its position within
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// the block chain before adding it. The block is expected to have already gone
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// through ProcessBlock before calling this function with it.
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//
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// The flags modify the behavior of this function as follows:
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// - BFDryRun: The memory chain index will not be pruned and no accept
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// notification will be sent since the block is not being accepted.
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//
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// The flags are also passed to checkBlockContext and connectBestChain. See
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// their documentation for how the flags modify their behavior.
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func (b *BlockChain) maybeAcceptBlock(block *btcutil.Block, flags BehaviorFlags) error {
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dryRun := flags&BFDryRun == BFDryRun
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// Get a block node for the block previous to this one. Will be nil
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// if this is the genesis block.
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prevNode, err := b.getPrevNodeFromBlock(block)
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if err != nil {
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log.Errorf("getPrevNodeFromBlock: %v", err)
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return err
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}
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// The height of this block is one more than the referenced previous
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// block.
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blockHeight := int64(0)
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if prevNode != nil {
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blockHeight = prevNode.height + 1
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}
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block.SetHeight(blockHeight)
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// The block must pass all of the validation rules which depend on the
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// position of the block within the block chain.
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err = b.checkBlockContext(block, prevNode, flags)
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if err != nil {
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return err
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}
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// Prune block nodes which are no longer needed before creating
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// a new node.
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if !dryRun {
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err = b.pruneBlockNodes()
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if err != nil {
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return err
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}
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}
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// Create a new block node for the block and add it to the in-memory
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// block chain (could be either a side chain or the main chain).
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blockHeader := &block.MsgBlock().Header
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newNode := newBlockNode(blockHeader, block.Sha(), blockHeight)
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if prevNode != nil {
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newNode.parent = prevNode
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newNode.height = blockHeight
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newNode.workSum.Add(prevNode.workSum, newNode.workSum)
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}
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// Connect the passed block to the chain while respecting proper chain
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// selection according to the chain with the most proof of work. This
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// also handles validation of the transaction scripts.
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err = b.connectBestChain(newNode, block, flags)
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if err != nil {
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return err
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}
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// Notify the caller that the new block was accepted into the block
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// chain. The caller would typically want to react by relaying the
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// inventory to other peers.
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if !dryRun {
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b.sendNotification(NTBlockAccepted, block)
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}
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return nil
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}
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