コード例 #1
0
ファイル: bench_test.go プロジェクト: Roasbeef/btcd
// BenchmarkIsCoinBase performs a simple benchmark against the IsCoinBase
// function.
func BenchmarkIsCoinBase(b *testing.B) {
	tx, _ := btcutil.NewBlock(&Block100000).Tx(1)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		blockchain.IsCoinBase(tx)
	}
}
コード例 #2
0
ファイル: rpc_harness.go プロジェクト: Roasbeef/btcd
// GenerateAndSubmitBlock creates a block whose contents include the passed
// transactions and submits it to the running simnet node. For generating
// blocks with only a coinbase tx, callers can simply pass nil instead of
// transactions to be mined. Additionally, a custom block version can be set by
// the caller. A blockVersion of -1 indicates that the current default block
// version should be used. An uninitialized time.Time should be used for the
// blockTime parameter if one doesn't wish to set a custom time.
//
// This function is safe for concurrent access.
func (h *Harness) GenerateAndSubmitBlock(txns []*btcutil.Tx, blockVersion int32,
	blockTime time.Time) (*btcutil.Block, error) {

	h.Lock()
	defer h.Unlock()

	if blockVersion == -1 {
		blockVersion = BlockVersion
	}

	prevBlockHash, prevBlockHeight, err := h.Node.GetBestBlock()
	if err != nil {
		return nil, err
	}
	mBlock, err := h.Node.GetBlock(prevBlockHash)
	if err != nil {
		return nil, err
	}
	prevBlock := btcutil.NewBlock(mBlock)
	prevBlock.SetHeight(prevBlockHeight)

	// Create a new block including the specified transactions
	newBlock, err := CreateBlock(prevBlock, txns, blockVersion,
		blockTime, h.wallet.coinbaseAddr, h.ActiveNet)
	if err != nil {
		return nil, err
	}

	// Submit the block to the simnet node.
	if err := h.Node.SubmitBlock(newBlock, nil); err != nil {
		return nil, err
	}

	return newBlock, nil
}
コード例 #3
0
ファイル: merkle_test.go プロジェクト: Roasbeef/btcd
// TestMerkle tests the BuildMerkleTreeStore API.
func TestMerkle(t *testing.T) {
	block := btcutil.NewBlock(&Block100000)
	merkles := blockchain.BuildMerkleTreeStore(block.Transactions(), false)
	calculatedMerkleRoot := merkles[len(merkles)-1]
	wantMerkle := &Block100000.Header.MerkleRoot
	if !wantMerkle.IsEqual(calculatedMerkleRoot) {
		t.Errorf("BuildMerkleTreeStore: merkle root mismatch - "+
			"got %v, want %v", calculatedMerkleRoot, wantMerkle)
	}
}
コード例 #4
0
ファイル: example_test.go プロジェクト: Roasbeef/btcd
// This example demonstrates how to create a new chain instance and use
// ProcessBlock to attempt to attempt add a block to the chain.  As the package
// overview documentation describes, this includes all of the Bitcoin consensus
// rules.  This example intentionally attempts to insert a duplicate genesis
// block to illustrate how an invalid block is handled.
func ExampleBlockChain_ProcessBlock() {
	// Create a new database to store the accepted blocks into.  Typically
	// this would be opening an existing database and would not be deleting
	// and creating a new database like this, but it is done here so this is
	// a complete working example and does not leave temporary files laying
	// around.
	dbPath := filepath.Join(os.TempDir(), "exampleprocessblock")
	_ = os.RemoveAll(dbPath)
	db, err := database.Create("ffldb", dbPath, chaincfg.MainNetParams.Net)
	if err != nil {
		fmt.Printf("Failed to create database: %v\n", err)
		return
	}
	defer os.RemoveAll(dbPath)
	defer db.Close()

	// Create a new BlockChain instance using the underlying database for
	// the main bitcoin network.  This example does not demonstrate some
	// of the other available configuration options such as specifying a
	// notification callback and signature cache.  Also, the caller would
	// ordinarily keep a reference to the median time source and add time
	// values obtained from other peers on the network so the local time is
	// adjusted to be in agreement with other peers.
	chain, err := blockchain.New(&blockchain.Config{
		DB:          db,
		ChainParams: &chaincfg.MainNetParams,
		TimeSource:  blockchain.NewMedianTime(),
	})
	if err != nil {
		fmt.Printf("Failed to create chain instance: %v\n", err)
		return
	}

	// Process a block.  For this example, we are going to intentionally
	// cause an error by trying to process the genesis block which already
	// exists.
	genesisBlock := btcutil.NewBlock(chaincfg.MainNetParams.GenesisBlock)
	isMainChain, isOrphan, err := chain.ProcessBlock(genesisBlock,
		blockchain.BFNone)
	if err != nil {
		fmt.Printf("Failed to process block: %v\n", err)
		return
	}
	fmt.Printf("Block accepted. Is it on the main chain?: %v", isMainChain)
	fmt.Printf("Block accepted. Is it an orphan?: %v", isOrphan)

	// Output:
	// Failed to process block: already have block 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
}
コード例 #5
0
ファイル: validate_test.go プロジェクト: Roasbeef/btcd
// TestCheckConnectBlock tests the CheckConnectBlock function to ensure it
// fails.
func TestCheckConnectBlock(t *testing.T) {
	// Create a new database and chain instance to run tests against.
	chain, teardownFunc, err := chainSetup("checkconnectblock",
		&chaincfg.MainNetParams)
	if err != nil {
		t.Errorf("Failed to setup chain instance: %v", err)
		return
	}
	defer teardownFunc()

	// The genesis block should fail to connect since it's already inserted.
	genesisBlock := chaincfg.MainNetParams.GenesisBlock
	err = chain.CheckConnectBlock(btcutil.NewBlock(genesisBlock))
	if err == nil {
		t.Errorf("CheckConnectBlock: Did not received expected error")
	}
}
コード例 #6
0
ファイル: validate_test.go プロジェクト: Roasbeef/btcd
// TestCheckBlockSanity tests the CheckBlockSanity function to ensure it works
// as expected.
func TestCheckBlockSanity(t *testing.T) {
	powLimit := chaincfg.MainNetParams.PowLimit
	block := btcutil.NewBlock(&Block100000)
	timeSource := blockchain.NewMedianTime()
	err := blockchain.CheckBlockSanity(block, powLimit, timeSource)
	if err != nil {
		t.Errorf("CheckBlockSanity: %v", err)
	}

	// Ensure a block that has a timestamp with a precision higher than one
	// second fails.
	timestamp := block.MsgBlock().Header.Timestamp
	block.MsgBlock().Header.Timestamp = timestamp.Add(time.Nanosecond)
	err = blockchain.CheckBlockSanity(block, powLimit, timeSource)
	if err == nil {
		t.Errorf("CheckBlockSanity: error is nil when it shouldn't be")
	}
}
コード例 #7
0
ファイル: bench_test.go プロジェクト: Roasbeef/btcd
// BenchmarkBlockHeader benchmarks how long it takes to load the mainnet genesis
// block.
func BenchmarkBlock(b *testing.B) {
	// Start by creating a new database and populating it with the mainnet
	// genesis block.
	dbPath := filepath.Join(os.TempDir(), "ffldb-benchblk")
	_ = os.RemoveAll(dbPath)
	db, err := database.Create("ffldb", dbPath, blockDataNet)
	if err != nil {
		b.Fatal(err)
	}
	defer os.RemoveAll(dbPath)
	defer db.Close()
	err = db.Update(func(tx database.Tx) error {
		block := btcutil.NewBlock(chaincfg.MainNetParams.GenesisBlock)
		return tx.StoreBlock(block)
	})
	if err != nil {
		b.Fatal(err)
	}

	b.ReportAllocs()
	b.ResetTimer()
	err = db.View(func(tx database.Tx) error {
		blockHash := chaincfg.MainNetParams.GenesisHash
		for i := 0; i < b.N; i++ {
			_, err := tx.FetchBlock(blockHash)
			if err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		b.Fatal(err)
	}

	// Don't benchmark teardown.
	b.StopTimer()
}
コード例 #8
0
ファイル: mining.go プロジェクト: Roasbeef/btcd
// UpdateExtraNonce updates the extra nonce in the coinbase script of the passed
// block by regenerating the coinbase script with the passed value and block
// height.  It also recalculates and updates the new merkle root that results
// from changing the coinbase script.
func (g *BlkTmplGenerator) UpdateExtraNonce(msgBlock *wire.MsgBlock, blockHeight int32, extraNonce uint64) error {
	coinbaseScript, err := standardCoinbaseScript(blockHeight, extraNonce)
	if err != nil {
		return err
	}
	if len(coinbaseScript) > blockchain.MaxCoinbaseScriptLen {
		return fmt.Errorf("coinbase transaction script length "+
			"of %d is out of range (min: %d, max: %d)",
			len(coinbaseScript), blockchain.MinCoinbaseScriptLen,
			blockchain.MaxCoinbaseScriptLen)
	}
	msgBlock.Transactions[0].TxIn[0].SignatureScript = coinbaseScript

	// TODO(davec): A btcutil.Block should use saved in the state to avoid
	// recalculating all of the other transaction hashes.
	// block.Transactions[0].InvalidateCache()

	// Recalculate the merkle root with the updated extra nonce.
	block := btcutil.NewBlock(msgBlock)
	merkles := blockchain.BuildMerkleTreeStore(block.Transactions(), false)
	msgBlock.Header.MerkleRoot = *merkles[len(merkles)-1]
	return nil
}
コード例 #9
0
ファイル: blockgen.go プロジェクト: Roasbeef/btcd
// 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
}
コード例 #10
0
ファイル: mining.go プロジェクト: Roasbeef/btcd
// 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
}
コード例 #11
0
ファイル: example_test.go プロジェクト: Roasbeef/btcd
// This example demonstrates creating a new database, using a managed read-write
// transaction to store a block, and using a managed read-only transaction to
// fetch the block.
func Example_blockStorageAndRetrieval() {
	// This example assumes the ffldb driver is imported.
	//
	// import (
	// 	"github.com/roasbeef/btcd/database"
	// 	_ "github.com/roasbeef/btcd/database/ffldb"
	// )

	// Create a database and schedule it to be closed and removed on exit.
	// Typically you wouldn't want to remove the database right away like
	// this, nor put it in the temp directory, but it's done here to ensure
	// the example cleans up after itself.
	dbPath := filepath.Join(os.TempDir(), "exampleblkstorage")
	db, err := database.Create("ffldb", dbPath, wire.MainNet)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer os.RemoveAll(dbPath)
	defer db.Close()

	// Use the Update function of the database to perform a managed
	// read-write transaction and store a genesis block in the database as
	// and example.
	err = db.Update(func(tx database.Tx) error {
		genesisBlock := chaincfg.MainNetParams.GenesisBlock
		return tx.StoreBlock(btcutil.NewBlock(genesisBlock))
	})
	if err != nil {
		fmt.Println(err)
		return
	}

	// Use the View function of the database to perform a managed read-only
	// transaction and fetch the block stored above.
	var loadedBlockBytes []byte
	err = db.Update(func(tx database.Tx) error {
		genesisHash := chaincfg.MainNetParams.GenesisHash
		blockBytes, err := tx.FetchBlock(genesisHash)
		if err != nil {
			return err
		}

		// As documented, all data fetched from the database is only
		// valid during a database transaction in order to support
		// zero-copy backends.  Thus, make a copy of the data so it
		// can be used outside of the transaction.
		loadedBlockBytes = make([]byte, len(blockBytes))
		copy(loadedBlockBytes, blockBytes)
		return nil
	})
	if err != nil {
		fmt.Println(err)
		return
	}

	// Typically at this point, the block could be deserialized via the
	// wire.MsgBlock.Deserialize function or used in its serialized form
	// depending on need.  However, for this example, just display the
	// number of serialized bytes to show it was loaded as expected.
	fmt.Printf("Serialized block size: %d bytes\n", len(loadedBlockBytes))

	// Output:
	// Serialized block size: 285 bytes
}
コード例 #12
0
ファイル: cpuminer.go プロジェクト: Roasbeef/btcd
// GenerateNBlocks generates the requested number of blocks. It is self
// contained in that it creates block templates and attempts to solve them while
// detecting when it is performing stale work and reacting accordingly by
// generating a new block template.  When a block is solved, it is submitted.
// The function returns a list of the hashes of generated blocks.
func (m *CPUMiner) GenerateNBlocks(n uint32) ([]*chainhash.Hash, error) {
	m.Lock()

	// Respond with an error if server is already mining.
	if m.started || m.discreteMining {
		m.Unlock()
		return nil, errors.New("Server is already CPU mining. Please call " +
			"`setgenerate 0` before calling discrete `generate` commands.")
	}

	m.started = true
	m.discreteMining = true

	m.speedMonitorQuit = make(chan struct{})
	m.wg.Add(1)
	go m.speedMonitor()

	m.Unlock()

	log.Tracef("Generating %d blocks", n)

	i := uint32(0)
	blockHashes := make([]*chainhash.Hash, n, n)

	// Start a ticker which is used to signal checks for stale work and
	// updates to the speed monitor.
	ticker := time.NewTicker(time.Second * hashUpdateSecs)
	defer ticker.Stop()

	for {
		// Read updateNumWorkers in case someone tries a `setgenerate` while
		// we're generating. We can ignore it as the `generate` RPC call only
		// uses 1 worker.
		select {
		case <-m.updateNumWorkers:
		default:
		}

		// Grab the lock used for block submission, since the current block will
		// be changing and this would otherwise end up building a new block
		// template on a block that is in the process of becoming stale.
		m.submitBlockLock.Lock()
		curHeight := m.g.BestSnapshot().Height

		// Choose a payment address at random.
		rand.Seed(time.Now().UnixNano())
		payToAddr := m.cfg.MiningAddrs[rand.Intn(len(m.cfg.MiningAddrs))]

		// Create a new block template using the available transactions
		// in the memory pool as a source of transactions to potentially
		// include in the block.
		template, err := m.g.NewBlockTemplate(payToAddr)
		m.submitBlockLock.Unlock()
		if err != nil {
			errStr := fmt.Sprintf("Failed to create new block "+
				"template: %v", err)
			log.Errorf(errStr)
			continue
		}

		// Attempt to solve the block.  The function will exit early
		// with false when conditions that trigger a stale block, so
		// a new block template can be generated.  When the return is
		// true a solution was found, so submit the solved block.
		if m.solveBlock(template.Block, curHeight+1, ticker, nil) {
			block := btcutil.NewBlock(template.Block)
			m.submitBlock(block)
			blockHashes[i] = block.Hash()
			i++
			if i == n {
				log.Tracef("Generated %d blocks", i)
				m.Lock()
				close(m.speedMonitorQuit)
				m.wg.Wait()
				m.started = false
				m.discreteMining = false
				m.Unlock()
				return blockHashes, nil
			}
		}
	}
}
コード例 #13
0
ファイル: cpuminer.go プロジェクト: Roasbeef/btcd
// generateBlocks is a worker that is controlled by the miningWorkerController.
// It is self contained in that it creates block templates and attempts to solve
// them while detecting when it is performing stale work and reacting
// accordingly by generating a new block template.  When a block is solved, it
// is submitted.
//
// It must be run as a goroutine.
func (m *CPUMiner) generateBlocks(quit chan struct{}) {
	log.Tracef("Starting generate blocks worker")

	// Start a ticker which is used to signal checks for stale work and
	// updates to the speed monitor.
	ticker := time.NewTicker(time.Second * hashUpdateSecs)
	defer ticker.Stop()
out:
	for {
		// Quit when the miner is stopped.
		select {
		case <-quit:
			break out
		default:
			// Non-blocking select to fall through
		}

		// Wait until there is a connection to at least one other peer
		// since there is no way to relay a found block or receive
		// transactions to work on when there are no connected peers.
		if m.cfg.ConnectedCount() == 0 {
			time.Sleep(time.Second)
			continue
		}

		// No point in searching for a solution before the chain is
		// synced.  Also, grab the same lock as used for block
		// submission, since the current block will be changing and
		// this would otherwise end up building a new block template on
		// a block that is in the process of becoming stale.
		m.submitBlockLock.Lock()
		curHeight := m.g.BestSnapshot().Height
		if curHeight != 0 && !m.cfg.IsCurrent() {
			m.submitBlockLock.Unlock()
			time.Sleep(time.Second)
			continue
		}

		// Choose a payment address at random.
		rand.Seed(time.Now().UnixNano())
		payToAddr := m.cfg.MiningAddrs[rand.Intn(len(m.cfg.MiningAddrs))]

		// Create a new block template using the available transactions
		// in the memory pool as a source of transactions to potentially
		// include in the block.
		template, err := m.g.NewBlockTemplate(payToAddr)
		m.submitBlockLock.Unlock()
		if err != nil {
			errStr := fmt.Sprintf("Failed to create new block "+
				"template: %v", err)
			log.Errorf(errStr)
			continue
		}

		// Attempt to solve the block.  The function will exit early
		// with false when conditions that trigger a stale block, so
		// a new block template can be generated.  When the return is
		// true a solution was found, so submit the solved block.
		if m.solveBlock(template.Block, curHeight+1, ticker, quit) {
			block := btcutil.NewBlock(template.Block)
			m.submitBlock(block)
		}
	}

	m.workerWg.Done()
	log.Tracef("Generate blocks worker done")
}
コード例 #14
0
ファイル: chain_test.go プロジェクト: Roasbeef/btcd
// TestHaveBlock tests the HaveBlock API to ensure proper functionality.
func TestHaveBlock(t *testing.T) {
	// Load up blocks such that there is a side chain.
	// (genesis block) -> 1 -> 2 -> 3 -> 4
	//                          \-> 3a
	testFiles := []string{
		"blk_0_to_4.dat.bz2",
		"blk_3A.dat.bz2",
	}

	var blocks []*btcutil.Block
	for _, file := range testFiles {
		blockTmp, err := loadBlocks(file)
		if err != nil {
			t.Errorf("Error loading file: %v\n", err)
			return
		}
		blocks = append(blocks, blockTmp...)
	}

	// Create a new database and chain instance to run tests against.
	chain, teardownFunc, err := chainSetup("haveblock",
		&chaincfg.MainNetParams)
	if err != nil {
		t.Errorf("Failed to setup chain instance: %v", err)
		return
	}
	defer teardownFunc()

	// Since we're not dealing with the real block chain, disable
	// checkpoints and set the coinbase maturity to 1.
	chain.DisableCheckpoints(true)
	chain.TstSetCoinbaseMaturity(1)

	for i := 1; i < len(blocks); i++ {
		_, isOrphan, err := chain.ProcessBlock(blocks[i], blockchain.BFNone)
		if err != nil {
			t.Errorf("ProcessBlock fail on block %v: %v\n", i, err)
			return
		}
		if isOrphan {
			t.Errorf("ProcessBlock incorrectly returned block %v "+
				"is an orphan\n", i)
			return
		}
	}

	// Insert an orphan block.
	_, isOrphan, err := chain.ProcessBlock(btcutil.NewBlock(&Block100000),
		blockchain.BFNone)
	if err != nil {
		t.Errorf("Unable to process block: %v", err)
		return
	}
	if !isOrphan {
		t.Errorf("ProcessBlock indicated block is an not orphan when " +
			"it should be\n")
		return
	}

	tests := []struct {
		hash string
		want bool
	}{
		// Genesis block should be present (in the main chain).
		{hash: chaincfg.MainNetParams.GenesisHash.String(), want: true},

		// Block 3a should be present (on a side chain).
		{hash: "00000000474284d20067a4d33f6a02284e6ef70764a3a26d6a5b9df52ef663dd", want: true},

		// Block 100000 should be present (as an orphan).
		{hash: "000000000003ba27aa200b1cecaad478d2b00432346c3f1f3986da1afd33e506", want: true},

		// Random hashes should not be available.
		{hash: "123", want: false},
	}

	for i, test := range tests {
		hash, err := chainhash.NewHashFromStr(test.hash)
		if err != nil {
			t.Errorf("NewHashFromStr: %v", err)
			continue
		}

		result, err := chain.HaveBlock(hash)
		if err != nil {
			t.Errorf("HaveBlock #%d unexpected error: %v", i, err)
			return
		}
		if result != test.want {
			t.Errorf("HaveBlock #%d got %v want %v", i, result,
				test.want)
			continue
		}
	}
}
コード例 #15
0
ファイル: driver_test.go プロジェクト: Roasbeef/btcd
// TestPersistence ensures that values stored are still valid after closing and
// reopening the database.
func TestPersistence(t *testing.T) {
	t.Parallel()

	// Create a new database to run tests against.
	dbPath := filepath.Join(os.TempDir(), "ffldb-persistencetest")
	_ = os.RemoveAll(dbPath)
	db, err := database.Create(dbType, dbPath, blockDataNet)
	if err != nil {
		t.Errorf("Failed to create test database (%s) %v", dbType, err)
		return
	}
	defer os.RemoveAll(dbPath)
	defer db.Close()

	// Create a bucket, put some values into it, and store a block so they
	// can be tested for existence on re-open.
	bucket1Key := []byte("bucket1")
	storeValues := map[string]string{
		"b1key1": "foo1",
		"b1key2": "foo2",
		"b1key3": "foo3",
	}
	genesisBlock := btcutil.NewBlock(chaincfg.MainNetParams.GenesisBlock)
	genesisHash := chaincfg.MainNetParams.GenesisHash
	err = db.Update(func(tx database.Tx) error {
		metadataBucket := tx.Metadata()
		if metadataBucket == nil {
			return fmt.Errorf("Metadata: unexpected nil bucket")
		}

		bucket1, err := metadataBucket.CreateBucket(bucket1Key)
		if err != nil {
			return fmt.Errorf("CreateBucket: unexpected error: %v",
				err)
		}

		for k, v := range storeValues {
			err := bucket1.Put([]byte(k), []byte(v))
			if err != nil {
				return fmt.Errorf("Put: unexpected error: %v",
					err)
			}
		}

		if err := tx.StoreBlock(genesisBlock); err != nil {
			return fmt.Errorf("StoreBlock: unexpected error: %v",
				err)
		}

		return nil
	})
	if err != nil {
		t.Errorf("Update: unexpected error: %v", err)
		return
	}

	// Close and reopen the database to ensure the values persist.
	db.Close()
	db, err = database.Open(dbType, dbPath, blockDataNet)
	if err != nil {
		t.Errorf("Failed to open test database (%s) %v", dbType, err)
		return
	}
	defer db.Close()

	// Ensure the values previously stored in the 3rd namespace still exist
	// and are correct.
	err = db.View(func(tx database.Tx) error {
		metadataBucket := tx.Metadata()
		if metadataBucket == nil {
			return fmt.Errorf("Metadata: unexpected nil bucket")
		}

		bucket1 := metadataBucket.Bucket(bucket1Key)
		if bucket1 == nil {
			return fmt.Errorf("Bucket1: unexpected nil bucket")
		}

		for k, v := range storeValues {
			gotVal := bucket1.Get([]byte(k))
			if !reflect.DeepEqual(gotVal, []byte(v)) {
				return fmt.Errorf("Get: key '%s' does not "+
					"match expected value - got %s, want %s",
					k, gotVal, v)
			}
		}

		genesisBlockBytes, _ := genesisBlock.Bytes()
		gotBytes, err := tx.FetchBlock(genesisHash)
		if err != nil {
			return fmt.Errorf("FetchBlock: unexpected error: %v",
				err)
		}
		if !reflect.DeepEqual(gotBytes, genesisBlockBytes) {
			return fmt.Errorf("FetchBlock: stored block mismatch")
		}

		return nil
	})
	if err != nil {
		t.Errorf("View: unexpected error: %v", err)
		return
	}
}
コード例 #16
0
ファイル: whitebox_test.go プロジェクト: Roasbeef/btcd
// loadBlocks loads the blocks contained in the testdata directory and returns
// a slice of them.
func loadBlocks(t *testing.T, dataFile string, network wire.BitcoinNet) ([]*btcutil.Block, error) {
	// Open the file that contains the blocks for reading.
	fi, err := os.Open(dataFile)
	if err != nil {
		t.Errorf("failed to open file %v, err %v", dataFile, err)
		return nil, err
	}
	defer func() {
		if err := fi.Close(); err != nil {
			t.Errorf("failed to close file %v %v", dataFile,
				err)
		}
	}()
	dr := bzip2.NewReader(fi)

	// Set the first block as the genesis block.
	blocks := make([]*btcutil.Block, 0, 256)
	genesis := btcutil.NewBlock(chaincfg.MainNetParams.GenesisBlock)
	blocks = append(blocks, genesis)

	// Load the remaining blocks.
	for height := 1; ; height++ {
		var net uint32
		err := binary.Read(dr, binary.LittleEndian, &net)
		if err == io.EOF {
			// Hit end of file at the expected offset.  No error.
			break
		}
		if err != nil {
			t.Errorf("Failed to load network type for block %d: %v",
				height, err)
			return nil, err
		}
		if net != uint32(network) {
			t.Errorf("Block doesn't match network: %v expects %v",
				net, network)
			return nil, err
		}

		var blockLen uint32
		err = binary.Read(dr, binary.LittleEndian, &blockLen)
		if err != nil {
			t.Errorf("Failed to load block size for block %d: %v",
				height, err)
			return nil, err
		}

		// Read the block.
		blockBytes := make([]byte, blockLen)
		_, err = io.ReadFull(dr, blockBytes)
		if err != nil {
			t.Errorf("Failed to load block %d: %v", height, err)
			return nil, err
		}

		// Deserialize and store the block.
		block, err := btcutil.NewBlockFromBytes(blockBytes)
		if err != nil {
			t.Errorf("Failed to parse block %v: %v", height, err)
			return nil, err
		}
		blocks = append(blocks, block)
	}

	return blocks, nil
}
コード例 #17
0
ファイル: fullblocks_test.go プロジェクト: Roasbeef/btcd
// 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)
			}
		}
	}
}