// submitBlock submits the passed block to network after ensuring it passes all
// of the consensus validation rules.
func (m *CPUMiner) submitBlock(block *dcrutil.Block) bool {
m.submitBlockLock.Lock()
defer m.submitBlockLock.Unlock()
_, latestHeight := m.server.blockManager.chainState.Best()
// Be sure to set this so ProcessBlock doesn't fail! - Decred
block.SetHeight(latestHeight + 1)
// Process this block using the same rules as blocks coming from other
// nodes. This will in turn relay it to the network like normal.
isOrphan, err := m.server.blockManager.ProcessBlock(block, blockchain.BFNone)
if err != nil {
// Anything other than a rule violation is an unexpected error,
// so log that error as an internal error.
if rErr, ok := err.(blockchain.RuleError); !ok {
minrLog.Errorf("Unexpected error while processing "+
"block submitted via CPU miner: %v", err)
return false
} else {
// Occasionally errors are given out for timing errors with
// ResetMinDifficulty and high block works that is above
// the target. Feed these to debug.
if m.server.chainParams.ResetMinDifficulty &&
rErr.ErrorCode == blockchain.ErrHighHash {
minrLog.Debugf("Block submitted via CPU miner rejected "+
"because of ResetMinDifficulty time sync failure: %v",
err)
return false
} else {
// Other rule errors should be reported.
minrLog.Errorf("Block submitted via CPU miner rejected: %v", err)
return false
}
}
}
if isOrphan {
minrLog.Errorf("Block submitted via CPU miner is an orphan building "+
"on parent %v", block.MsgBlock().Header.PrevBlock)
return false
}
// The block was accepted.
coinbaseTxOuts := block.MsgBlock().Transactions[0].TxOut
coinbaseTxGenerated := int64(0)
for _, out := range coinbaseTxOuts {
coinbaseTxGenerated += out.Value
}
minrLog.Infof("Block submitted via CPU miner accepted (hash %s, "+
"height %v, amount %v)",
block.Sha(),
block.Height(),
dcrutil.Amount(coinbaseTxGenerated))
return true
}
// loadReorgBlocks reads files containing decred block data (bzipped but
// otherwise in the format bitcoind writes) from disk and returns them as an
// array of dcrutil.Block. This is copied from the blockchain package, which
// itself largely borrowed it from the test code in this package.
func loadReorgBlocks(filename string) ([]*dcrutil.Block, error) {
filename = filepath.Join("../blockchain/testdata/", filename)
fi, err := os.Open(filename)
if err != nil {
return nil, err
}
bcStream := bzip2.NewReader(fi)
defer fi.Close()
// Create a buffer of the read file
bcBuf := new(bytes.Buffer)
bcBuf.ReadFrom(bcStream)
// Create decoder from the buffer and a map to store the data
bcDecoder := gob.NewDecoder(bcBuf)
blockchain := make(map[int64][]byte)
// Decode the blockchain into the map
if err := bcDecoder.Decode(&blockchain); err != nil {
return nil, err
}
var block *dcrutil.Block
blocks := make([]*dcrutil.Block, 0, len(blockchain))
for height := int64(0); height < int64(len(blockchain)); height++ {
block, err = dcrutil.NewBlockFromBytes(blockchain[height])
if err != nil {
return blocks, err
}
block.SetHeight(height)
blocks = append(blocks, block)
}
return blocks, nil
}
// 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:
// - BFDryRun: The memory chain index will not be pruned and no accept
// notification will be sent since the block is not being accepted.
//
// This function MUST be called with the chain state lock held (for writes).
func (b *BlockChain) maybeAcceptBlock(block *dcrutil.Block,
flags BehaviorFlags) (bool, error) {
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.Debugf("getPrevNodeFromBlock: %v", err)
return false, 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)
// The block must pass all of the validation rules which depend on the
// position of the block within the block chain.
err = b.checkBlockContext(block, prevNode, flags)
if err != nil {
return false, err
}
// Prune stake nodes and block nodes which are no longer needed before
// creating a new node.
if !dryRun {
err := b.pruner.pruneChainIfNeeded()
if err != nil {
return false, err
}
}
// 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, block.Sha(), blockHeight,
ticketsSpentInBlock(block), ticketsRevokedInBlock(block),
voteVersionsInBlock(block, b.chainParams))
if prevNode != nil {
newNode.parent = prevNode
newNode.height = blockHeight
newNode.workSum.Add(prevNode.workSum, newNode.workSum)
}
// Fetching a stake node could enable a new DoS vector, so restrict
// this only to blocks that are recent in history.
if newNode.height < b.bestNode.height-minMemoryNodes {
newNode.stakeNode, err = b.fetchStakeNode(newNode)
if err != nil {
return false, err
}
newNode.stakeUndoData = newNode.stakeNode.UndoData()
}
// Connect the passed block to the chain while respecting proper chain
// selection according to the chain with the most proof of work. This
// also handles validation of the transaction scripts.
var onMainChain bool
onMainChain, err = b.connectBestChain(newNode, block, flags)
if err != nil {
return false, err
}
// Notify the caller that the new block was accepted into the block
// chain. The caller would typically want to react by relaying the
// inventory to other peers.
if !dryRun {
b.chainLock.Unlock()
b.sendNotification(NTBlockAccepted,
&BlockAcceptedNtfnsData{onMainChain, block})
b.chainLock.Lock()
}
return onMainChain, nil
}
// 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:
// - 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 *dcrutil.Block,
flags BehaviorFlags) (bool, error) {
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.Debugf("getPrevNodeFromBlock: %v", err)
return false, 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)
// The block must pass all of the validation rules which depend on the
// position of the block within the block chain.
err = b.checkBlockContext(block, prevNode, flags)
if err != nil {
return false, err
}
// Prune block nodes which are no longer needed before creating
// a new node.
if !dryRun {
err = b.pruneBlockNodes()
if err != nil {
return false, err
}
}
// 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
var voteBitsStake []uint16
for _, stx := range block.STransactions() {
if is, _ := stake.IsSSGen(stx); is {
vb := stake.GetSSGenVoteBits(stx)
voteBitsStake = append(voteBitsStake, vb)
}
}
newNode := newBlockNode(blockHeader, block.Sha(), blockHeight, voteBitsStake)
if prevNode != nil {
newNode.parent = prevNode
newNode.height = blockHeight
newNode.workSum.Add(prevNode.workSum, newNode.workSum)
}
// Connect the passed block to the chain while respecting proper chain
// selection according to the chain with the most proof of work. This
// also handles validation of the transaction scripts.
var onMainChain bool
onMainChain, err = b.connectBestChain(newNode, block, flags)
if err != nil {
return false, err
}
// Notify the caller that the new block was accepted into the block
// chain. The caller would typically want to react by relaying the
// inventory to other peers.
if !dryRun {
b.sendNotification(NTBlockAccepted,
&BlockAcceptedNtfnsData{onMainChain, block})
}
return onMainChain, nil
}