Golang Tx.Sha方法代碼示例

// removeTransaction is the internal function which implements the public
// RemoveTransaction.  See the comment for RemoveTransaction for more details.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) removeTransaction(tx *btcutil.Tx, removeRedeemers bool) {
	txHash := tx.Sha()
	if removeRedeemers {
		// Remove any transactions which rely on this one.
		for i := uint32(0); i < uint32(len(tx.MsgTx().TxOut)); i++ {
			outpoint := wire.NewOutPoint(txHash, i)
			if txRedeemer, exists := mp.outpoints[*outpoint]; exists {
				mp.removeTransaction(txRedeemer, true)
			}
		}
	}

	// Remove the transaction and mark the referenced outpoints as unspent
	// by the pool.
	if txDesc, exists := mp.pool[*txHash]; exists {
		if mp.cfg.EnableAddrIndex {
			mp.removeTransactionFromAddrIndex(tx)
		}

		for _, txIn := range txDesc.Tx.MsgTx().TxIn {
			delete(mp.outpoints, txIn.PreviousOutPoint)
		}
		delete(mp.pool, *txHash)
		atomic.StoreInt64(&mp.lastUpdated, time.Now().Unix())
	}

}

// CountP2SHSigOps returns the number of signature operations for all input
// transactions which are of the pay-to-script-hash type.  This uses the
// precise, signature operation counting mechanism from the script engine which
// requires access to the input transaction scripts.
func CountP2SHSigOps(tx *btcutil.Tx, isCoinBaseTx bool, txStore TxStore) (int, error) {
	// Coinbase transactions have no interesting inputs.
	if isCoinBaseTx {
		return 0, nil
	}

	// Accumulate the number of signature operations in all transaction
	// inputs.
	msgTx := tx.MsgTx()
	totalSigOps := 0
	for _, txIn := range msgTx.TxIn {
		// Ensure the referenced input transaction is available.
		txInHash := &txIn.PreviousOutPoint.Hash
		originTx, exists := txStore[*txInHash]
		if !exists || originTx.Err != nil || originTx.Tx == nil {
			str := fmt.Sprintf("unable to find input transaction "+
				"%v referenced from transaction %v", txInHash,
				tx.Sha())
			return 0, ruleError(ErrMissingTx, str)
		}
		originMsgTx := originTx.Tx.MsgTx()

		// Ensure the output index in the referenced transaction is
		// available.
		originTxIndex := txIn.PreviousOutPoint.Index
		if originTxIndex >= uint32(len(originMsgTx.TxOut)) {
			str := fmt.Sprintf("out of bounds input index %d in "+
				"transaction %v referenced from transaction %v",
				originTxIndex, txInHash, tx.Sha())
			return 0, ruleError(ErrBadTxInput, str)
		}

		// We're only interested in pay-to-script-hash types, so skip
		// this input if it's not one.
		pkScript := originMsgTx.TxOut[originTxIndex].PkScript
		if !txscript.IsPayToScriptHash(pkScript) {
			continue
		}

		// Count the precise number of signature operations in the
		// referenced public key script.
		sigScript := txIn.SignatureScript
		numSigOps := txscript.GetPreciseSigOpCount(sigScript, pkScript,
			true)

		// We could potentially overflow the accumulator so check for
		// overflow.
		lastSigOps := totalSigOps
		totalSigOps += numSigOps
		if totalSigOps < lastSigOps {
			str := fmt.Sprintf("the public key script from "+
				"output index %d in transaction %v contains "+
				"too many signature operations - overflow",
				originTxIndex, txInHash)
			return 0, ruleError(ErrTooManySigOps, str)
		}
	}

	return totalSigOps, nil
}

// removeTransaction is the internal function which implements the public
// RemoveTransaction.  See the comment for RemoveTransaction for more details.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) removeTransaction(tx *btcutil.Tx, removeRedeemers bool) {
	txHash := tx.Sha()
	if removeRedeemers {
		// Remove any transactions which rely on this one.
		for i := uint32(0); i < uint32(len(tx.MsgTx().TxOut)); i++ {
			outpoint := wire.NewOutPoint(txHash, i)
			if txRedeemer, exists := mp.outpoints[*outpoint]; exists {
				mp.removeTransaction(txRedeemer, true)
			}
		}
	}

	// Remove the transaction if needed.
	if txDesc, exists := mp.pool[*txHash]; exists {
		// Remove unconfirmed address index entries associated with the
		// transaction if enabled.
		if mp.cfg.AddrIndex != nil {
			mp.cfg.AddrIndex.RemoveUnconfirmedTx(txHash)
		}

		// Mark the referenced outpoints as unspent by the pool.
		for _, txIn := range txDesc.Tx.MsgTx().TxIn {
			delete(mp.outpoints, txIn.PreviousOutPoint)
		}
		delete(mp.pool, *txHash)
		atomic.StoreInt64(&mp.lastUpdated, time.Now().Unix())
	}
}

// removeTransaction is the internal function which implements the public
// RemoveTransaction.  See the comment for RemoveTransaction for more details.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) removeTransaction(tx *btcutil.Tx) {
	// Remove any transactions which rely on this one.
	txHash := tx.Sha()
	for i := uint32(0); i < uint32(len(tx.MsgTx().TxOut)); i++ {
		outpoint := wire.NewOutPoint(txHash, i)
		if txRedeemer, exists := mp.outpoints[*outpoint]; exists {
			mp.removeTransaction(txRedeemer)
		}
	}

	// Remove the transaction and mark the referenced outpoints as unspent
	// by the pool.
	if txDesc, exists := mp.pool[*txHash]; exists {
		if cfg.AddrIndex {
			mp.removeTransactionFromAddrIndex(tx)
		}

		for _, txIn := range txDesc.Tx.MsgTx().TxIn {
			delete(mp.outpoints, txIn.PreviousOutPoint)
		}
		delete(mp.pool, *txHash)
		mp.lastUpdated = time.Now()
	}

}

// matchTxAndUpdate returns true if the bloom filter matches data within the
// passed transaction, otherwise false is returned.  If the filter does match
// the passed transaction, it will also update the filter depending on the bloom
// update flags set via the loaded filter if needed.
//
// This function MUST be called with the filter lock held.
func (bf *Filter) matchTxAndUpdate(tx *btcutil.Tx) bool {
	// Check if the filter matches the hash of the transaction.
	// This is useful for finding transactions when they appear in a block.
	matched := bf.matches(tx.Sha()[:])

	// Check if the filter matches any data elements in the public key
	// scripts of any of the outputs.  When it does, add the outpoint that
	// matched so transactions which spend from the matched transaction are
	// also included in the filter.  This removes the burden of updating the
	// filter for this scenario from the client.  It is also more efficient
	// on the network since it avoids the need for another filteradd message
	// from the client and avoids some potential races that could otherwise
	// occur.
	for i, txOut := range tx.MsgTx().TxOut {
		pushedData, err := txscript.PushedData(txOut.PkScript)
		if err != nil {
			continue
		}

		for _, data := range pushedData {
			if !bf.matches(data) {
				continue
			}

			matched = true
			bf.maybeAddOutpoint(txOut.PkScript, tx.Sha(), uint32(i))
			break
		}
	}

	// Nothing more to do if a match has already been made.
	if matched {
		return true
	}

	// At this point, the transaction and none of the data elements in the
	// public key scripts of its outputs matched.

	// Check if the filter matches any outpoints this transaction spends or
	// any any data elements in the signature scripts of any of the inputs.
	for _, txin := range tx.MsgTx().TxIn {
		if bf.matchesOutPoint(&txin.PreviousOutPoint) {
			return true
		}

		pushedData, err := txscript.PushedData(txin.SignatureScript)
		if err != nil {
			continue
		}
		for _, data := range pushedData {
			if bf.matches(data) {
				return true
			}
		}
	}

	return false
}

// getUtxo returns a TxOut from Tx and Vout
func (com *Communication) getUtxo(tx *btcutil.Tx,
	vout *wire.TxOut, index uint32) *TxOut {
	op := wire.NewOutPoint(tx.Sha(), index)
	unspent := TxOut{
		OutPoint: op,
		Amount:   btcutil.Amount(vout.Value),
	}
	return &unspent
}

// logSkippedDeps logs any dependencies which are also skipped as a result of
// skipping a transaction while generating a block template at the trace level.
func logSkippedDeps(tx *btcutil.Tx, deps *list.List) {
	if deps == nil {
		return
	}

	for e := deps.Front(); e != nil; e = e.Next() {
		item := e.Value.(*txPrioItem)
		minrLog.Tracef("Skipping tx %s since it depends on %s\n",
			item.tx.Sha(), tx.Sha())
	}
}

// RemoveDoubleSpends removes all transactions which spend outputs spent by the
// passed transaction from the memory pool.  Removing those transactions then
// leads to removing all transactions which rely on them, recursively.  This is
// necessary when a block is connected to the main chain because the block may
// contain transactions which were previously unknown to the memory pool
//
// This function is safe for concurrent access.
func (mp *txMemPool) RemoveDoubleSpends(tx *btcutil.Tx) {
	// Protect concurrent access.
	mp.Lock()
	defer mp.Unlock()

	for _, txIn := range tx.MsgTx().TxIn {
		if txRedeemer, ok := mp.outpoints[txIn.PreviousOutPoint]; ok {
			if !txRedeemer.Sha().IsEqual(tx.Sha()) {
				mp.removeTransaction(txRedeemer, true)
			}
		}
	}
}

// removeScriptFromAddrIndex dissociates the address encoded by the
// passed pkScript from the passed tx in our address based tx index.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) removeScriptFromAddrIndex(pkScript []byte, tx *btcutil.Tx) error {
	_, addresses, _, err := txscript.ExtractPkScriptAddrs(pkScript,
		activeNetParams.Params)
	if err != nil {
		txmpLog.Errorf("Unable to extract encoded addresses from script "+
			"for addrindex (addrindex): %v", err)
		return err
	}
	for _, addr := range addresses {
		delete(mp.addrindex[addr.EncodeAddress()], *tx.Sha())
	}

	return nil
}

// CountP2SHSigOps returns the number of signature operations for all input
// transactions which are of the pay-to-script-hash type.  This uses the
// precise, signature operation counting mechanism from the script engine which
// requires access to the input transaction scripts.
func CountP2SHSigOps(tx *btcutil.Tx, isCoinBaseTx bool, utxoView *UtxoViewpoint) (int, error) {
	// Coinbase transactions have no interesting inputs.
	if isCoinBaseTx {
		return 0, nil
	}

	// Accumulate the number of signature operations in all transaction
	// inputs.
	msgTx := tx.MsgTx()
	totalSigOps := 0
	for txInIndex, txIn := range msgTx.TxIn {
		// Ensure the referenced input transaction is available.
		originTxHash := &txIn.PreviousOutPoint.Hash
		originTxIndex := txIn.PreviousOutPoint.Index
		txEntry := utxoView.LookupEntry(originTxHash)
		if txEntry == nil || txEntry.IsOutputSpent(originTxIndex) {
			str := fmt.Sprintf("unable to find unspent output "+
				"%v referenced from transaction %s:%d",
				txIn.PreviousOutPoint, tx.Sha(), txInIndex)
			return 0, ruleError(ErrMissingTx, str)
		}

		// We're only interested in pay-to-script-hash types, so skip
		// this input if it's not one.
		pkScript := txEntry.PkScriptByIndex(originTxIndex)
		if !txscript.IsPayToScriptHash(pkScript) {
			continue
		}

		// Count the precise number of signature operations in the
		// referenced public key script.
		sigScript := txIn.SignatureScript
		numSigOps := txscript.GetPreciseSigOpCount(sigScript, pkScript,
			true)

		// We could potentially overflow the accumulator so check for
		// overflow.
		lastSigOps := totalSigOps
		totalSigOps += numSigOps
		if totalSigOps < lastSigOps {
			str := fmt.Sprintf("the public key script from output "+
				"%v contains too many signature operations - "+
				"overflow", txIn.PreviousOutPoint)
			return 0, ruleError(ErrTooManySigOps, str)
		}
	}

	return totalSigOps, nil
}

// FetchTransactionStore fetches the input transactions referenced by the
// passed transaction from the point of view of the end of the main chain.  It
// also attempts to fetch the transaction itself so the returned TxStore can be
// examined for duplicate transactions.
func (b *BlockChain) FetchTransactionStore(tx *btcutil.Tx, includeSpent bool) (TxStore, error) {
	// Create a set of needed transactions from the transactions referenced
	// by the inputs of the passed transaction.  Also, add the passed
	// transaction itself as a way for the caller to detect duplicates.
	txNeededSet := make(map[wire.ShaHash]struct{})
	txNeededSet[*tx.Sha()] = struct{}{}
	for _, txIn := range tx.MsgTx().TxIn {
		txNeededSet[txIn.PreviousOutPoint.Hash] = struct{}{}
	}

	// Request the input transactions from the point of view of the end of
	// the main chain with or without without including fully spent transactions
	// in the results.
	txStore := fetchTxStoreMain(b.db, txNeededSet, includeSpent)
	return txStore, nil
}

// addOrphan adds an orphan transaction to the orphan pool.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) addOrphan(tx *btcutil.Tx) {
	// Limit the number orphan transactions to prevent memory exhaustion.  A
	// random orphan is evicted to make room if needed.
	mp.limitNumOrphans()

	mp.orphans[*tx.Sha()] = tx
	for _, txIn := range tx.MsgTx().TxIn {
		originTxHash := txIn.PreviousOutPoint.Hash
		if mp.orphansByPrev[originTxHash] == nil {
			mp.orphansByPrev[originTxHash] = list.New()
		}
		mp.orphansByPrev[originTxHash].PushBack(tx)
	}

	txmpLog.Debugf("Stored orphan transaction %v (total: %d)", tx.Sha(),
		len(mp.orphans))
}

// addTransaction adds the passed transaction to the memory pool.  It should
// not be called directly as it doesn't perform any validation.  This is a
// helper for maybeAcceptTransaction.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) addTransaction(tx *btcutil.Tx, height int32, fee int64) {
	// Add the transaction to the pool and mark the referenced outpoints
	// as spent by the pool.
	mp.pool[*tx.Sha()] = &TxDesc{
		Tx:     tx,
		Added:  time.Now(),
		Height: height,
		Fee:    fee,
	}
	for _, txIn := range tx.MsgTx().TxIn {
		mp.outpoints[txIn.PreviousOutPoint] = tx
	}
	mp.lastUpdated = time.Now()

	if cfg.AddrIndex {
		mp.addTransactionToAddrIndex(tx)
	}
}

// indexScriptByAddress alters our address index by indexing the payment address
// encoded by the passed scriptPubKey to the passed transaction.
//
// This function MUST be called with the mempool lock held (for writes).
func (mp *txMemPool) indexScriptAddressToTx(pkScript []byte, tx *btcutil.Tx) error {
	_, addresses, _, err := txscript.ExtractPkScriptAddrs(pkScript,
		activeNetParams.Params)
	if err != nil {
		txmpLog.Errorf("Unable to extract encoded addresses from script "+
			"for addrindex: %v", err)
		return err
	}

	for _, addr := range addresses {
		if mp.addrindex[addr.EncodeAddress()] == nil {
			mp.addrindex[addr.EncodeAddress()] = make(map[wire.ShaHash]struct{})
		}
		mp.addrindex[addr.EncodeAddress()][*tx.Sha()] = struct{}{}
	}

	return nil
}

// ProcessTransaction is the main workhorse for handling insertion of new
// free-standing transactions into the memory pool.  It includes functionality
// such as rejecting duplicate transactions, ensuring transactions follow all
// rules, orphan transaction handling, and insertion into the memory pool.
//
// This function is safe for concurrent access.
func (mp *txMemPool) ProcessTransaction(tx *btcutil.Tx, allowOrphan, rateLimit bool) error {
	// Protect concurrent access.
	mp.Lock()
	defer mp.Unlock()

	txmpLog.Tracef("Processing transaction %v", tx.Sha())

	// Potentially accept the transaction to the memory pool.
	missingParents, err := mp.maybeAcceptTransaction(tx, true, rateLimit)
	if err != nil {
		return err
	}

	if len(missingParents) == 0 {
		// Generate the inventory vector and relay it.
		iv := wire.NewInvVect(wire.InvTypeTx, tx.Sha())
		mp.server.RelayInventory(iv, tx)

		// Accept any orphan transactions that depend on this
		// transaction (they may no longer be orphans if all inputs
		// are now available) and repeat for those accepted
		// transactions until there are no more.
		err := mp.processOrphans(tx.Sha())
		if err != nil {
			return err
		}
	} else {
		// The transaction is an orphan (has inputs missing).  Reject
		// it if the flag to allow orphans is not set.
		if !allowOrphan {
			// Only use the first missing parent transaction in
			// the error message.
			//
			// NOTE: RejectDuplicate is really not an accurate
			// reject code here, but it matches the reference
			// implementation and there isn't a better choice due
			// to the limited number of reject codes.  Missing
			// inputs is assumed to mean they are already spent
			// which is not really always the case.
			str := fmt.Sprintf("orphan transaction %v references "+
				"outputs of unknown or fully-spent "+
				"transaction %v", tx.Sha(), missingParents[0])
			return txRuleError(wire.RejectDuplicate, str)
		}

		// Potentially add the orphan transaction to the orphan pool.
		err := mp.maybeAddOrphan(tx)
		if err != nil {
			return err
		}
	}

	return nil
}