77913ad2e8
This modifies the blockchain.ProcessBlock function to return an additional boolean as the first parameter which indicates whether or not the block ended up on the main chain. This is primarily useful for upcoming test code that needs to be able to tell the difference between a block accepted to a side chain and a block that either extends the main chain or causes a reorganize that causes it to become the main chain. However, it is also useful for the addblock utility since it allows a better error in the case a file with out of order blocks is provided.
87 lines
2.9 KiB
Go
87 lines
2.9 KiB
Go
// Copyright (c) 2013-2016 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 block chain and, if
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// accepted, returns whether or not it is on the main chain. It performs
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// several validation checks which depend on its position within the block chain
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// before adding it. The block is expected to have already gone through
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// 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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//
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// This function MUST be called with the chain state lock held (for writes).
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func (b *BlockChain) maybeAcceptBlock(block *btcutil.Block, flags BehaviorFlags) (bool, 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 false, 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 := int32(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 false, 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 false, 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.Hash(), 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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isMainChain, err := b.connectBestChain(newNode, block, flags)
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if err != nil {
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return false, 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.chainLock.Unlock()
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b.sendNotification(NTBlockAccepted, block)
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b.chainLock.Lock()
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}
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return isMainChain, nil
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}
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