Ejemplo n.º 1
0
// LogBlockHeight logs a new block height as an information message to show
// progress to the user. In order to prevent spam, it limits logging to one
// message every 10 seconds with duration and totals included.
func (b *blockProgressLogger) LogBlockHeight(block *dcrutil.Block) {
	b.Lock()
	defer b.Unlock()

	b.receivedLogBlocks++
	b.receivedLogTx += int64(len(block.MsgBlock().Transactions))

	now := time.Now()
	duration := now.Sub(b.lastBlockLogTime)
	if duration < time.Second*10 {
		return
	}

	// Truncate the duration to 10s of milliseconds.
	durationMillis := int64(duration / time.Millisecond)
	tDuration := 10 * time.Millisecond * time.Duration(durationMillis/10)

	// Log information about new block height.
	blockStr := "blocks"
	if b.receivedLogBlocks == 1 {
		blockStr = "block"
	}
	txStr := "transactions"
	if b.receivedLogTx == 1 {
		txStr = "transaction"
	}
	b.subsystemLogger.Infof("%s %d %s in the last %s (%d %s, height %d, %s)",
		b.progressAction, b.receivedLogBlocks, blockStr, tDuration, b.receivedLogTx,
		txStr, block.Height(), block.MsgBlock().Header.Timestamp)

	b.receivedLogBlocks = 0
	b.receivedLogTx = 0
	b.lastBlockLogTime = now
}
Ejemplo n.º 2
0
// dbIndexDisconnectBlock removes all of the index entries associated with the
// given block using the provided indexer and updates the tip of the indexer
// accordingly.  An error will be returned if the current tip for the indexer is
// not the passed block.
func dbIndexDisconnectBlock(dbTx database.Tx, indexer Indexer, block, parent *dcrutil.Block, view *blockchain.UtxoViewpoint) error {
	// Assert that the block being disconnected is the current tip of the
	// index.
	idxKey := indexer.Key()
	curTipHash, _, err := dbFetchIndexerTip(dbTx, idxKey)
	if err != nil {
		return err
	}
	if !curTipHash.IsEqual(block.Sha()) {
		return AssertError(fmt.Sprintf("dbIndexDisconnectBlock must "+
			"be called with the block at the current index tip "+
			"(%s, tip %s, block %s)", indexer.Name(),
			curTipHash, block.Sha()))
	}

	// Notify the indexer with the disconnected block so it can remove all
	// of the appropriate entries.
	if err := indexer.DisconnectBlock(dbTx, block, parent, view); err != nil {
		return err
	}

	// Update the current index tip.
	prevHash := &block.MsgBlock().Header.PrevBlock
	return dbPutIndexerTip(dbTx, idxKey, prevHash, uint32(block.Height())-1)
}
Ejemplo n.º 3
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// 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
}
Ejemplo n.º 4
0
// DebugBlockString dumps a verbose message containing information about
// the transactions of a block.
func DebugBlockString(block *dcrutil.Block) string {
	if block == nil {
		return "block pointer nil"
	}

	var buffer bytes.Buffer

	hash := block.Sha()

	str := fmt.Sprintf("Block Header: %v Height: %v \n",
		hash, block.Height())
	buffer.WriteString(str)

	str = fmt.Sprintf("Block contains %v regular transactions "+
		"and %v stake transactions \n",
		len(block.Transactions()),
		len(block.STransactions()))
	buffer.WriteString(str)

	str = fmt.Sprintf("List of regular transactions \n")
	buffer.WriteString(str)

	for i, tx := range block.Transactions() {
		str = fmt.Sprintf("Index: %v, Hash: %v \n", i, tx.Sha())
		buffer.WriteString(str)
	}

	if len(block.STransactions()) == 0 {
		return buffer.String()
	}

	str = fmt.Sprintf("List of stake transactions \n")
	buffer.WriteString(str)

	for i, stx := range block.STransactions() {
		txTypeStr := ""
		txType := stake.DetermineTxType(stx)
		switch txType {
		case stake.TxTypeSStx:
			txTypeStr = "SStx"
		case stake.TxTypeSSGen:
			txTypeStr = "SSGen"
		case stake.TxTypeSSRtx:
			txTypeStr = "SSRtx"
		default:
			txTypeStr = "Error"
		}

		str = fmt.Sprintf("Index: %v, Type: %v, Hash: %v \n",
			i, txTypeStr, stx.Sha())
		buffer.WriteString(str)
	}

	return buffer.String()
}
Ejemplo n.º 5
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// InsertBlock synchronously queues a newly solved block to have its
// transactions indexed by address.
func (a *addrIndexer) InsertBlock(block *dcrutil.Block, parent *dcrutil.Block) error {
	addrIndex, err := a.indexBlockAddrs(block, parent)
	if err != nil {
		return fmt.Errorf("Unable to index transactions of"+
			" block: %v", err)
	}
	err = a.server.db.UpdateAddrIndexForBlock(block.Sha(),
		block.Height(),
		addrIndex)
	if err != nil {
		return fmt.Errorf("Unable to insert block: %v", err.Error())
	}

	return nil
}
Ejemplo n.º 6
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// connectTxTree lets you connect an arbitrary TxTree to a txStore to push it
// forward in history.
// TxTree true == TxTreeRegular
// TxTree false == TxTreeStake
func connectTxTree(txStore TxStore,
	block *dcrutil.Block,
	txTree bool) {
	var transactions []*dcrutil.Tx
	if txTree {
		transactions = block.Transactions()
	} else {
		transactions = block.STransactions()
	}

	// Loop through all of the transactions in the block to see if any of
	// them are ones we need to update and spend based on the results map.
	for i, tx := range transactions {
		// Update the transaction store with the transaction information
		// if it's one of the requested transactions.
		msgTx := tx.MsgTx()
		if txD, exists := txStore[*tx.Sha()]; exists {
			txD.Tx = tx
			txD.BlockHeight = block.Height()
			txD.BlockIndex = uint32(i)
			txD.Spent = make([]bool, len(msgTx.TxOut))
			txD.Err = nil
		}

		// Spend the origin transaction output.
		for _, txIn := range msgTx.TxIn {
			originHash := &txIn.PreviousOutPoint.Hash
			originIndex := txIn.PreviousOutPoint.Index
			if originTx, exists := txStore[*originHash]; exists {
				if originTx.Spent == nil {
					continue
				}
				if originIndex >= uint32(len(originTx.Spent)) {
					continue
				}
				originTx.Spent[originIndex] = true
			}
		}
	}

	return
}
Ejemplo n.º 7
0
// dbIndexConnectBlock adds all of the index entries associated with the
// given block using the provided indexer and updates the tip of the indexer
// accordingly.  An error will be returned if the current tip for the indexer is
// not the previous block for the passed block.
func dbIndexConnectBlock(dbTx database.Tx, indexer Indexer, block, parent *dcrutil.Block, view *blockchain.UtxoViewpoint) error {
	// Assert that the block being connected properly connects to the
	// current tip of the index.
	idxKey := indexer.Key()
	curTipHash, _, err := dbFetchIndexerTip(dbTx, idxKey)
	if err != nil {
		return err
	}
	if !curTipHash.IsEqual(&block.MsgBlock().Header.PrevBlock) {
		return AssertError(fmt.Sprintf("dbIndexConnectBlock must be "+
			"called with a block that extends the current index "+
			"tip (%s, tip %s, block %s)", indexer.Name(),
			curTipHash, block.Sha()))
	}

	// Notify the indexer with the connected block so it can index it.
	if err := indexer.ConnectBlock(dbTx, block, parent, view); err != nil {
		return err
	}

	// Update the current index tip.
	return dbPutIndexerTip(dbTx, idxKey, block.Sha(), uint32(block.Height()))
}
Ejemplo n.º 8
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// connectTransactions updates the view by adding all new utxos created by all
// of the transactions in the passed block, marking all utxos the transactions
// spend as spent, and setting the best hash for the view to the passed block.
// In addition, when the 'stxos' argument is not nil, it will be updated to
// append an entry for each spent txout.
func (b *BlockChain) connectTransactions(view *UtxoViewpoint, block *dcrutil.Block,
	parent *dcrutil.Block, stxos *[]spentTxOut) error {
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	thisNodeStakeViewpoint := ViewpointPrevInvalidStake
	if regularTxTreeValid {
		thisNodeStakeViewpoint = ViewpointPrevValidStake
	}

	if parent != nil && block.Height() != 0 {
		view.SetStakeViewpoint(ViewpointPrevValidInitial)
		err := view.fetchInputUtxos(b.db, block, parent)
		if err != nil {
			return err
		}
		mBlock := block.MsgBlock()
		votebits := mBlock.Header.VoteBits
		regularTxTreeValid := dcrutil.IsFlagSet16(votebits, dcrutil.BlockValid)
		if regularTxTreeValid {
			for i, tx := range parent.Transactions() {
				err := view.connectTransaction(tx, parent.Height(), uint32(i),
					stxos)
				if err != nil {
					return err
				}
			}
		}
	}

	for i, stx := range block.STransactions() {
		view.SetStakeViewpoint(thisNodeStakeViewpoint)
		err := view.fetchInputUtxos(b.db, block, parent)
		if err != nil {
			return err
		}
		err = view.connectTransaction(stx, block.Height(), uint32(i), stxos)
		if err != nil {
			return err
		}
	}

	// Update the best hash for view to include this block since all of its
	// transactions have been connected.
	view.SetBestHash(block.Sha())
	return nil
}
Ejemplo n.º 9
0
// InsertBlock inserts raw block and transaction data from a block into the
// database.  The first block inserted into the database will be treated as the
// genesis block.  Every subsequent block insert requires the referenced parent
// block to already exist.
func (db *LevelDb) InsertBlock(block *dcrutil.Block) (height int64, rerr error) {
	// Be careful with this function on syncs.  It contains decred changes.

	// Obtain the previous block first so long as it's not the genesis block
	var blockPrev *dcrutil.Block

	// Decred: WARNING. This function assumes that all block insertion calls have
	// dcrutil.blocks passed to them with block.blockHeight set correctly. However,
	// loading the genesis block in btcd didn't do this (via block manager); pre-
	// production it should be established that all calls to this function pass
	// blocks with block.blockHeight set correctly.
	if block.Height() != 0 {
		var errBlockPrev error
		blockPrev, errBlockPrev = db.FetchBlockBySha(&block.MsgBlock().Header.PrevBlock)
		if errBlockPrev != nil {
			blockSha := block.Sha()
			log.Warnf("Failed to fetch parent block of block %v", blockSha)
			return 0, errBlockPrev
		}
	}

	db.dbLock.Lock()
	defer db.dbLock.Unlock()
	defer func() {
		if rerr == nil {
			rerr = db.processBatches()
		} else {
			db.lBatch().Reset()
		}
	}()

	blocksha := block.Sha()
	mblock := block.MsgBlock()
	rawMsg, err := block.Bytes()
	if err != nil {
		log.Warnf("Failed to obtain raw block sha %v", blocksha)
		return 0, err
	}
	_, sTxLoc, err := block.TxLoc()
	if err != nil {
		log.Warnf("Failed to obtain raw block sha %v, stxloc %v", blocksha, sTxLoc)
		return 0, err
	}

	// Insert block into database
	newheight, err := db.insertBlockData(blocksha, &mblock.Header.PrevBlock,
		rawMsg)
	if err != nil {
		log.Warnf("Failed to insert block %v %v %v", blocksha,
			&mblock.Header.PrevBlock, err)
		return 0, err
	}

	// Get data necessary to process regular tx tree of parent block if it's not
	// the genesis block.
	var mBlockPrev *wire.MsgBlock
	var txLoc []wire.TxLoc

	if blockPrev != nil {
		blockShaPrev := blockPrev.Sha()

		mBlockPrev = blockPrev.MsgBlock()

		txLoc, _, err = blockPrev.TxLoc()
		if err != nil {
			log.Warnf("Failed to obtain raw block sha %v, txloc %v", blockShaPrev, txLoc)
			return 0, err
		}
	}

	// Insert the regular tx of the parent block into the tx database if the vote
	// bits enable it, and if it's not the genesis block.
	votebits := mblock.Header.VoteBits
	if dcrutil.IsFlagSet16(votebits, dcrutil.BlockValid) && blockPrev != nil {
		for txidx, tx := range mBlockPrev.Transactions {
			txsha, err := blockPrev.TxSha(txidx)

			if err != nil {
				log.Warnf("failed to compute tx name block %v idx %v err %v", blocksha, txidx, err)
				return 0, err
			}
			spentbuflen := (len(tx.TxOut) + 7) / 8
			spentbuf := make([]byte, spentbuflen, spentbuflen)
			if len(tx.TxOut)%8 != 0 {
				for i := uint(len(tx.TxOut) % 8); i < 8; i++ {
					spentbuf[spentbuflen-1] |= (byte(1) << i)
				}
			}

			// newheight-1 instead of newheight below, as the tx is actually found
			// in the parent.
			//fmt.Printf("insert tx %v into db at height %v\n", txsha, newheight)
			err = db.insertTx(txsha, newheight-1, uint32(txidx), txLoc[txidx].TxStart, txLoc[txidx].TxLen, spentbuf)
			if err != nil {
				log.Warnf("block %v idx %v failed to insert tx %v %v err %v", blocksha, newheight-1, &txsha, txidx, err)
				return 0, err
			}

			err = db.doSpend(tx)
			if err != nil {
				log.Warnf("block %v idx %v failed to spend tx %v %v err %v", blocksha, newheight, txsha, txidx, err)
				return 0, err
			}
		}
	}

	// Insert the stake tx of the current block into the tx database.
	if len(mblock.STransactions) != 0 {
		for txidx, tx := range mblock.STransactions {
			txsha, err := block.STxSha(txidx)

			if err != nil {
				log.Warnf("failed to compute stake tx name block %v idx %v err %v", blocksha, txidx, err)
				return 0, err
			}
			spentbuflen := (len(tx.TxOut) + 7) / 8
			spentbuf := make([]byte, spentbuflen, spentbuflen)
			if len(tx.TxOut)%8 != 0 {
				for i := uint(len(tx.TxOut) % 8); i < 8; i++ {
					spentbuf[spentbuflen-1] |= (byte(1) << i)
				}
			}

			err = db.insertTx(txsha, newheight, uint32(txidx), sTxLoc[txidx].TxStart, sTxLoc[txidx].TxLen, spentbuf)
			if err != nil {
				log.Warnf("block %v idx %v failed to insert stake tx %v %v err %v", blocksha, newheight, &txsha, txidx, err)
				return 0, err
			}

			err = db.doSpend(tx)
			if err != nil {
				log.Warnf("block %v idx %v failed to spend stx %v %v err %v", blocksha, newheight, txsha, txidx, err)
				return 0, err
			}
		}
	}

	return newheight, nil
}
Ejemplo n.º 10
0
// dbAddTxIndexEntries uses an existing database transaction to add a
// transaction index entry for every transaction in the passed block.
func dbAddTxIndexEntries(dbTx database.Tx, block, parent *dcrutil.Block, blockID uint32) error {
	// The offset and length of the transactions within the serialized
	// block, for the regular transactions of the parent (if added)
	// and the stake transactions of the current block.
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	var parentRegularTxs []*dcrutil.Tx
	var parentTxLocs []wire.TxLoc
	var parentBlockID uint32
	if regularTxTreeValid && block.Height() > 1 {
		var err error
		parentRegularTxs = parent.Transactions()

		parentTxLocs, _, err = parent.TxLoc()
		if err != nil {
			return err
		}

		parentSha := parent.Sha()
		parentBlockID, err = dbFetchBlockIDByHash(dbTx, *parentSha)
		if err != nil {
			return err
		}
	}
	_, blockStxLocs, err := block.TxLoc()
	if err != nil {
		return err
	}

	allTxs := append(parentRegularTxs, block.STransactions()...)
	allTxsLocs := append(parentTxLocs, blockStxLocs...)
	stakeTxStartIdx := len(parentRegularTxs)

	// As an optimization, allocate a single slice big enough to hold all
	// of the serialized transaction index entries for the block and
	// serialize them directly into the slice.  Then, pass the appropriate
	// subslice to the database to be written.  This approach significantly
	// cuts down on the number of required allocations.
	offset := 0
	serializedValues := make([]byte, len(allTxs)*txEntrySize)
	blockIDToUse := parentBlockID
	for i, tx := range allTxs {
		// Switch to using the newest block ID for the stake transactions,
		// since these are not from the parent.
		if i == stakeTxStartIdx {
			blockIDToUse = blockID
		}

		putTxIndexEntry(serializedValues[offset:], blockIDToUse, allTxsLocs[i])
		endOffset := offset + txEntrySize
		txSha := tx.Sha()
		err := dbPutTxIndexEntry(dbTx, *txSha,
			serializedValues[offset:endOffset:endOffset])
		if err != nil {
			return err
		}
		offset += txEntrySize
	}

	return nil
}
Ejemplo n.º 11
0
// ProcessBlock is the main workhorse for handling insertion of new blocks into
// the block chain.  It includes functionality such as rejecting duplicate
// blocks, ensuring blocks follow all rules, orphan handling, and insertion into
// the block chain along with best chain selection and reorganization.
//
// It returns a first bool specifying whether or not the block is on on a fork
// or on a side chain. True means it's on the main chain.
//
// This function is safe for concurrent access.
func (b *BlockChain) ProcessBlock(block *dcrutil.Block, flags BehaviorFlags) (bool, bool, error) {
	b.chainLock.Lock()
	defer b.chainLock.Unlock()

	fastAdd := flags&BFFastAdd == BFFastAdd
	dryRun := flags&BFDryRun == BFDryRun

	blockHash := block.Sha()
	log.Tracef("Processing block %v", blockHash)
	currentTime := time.Now()
	defer func() {
		elapsedTime := time.Since(currentTime)
		log.Debugf("Block %v (height %v) finished processing in %s",
			blockHash, block.Height(), elapsedTime)
	}()

	// The block must not already exist in the main chain or side chains.
	exists, err := b.blockExists(blockHash)
	if err != nil {
		return false, false, err
	}
	if exists {
		str := fmt.Sprintf("already have block %v", blockHash)
		return false, false, ruleError(ErrDuplicateBlock, str)
	}

	// The block must not already exist as an orphan.
	if _, exists := b.orphans[*blockHash]; exists {
		str := fmt.Sprintf("already have block (orphan) %v", blockHash)
		return false, false, ruleError(ErrDuplicateBlock, str)
	}

	// Perform preliminary sanity checks on the block and its transactions.
	err = checkBlockSanity(block, b.timeSource, flags, b.chainParams)
	if err != nil {
		return false, false, err
	}

	// Find the previous checkpoint and perform some additional checks based
	// on the checkpoint.  This provides a few nice properties such as
	// preventing old side chain blocks before the last checkpoint,
	// rejecting easy to mine, but otherwise bogus, blocks that could be
	// used to eat memory, and ensuring expected (versus claimed) proof of
	// work requirements since the previous checkpoint are met.
	blockHeader := &block.MsgBlock().Header
	checkpointBlock, err := b.findPreviousCheckpoint()
	if err != nil {
		return false, false, err
	}
	if checkpointBlock != nil {
		// Ensure the block timestamp is after the checkpoint timestamp.
		checkpointHeader := &checkpointBlock.MsgBlock().Header
		checkpointTime := checkpointHeader.Timestamp
		if blockHeader.Timestamp.Before(checkpointTime) {
			str := fmt.Sprintf("block %v has timestamp %v before "+
				"last checkpoint timestamp %v", blockHash,
				blockHeader.Timestamp, checkpointTime)
			return false, false, ruleError(ErrCheckpointTimeTooOld, str)
		}

		if !fastAdd {
			// Even though the checks prior to now have already ensured the
			// proof of work exceeds the claimed amount, the claimed amount
			// is a field in the block header which could be forged.  This
			// check ensures the proof of work is at least the minimum
			// expected based on elapsed time since the last checkpoint and
			// maximum adjustment allowed by the retarget rules.
			duration := blockHeader.Timestamp.Sub(checkpointTime)
			requiredTarget := CompactToBig(b.calcEasiestDifficulty(
				checkpointHeader.Bits, duration))
			currentTarget := CompactToBig(blockHeader.Bits)
			if currentTarget.Cmp(requiredTarget) > 0 {
				str := fmt.Sprintf("block target difficulty of %064x "+
					"is too low when compared to the previous "+
					"checkpoint", currentTarget)
				return false, false, ruleError(ErrDifficultyTooLow, str)
			}
		}
	}

	// Handle orphan blocks.
	prevHash := &blockHeader.PrevBlock
	prevHashExists, err := b.blockExists(prevHash)
	if err != nil {
		return false, false, err
	}
	if !prevHashExists {
		if !dryRun {
			log.Infof("Adding orphan block %v with parent %v",
				blockHash, prevHash)
			b.addOrphanBlock(block)
		}

		return false, true, err
	}

	// The block has passed all context independent checks and appears sane
	// enough to potentially accept it into the block chain.
	var onMainChain bool
	onMainChain, err = b.maybeAcceptBlock(block, flags)
	if err != nil {
		return false, false, err
	}

	// Don't process any orphans or log when the dry run flag is set.
	if !dryRun {
		// Accept any orphan blocks that depend on this block (they are
		// no longer orphans) and repeat for those accepted blocks until
		// there are no more.
		err := b.processOrphans(blockHash, flags)
		if err != nil {
			return false, false, err
		}

		log.Debugf("Accepted block %v", blockHash)
	}

	return onMainChain, false, err
}
Ejemplo n.º 12
0
// findWhereDoubleSpent determines where a tx was previously doublespent.
// VERY INTENSIVE BLOCKCHAIN SCANNING, USE TO DEBUG SIMULATED BLOCKCHAINS
// ONLY.
func (b *BlockChain) findWhereDoubleSpent(block *dcrutil.Block) error {
	height := int64(1)
	heightEnd := block.Height()

	hashes, err := b.db.FetchHeightRange(height, heightEnd)
	if err != nil {
		return err
	}

	var allTxs []*dcrutil.Tx
	txs := block.Transactions()[1:]
	stxs := block.STransactions()
	allTxs = append(txs, stxs...)

	for _, hash := range hashes {
		curBlock, err := b.getBlockFromHash(&hash)
		if err != nil {
			return err
		}
		log.Errorf("Cur block %v", curBlock.Height())

		for _, localTx := range allTxs {
			for _, localTxIn := range localTx.MsgTx().TxIn {
				for _, tx := range curBlock.Transactions()[1:] {
					for _, txIn := range tx.MsgTx().TxIn {
						if txIn.PreviousOutPoint == localTxIn.PreviousOutPoint {
							log.Errorf("Double spend of {hash: %v, idx: %v,"+
								" tree: %b}, previously found in tx %v "+
								"of block %v txtree regular",
								txIn.PreviousOutPoint.Hash,
								txIn.PreviousOutPoint.Index,
								txIn.PreviousOutPoint.Tree,
								tx.Sha(),
								hash)
						}
					}
				}

				for _, tx := range curBlock.STransactions() {
					for _, txIn := range tx.MsgTx().TxIn {
						if txIn.PreviousOutPoint == localTxIn.PreviousOutPoint {
							log.Errorf("Double spend of {hash: %v, idx: %v,"+
								" tree: %b}, previously found in tx %v "+
								"of block %v txtree stake\n",
								txIn.PreviousOutPoint.Hash,
								txIn.PreviousOutPoint.Index,
								txIn.PreviousOutPoint.Tree,
								tx.Sha(),
								hash)
						}
					}
				}
			}
		}
	}

	for _, localTx := range stxs {
		for _, localTxIn := range localTx.MsgTx().TxIn {
			for _, tx := range txs {
				for _, txIn := range tx.MsgTx().TxIn {
					if txIn.PreviousOutPoint == localTxIn.PreviousOutPoint {
						log.Errorf("Double spend of {hash: %v, idx: %v,"+
							" tree: %b}, previously found in tx %v "+
							"of cur block stake txtree\n",
							txIn.PreviousOutPoint.Hash,
							txIn.PreviousOutPoint.Index,
							txIn.PreviousOutPoint.Tree,
							tx.Sha())
					}
				}
			}
		}
	}

	return nil
}
Ejemplo n.º 13
0
// ConnectBlock is invoked by the index manager when a new block has been
// connected to the main chain.  This indexer adds a mapping for each address
// the transactions in the block involve.
//
// This is part of the Indexer interface.
func (idx *AddrIndex) ConnectBlock(dbTx database.Tx, block, parent *dcrutil.Block,
	view *blockchain.UtxoViewpoint) error {
	// The offset and length of the transactions within the serialized
	// block for the regular transactions of the previous block, if
	// applicable.
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	var parentTxLocs []wire.TxLoc
	var parentBlockID uint32
	if regularTxTreeValid && block.Height() > 1 {
		var err error
		parentTxLocs, _, err = parent.TxLoc()
		if err != nil {
			return err
		}

		parentSha := parent.Sha()
		parentBlockID, err = dbFetchBlockIDByHash(dbTx, *parentSha)
		if err != nil {
			return err
		}
	}

	// The offset and length of the transactions within the serialized
	// block for the added stake transactions.
	_, blockStxLocs, err := block.TxLoc()
	if err != nil {
		return err
	}

	// Nothing to index, just return.
	if len(parentTxLocs)+len(blockStxLocs) == 0 {
		return nil
	}

	// Get the internal block ID associated with the block.
	blockSha := block.Sha()
	blockID, err := dbFetchBlockIDByHash(dbTx, *blockSha)
	if err != nil {
		return err
	}

	// Build all of the address to transaction mappings in a local map.
	addrsToTxns := make(writeIndexData)
	idx.indexBlock(addrsToTxns, block, parent, view)

	// Add all of the index entries for each address.
	stakeIdxsStart := len(parentTxLocs)
	allTxLocs := append(parentTxLocs, blockStxLocs...)
	addrIdxBucket := dbTx.Metadata().Bucket(addrIndexKey)
	for addrKey, txIdxs := range addrsToTxns {
		for _, txIdx := range txIdxs {
			// Switch to using the newest block ID for the stake transactions,
			// since these are not from the parent. Offset the index to be
			// correct for the location in this given block.
			blockIDToUse := parentBlockID
			if txIdx >= stakeIdxsStart {
				blockIDToUse = blockID
			}

			err := dbPutAddrIndexEntry(addrIdxBucket, addrKey,
				blockIDToUse, allTxLocs[txIdx])
			if err != nil {
				return err
			}
		}
	}

	return nil
}
Ejemplo n.º 14
0
// indexBlockAddrs returns a populated index of the all the transactions in the
// passed block based on the addresses involved in each transaction.
func (a *addrIndexer) indexBlockAddrs(blk *dcrutil.Block,
	parent *dcrutil.Block) (database.BlockAddrIndex, error) {
	var addrIndex database.BlockAddrIndex
	_, stxLocs, err := blk.TxLoc()
	if err != nil {
		return nil, err
	}

	txTreeRegularValid := dcrutil.IsFlagSet16(blk.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)

	// Add regular transactions iff the block was validated.
	if txTreeRegularValid {
		txLocs, _, err := parent.TxLoc()
		if err != nil {
			return nil, err
		}
		for txIdx, tx := range parent.Transactions() {
			// Tx's offset and length in the block.
			locInBlock := &txLocs[txIdx]

			// Coinbases don't have any inputs.
			if !blockchain.IsCoinBase(tx) {
				// Index the SPK's of each input's previous outpoint
				// transaction.
				for _, txIn := range tx.MsgTx().TxIn {
					prevOutTx, err := a.lookupTransaction(
						txIn.PreviousOutPoint.Hash,
						blk,
						parent)
					inputOutPoint := prevOutTx.TxOut[txIn.PreviousOutPoint.Index]

					toAppend, err := convertToAddrIndex(inputOutPoint.Version,
						inputOutPoint.PkScript, parent.Height(), locInBlock)
					if err != nil {
						adxrLog.Tracef("Error converting tx txin %v: %v",
							txIn.PreviousOutPoint.Hash, err)
						continue
					}
					addrIndex = append(addrIndex, toAppend...)
				}
			}

			for _, txOut := range tx.MsgTx().TxOut {
				toAppend, err := convertToAddrIndex(txOut.Version, txOut.PkScript,
					parent.Height(), locInBlock)
				if err != nil {
					adxrLog.Tracef("Error converting tx txout %v: %v",
						tx.MsgTx().TxSha(), err)
					continue
				}
				addrIndex = append(addrIndex, toAppend...)
			}
		}
	}

	// Add stake transactions.
	for stxIdx, stx := range blk.STransactions() {
		// Tx's offset and length in the block.
		locInBlock := &stxLocs[stxIdx]

		isSSGen, _ := stake.IsSSGen(stx)

		// Index the SPK's of each input's previous outpoint
		// transaction.
		for i, txIn := range stx.MsgTx().TxIn {
			// Stakebases don't have any inputs.
			if isSSGen && i == 0 {
				continue
			}

			// Lookup and fetch the referenced output's tx.
			prevOutTx, err := a.lookupTransaction(
				txIn.PreviousOutPoint.Hash,
				blk,
				parent)
			inputOutPoint := prevOutTx.TxOut[txIn.PreviousOutPoint.Index]

			toAppend, err := convertToAddrIndex(inputOutPoint.Version,
				inputOutPoint.PkScript, blk.Height(), locInBlock)
			if err != nil {
				adxrLog.Tracef("Error converting stx txin %v: %v",
					txIn.PreviousOutPoint.Hash, err)
				continue
			}
			addrIndex = append(addrIndex, toAppend...)
		}

		for _, txOut := range stx.MsgTx().TxOut {
			toAppend, err := convertToAddrIndex(txOut.Version, txOut.PkScript,
				blk.Height(), locInBlock)
			if err != nil {
				adxrLog.Tracef("Error converting stx txout %v: %v",
					stx.MsgTx().TxSha(), err)
				continue
			}
			addrIndex = append(addrIndex, toAppend...)
		}
	}

	return addrIndex, nil
}
Ejemplo n.º 15
0
// insertBlock is the internal function which implements the public
// InsertBlock.  See the comment for InsertBlock for more details.
//
// This function MUST be called with the tmdb lock held (for writes).
func (tmdb *TicketDB) insertBlock(block *dcrutil.Block) (SStxMemMap,
	SStxMemMap, SStxMemMap, error) {

	height := block.Height()
	if height < tmdb.StakeEnabledHeight {
		return nil, nil, nil, nil
	}

	// Sanity check: Does the number of tickets in ticketMap equal the number
	// of tickets indicated in the header?
	poolSizeBlock := int(block.MsgBlock().Header.PoolSize)
	poolSize := 0
	for i := 0; i < BucketsSize; i++ {
		poolSize += len(tmdb.maps.ticketMap[i])
	}
	if poolSize != poolSizeBlock {
		return nil, nil, nil, fmt.Errorf("ticketpoolsize in block %v not "+
			"equal to the calculated ticketpoolsize, indicating database "+
			"corruption (got %v, want %v)",
			block.Sha(),
			poolSizeBlock,
			poolSize)
	}

	// Create the block in the spentTicketMap.
	tmdb.maybeInsertBlock(block.Height())

	// Iterate through all the SSGen (vote) tx in the block and add them to
	// a map of tickets that were actually used. The rest of the tickets in
	// the buckets were then considered missed --> missedTicketMap.
	// Note that it doesn't really matter what value you set usedTickets to,
	// it's just a map of tickets that were actually used in the block. It
	// would probably be more efficient to use an array.
	usedTickets := make(map[chainhash.Hash]struct{})
	spendingHashes := make(map[chainhash.Hash]chainhash.Hash)
	revocations := make(map[chainhash.Hash]struct{})

	for _, staketx := range block.STransactions() {
		if is, _ := IsSSGen(staketx); is {
			msgTx := staketx.MsgTx()
			sstxIn := msgTx.TxIn[1] // sstx input
			sstxHash := sstxIn.PreviousOutPoint.Hash

			usedTickets[sstxHash] = struct{}{}
			spendingHashes[sstxHash] = *staketx.Sha()
		}

		if is, _ := IsSSRtx(staketx); is {
			msgTx := staketx.MsgTx()
			sstxIn := msgTx.TxIn[0] // sstx input
			sstxHash := sstxIn.PreviousOutPoint.Hash

			revocations[sstxHash] = struct{}{}
		}
	}

	// Spend or miss all the necessary tickets and do some sanity checks.
	parentBlock, err := tmdb.database.FetchBlockBySha(
		&block.MsgBlock().Header.PrevBlock)
	if err != nil {
		return nil, nil, nil, err
	}
	spentAndMissedTickets, err := tmdb.spendTickets(parentBlock,
		usedTickets,
		spendingHashes)
	if err != nil {
		return nil, nil, nil, err
	}

	// Expire all old tickets, and stick them into the spent and missed ticket
	// map too.
	expiredTickets, err := tmdb.expireTickets(height)
	if err != nil {
		return nil, nil, nil, err
	}
	if len(expiredTickets) > 0 && len(spentAndMissedTickets) == 0 {
		return nil, nil, nil, fmt.Errorf("tried to expire tickets before " +
			"stake validation height! TicketExpiry may be too small")
	}
	if len(expiredTickets) > 0 {
		for hash, ticket := range expiredTickets {
			spentAndMissedTickets[hash] = ticket
		}
	}

	revokedTickets, err := tmdb.revokeTickets(revocations)
	if err != nil {
		return nil, nil, nil, err
	}

	newTickets, err := tmdb.pushMatureTicketsAtHeight(block.Height())
	if err != nil {
		return nil, nil, nil, err
	}

	log.Debugf("Connected block %v (height %v) to the ticket database",
		block.Sha(), block.Height())

	return cloneSStxMemMap(spentAndMissedTickets), cloneSStxMemMap(newTickets),
		cloneSStxMemMap(revokedTickets), nil
}
Ejemplo n.º 16
0
// IsCheckpointCandidate returns whether or not the passed block is a good
// checkpoint candidate.
//
// The factors used to determine a good checkpoint are:
//  - The block must be in the main chain
//  - The block must be at least 'CheckpointConfirmations' blocks prior to the
//    current end of the main chain
//  - The timestamps for the blocks before and after the checkpoint must have
//    timestamps which are also before and after the checkpoint, respectively
//    (due to the median time allowance this is not always the case)
//  - The block must not contain any strange transaction such as those with
//    nonstandard scripts
//
// The intent is that candidates are reviewed by a developer to make the final
// decision and then manually added to the list of checkpoints for a network.
//
// This function is safe for concurrent access.
func (b *BlockChain) IsCheckpointCandidate(block *dcrutil.Block) (bool, error) {
	b.chainLock.RLock()
	defer b.chainLock.RUnlock()

	// Checkpoints must be enabled.
	if b.noCheckpoints {
		return false, fmt.Errorf("checkpoints are disabled")
	}

	var isCandidate bool
	err := b.db.View(func(dbTx database.Tx) error {
		// A checkpoint must be in the main chain.
		blockHeight, err := dbFetchHeightByHash(dbTx, block.Sha())
		if err != nil {
			// Only return an error if it's not due to the block not
			// being in the main chain.
			if !isNotInMainChainErr(err) {
				return err
			}
			return nil
		}

		// Ensure the height of the passed block and the entry for the
		// block in the main chain match.  This should always be the
		// case unless the caller provided an invalid block.
		if blockHeight != block.Height() {
			return fmt.Errorf("passed block height of %d does not "+
				"match the main chain height of %d",
				block.Height(), blockHeight)
		}

		// A checkpoint must be at least CheckpointConfirmations blocks
		// before the end of the main chain.
		mainChainHeight := b.bestNode.height
		if blockHeight > (mainChainHeight - CheckpointConfirmations) {
			return nil
		}

		// Get the previous block header.
		prevHash := &block.MsgBlock().Header.PrevBlock
		prevHeader, err := dbFetchHeaderByHash(dbTx, prevHash)
		if err != nil {
			return err
		}

		// Get the next block header.
		nextHeader, err := dbFetchHeaderByHeight(dbTx, blockHeight+1)
		if err != nil {
			return err
		}

		// A checkpoint must have timestamps for the block and the
		// blocks on either side of it in order (due to the median time
		// allowance this is not always the case).
		prevTime := prevHeader.Timestamp
		curTime := block.MsgBlock().Header.Timestamp
		nextTime := nextHeader.Timestamp
		if prevTime.After(curTime) || nextTime.Before(curTime) {
			return nil
		}

		// A checkpoint must have transactions that only contain
		// standard scripts.
		for _, tx := range block.Transactions() {
			if isNonstandardTransaction(tx) {
				return nil
			}
		}

		// All of the checks passed, so the block is a candidate.
		isCandidate = true
		return nil
	})
	return isCandidate, err
}
Ejemplo n.º 17
0
// ConnectBlock is invoked by the index manager when a new block has been
// connected to the main chain.  This indexer adds a key for each address
// the transactions in the block involve.
//
// This is part of the Indexer interface.
func (idx *ExistsAddrIndex) ConnectBlock(dbTx database.Tx, block, parent *dcrutil.Block, view *blockchain.UtxoViewpoint) error {
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	var parentTxs []*dcrutil.Tx
	if regularTxTreeValid && block.Height() > 1 {
		parentTxs = parent.Transactions()
	}
	blockTxns := block.STransactions()
	allTxns := append(parentTxs, blockTxns...)

	usedAddrs := make(map[[addrKeySize]byte]struct{})

	for _, tx := range allTxns {
		msgTx := tx.MsgTx()
		isSStx, _ := stake.IsSStx(msgTx)
		for _, txIn := range msgTx.TxIn {
			if txscript.IsMultisigSigScript(txIn.SignatureScript) {
				rs, err :=
					txscript.MultisigRedeemScriptFromScriptSig(
						txIn.SignatureScript)
				if err != nil {
					continue
				}

				class, addrs, _, err := txscript.ExtractPkScriptAddrs(
					txscript.DefaultScriptVersion, rs, idx.chainParams)
				if err != nil {
					// Non-standard outputs are skipped.
					continue
				}
				if class != txscript.MultiSigTy {
					// This should never happen, but be paranoid.
					continue
				}

				for _, addr := range addrs {
					k, err := addrToKey(addr, idx.chainParams)
					if err != nil {
						continue
					}

					usedAddrs[k] = struct{}{}
				}
			}
		}

		for _, txOut := range tx.MsgTx().TxOut {
			class, addrs, _, err := txscript.ExtractPkScriptAddrs(
				txOut.Version, txOut.PkScript, idx.chainParams)
			if err != nil {
				// Non-standard outputs are skipped.
				continue
			}

			if isSStx && class == txscript.NullDataTy {
				addr, err := stake.AddrFromSStxPkScrCommitment(txOut.PkScript,
					idx.chainParams)
				if err != nil {
					// Ignore unsupported address types.
					continue
				}

				addrs = append(addrs, addr)
			}

			for _, addr := range addrs {
				k, err := addrToKey(addr, idx.chainParams)
				if err != nil {
					// Ignore unsupported address types.
					continue
				}

				usedAddrs[k] = struct{}{}
			}
		}
	}

	// Write all the newly used addresses to the database,
	// skipping any keys that already exist. Write any
	// addresses we see in mempool at this time, too,
	// then remove them from the unconfirmed map drop
	// dropping the old map and reassigning a new map.
	idx.unconfirmedLock.Lock()
	for k := range idx.mpExistsAddr {
		usedAddrs[k] = struct{}{}
	}
	idx.mpExistsAddr = make(map[[addrKeySize]byte]struct{})
	idx.unconfirmedLock.Unlock()

	meta := dbTx.Metadata()
	existsAddrIndex := meta.Bucket(existsAddrIndexKey)
	newUsedAddrs := make(map[[addrKeySize]byte]struct{})
	for k := range usedAddrs {
		if !idx.existsAddress(existsAddrIndex, k) {
			newUsedAddrs[k] = struct{}{}
		}
	}

	for k := range newUsedAddrs {
		err := dbPutExistsAddr(existsAddrIndex, k)
		if err != nil {
			return err
		}
	}

	return nil
}
Ejemplo n.º 18
0
// IsCheckpointCandidate returns whether or not the passed block is a good
// checkpoint candidate.
//
// The factors used to determine a good checkpoint are:
//  - The block must be in the main chain
//  - The block must be at least 'CheckpointConfirmations' blocks prior to the
//    current end of the main chain
//  - The timestamps for the blocks before and after the checkpoint must have
//    timestamps which are also before and after the checkpoint, respectively
//    (due to the median time allowance this is not always the case)
//  - The block must not contain any strange transaction such as those with
//    nonstandard scripts
//
// The intent is that candidates are reviewed by a developer to make the final
// decision and then manually added to the list of checkpoints for a network.
func (b *BlockChain) IsCheckpointCandidate(block *dcrutil.Block) (bool, error) {
	// Checkpoints must be enabled.
	if b.noCheckpoints {
		return false, fmt.Errorf("checkpoints are disabled")
	}

	// A checkpoint must be in the main chain.
	exists, err := b.db.ExistsSha(block.Sha())
	if err != nil {
		return false, err
	}
	if !exists {
		return false, nil
	}

	// A checkpoint must be at least CheckpointConfirmations blocks before
	// the end of the main chain.
	blockHeight := block.Height()
	_, mainChainHeight, err := b.db.NewestSha()
	if err != nil {
		return false, err
	}
	if blockHeight > (mainChainHeight - CheckpointConfirmations) {
		return false, nil
	}

	// Get the previous block.
	prevHash := &block.MsgBlock().Header.PrevBlock
	prevBlock, err := b.db.FetchBlockBySha(prevHash)
	if err != nil {
		return false, err
	}

	// Get the next block.
	nextHash, err := b.db.FetchBlockShaByHeight(blockHeight + 1)
	if err != nil {
		return false, err
	}
	nextBlock, err := b.db.FetchBlockBySha(nextHash)
	if err != nil {
		return false, err
	}

	// A checkpoint must have timestamps for the block and the blocks on
	// either side of it in order (due to the median time allowance this is
	// not always the case).
	prevTime := prevBlock.MsgBlock().Header.Timestamp
	curTime := block.MsgBlock().Header.Timestamp
	nextTime := nextBlock.MsgBlock().Header.Timestamp
	if prevTime.After(curTime) || nextTime.Before(curTime) {
		return false, nil
	}

	// A checkpoint must have transactions that only contain standard
	// scripts.
	for _, tx := range block.Transactions() {
		if isNonstandardTransaction(tx) {
			return false, nil
		}
	}

	return true, nil
}
Ejemplo n.º 19
0
// fetchInputUtxos loads utxo details about the input transactions referenced
// by the transactions in the given block into the view from the database as
// needed.  In particular, referenced entries that are earlier in the block are
// added to the view and entries that are already in the view are not modified.
func (view *UtxoViewpoint) fetchInputUtxos(db database.DB,
	block, parent *dcrutil.Block) error {
	viewpoint := view.StakeViewpoint()

	// Build a map of in-flight transactions because some of the inputs in
	// this block could be referencing other transactions earlier in this
	// block which are not yet in the chain.
	txInFlight := map[chainhash.Hash]int{}
	txNeededSet := make(map[chainhash.Hash]struct{})

	// Case 1: ViewpointPrevValidInitial. We need the viewpoint of the
	// current chain without the TxTreeRegular of the previous block
	// added so we can validate that.
	if viewpoint == ViewpointPrevValidInitial {
		transactions := parent.Transactions()
		for i, tx := range transactions {
			txInFlight[*tx.Sha()] = i
		}

		// Loop through all of the transaction inputs (except for the coinbase
		// which has no inputs) collecting them into sets of what is needed and
		// what is already known (in-flight).
		for i, tx := range transactions[1:] {
			for _, txIn := range tx.MsgTx().TxIn {
				// It is acceptable for a transaction input to reference
				// the output of another transaction in this block only
				// if the referenced transaction comes before the
				// current one in this block.  Add the outputs of the
				// referenced transaction as available utxos when this
				// is the case.  Otherwise, the utxo details are still
				// needed.
				//
				// NOTE: The >= is correct here because i is one less
				// than the actual position of the transaction within
				// the block due to skipping the coinbase.
				originHash := &txIn.PreviousOutPoint.Hash
				if inFlightIndex, ok := txInFlight[*originHash]; ok &&
					i >= inFlightIndex {

					originTx := transactions[inFlightIndex]
					view.AddTxOuts(originTx, block.Height(), uint32(i))
					continue
				}

				// Don't request entries that are already in the view
				// from the database.
				if _, ok := view.entries[*originHash]; ok {
					continue
				}

				txNeededSet[*originHash] = struct{}{}
			}
		}

		// Request the input utxos from the database.
		return view.fetchUtxosMain(db, txNeededSet)
	}

	// Case 2+3: ViewpointPrevValidStake and ViewpointPrevValidStake.
	// For ViewpointPrevValidStake, we need the viewpoint of the
	// current chain with the TxTreeRegular of the previous block
	// added so we can validate the TxTreeStake of the current block.
	// For ViewpointPrevInvalidStake, we need the viewpoint of the
	// current chain with the TxTreeRegular of the previous block
	// missing so we can validate the TxTreeStake of the current block.
	if viewpoint == ViewpointPrevValidStake ||
		viewpoint == ViewpointPrevInvalidStake {
		// We need all of the stake tx txins. None of these are considered
		// in-flight in relation to the regular tx tree or to other tx in
		// the stake tx tree, so don't do any of those expensive checks and
		// just append it to the tx slice.
		for _, tx := range block.MsgBlock().STransactions {
			isSSGen, _ := stake.IsSSGen(tx)

			for i, txIn := range tx.TxIn {
				// Ignore stakebases.
				if isSSGen && i == 0 {
					continue
				}

				// Add an entry to the transaction store for the needed
				// transaction with it set to missing by default.
				originHash := &txIn.PreviousOutPoint.Hash

				// Don't request entries that are already in the view
				// from the database.
				if _, ok := view.entries[*originHash]; ok {
					continue
				}

				txNeededSet[*originHash] = struct{}{}
			}
		}

		// Request the input utxos from the database.
		return view.fetchUtxosMain(db, txNeededSet)
	}

	// Case 4+5: ViewpointPrevValidRegular and
	// ViewpointPrevInvalidRegular.
	// For ViewpointPrevValidRegular, we need the viewpoint of the
	// current chain with the TxTreeRegular of the previous block
	// and the TxTreeStake of the current block added so we can
	// validate the TxTreeRegular of the current block.
	// For ViewpointPrevInvalidRegular, we need the viewpoint of the
	// current chain with the TxTreeRegular of the previous block
	// missing and the TxTreeStake of the current block added so we
	// can validate the TxTreeRegular of the current block.
	if viewpoint == ViewpointPrevValidRegular ||
		viewpoint == ViewpointPrevInvalidRegular {
		transactions := block.Transactions()
		for i, tx := range transactions {
			txInFlight[*tx.Sha()] = i
		}

		// Loop through all of the transaction inputs (except for the coinbase
		// which has no inputs) collecting them into sets of what is needed and
		// what is already known (in-flight).
		txNeededSet := make(map[chainhash.Hash]struct{})
		for i, tx := range transactions[1:] {
			for _, txIn := range tx.MsgTx().TxIn {
				// It is acceptable for a transaction input to reference
				// the output of another transaction in this block only
				// if the referenced transaction comes before the
				// current one in this block.  Add the outputs of the
				// referenced transaction as available utxos when this
				// is the case.  Otherwise, the utxo details are still
				// needed.
				//
				// NOTE: The >= is correct here because i is one less
				// than the actual position of the transaction within
				// the block due to skipping the coinbase.
				originHash := &txIn.PreviousOutPoint.Hash
				if inFlightIndex, ok := txInFlight[*originHash]; ok &&
					i >= inFlightIndex {

					originTx := transactions[inFlightIndex]
					view.AddTxOuts(originTx, block.Height(), uint32(i))
					continue
				}

				// Don't request entries that are already in the view
				// from the database.
				if _, ok := view.entries[*originHash]; ok {
					continue
				}

				txNeededSet[*originHash] = struct{}{}
			}
		}

		// Request the input utxos from the database.
		return view.fetchUtxosMain(db, txNeededSet)
	}

	// TODO actual blockchain error
	return fmt.Errorf("invalid stake viewpoint")
}
Ejemplo n.º 20
0
// disconnectTransactions updates the view by removing all of the transactions
// created by the passed block, restoring all utxos the transactions spent by
// using the provided spent txo information, and setting the best hash for the
// view to the block before the passed block.
//
// This function will ONLY work correctly for a single transaction tree at a
// time because of index tracking.
func (b *BlockChain) disconnectTransactions(view *UtxoViewpoint,
	block *dcrutil.Block, parent *dcrutil.Block, stxos []spentTxOut) error {
	// Sanity check the correct number of stxos are provided.
	if len(stxos) != countSpentOutputs(block, parent) {
		return AssertError(fmt.Sprintf("disconnectTransactions "+
			"called with bad spent transaction out information "+
			"(len stxos %v, count is %v)", len(stxos),
			countSpentOutputs(block, parent)))
	}

	// Loop backwards through all transactions so everything is unspent in
	// reverse order.  This is necessary since transactions later in a block
	// can spend from previous ones.
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	thisNodeStakeViewpoint := ViewpointPrevInvalidStake
	if regularTxTreeValid {
		thisNodeStakeViewpoint = ViewpointPrevValidStake
	}
	view.SetStakeViewpoint(thisNodeStakeViewpoint)
	err := view.fetchInputUtxos(b.db, block, parent)
	if err != nil {
		return err
	}
	stxoIdx := len(stxos) - 1
	transactions := block.STransactions()
	for txIdx := len(transactions) - 1; txIdx > -1; txIdx-- {
		tx := transactions[txIdx]
		msgTx := tx.MsgTx()
		tt := stake.DetermineTxType(msgTx)

		// Clear this transaction from the view if it already exists or
		// create a new empty entry for when it does not.  This is done
		// because the code relies on its existence in the view in order
		// to signal modifications have happened.
		entry := view.entries[*tx.Sha()]
		if entry == nil {
			entry = newUtxoEntry(msgTx.Version, uint32(block.Height()),
				uint32(txIdx), IsCoinBaseTx(msgTx), msgTx.Expiry != 0, tt)
			if tt == stake.TxTypeSStx {
				stakeExtra := make([]byte, serializeSizeForMinimalOutputs(tx))
				putTxToMinimalOutputs(stakeExtra, tx)
				entry.stakeExtra = stakeExtra
			}
			view.entries[*tx.Sha()] = entry
		}
		entry.modified = true
		entry.sparseOutputs = make(map[uint32]*utxoOutput)

		// Loop backwards through all of the transaction inputs (except
		// for the coinbase which has no inputs) and unspend the
		// referenced txos.  This is necessary to match the order of the
		// spent txout entries.
		for txInIdx := len(tx.MsgTx().TxIn) - 1; txInIdx > -1; txInIdx-- {
			// Skip empty vote stakebases.
			if txInIdx == 0 && (tt == stake.TxTypeSSGen) {
				continue
			}

			// Ensure the spent txout index is decremented to stay
			// in sync with the transaction input.
			stxo := &stxos[stxoIdx]
			stxoIdx--

			// When there is not already an entry for the referenced
			// transaction in the view, it means it was fully spent,
			// so create a new utxo entry in order to resurrect it.
			txIn := tx.MsgTx().TxIn[txInIdx]
			originHash := &txIn.PreviousOutPoint.Hash
			originIndex := txIn.PreviousOutPoint.Index
			entry := view.LookupEntry(originHash)
			if entry == nil {
				if !stxo.txFullySpent {
					return AssertError(fmt.Sprintf("tried to revive utx %v from "+
						"non-fully spent stx entry", originHash))
				}

				entry = newUtxoEntry(tx.MsgTx().Version, stxo.height,
					stxo.index, stxo.isCoinBase, stxo.hasExpiry,
					stxo.txType)
				if stxo.txType == stake.TxTypeSStx {
					entry.stakeExtra = stxo.stakeExtra
				}
				view.entries[*originHash] = entry
			}

			// Mark the entry as modified since it is either new
			// or will be changed below.
			entry.modified = true

			// Restore the specific utxo using the stxo data from
			// the spend journal if it doesn't already exist in the
			// view.
			output, ok := entry.sparseOutputs[originIndex]
			if !ok {
				// Add the unspent transaction output.
				entry.sparseOutputs[originIndex] = &utxoOutput{
					compressed:    stxo.compressed,
					spent:         false,
					amount:        txIn.ValueIn,
					scriptVersion: stxo.scriptVersion,
					pkScript:      stxo.pkScript,
				}
				continue
			}

			// Mark the existing referenced transaction output as
			// unspent.
			output.spent = false
		}
	}

	// There is no regular tx from before the genesis block, so ignore the genesis
	// block for the next step.
	if parent != nil && block.Height() != 0 {
		// Only bother to unspend transactions if the parent's tx tree was
		// validated. Otherwise, these transactions were never in the blockchain's
		// history in the first place.
		if regularTxTreeValid {
			view.SetStakeViewpoint(ViewpointPrevValidInitial)
			err = view.fetchInputUtxos(b.db, block, parent)
			if err != nil {
				return err
			}

			transactions := parent.Transactions()
			for txIdx := len(transactions) - 1; txIdx > -1; txIdx-- {
				tx := transactions[txIdx]

				// Clear this transaction from the view if it already exists or
				// create a new empty entry for when it does not.  This is done
				// because the code relies on its existence in the view in order
				// to signal modifications have happened.
				isCoinbase := txIdx == 0
				entry := view.entries[*tx.Sha()]
				if entry == nil {
					entry = newUtxoEntry(tx.MsgTx().Version,
						uint32(parent.Height()), uint32(txIdx), isCoinbase,
						tx.MsgTx().Expiry != 0, stake.TxTypeRegular)
					view.entries[*tx.Sha()] = entry
				}
				entry.modified = true
				entry.sparseOutputs = make(map[uint32]*utxoOutput)

				// Loop backwards through all of the transaction inputs (except
				// for the coinbase which has no inputs) and unspend the
				// referenced txos.  This is necessary to match the order of the
				// spent txout entries.
				if isCoinbase {
					continue
				}
				for txInIdx := len(tx.MsgTx().TxIn) - 1; txInIdx > -1; txInIdx-- {
					// Ensure the spent txout index is decremented to stay
					// in sync with the transaction input.
					stxo := &stxos[stxoIdx]
					stxoIdx--

					// When there is not already an entry for the referenced
					// transaction in the view, it means it was fully spent,
					// so create a new utxo entry in order to resurrect it.
					txIn := tx.MsgTx().TxIn[txInIdx]
					originHash := &txIn.PreviousOutPoint.Hash
					originIndex := txIn.PreviousOutPoint.Index
					entry := view.entries[*originHash]
					if entry == nil {
						if !stxo.txFullySpent {
							return AssertError(fmt.Sprintf("tried to "+
								"revive utx %v from non-fully spent stx entry",
								originHash))
						}
						entry = newUtxoEntry(tx.MsgTx().Version,
							stxo.height, stxo.index, stxo.isCoinBase,
							stxo.hasExpiry, stxo.txType)
						if stxo.txType == stake.TxTypeSStx {
							entry.stakeExtra = stxo.stakeExtra
						}
						view.entries[*originHash] = entry
					}

					// Mark the entry as modified since it is either new
					// or will be changed below.
					entry.modified = true

					// Restore the specific utxo using the stxo data from
					// the spend journal if it doesn't already exist in the
					// view.
					output, ok := entry.sparseOutputs[originIndex]
					if !ok {
						// Add the unspent transaction output.
						entry.sparseOutputs[originIndex] = &utxoOutput{
							compressed:    stxo.compressed,
							spent:         false,
							amount:        txIn.ValueIn,
							scriptVersion: stxo.scriptVersion,
							pkScript:      stxo.pkScript,
						}
						continue
					}

					// Mark the existing referenced transaction output as
					// unspent.
					output.spent = false
				}
			}
		}
	}

	// Update the best hash for view to the previous block since all of the
	// transactions for the current block have been disconnected.
	view.SetBestHash(parent.Sha())
	return nil
}
Ejemplo n.º 21
0
func connectTransactions(txStore TxStore, block *dcrutil.Block, parent *dcrutil.Block) error {
	// There is no regular tx from before the genesis block, so ignore the genesis
	// block for the next step.
	if parent != nil && block.Height() != 0 {
		mBlock := block.MsgBlock()
		votebits := mBlock.Header.VoteBits
		regularTxTreeValid := dcrutil.IsFlagSet16(votebits, dcrutil.BlockValid)

		// Only add the transactions in the event that the parent block's regular
		// tx were validated.
		if regularTxTreeValid {
			// Loop through all of the regular transactions in the block to see if
			// any of them are ones we need to update and spend based on the
			// results map.
			for i, tx := range parent.Transactions() {
				// Update the transaction store with the transaction information
				// if it's one of the requested transactions.
				msgTx := tx.MsgTx()
				if txD, exists := txStore[*tx.Sha()]; exists {
					txD.Tx = tx
					txD.BlockHeight = block.Height() - 1
					txD.BlockIndex = uint32(i)
					txD.Spent = make([]bool, len(msgTx.TxOut))
					txD.Err = nil
				}

				// Spend the origin transaction output.
				for _, txIn := range msgTx.TxIn {
					originHash := &txIn.PreviousOutPoint.Hash
					originIndex := txIn.PreviousOutPoint.Index
					if originTx, exists := txStore[*originHash]; exists {
						if originTx.Spent == nil {
							continue
						}
						if originIndex >= uint32(len(originTx.Spent)) {
							continue
						}
						originTx.Spent[originIndex] = true
					}
				}
			}
		}
	}

	// Loop through all of the stake transactions in the block to see if any of
	// them are ones we need to update and spend based on the results map.
	for i, tx := range block.STransactions() {
		// Update the transaction store with the transaction information
		// if it's one of the requested transactions.
		msgTx := tx.MsgTx()
		if txD, exists := txStore[*tx.Sha()]; exists {
			txD.Tx = tx
			txD.BlockHeight = block.Height()
			txD.BlockIndex = uint32(i)
			txD.Spent = make([]bool, len(msgTx.TxOut))
			txD.Err = nil
		}

		// Spend the origin transaction output.
		for _, txIn := range msgTx.TxIn {
			originHash := &txIn.PreviousOutPoint.Hash
			originIndex := txIn.PreviousOutPoint.Index
			if originTx, exists := txStore[*originHash]; exists {
				if originTx.Spent == nil {
					continue
				}
				if originIndex >= uint32(len(originTx.Spent)) {
					continue
				}
				originTx.Spent[originIndex] = true
			}
		}
	}

	return nil
}
Ejemplo n.º 22
0
// disconnectTransactions updates the passed map by undoing transaction and
// spend information for all transactions in the passed block.  Only
// transactions in the passed map are updated.
func disconnectTransactions(txStore TxStore, block *dcrutil.Block, parent *dcrutil.Block) error {
	// Loop through all of the stake transactions in the block to see if any of
	// them are ones that need to be undone based on the transaction store.
	for _, tx := range block.STransactions() {
		// Clear this transaction from the transaction store if needed.
		// Only clear it rather than deleting it because the transaction
		// connect code relies on its presence to decide whether or not
		// to update the store and any transactions which exist on both
		// sides of a fork would otherwise not be updated.
		if txD, exists := txStore[*tx.Sha()]; exists {
			txD.Tx = nil
			txD.BlockHeight = int64(wire.NullBlockHeight)
			txD.BlockIndex = wire.NullBlockIndex
			txD.Spent = nil
			txD.Err = database.ErrTxShaMissing
		}

		// Unspend the origin transaction output.
		for _, txIn := range tx.MsgTx().TxIn {
			originHash := &txIn.PreviousOutPoint.Hash
			originIndex := txIn.PreviousOutPoint.Index
			originTx, exists := txStore[*originHash]
			if exists && originTx.Tx != nil && originTx.Err == nil {
				if originTx.Spent == nil {
					continue
				}
				if originIndex >= uint32(len(originTx.Spent)) {
					continue
				}
				originTx.Spent[originIndex] = false
			}
		}
	}

	// There is no regular tx from before the genesis block, so ignore the genesis
	// block for the next step.
	if parent != nil && block.Height() != 0 {
		mBlock := block.MsgBlock()
		votebits := mBlock.Header.VoteBits
		regularTxTreeValid := dcrutil.IsFlagSet16(votebits, dcrutil.BlockValid)

		// Only bother to unspend transactions if the parent's tx tree was
		// validated. Otherwise, these transactions were never in the blockchain's
		// history in the first place.
		if regularTxTreeValid {
			// Loop through all of the regular transactions in the block to see if
			// any of them are ones that need to be undone based on the
			// transaction store.
			for _, tx := range parent.Transactions() {
				// Clear this transaction from the transaction store if needed.
				// Only clear it rather than deleting it because the transaction
				// connect code relies on its presence to decide whether or not
				// to update the store and any transactions which exist on both
				// sides of a fork would otherwise not be updated.
				if txD, exists := txStore[*tx.Sha()]; exists {
					txD.Tx = nil
					txD.BlockHeight = int64(wire.NullBlockHeight)
					txD.BlockIndex = wire.NullBlockIndex
					txD.Spent = nil
					txD.Err = database.ErrTxShaMissing
				}

				// Unspend the origin transaction output.
				for _, txIn := range tx.MsgTx().TxIn {
					originHash := &txIn.PreviousOutPoint.Hash
					originIndex := txIn.PreviousOutPoint.Index
					originTx, exists := txStore[*originHash]
					if exists && originTx.Tx != nil && originTx.Err == nil {
						if originTx.Spent == nil {
							continue
						}
						if originIndex >= uint32(len(originTx.Spent)) {
							continue
						}
						originTx.Spent[originIndex] = false
					}
				}
			}
		}
	}

	return nil
}
Ejemplo n.º 23
0
// spendTickets transfers tickets from the ticketMap to the spentTicketMap. Useful
// when connecting blocks. Also pushes missed tickets to the missed ticket map.
// usedtickets is a map that contains all tickets that were actually used in SSGen
// votes; all other tickets are considered missed.
//
// This function MUST be called with the tmdb lock held (for writes).
func (tmdb *TicketDB) spendTickets(parentBlock *dcrutil.Block,
	usedTickets map[chainhash.Hash]struct{},
	spendingHashes map[chainhash.Hash]chainhash.Hash) (SStxMemMap, error) {

	// If there is nothing being spent, break.
	if len(spendingHashes) < 1 {
		return nil, nil
	}

	// Make sure there's a bucket in the map for used tickets
	height := parentBlock.Height() + 1
	tmdb.maybeInsertBlock(height)

	tempTickets := make(SStxMemMap)

	// Sort the entire list of tickets lexicographically by sorting
	// each bucket and then appending it to the list.
	totalTickets := 0
	var sortedSlice []*TicketData
	for i := 0; i < BucketsSize; i++ {
		mapLen := len(tmdb.maps.ticketMap[i])
		totalTickets += mapLen
		tempTdSlice := NewTicketDataSlice(mapLen)
		itr := 0 // Iterator
		for _, td := range tmdb.maps.ticketMap[i] {
			tempTdSlice[itr] = td
			itr++
		}
		sort.Sort(tempTdSlice)
		sortedSlice = append(sortedSlice, tempTdSlice...)
	}

	// Use the parent block's header to seed a PRNG that picks the lottery winners.
	ticketsPerBlock := int(tmdb.chainParams.TicketsPerBlock)
	pbhB, err := parentBlock.MsgBlock().Header.Bytes()
	if err != nil {
		return nil, err
	}
	prng := NewHash256PRNG(pbhB)
	ts, err := FindTicketIdxs(int64(totalTickets), ticketsPerBlock, prng)
	if err != nil {
		return nil, err
	}
	ticketsToSpendOrMiss := make([]*TicketData, ticketsPerBlock, ticketsPerBlock)
	for i, idx := range ts {
		ticketsToSpendOrMiss[i] = sortedSlice[idx]
	}

	// Spend or miss these tickets by checking for their existence in the
	// passed usedtickets map.
	tixSpent := 0
	tixMissed := 0
	for _, ticket := range ticketsToSpendOrMiss {
		// Move the ticket from active tickets map into the used tickets map
		// if the ticket was spent.
		_, wasSpent := usedTickets[ticket.SStxHash]

		if wasSpent {
			ticket.Missed = false
			ticket.SpendHash = spendingHashes[ticket.SStxHash]
			err := tmdb.pushSpentTicket(height, ticket)
			if err != nil {
				return nil, err
			}
			err = tmdb.removeLiveTicket(ticket)
			if err != nil {
				return nil, err
			}
			tixSpent++
		} else { // Ticket missed being spent and --> false or nil
			ticket.Missed = true // TODO fix test failure @ L150 due to this
			err := tmdb.pushSpentTicket(height, ticket)
			if err != nil {
				return nil, err
			}
			err = tmdb.pushMissedTicket(ticket)
			if err != nil {
				return nil, err
			}
			err = tmdb.removeLiveTicket(ticket)
			if err != nil {
				return nil, err
			}
			tixMissed++
		}

		// Report on the spent and missed tickets for the block in debug.
		if ticket.Missed {
			log.Debugf("Ticket %v has been missed and expired from "+
				"the lottery pool as a missed ticket", ticket.SStxHash)
		} else {
			log.Debugf("Ticket %v was spent and removed from "+
				"the lottery pool", ticket.SStxHash)
		}

		// Add the ticket to the temporary tickets buffer for later use in
		// map restoration if needed.
		tempTickets[ticket.SStxHash] = ticket
	}

	// Some sanity checks.
	if tixSpent != len(usedTickets) {
		errStr := fmt.Sprintf("spendTickets error, an invalid number %v "+
			"tickets was spent, but %v many tickets should "+
			"have been spent!", tixSpent, len(usedTickets))
		return nil, errors.New(errStr)
	}

	if tixMissed != (ticketsPerBlock - len(usedTickets)) {
		errStr := fmt.Sprintf("spendTickets error, an invalid number %v "+
			"tickets was missed, but %v many tickets should "+
			"have been missed!", tixMissed, ticketsPerBlock-len(usedTickets))
		return nil, errors.New(errStr)
	}

	if (tixSpent + tixMissed) != ticketsPerBlock {
		errStr := fmt.Sprintf("spendTickets error, an invalid number %v "+
			"tickets was spent and missed, but TicketsPerBlock %v many "+
			"tickets should have been spent!", tixSpent, ticketsPerBlock)
		return nil, errors.New(errStr)
	}

	return tempTickets, nil
}
Ejemplo n.º 24
0
// indexBlock extract all of the standard addresses from all of the transactions
// in the passed block and maps each of them to the assocaited transaction using
// the passed map.
func (idx *AddrIndex) indexBlock(data writeIndexData, block, parent *dcrutil.Block, view *blockchain.UtxoViewpoint) {
	regularTxTreeValid := dcrutil.IsFlagSet16(block.MsgBlock().Header.VoteBits,
		dcrutil.BlockValid)
	var stakeStartIdx int
	if regularTxTreeValid {
		for txIdx, tx := range parent.Transactions() {
			// Coinbases do not reference any inputs.  Since the block is
			// required to have already gone through full validation, it has
			// already been proven on the first transaction in the block is
			// a coinbase.
			if txIdx != 0 {
				for _, txIn := range tx.MsgTx().TxIn {
					// The view should always have the input since
					// the index contract requires it, however, be
					// safe and simply ignore any missing entries.
					origin := &txIn.PreviousOutPoint
					entry := view.LookupEntry(&origin.Hash)
					if entry == nil {
						log.Warnf("Missing input %v for tx %v while "+
							"indexing block %v (height %v)\n", origin.Hash,
							tx.Sha(), block.Sha(), block.Height())
						continue
					}

					version := entry.ScriptVersionByIndex(origin.Index)
					pkScript := entry.PkScriptByIndex(origin.Index)
					txType := entry.TransactionType()
					idx.indexPkScript(data, version, pkScript, txIdx,
						txType == stake.TxTypeSStx)
				}
			}

			for _, txOut := range tx.MsgTx().TxOut {
				idx.indexPkScript(data, txOut.Version, txOut.PkScript, txIdx,
					false)
			}
		}

		stakeStartIdx = len(parent.Transactions())
	}

	for txIdx, tx := range block.STransactions() {
		msgTx := tx.MsgTx()
		thisTxOffset := txIdx + stakeStartIdx

		isSSGen, _ := stake.IsSSGen(msgTx)
		for i, txIn := range msgTx.TxIn {
			// Skip stakebases.
			if isSSGen && i == 0 {
				continue
			}

			// The view should always have the input since
			// the index contract requires it, however, be
			// safe and simply ignore any missing entries.
			origin := &txIn.PreviousOutPoint
			entry := view.LookupEntry(&origin.Hash)
			if entry == nil {
				log.Warnf("Missing input %v for tx %v while "+
					"indexing block %v (height %v)\n", origin.Hash,
					tx.Sha(), block.Sha(), block.Height())
				continue
			}

			version := entry.ScriptVersionByIndex(origin.Index)
			pkScript := entry.PkScriptByIndex(origin.Index)
			txType := entry.TransactionType()
			idx.indexPkScript(data, version, pkScript, thisTxOffset,
				txType == stake.TxTypeSStx)
		}

		isSStx, _ := stake.IsSStx(msgTx)
		for _, txOut := range msgTx.TxOut {
			idx.indexPkScript(data, txOut.Version, txOut.PkScript,
				thisTxOffset, isSStx)
		}
	}
}