Exemplo n.º 1
0
// 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 := btcwire.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 {
		for _, txIn := range txDesc.Tx.MsgTx().TxIn {
			delete(mp.outpoints, txIn.PreviousOutPoint)
		}
		delete(mp.pool, *txHash)
		mp.lastUpdated = time.Now()
	}
}
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
func Test_dupTx(t *testing.T) {

	// Ignore db remove errors since it means we didn't have an old one.
	dbname := fmt.Sprintf("tstdbdup0")
	dbnamever := dbname + ".ver"
	_ = os.RemoveAll(dbname)
	_ = os.RemoveAll(dbnamever)
	db, err := database.CreateDB("leveldb", dbname)
	if err != nil {
		t.Errorf("Failed to open test database %v", err)
		return
	}
	defer os.RemoveAll(dbname)
	defer os.RemoveAll(dbnamever)
	defer func() {
		if err := db.Close(); err != nil {
			t.Errorf("Close: unexpected error: %v", err)
		}
	}()

	testdatafile := filepath.Join("testdata", "blocks1-256.bz2")
	blocks, err := loadBlocks(t, testdatafile)
	if err != nil {
		t.Errorf("Unable to load blocks from test data for: %v",
			err)
		return
	}

	var lastSha *btcwire.ShaHash

	// Populate with the fisrt 256 blocks, so we have blocks to 'mess with'
	err = nil
out:
	for height := int64(0); height < int64(len(blocks)); height++ {
		block := blocks[height]

		// except for NoVerify which does not allow lookups check inputs
		mblock := block.MsgBlock()
		var txneededList []*btcwire.ShaHash
		for _, tx := range mblock.Transactions {
			for _, txin := range tx.TxIn {
				if txin.PreviousOutPoint.Index == uint32(4294967295) {
					continue
				}
				origintxsha := &txin.PreviousOutPoint.Hash
				txneededList = append(txneededList, origintxsha)

				exists, err := db.ExistsTxSha(origintxsha)
				if err != nil {
					t.Errorf("ExistsTxSha: unexpected error %v ", err)
				}
				if !exists {
					t.Errorf("referenced tx not found %v ", origintxsha)
				}

				_, err = db.FetchTxBySha(origintxsha)
				if err != nil {
					t.Errorf("referenced tx not found %v err %v ", origintxsha, err)
				}
			}
		}
		txlist := db.FetchUnSpentTxByShaList(txneededList)
		for _, txe := range txlist {
			if txe.Err != nil {
				t.Errorf("tx list fetch failed %v err %v ", txe.Sha, txe.Err)
				break out
			}
		}

		newheight, err := db.InsertBlock(block)
		if err != nil {
			t.Errorf("failed to insert block %v err %v", height, err)
			break out
		}
		if newheight != height {
			t.Errorf("height mismatch expect %v returned %v", height, newheight)
			break out
		}

		newSha, blkid, err := db.NewestSha()
		if err != nil {
			t.Errorf("failed to obtain latest sha %v %v", height, err)
		}

		if blkid != height {
			t.Errorf("height doe not match latest block height %v %v %v", blkid, height, err)
		}

		blkSha, _ := block.Sha()
		if *newSha != *blkSha {
			t.Errorf("Newest block sha does not match freshly inserted one %v %v %v ", newSha, blkSha, err)
		}
		lastSha = blkSha
	}

	// generate a new block based on the last sha
	// these block are not verified, so there are a bunch of garbage fields
	// in the 'generated' block.

	var bh btcwire.BlockHeader

	bh.Version = 2
	bh.PrevBlock = *lastSha
	// Bits, Nonce are not filled in

	mblk := btcwire.NewMsgBlock(&bh)

	hash, _ := btcwire.NewShaHashFromStr("df2b060fa2e5e9c8ed5eaf6a45c13753ec8c63282b2688322eba40cd98ea067a")

	po := btcwire.NewOutPoint(hash, 0)
	txI := btcwire.NewTxIn(po, []byte("garbage"))
	txO := btcwire.NewTxOut(50000000, []byte("garbageout"))

	var tx btcwire.MsgTx
	tx.AddTxIn(txI)
	tx.AddTxOut(txO)

	mblk.AddTransaction(&tx)

	blk := btcutil.NewBlock(mblk)

	fetchList := []*btcwire.ShaHash{hash}
	listReply := db.FetchUnSpentTxByShaList(fetchList)
	for _, lr := range listReply {
		if lr.Err != nil {
			t.Errorf("sha %v spent %v err %v\n", lr.Sha,
				lr.TxSpent, lr.Err)
		}
	}

	_, err = db.InsertBlock(blk)
	if err != nil {
		t.Errorf("failed to insert phony block %v", err)
	}

	// ok, did it 'spend' the tx ?

	listReply = db.FetchUnSpentTxByShaList(fetchList)
	for _, lr := range listReply {
		if lr.Err != database.ErrTxShaMissing {
			t.Errorf("sha %v spent %v err %v\n", lr.Sha,
				lr.TxSpent, lr.Err)
		}
	}

	txlist := blk.Transactions()
	for _, tx := range txlist {
		txsha := tx.Sha()
		txReply, err := db.FetchTxBySha(txsha)
		if err != nil {
			t.Errorf("fully spent lookup %v err %v\n", hash, err)
		} else {
			for _, lr := range txReply {
				if lr.Err != nil {
					fmt.Errorf("stx %v spent %v err %v\n", lr.Sha,
						lr.TxSpent, lr.Err)
				}
			}
		}
	}

	t.Logf("Dropping block")

	err = db.DropAfterBlockBySha(lastSha)
	if err != nil {
		t.Errorf("failed to drop spending block %v", err)
	}
}
Exemplo n.º 4
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 *btcutil.Block) (height int64, rerr error) {
	db.dbLock.Lock()
	defer db.dbLock.Unlock()
	defer func() {
		if rerr == nil {
			rerr = db.processBatches()
		} else {
			db.lBatch().Reset()
		}
	}()

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

	// At least two blocks in the long past were generated by faulty
	// miners, the sha of the transaction exists in a previous block,
	// detect this condition and 'accept' the block.
	for txidx, tx := range mblock.Transactions {
		txsha, err := block.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)
			}
		}

		err = db.insertTx(txsha, newheight, 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, &txsha, txidx, err)
			return 0, err
		}

		// Some old blocks contain duplicate transactions
		// Attempt to cleanly bypass this problem by marking the
		// first as fully spent.
		// http://blockexplorer.com/b/91812 dup in 91842
		// http://blockexplorer.com/b/91722 dup in 91880
		if newheight == 91812 {
			dupsha, err := btcwire.NewShaHashFromStr("d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599")
			if err != nil {
				panic("invalid sha string in source")
			}
			if txsha.IsEqual(dupsha) {
				// marking TxOut[0] as spent
				po := btcwire.NewOutPoint(dupsha, 0)
				txI := btcwire.NewTxIn(po, []byte("garbage"))

				var spendtx btcwire.MsgTx
				spendtx.AddTxIn(txI)
				err = db.doSpend(&spendtx)
				if err != nil {
					log.Warnf("block %v idx %v failed to spend tx %v %v err %v", blocksha, newheight, &txsha, txidx, err)
				}
			}
		}
		if newheight == 91722 {
			dupsha, err := btcwire.NewShaHashFromStr("e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468")
			if err != nil {
				panic("invalid sha string in source")
			}
			if txsha.IsEqual(dupsha) {
				// marking TxOut[0] as spent
				po := btcwire.NewOutPoint(dupsha, 0)
				txI := btcwire.NewTxIn(po, []byte("garbage"))

				var spendtx btcwire.MsgTx
				spendtx.AddTxIn(txI)
				err = db.doSpend(&spendtx)
				if err != nil {
					log.Warnf("block %v idx %v failed to spend tx %v %v err %v", blocksha, newheight, &txsha, txidx, 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
		}
	}
	return newheight, nil
}
Exemplo n.º 5
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
			}
		}
	}
}