// NewBlockTemplate returns a new block template that is ready to be solved
// using the transactions from the passed transaction source pool and a coinbase
// that either pays to the passed address if it is not nil, or a coinbase that
// is redeemable by anyone if the passed address is nil. The nil address
// functionality is useful since there are cases such as the getblocktemplate
// RPC where external mining software is responsible for creating their own
// coinbase which will replace the one generated for the block template. Thus
// the need to have configured address can be avoided.
//
// The transactions selected and included are prioritized according to several
// factors. First, each transaction has a priority calculated based on its
// value, age of inputs, and size. Transactions which consist of larger
// amounts, older inputs, and small sizes have the highest priority. Second, a
// fee per kilobyte is calculated for each transaction. Transactions with a
// higher fee per kilobyte are preferred. Finally, the block generation related
// policy settings are all taken into account.
//
// Transactions which only spend outputs from other transactions already in the
// block chain are immediately added to a priority queue which either
// prioritizes based on the priority (then fee per kilobyte) or the fee per
// kilobyte (then priority) depending on whether or not the BlockPrioritySize
// policy setting allots space for high-priority transactions. Transactions
// which spend outputs from other transactions in the source pool are added to a
// dependency map so they can be added to the priority queue once the
// transactions they depend on have been included.
//
// Once the high-priority area (if configured) has been filled with
// transactions, or the priority falls below what is considered high-priority,
// the priority queue is updated to prioritize by fees per kilobyte (then
// priority).
//
// When the fees per kilobyte drop below the TxMinFreeFee policy setting, the
// transaction will be skipped unless the BlockMinSize policy setting is
// nonzero, in which case the block will be filled with the low-fee/free
// transactions until the block size reaches that minimum size.
//
// Any transactions which would cause the block to exceed the BlockMaxSize
// policy setting, exceed the maximum allowed signature operations per block, or
// otherwise cause the block to be invalid are skipped.
//
// Given the above, a block generated by this function is of the following form:
//
// ----------------------------------- -- --
// | Coinbase Transaction | | |
// |-----------------------------------| | |
// | | | | ----- policy.BlockPrioritySize
// | High-priority Transactions | | |
// | | | |
// |-----------------------------------| | --
// | | |
// | | |
// | | |--- policy.BlockMaxSize
// | Transactions prioritized by fee | |
// | until <= policy.TxMinFreeFee | |
// | | |
// | | |
// | | |
// |-----------------------------------| |
// | Low-fee/Non high-priority (free) | |
// | transactions (while block size | |
// | <= policy.BlockMinSize) | |
// ----------------------------------- --
func (g *BlkTmplGenerator) NewBlockTemplate(payToAddress btcutil.Address) (*BlockTemplate, error) {
// Extend the most recently known best block.
best := g.chain.BestSnapshot()
prevHash := best.Hash
nextBlockHeight := best.Height + 1
// Create a standard coinbase transaction paying to the provided
// address. NOTE: The coinbase value will be updated to include the
// fees from the selected transactions later after they have actually
// been selected. It is created here to detect any errors early
// before potentially doing a lot of work below. The extra nonce helps
// ensure the transaction is not a duplicate transaction (paying the
// same value to the same public key address would otherwise be an
// identical transaction for block version 1).
extraNonce := uint64(0)
coinbaseScript, err := standardCoinbaseScript(nextBlockHeight, extraNonce)
if err != nil {
return nil, err
}
// TODO(roasbeef): add witnesss commitment output
coinbaseTx, err := createCoinbaseTx(g.chainParams, coinbaseScript,
nextBlockHeight, payToAddress)
if err != nil {
return nil, err
}
coinbaseSigOpCost := int64(blockchain.CountSigOps(coinbaseTx)) * blockchain.WitnessScaleFactor
// Get the current source transactions and create a priority queue to
// hold the transactions which are ready for inclusion into a block
// along with some priority related and fee metadata. Reserve the same
// number of items that are available for the priority queue. Also,
// choose the initial sort order for the priority queue based on whether
// or not there is an area allocated for high-priority transactions.
sourceTxns := g.txSource.MiningDescs()
sortedByFee := g.policy.BlockPrioritySize == 0
priorityQueue := newTxPriorityQueue(len(sourceTxns), sortedByFee)
// Create a slice to hold the transactions to be included in the
// generated block with reserved space. Also create a utxo view to
// house all of the input transactions so multiple lookups can be
// avoided.
blockTxns := make([]*btcutil.Tx, 0, len(sourceTxns))
blockTxns = append(blockTxns, coinbaseTx)
blockUtxos := blockchain.NewUtxoViewpoint()
// dependers is used to track transactions which depend on another
// transaction in the source pool. This, in conjunction with the
// dependsOn map kept with each dependent transaction helps quickly
// determine which dependent transactions are now eligible for inclusion
// in the block once each transaction has been included.
dependers := make(map[chainhash.Hash]map[chainhash.Hash]*txPrioItem)
// Create slices to hold the fees and number of signature operations
// for each of the selected transactions and add an entry for the
// coinbase. This allows the code below to simply append details about
// a transaction as it is selected for inclusion in the final block.
// However, since the total fees aren't known yet, use a dummy value for
// the coinbase fee which will be updated later.
txFees := make([]int64, 0, len(sourceTxns))
txSigOpCosts := make([]int64, 0, len(sourceTxns))
txFees = append(txFees, -1) // Updated once known
txSigOpCosts = append(txSigOpCosts, coinbaseSigOpCost)
log.Debugf("Considering %d transactions for inclusion to new block",
len(sourceTxns))
mempoolLoop:
for _, txDesc := range sourceTxns {
// A block can't have more than one coinbase or contain
// non-finalized transactions.
tx := txDesc.Tx
if blockchain.IsCoinBase(tx) {
log.Tracef("Skipping coinbase tx %s", tx.Hash())
continue
}
if !blockchain.IsFinalizedTransaction(tx, nextBlockHeight,
g.timeSource.AdjustedTime()) {
log.Tracef("Skipping non-finalized tx %s", tx.Hash())
continue
}
// Fetch all of the utxos referenced by the this transaction.
// NOTE: This intentionally does not fetch inputs from the
// mempool since a transaction which depends on other
// transactions in the mempool must come after those
// dependencies in the final generated block.
utxos, err := g.chain.FetchUtxoView(tx)
if err != nil {
log.Warnf("Unable to fetch utxo view for tx %s: %v",
tx.Hash(), err)
continue
}
// Setup dependencies for any transactions which reference
// other transactions in the mempool so they can be properly
// ordered below.
prioItem := &txPrioItem{tx: tx}
for _, txIn := range tx.MsgTx().TxIn {
originHash := &txIn.PreviousOutPoint.Hash
originIndex := txIn.PreviousOutPoint.Index
utxoEntry := utxos.LookupEntry(originHash)
if utxoEntry == nil || utxoEntry.IsOutputSpent(originIndex) {
if !g.txSource.HaveTransaction(originHash) {
log.Tracef("Skipping tx %s because it "+
"references unspent output %s "+
"which is not available",
tx.Hash(), txIn.PreviousOutPoint)
continue mempoolLoop
}
// The transaction is referencing another
// transaction in the source pool, so setup an
// ordering dependency.
deps, exists := dependers[*originHash]
if !exists {
deps = make(map[chainhash.Hash]*txPrioItem)
dependers[*originHash] = deps
}
deps[*prioItem.tx.Hash()] = prioItem
if prioItem.dependsOn == nil {
prioItem.dependsOn = make(
map[chainhash.Hash]struct{})
}
prioItem.dependsOn[*originHash] = struct{}{}
// Skip the check below. We already know the
// referenced transaction is available.
continue
}
}
// Calculate the final transaction priority using the input
// value age sum as well as the adjusted transaction size. The
// formula is: sum(inputValue * inputAge) / adjustedTxSize
prioItem.priority = CalcPriority(tx.MsgTx(), utxos,
nextBlockHeight)
// Calculate the fee in Satoshi/kB.
// TODO(roasbeef): cost accounting by weight
prioItem.feePerKB = txDesc.FeePerKB
prioItem.fee = txDesc.Fee
// Add the transaction to the priority queue to mark it ready
// for inclusion in the block unless it has dependencies.
if prioItem.dependsOn == nil {
heap.Push(priorityQueue, prioItem)
}
// Merge the referenced outputs from the input transactions to
// this transaction into the block utxo view. This allows the
// code below to avoid a second lookup.
mergeUtxoView(blockUtxos, utxos)
}
log.Tracef("Priority queue len %d, dependers len %d",
priorityQueue.Len(), len(dependers))
// The starting block size is the size of the block header plus the max
// possible transaction count size, plus the size of the coinbase
// transaction.
blockWeight := uint32((blockHeaderOverhead * blockchain.WitnessScaleFactor) +
blockchain.GetTransactionWeight(coinbaseTx))
blockSigOpCost := coinbaseSigOpCost
totalFees := int64(0)
// Query the version bits state to see if segwit has been activated, if
// so then this means that we'll include any transactions with witness
// data in the mempool, and also add the witness commitment as an
// OP_RETURN output in the coinbase transaction.
segwitState, err := g.chain.ThresholdState(chaincfg.DeploymentSegwit)
if err != nil {
return nil, err
}
segwitActive := segwitState == blockchain.ThresholdActive
witnessIncluded := false
// Choose which transactions make it into the block.
for priorityQueue.Len() > 0 {
// Grab the highest priority (or highest fee per kilobyte
// depending on the sort order) transaction.
prioItem := heap.Pop(priorityQueue).(*txPrioItem)
tx := prioItem.tx
switch {
// If segregated witness has not been activated yet, then we
// shouldn't include any witness transactions in the block.
case tx.MsgTx().HasWitness() && !segwitActive:
continue
// Otherwise, Keep track of if we've included a transaction
// with witness data or not. If so, then we'll need to include
// the witness commitment as the last output in the coinbase
// transaction.
case tx.MsgTx().HasWitness() && segwitActive:
// If we're about to include a transaction bearing
// witness data, then we'll also need to include a
// witness commitment in the coinbase transaction.
// Therefore, we account for the additional weight
// within the block.
if !witnessIncluded {
// First we account for the additional witness
// data in the witness nonce of the coinbaes
// transaction: 32-bytes of zeroes.
blockWeight += 2 + 32
// Next we account for the additional flag and
// marker bytes in the transaction
// serialization.
blockWeight += (1 + 1) * blockchain.WitnessScaleFactor
// Finally we account for the weight of the
// additional OP_RETURN output: 8-bytes (value)
// + 1-byte (var-int) + 38-bytes (pkScript),
// scaling up the weight as it's non-witness
// data.
blockWeight += (8 + 1 + 38) * blockchain.WitnessScaleFactor
}
witnessIncluded = true
}
// Grab any transactions which depend on this one.
deps := dependers[*tx.Hash()]
// Enforce maximum block size. Also check for overflow.
txWeight := uint32(blockchain.GetTransactionWeight(tx))
blockPlusTxWeight := uint32(blockWeight + txWeight)
if blockPlusTxWeight < blockWeight ||
blockPlusTxWeight >= g.policy.BlockMaxWeight {
log.Tracef("Skipping tx %s because it would exceed "+
"the max block weight", tx.Hash())
logSkippedDeps(tx, deps)
continue
}
// Enforce maximum signature operation cost per block. Also
// check for overflow.
sigOpCost, err := blockchain.GetSigOpCost(tx, false,
blockUtxos, true, segwitActive)
if err != nil {
log.Tracef("Skipping tx %s due to error in "+
"GetSigOpCost: %v", tx.Hash(), err)
logSkippedDeps(tx, deps)
continue
}
if blockSigOpCost+int64(sigOpCost) < blockSigOpCost ||
blockSigOpCost+int64(sigOpCost) > blockchain.MaxBlockSigOpsCost {
log.Tracef("Skipping tx %s because it would "+
"exceed the maximum sigops per block", tx.Hash())
logSkippedDeps(tx, deps)
continue
}
// Skip free transactions once the block is larger than the
// minimum block size.
if sortedByFee &&
prioItem.feePerKB < int64(g.policy.TxMinFreeFee) &&
blockPlusTxWeight >= g.policy.BlockMinWeight {
log.Tracef("Skipping tx %s with feePerKB %d "+
"< TxMinFreeFee %d and block weight %d >= "+
"minBlockWeight %d", tx.Hash(), prioItem.feePerKB,
g.policy.TxMinFreeFee, blockPlusTxWeight,
g.policy.BlockMinWeight)
logSkippedDeps(tx, deps)
continue
}
// Prioritize by fee per kilobyte once the block is larger than
// the priority size or there are no more high-priority
// transactions.
if !sortedByFee && (blockPlusTxWeight >= g.policy.BlockPrioritySize ||
prioItem.priority <= MinHighPriority) {
log.Tracef("Switching to sort by fees per "+
"kilobyte blockSize %d >= BlockPrioritySize "+
"%d || priority %.2f <= minHighPriority %.2f",
blockPlusTxWeight, g.policy.BlockPrioritySize,
prioItem.priority, MinHighPriority)
sortedByFee = true
priorityQueue.SetLessFunc(txPQByFee)
// Put the transaction back into the priority queue and
// skip it so it is re-priortized by fees if it won't
// fit into the high-priority section or the priority
// is too low. Otherwise this transaction will be the
// final one in the high-priority section, so just fall
// though to the code below so it is added now.
if blockPlusTxWeight > g.policy.BlockPrioritySize ||
prioItem.priority < MinHighPriority {
heap.Push(priorityQueue, prioItem)
continue
}
}
// Ensure the transaction inputs pass all of the necessary
// preconditions before allowing it to be added to the block.
_, err = blockchain.CheckTransactionInputs(tx, nextBlockHeight,
blockUtxos, g.chainParams)
if err != nil {
log.Tracef("Skipping tx %s due to error in "+
"CheckTransactionInputs: %v", tx.Hash(), err)
logSkippedDeps(tx, deps)
continue
}
err = blockchain.ValidateTransactionScripts(tx, blockUtxos,
txscript.StandardVerifyFlags, g.sigCache,
g.hashCache)
if err != nil {
log.Tracef("Skipping tx %s due to error in "+
"ValidateTransactionScripts: %v", tx.Hash(), err)
logSkippedDeps(tx, deps)
continue
}
// Spend the transaction inputs in the block utxo view and add
// an entry for it to ensure any transactions which reference
// this one have it available as an input and can ensure they
// aren't double spending.
spendTransaction(blockUtxos, tx, nextBlockHeight)
// Add the transaction to the block, increment counters, and
// save the fees and signature operation counts to the block
// template.
blockTxns = append(blockTxns, tx)
blockWeight += txWeight
blockSigOpCost += int64(sigOpCost)
totalFees += prioItem.fee
txFees = append(txFees, prioItem.fee)
txSigOpCosts = append(txSigOpCosts, int64(sigOpCost))
log.Tracef("Adding tx %s (priority %.2f, feePerKB %.2f)",
prioItem.tx.Hash(), prioItem.priority, prioItem.feePerKB)
// Add transactions which depend on this one (and also do not
// have any other unsatisified dependencies) to the priority
// queue.
for _, item := range deps {
// Add the transaction to the priority queue if there
// are no more dependencies after this one.
delete(item.dependsOn, *tx.Hash())
if len(item.dependsOn) == 0 {
heap.Push(priorityQueue, item)
}
}
}
// Now that the actual transactions have been selected, update the
// block weight for the real transaction count and coinbase value with
// the total fees accordingly.
blockWeight -= wire.MaxVarIntPayload -
(uint32(wire.VarIntSerializeSize(uint64(len(blockTxns)))) *
blockchain.WitnessScaleFactor)
coinbaseTx.MsgTx().TxOut[0].Value += totalFees
txFees[0] = -totalFees
// If segwit is active and we included transactions with witness data,
// then we'll need to include a commitment to the witness data in an
// OP_RETURN output within the coinbase transaction.
if witnessIncluded {
// The witness of the coinbase transaction MUST be exactly 32-bytes
// of all zeroes.
var witnessNonce [blockchain.CoinbaseWitnessDataLen]byte
coinbaseTx.MsgTx().TxIn[0].Witness = wire.TxWitness{witnessNonce[:]}
// Next, obtain the merkle root of a tree which consists of the
// wtxid of all transactions in the block. The coinbase
// transaction will have a special wtxid of all zeroes.
witnessMerkleTree := blockchain.BuildMerkleTreeStore(blockTxns,
true)
witnessMerkleRoot := witnessMerkleTree[len(witnessMerkleTree)-1]
// The preimage to the witness commitment is:
// witnessRoot || coinbaseWitness
var witnessPreimage [64]byte
copy(witnessPreimage[:32], witnessMerkleRoot[:])
copy(witnessPreimage[32:], witnessNonce[:])
// The witness commitment itself is the double-sha256 of the
// witness preimage generated above. With the commitment
// generated, the witness script for the output is: OP_RETURN
// OP_DATA_36 {0xaa21a9ed || witnessCommitment}. The leading
// prefix is refered to as the "witness magic bytes".
witnessCommitment := chainhash.DoubleHashB(witnessPreimage[:])
witnessScript := append(blockchain.WitnessMagicBytes, witnessCommitment...)
// Finally, create the OP_RETURN carrying witness commitment
// output as an additional output within the coinbase.
commitmentOutput := &wire.TxOut{
Value: 0,
PkScript: witnessScript,
}
coinbaseTx.MsgTx().TxOut = append(coinbaseTx.MsgTx().TxOut,
commitmentOutput)
}
// Calculate the required difficulty for the block. The timestamp
// is potentially adjusted to ensure it comes after the median time of
// the last several blocks per the chain consensus rules.
ts := medianAdjustedTime(best, g.timeSource)
reqDifficulty, err := g.chain.CalcNextRequiredDifficulty(ts)
if err != nil {
return nil, err
}
// Calculate the next expected block version based on the state of the
// rule change deployments.
nextBlockVersion, err := g.chain.CalcNextBlockVersion()
if err != nil {
return nil, err
}
// Create a new block ready to be solved.
merkles := blockchain.BuildMerkleTreeStore(blockTxns, false)
var msgBlock wire.MsgBlock
msgBlock.Header = wire.BlockHeader{
Version: nextBlockVersion,
PrevBlock: *prevHash,
MerkleRoot: *merkles[len(merkles)-1],
Timestamp: ts,
Bits: reqDifficulty,
}
for _, tx := range blockTxns {
if err := msgBlock.AddTransaction(tx.MsgTx()); err != nil {
return nil, err
}
}
// Finally, perform a full check on the created block against the chain
// consensus rules to ensure it properly connects to the current best
// chain with no issues.
block := btcutil.NewBlock(&msgBlock)
block.SetHeight(nextBlockHeight)
if err := g.chain.CheckConnectBlock(block); err != nil {
return nil, err
}
log.Debugf("Created new block template (%d transactions, %d in "+
"fees, %d signature operations cost, %d weight, target difficulty "+
"%064x)", len(msgBlock.Transactions), totalFees, blockSigOpCost,
blockWeight, blockchain.CompactToBig(msgBlock.Header.Bits))
return &BlockTemplate{
Block: &msgBlock,
Fees: txFees,
SigOpCosts: txSigOpCosts,
Height: nextBlockHeight,
ValidPayAddress: payToAddress != nil,
}, nil
}
// BlockRootOK checks for block self-consistency.
// If the block has no wintess txs, and no coinbase witness commitment,
// it only checks the tx merkle root. If either a witness commitment or
// any witnesses are detected, it also checks that as well.
// Returns false if anything goes wrong, true if everything is fine.
func BlockOK(blk wire.MsgBlock) bool {
var txids, wtxids []*wire.ShaHash // txids and wtxids
// witMode true if any tx has a wintess OR coinbase has wit commit
var witMode bool
for _, tx := range blk.Transactions { // make slice of (w)/txids
txid := tx.TxSha()
wtxid := tx.WitnessHash()
if !witMode && !txid.IsEqual(&wtxid) {
witMode = true
}
txids = append(txids, &txid)
wtxids = append(wtxids, &wtxid)
}
var commitBytes []byte
// try to extract coinbase witness commitment (even if !witMode)
cb := blk.Transactions[0] // get coinbase tx
for i := len(cb.TxOut) - 1; i >= 0; i-- { // start at the last txout
if bytes.HasPrefix(cb.TxOut[i].PkScript, WitMagicBytes) &&
len(cb.TxOut[i].PkScript) > 37 {
// 38 bytes or more, and starts with WitMagicBytes is a hit
commitBytes = cb.TxOut[i].PkScript[6:38]
witMode = true // it there is a wit commit it must be valid
}
}
if witMode { // witmode, so check witness tree
// first find ways witMode can be disqualified
if len(commitBytes) != 32 {
// witness in block but didn't find a wintess commitment; fail
log.Printf("block %s has witness but no witcommit",
blk.BlockSha().String())
return false
}
if len(cb.TxIn) != 1 {
log.Printf("block %s coinbase tx has %d txins (must be 1)",
blk.BlockSha().String(), len(cb.TxIn))
return false
}
if len(cb.TxIn[0].Witness) != 1 {
log.Printf("block %s coinbase has %d witnesses (must be 1)",
blk.BlockSha().String(), len(cb.TxIn[0].Witness))
return false
}
if len(cb.TxIn[0].Witness[0]) != 32 {
log.Printf("block %s coinbase has %d byte witness nonce (not 32)",
blk.BlockSha().String(), len(cb.TxIn[0].Witness[0]))
return false
}
// witness nonce is the cb's witness, subject to above constraints
witNonce, err := wire.NewShaHash(cb.TxIn[0].Witness[0])
if err != nil {
log.Printf("Witness nonce error: %s", err.Error())
return false // not sure why that'd happen but fail
}
var empty [32]byte
wtxids[0].SetBytes(empty[:]) // coinbase wtxid is 0x00...00
// witness root calculated from wtixds
witRoot := calcRoot(wtxids)
calcWitCommit := wire.DoubleSha256SH(
append(witRoot.Bytes(), witNonce.Bytes()...))
// witness root given in coinbase op_return
givenWitCommit, err := wire.NewShaHash(commitBytes)
if err != nil {
log.Printf("Witness root error: %s", err.Error())
return false // not sure why that'd happen but fail
}
// they should be the same. If not, fail.
if !calcWitCommit.IsEqual(givenWitCommit) {
log.Printf("Block %s witRoot error: calc %s given %s",
blk.BlockSha().String(),
calcWitCommit.String(), givenWitCommit.String())
return false
}
}
// got through witMode check so that should be OK;
// check regular txid merkleroot. Which is, like, trivial.
return blk.Header.MerkleRoot.IsEqual(calcRoot(txids))
}
// CreateBlock creates a new block building from the previous block with a
// specified blockversion and timestamp. If the timestamp passed is zero (not
// initialized), then the timestamp of the previous block will be used plus 1
// second is used. Passing nil for the previous block results in a block that
// builds off of the genesis block for the specified chain.
func CreateBlock(prevBlock *btcutil.Block, inclusionTxs []*btcutil.Tx,
blockVersion int32, blockTime time.Time,
miningAddr btcutil.Address, net *chaincfg.Params) (*btcutil.Block, error) {
var (
prevHash *chainhash.Hash
blockHeight int32
prevBlockTime time.Time
)
// If the previous block isn't specified, then we'll construct a block
// that builds off of the genesis block for the chain.
if prevBlock == nil {
prevHash = net.GenesisHash
blockHeight = 1
prevBlockTime = net.GenesisBlock.Header.Timestamp.Add(time.Minute)
} else {
prevHash = prevBlock.Hash()
blockHeight = prevBlock.Height() + 1
prevBlockTime = prevBlock.MsgBlock().Header.Timestamp
}
// If a target block time was specified, then use that as the header's
// timestamp. Otherwise, add one second to the previous block unless
// it's the genesis block in which case use the current time.
var ts time.Time
switch {
case !blockTime.IsZero():
ts = blockTime
default:
ts = prevBlockTime.Add(time.Second)
}
extraNonce := uint64(0)
coinbaseScript, err := standardCoinbaseScript(blockHeight, extraNonce)
if err != nil {
return nil, err
}
coinbaseTx, err := createCoinbaseTx(coinbaseScript, blockHeight,
miningAddr, net)
if err != nil {
return nil, err
}
// Create a new block ready to be solved.
blockTxns := []*btcutil.Tx{coinbaseTx}
if inclusionTxs != nil {
blockTxns = append(blockTxns, inclusionTxs...)
}
merkles := blockchain.BuildMerkleTreeStore(blockTxns, false)
var block wire.MsgBlock
block.Header = wire.BlockHeader{
Version: blockVersion,
PrevBlock: *prevHash,
MerkleRoot: *merkles[len(merkles)-1],
Timestamp: ts,
Bits: net.PowLimitBits,
}
for _, tx := range blockTxns {
if err := block.AddTransaction(tx.MsgTx()); err != nil {
return nil, err
}
}
found := solveBlock(&block.Header, net.PowLimit)
if !found {
return nil, errors.New("Unable to solve block")
}
utilBlock := btcutil.NewBlock(&block)
utilBlock.SetHeight(blockHeight)
return utilBlock, nil
}
// IngestBlock is like IngestMerkleBlock but aralphic
// different enough that it's better to have 2 separate functions
func (s *SPVCon) IngestBlock(m *wire.MsgBlock) {
var err error
// var buf bytes.Buffer
// m.SerializeWitness(&buf)
// fmt.Printf("block hex %x\n", buf.Bytes())
// for _, tx := range m.Transactions {
// fmt.Printf("wtxid: %s\n", tx.WTxSha())
// fmt.Printf(" txid: %s\n", tx.TxSha())
// fmt.Printf("%d %s", i, TxToString(tx))
// }
ok := BlockOK(*m) // check block self-consistency
if !ok {
fmt.Printf("block %s not OK!!11\n", m.BlockSha().String())
return
}
var hah HashAndHeight
select { // select here so we don't block on an unrequested mblock
case hah = <-s.blockQueue: // pop height off mblock queue
break
default:
log.Printf("Unrequested full block")
return
}
newBlockSha := m.Header.BlockSha()
if !hah.blockhash.IsEqual(&newBlockSha) {
log.Printf("full block out of order error")
return
}
fPositive := 0 // local filter false positives
reFilter := 10 // after that many false positives, regenerate filter.
// 10? Making it up. False positives have disk i/o cost, and regenning
// the filter also has costs. With a large local filter, false positives
// should be rare.
// iterate through all txs in the block, looking for matches.
// use a local bloom filter to ignore txs that don't affect us
for _, tx := range m.Transactions {
utilTx := btcutil.NewTx(tx)
if s.TS.localFilter.MatchTxAndUpdate(utilTx) {
hits, err := s.TS.Ingest(tx, hah.height)
if err != nil {
log.Printf("Incoming Tx error: %s\n", err.Error())
return
}
if hits > 0 {
// log.Printf("block %d tx %d %s ingested and matches %d utxo/adrs.",
// hah.height, i, tx.TxSha().String(), hits)
} else {
fPositive++ // matched filter but no hits
}
}
}
if fPositive > reFilter {
fmt.Printf("%d filter false positives in this block\n", fPositive)
err = s.TS.Refilter()
if err != nil {
log.Printf("Refilter error: %s\n", err.Error())
return
}
}
// write to db that we've sync'd to the height indicated in the
// merkle block. This isn't QUITE true since we haven't actually gotten
// the txs yet but if there are problems with the txs we should backtrack.
err = s.TS.SetDBSyncHeight(hah.height)
if err != nil {
log.Printf("full block sync error: %s\n", err.Error())
return
}
fmt.Printf("ingested full block %s height %d OK\n",
m.Header.BlockSha().String(), hah.height)
if hah.final { // check sync end
// don't set waitstate; instead, ask for headers again!
// this way the only thing that triggers waitstate is asking for headers,
// getting 0, calling AskForMerkBlocks(), and seeing you don't need any.
// that way you are pretty sure you're synced up.
err = s.AskForHeaders()
if err != nil {
log.Printf("Merkle block error: %s\n", err.Error())
return
}
}
return
}
// TestFullBlocks ensures all tests generated by the fullblocktests package
// have the expected result when processed via ProcessBlock.
func TestFullBlocks(t *testing.T) {
tests, err := fullblocktests.Generate(false)
if err != nil {
t.Fatalf("failed to generate tests: %v", err)
}
// Create a new database and chain instance to run tests against.
chain, teardownFunc, err := chainSetup("fullblocktest",
&chaincfg.RegressionNetParams)
if err != nil {
t.Errorf("Failed to setup chain instance: %v", err)
return
}
defer teardownFunc()
// testAcceptedBlock attempts to process the block in the provided test
// instance and ensures that it was accepted according to the flags
// specified in the test.
testAcceptedBlock := func(item fullblocktests.AcceptedBlock) {
blockHeight := item.Height
block := btcutil.NewBlock(item.Block)
block.SetHeight(blockHeight)
t.Logf("Testing block %s (hash %s, height %d)",
item.Name, block.Hash(), blockHeight)
isMainChain, isOrphan, err := chain.ProcessBlock(block,
blockchain.BFNone)
if err != nil {
t.Fatalf("block %q (hash %s, height %d) should "+
"have been accepted: %v", item.Name,
block.Hash(), blockHeight, err)
}
// Ensure the main chain and orphan flags match the values
// specified in the test.
if isMainChain != item.IsMainChain {
t.Fatalf("block %q (hash %s, height %d) unexpected main "+
"chain flag -- got %v, want %v", item.Name,
block.Hash(), blockHeight, isMainChain,
item.IsMainChain)
}
if isOrphan != item.IsOrphan {
t.Fatalf("block %q (hash %s, height %d) unexpected "+
"orphan flag -- got %v, want %v", item.Name,
block.Hash(), blockHeight, isOrphan,
item.IsOrphan)
}
}
// testRejectedBlock attempts to process the block in the provided test
// instance and ensures that it was rejected with the reject code
// specified in the test.
testRejectedBlock := func(item fullblocktests.RejectedBlock) {
blockHeight := item.Height
block := btcutil.NewBlock(item.Block)
block.SetHeight(blockHeight)
t.Logf("Testing block %s (hash %s, height %d)",
item.Name, block.Hash(), blockHeight)
_, _, err := chain.ProcessBlock(block, blockchain.BFNone)
if err == nil {
t.Fatalf("block %q (hash %s, height %d) should not "+
"have been accepted", item.Name, block.Hash(),
blockHeight)
}
// Ensure the error code is of the expected type and the reject
// code matches the value specified in the test instance.
rerr, ok := err.(blockchain.RuleError)
if !ok {
t.Fatalf("block %q (hash %s, height %d) returned "+
"unexpected error type -- got %T, want "+
"blockchain.RuleError", item.Name, block.Hash(),
blockHeight, err)
}
if rerr.ErrorCode != item.RejectCode {
t.Fatalf("block %q (hash %s, height %d) does not have "+
"expected reject code -- got %v, want %v",
item.Name, block.Hash(), blockHeight,
rerr.ErrorCode, item.RejectCode)
}
}
// testRejectedNonCanonicalBlock attempts to decode the block in the
// provided test instance and ensures that it failed to decode with a
// message error.
testRejectedNonCanonicalBlock := func(item fullblocktests.RejectedNonCanonicalBlock) {
headerLen := len(item.RawBlock)
if headerLen > 80 {
headerLen = 80
}
blockHash := chainhash.DoubleHashH(item.RawBlock[0:headerLen])
blockHeight := item.Height
t.Logf("Testing block %s (hash %s, height %d)", item.Name,
blockHash, blockHeight)
// Ensure there is an error due to deserializing the block.
var msgBlock wire.MsgBlock
err := msgBlock.BtcDecode(bytes.NewReader(item.RawBlock), 0, wire.BaseEncoding)
if _, ok := err.(*wire.MessageError); !ok {
t.Fatalf("block %q (hash %s, height %d) should have "+
"failed to decode", item.Name, blockHash,
blockHeight)
}
}
// testOrphanOrRejectedBlock attempts to process the block in the
// provided test instance and ensures that it was either accepted as an
// orphan or rejected with a rule violation.
testOrphanOrRejectedBlock := func(item fullblocktests.OrphanOrRejectedBlock) {
blockHeight := item.Height
block := btcutil.NewBlock(item.Block)
block.SetHeight(blockHeight)
t.Logf("Testing block %s (hash %s, height %d)",
item.Name, block.Hash(), blockHeight)
_, isOrphan, err := chain.ProcessBlock(block, blockchain.BFNone)
if err != nil {
// Ensure the error code is of the expected type.
if _, ok := err.(blockchain.RuleError); !ok {
t.Fatalf("block %q (hash %s, height %d) "+
"returned unexpected error type -- "+
"got %T, want blockchain.RuleError",
item.Name, block.Hash(), blockHeight,
err)
}
}
if !isOrphan {
t.Fatalf("block %q (hash %s, height %d) was accepted, "+
"but is not considered an orphan", item.Name,
block.Hash(), blockHeight)
}
}
// testExpectedTip ensures the current tip of the blockchain is the
// block specified in the provided test instance.
testExpectedTip := func(item fullblocktests.ExpectedTip) {
blockHeight := item.Height
block := btcutil.NewBlock(item.Block)
block.SetHeight(blockHeight)
t.Logf("Testing tip for block %s (hash %s, height %d)",
item.Name, block.Hash(), blockHeight)
// Ensure hash and height match.
best := chain.BestSnapshot()
if *best.Hash != item.Block.BlockHash() ||
best.Height != blockHeight {
t.Fatalf("block %q (hash %s, height %d) should be "+
"the current tip -- got (hash %s, height %d)",
item.Name, block.Hash(), blockHeight, best.Hash,
best.Height)
}
}
for testNum, test := range tests {
for itemNum, item := range test {
switch item := item.(type) {
case fullblocktests.AcceptedBlock:
testAcceptedBlock(item)
case fullblocktests.RejectedBlock:
testRejectedBlock(item)
case fullblocktests.RejectedNonCanonicalBlock:
testRejectedNonCanonicalBlock(item)
case fullblocktests.OrphanOrRejectedBlock:
testOrphanOrRejectedBlock(item)
case fullblocktests.ExpectedTip:
testExpectedTip(item)
default:
t.Fatalf("test #%d, item #%d is not one of "+
"the supported test instance types -- "+
"got type: %T", testNum, itemNum, item)
}
}
}
}