Exemplo n.º 1
0
// fetchTxStoreMain fetches transaction data about the provided set of
// transactions from the point of view of the end of the main chain.  It takes
// a flag which specifies whether or not fully spent transaction should be
// included in the results.
func fetchTxStoreMain(db database.Db, txSet map[btcwire.ShaHash]struct{}, includeSpent bool) TxStore {
	// Just return an empty store now if there are no requested hashes.
	txStore := make(TxStore)
	if len(txSet) == 0 {
		return txStore
	}

	// The transaction store map needs to have an entry for every requested
	// transaction.  By default, all the transactions are marked as missing.
	// Each entry will be filled in with the appropriate data below.
	txList := make([]*btcwire.ShaHash, 0, len(txSet))
	for hash := range txSet {
		hashCopy := hash
		txStore[hash] = &TxData{Hash: &hashCopy, Err: database.ErrTxShaMissing}
		txList = append(txList, &hashCopy)
	}

	// Ask the database (main chain) for the list of transactions.  This
	// will return the information from the point of view of the end of the
	// main chain.  Choose whether or not to include fully spent
	// transactions depending on the passed flag.
	fetchFunc := db.FetchUnSpentTxByShaList
	if includeSpent {
		fetchFunc = db.FetchTxByShaList
	}
	txReplyList := fetchFunc(txList)
	for _, txReply := range txReplyList {
		// Lookup the existing results entry to modify.  Skip
		// this reply if there is no corresponding entry in
		// the transaction store map which really should not happen, but
		// be safe.
		txD, ok := txStore[*txReply.Sha]
		if !ok {
			continue
		}

		// Fill in the transaction details.  A copy is used here since
		// there is no guarantee the returned data isn't cached and
		// this code modifies the data.  A bug caused by modifying the
		// cached data would likely be difficult to track down and could
		// cause subtle errors, so avoid the potential altogether.
		txD.Err = txReply.Err
		if txReply.Err == nil {
			txD.Tx = btcutil.NewTx(txReply.Tx)
			txD.BlockHeight = txReply.Height
			txD.Spent = make([]bool, len(txReply.TxSpent))
			copy(txD.Spent, txReply.TxSpent)
		}
	}

	return txStore
}
Exemplo n.º 2
0
// createCoinbaseTx returns a coinbase transaction paying an appropriate subsidy
// based on the passed block height to the provided address.  When the address
// is nil, the coinbase transaction will instead be redeemable by anyone.
//
// See the comment for NewBlockTemplate for more information about why the nil
// address handling is useful.
func createCoinbaseTx(coinbaseScript []byte, nextBlockHeight int64, addr btcutil.Address) (*btcutil.Tx, error) {
	// Create the script to pay to the provided payment address if one was
	// specified.  Otherwise create a script that allows the coinbase to be
	// redeemable by anyone.
	var pkScript []byte
	if addr != nil {
		var err error
		pkScript, err = txscript.PayToAddrScript(addr)
		if err != nil {
			return nil, err
		}
	} else {
		var err error
		scriptBuilder := txscript.NewScriptBuilder()
		pkScript, err = scriptBuilder.AddOp(txscript.OP_TRUE).Script()
		if err != nil {
			return nil, err
		}
	}

	tx := btcwire.NewMsgTx()
	tx.AddTxIn(&btcwire.TxIn{
		// Coinbase transactions have no inputs, so previous outpoint is
		// zero hash and max index.
		PreviousOutPoint: *btcwire.NewOutPoint(&btcwire.ShaHash{},
			btcwire.MaxPrevOutIndex),
		SignatureScript: coinbaseScript,
		Sequence:        btcwire.MaxTxInSequenceNum,
	})
	tx.AddTxOut(&btcwire.TxOut{
		Value: blockchain.CalcBlockSubsidy(nextBlockHeight,
			activeNetParams.Params),
		PkScript: pkScript,
	})
	return btcutil.NewTx(tx), nil
}
Exemplo n.º 3
0
// TestCheckSerializedHeight tests the checkSerializedHeight function with
// various serialized heights and also does negative tests to ensure errors
// and handled properly.
func TestCheckSerializedHeight(t *testing.T) {
	// Create an empty coinbase template to be used in the tests below.
	coinbaseOutpoint := btcwire.NewOutPoint(&btcwire.ShaHash{}, math.MaxUint32)
	coinbaseTx := btcwire.NewMsgTx()
	coinbaseTx.Version = 2
	coinbaseTx.AddTxIn(btcwire.NewTxIn(coinbaseOutpoint, nil))

	// Expected rule errors.
	missingHeightError := blockchain.RuleError{
		ErrorCode: blockchain.ErrMissingCoinbaseHeight,
	}
	badHeightError := blockchain.RuleError{
		ErrorCode: blockchain.ErrBadCoinbaseHeight,
	}

	tests := []struct {
		sigScript  []byte // Serialized data
		wantHeight int64  // Expected height
		err        error  // Expected error type
	}{
		// No serialized height length.
		{[]byte{}, 0, missingHeightError},
		// Serialized height length with no height bytes.
		{[]byte{0x02}, 0, missingHeightError},
		// Serialized height length with too few height bytes.
		{[]byte{0x02, 0x4a}, 0, missingHeightError},
		// Serialized height that needs 2 bytes to encode.
		{[]byte{0x02, 0x4a, 0x52}, 21066, nil},
		// Serialized height that needs 2 bytes to encode, but backwards
		// endianness.
		{[]byte{0x02, 0x4a, 0x52}, 19026, badHeightError},
		// Serialized height that needs 3 bytes to encode.
		{[]byte{0x03, 0x40, 0x0d, 0x03}, 200000, nil},
		// Serialized height that needs 3 bytes to encode, but backwards
		// endianness.
		{[]byte{0x03, 0x40, 0x0d, 0x03}, 1074594560, badHeightError},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		msgTx := coinbaseTx.Copy()
		msgTx.TxIn[0].SignatureScript = test.sigScript
		tx := btcutil.NewTx(msgTx)

		err := blockchain.TstCheckSerializedHeight(tx, test.wantHeight)
		if reflect.TypeOf(err) != reflect.TypeOf(test.err) {
			t.Errorf("checkSerializedHeight #%d wrong error type "+
				"got: %v <%T>, want: %T", i, err, err, test.err)
			continue
		}

		if rerr, ok := err.(blockchain.RuleError); ok {
			trerr := test.err.(blockchain.RuleError)
			if rerr.ErrorCode != trerr.ErrorCode {
				t.Errorf("checkSerializedHeight #%d wrong "+
					"error code got: %v, want: %v", i,
					rerr.ErrorCode, trerr.ErrorCode)
				continue
			}
		}
	}
}
Exemplo n.º 4
0
// loadTxStore returns a transaction store loaded from a file.
func loadTxStore(filename string) (blockchain.TxStore, error) {
	// The txstore file format is:
	// <num tx data entries> <tx length> <serialized tx> <blk height>
	// <num spent bits> <spent bits>
	//
	// All num and length fields are little-endian uint32s.  The spent bits
	// field is padded to a byte boundary.

	filename = filepath.Join("testdata/", filename)
	fi, err := os.Open(filename)
	if err != nil {
		return nil, err
	}

	// Choose read based on whether the file is compressed or not.
	var r io.Reader
	if strings.HasSuffix(filename, ".bz2") {
		r = bzip2.NewReader(fi)
	} else {
		r = fi
	}
	defer fi.Close()

	// Num of transaction store objects.
	var numItems uint32
	if err := binary.Read(r, binary.LittleEndian, &numItems); err != nil {
		return nil, err
	}

	txStore := make(blockchain.TxStore)
	var uintBuf uint32
	for height := uint32(0); height < numItems; height++ {
		txD := blockchain.TxData{}

		// Serialized transaction length.
		err = binary.Read(r, binary.LittleEndian, &uintBuf)
		if err != nil {
			return nil, err
		}
		serializedTxLen := uintBuf
		if serializedTxLen > btcwire.MaxBlockPayload {
			return nil, fmt.Errorf("Read serialized transaction "+
				"length of %d is larger max allowed %d",
				serializedTxLen, btcwire.MaxBlockPayload)
		}

		// Transaction.
		var msgTx btcwire.MsgTx
		err = msgTx.Deserialize(r)
		if err != nil {
			return nil, err
		}
		txD.Tx = btcutil.NewTx(&msgTx)

		// Transaction hash.
		txHash, err := msgTx.TxSha()
		if err != nil {
			return nil, err
		}
		txD.Hash = &txHash

		// Block height the transaction came from.
		err = binary.Read(r, binary.LittleEndian, &uintBuf)
		if err != nil {
			return nil, err
		}
		txD.BlockHeight = int64(uintBuf)

		// Num spent bits.
		err = binary.Read(r, binary.LittleEndian, &uintBuf)
		if err != nil {
			return nil, err
		}
		numSpentBits := uintBuf
		numSpentBytes := numSpentBits / 8
		if numSpentBits%8 != 0 {
			numSpentBytes++
		}

		// Packed spent bytes.
		spentBytes := make([]byte, numSpentBytes)
		_, err = io.ReadFull(r, spentBytes)
		if err != nil {
			return nil, err
		}

		// Populate spent data based on spent bits.
		txD.Spent = make([]bool, numSpentBits)
		for byteNum, spentByte := range spentBytes {
			for bit := 0; bit < 8; bit++ {
				if uint32((byteNum*8)+bit) < numSpentBits {
					if spentByte&(1<<uint(bit)) != 0 {
						txD.Spent[(byteNum*8)+bit] = true
					}
				}
			}
		}

		txStore[*txD.Hash] = &txD
	}

	return txStore, nil
}