// fetchTxDataByLoc returns several pieces of data regarding the given tx
// located by the block/offset/size location
func (db *LevelDb) fetchTxDataByLoc(blkHeight int32, txOff int, txLen int, txspent []byte) (rtx *wire.MsgTx, rblksha *wire.ShaHash, rheight int32, rtxspent []byte, err error) {
	var blksha *wire.ShaHash
	var blkbuf []byte

	blksha, blkbuf, err = db.getBlkByHeight(blkHeight)
	if err != nil {
		if err == leveldb.ErrNotFound {
			err = database.ErrTxShaMissing
		}
		return
	}

	//log.Trace("transaction %v is at block %v %v txoff %v, txlen %v\n",
	//	txsha, blksha, blkHeight, txOff, txLen)

	if len(blkbuf) < txOff+txLen {
		err = database.ErrTxShaMissing
		return
	}
	rbuf := bytes.NewReader(blkbuf[txOff : txOff+txLen])

	var tx wire.MsgTx
	err = tx.Deserialize(rbuf)
	if err != nil {
		log.Warnf("unable to decode tx block %v %v txoff %v txlen %v",
			blkHeight, blksha, txOff, txLen)
		return
	}

	return &tx, blksha, blkHeight, txspent, nil
}

// TestTxSerializeErrors performs negative tests against wire encode and decode
// of MsgTx to confirm error paths work correctly.
func TestTxSerializeErrors(t *testing.T) {
	tests := []struct {
		in       *wire.MsgTx // Value to encode
		buf      []byte      // Serialized data
		max      int         // Max size of fixed buffer to induce errors
		writeErr error       // Expected write error
		readErr  error       // Expected read error
	}{
		// Force error in version.
		{multiTx, multiTxEncoded, 0, io.ErrShortWrite, io.EOF},
		// Force error in number of transaction inputs.
		{multiTx, multiTxEncoded, 4, io.ErrShortWrite, io.EOF},
		// Force error in transaction input previous block hash.
		{multiTx, multiTxEncoded, 5, io.ErrShortWrite, io.EOF},
		// Force error in transaction input previous block output index.
		{multiTx, multiTxEncoded, 37, io.ErrShortWrite, io.EOF},
		// Force error in transaction input signature script length.
		{multiTx, multiTxEncoded, 41, io.ErrShortWrite, io.EOF},
		// Force error in transaction input signature script.
		{multiTx, multiTxEncoded, 42, io.ErrShortWrite, io.EOF},
		// Force error in transaction input sequence.
		{multiTx, multiTxEncoded, 49, io.ErrShortWrite, io.EOF},
		// Force error in number of transaction outputs.
		{multiTx, multiTxEncoded, 53, io.ErrShortWrite, io.EOF},
		// Force error in transaction output value.
		{multiTx, multiTxEncoded, 54, io.ErrShortWrite, io.EOF},
		// Force error in transaction output pk script length.
		{multiTx, multiTxEncoded, 62, io.ErrShortWrite, io.EOF},
		// Force error in transaction output pk script.
		{multiTx, multiTxEncoded, 63, io.ErrShortWrite, io.EOF},
		// Force error in transaction output lock time.
		{multiTx, multiTxEncoded, 206, io.ErrShortWrite, io.EOF},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Serialize the transaction.
		w := newFixedWriter(test.max)
		err := test.in.Serialize(w)
		if err != test.writeErr {
			t.Errorf("Serialize #%d wrong error got: %v, want: %v",
				i, err, test.writeErr)
			continue
		}

		// Deserialize the transaction.
		var tx wire.MsgTx
		r := newFixedReader(test.max, test.buf)
		err = tx.Deserialize(r)
		if err != test.readErr {
			t.Errorf("Deserialize #%d wrong error got: %v, want: %v",
				i, err, test.readErr)
			continue
		}
	}
}

// NewTxFromReader returns a new instance of a bitcoin transaction given a
// Reader to deserialize the transaction.  See Tx.
func NewTxFromReader(r io.Reader) (*Tx, error) {
	// Deserialize the bytes into a MsgTx.
	var msgTx wire.MsgTx
	err := msgTx.Deserialize(r)
	if err != nil {
		return nil, err
	}

	t := Tx{
		msgTx:   &msgTx,
		txIndex: TxIndexUnknown,
	}
	return &t, nil
}

// TestTxOverflowErrors performs tests to ensure deserializing transactions
// which are intentionally crafted to use large values for the variable number
// of inputs and outputs are handled properly.  This could otherwise potentially
// be used as an attack vector.
func TestTxOverflowErrors(t *testing.T) {
	// Use protocol version 70001 and transaction version 1 specifically
	// here instead of the latest values because the test data is using
	// bytes encoded with those versions.
	pver := uint32(70001)
	txVer := uint32(1)

	tests := []struct {
		buf     []byte // Wire encoding
		pver    uint32 // Protocol version for wire encoding
		version uint32 // Transaction version
		err     error  // Expected error
	}{
		// Transaction that claims to have ~uint64(0) inputs.
		{
			[]byte{
				0x00, 0x00, 0x00, 0x01, // Version
				0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
				0xff, // Varint for number of input transactions
			}, pver, txVer, &wire.MessageError{},
		},

		// Transaction that claims to have ~uint64(0) outputs.
		{
			[]byte{
				0x00, 0x00, 0x00, 0x01, // Version
				0x00, // Varint for number of input transactions
				0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
				0xff, // Varint for number of output transactions
			}, pver, txVer, &wire.MessageError{},
		},

		// Transaction that has an input with a signature script that
		// claims to have ~uint64(0) length.
		{
			[]byte{
				0x00, 0x00, 0x00, 0x01, // Version
				0x01, // Varint for number of input transactions
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Previous output hash
				0xff, 0xff, 0xff, 0xff, // Prevous output index
				0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
				0xff, // Varint for length of signature script
			}, pver, txVer, &wire.MessageError{},
		},

		// Transaction that has an output with a public key script
		// that claims to have ~uint64(0) length.
		{
			[]byte{
				0x00, 0x00, 0x00, 0x01, // Version
				0x01, // Varint for number of input transactions
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Previous output hash
				0xff, 0xff, 0xff, 0xff, // Prevous output index
				0x00,                   // Varint for length of signature script
				0xff, 0xff, 0xff, 0xff, // Sequence
				0x01,                                           // Varint for number of output transactions
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Transaction amount
				0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
				0xff, // Varint for length of public key script
			}, pver, txVer, &wire.MessageError{},
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Decode from wire format.
		var msg wire.MsgTx
		r := bytes.NewReader(test.buf)
		err := msg.BtcDecode(r, test.pver)
		if reflect.TypeOf(err) != reflect.TypeOf(test.err) {
			t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
				i, err, reflect.TypeOf(test.err))
			continue
		}

		// Decode from wire format.
		r = bytes.NewReader(test.buf)
		err = msg.Deserialize(r)
		if reflect.TypeOf(err) != reflect.TypeOf(test.err) {
			t.Errorf("Deserialize #%d wrong error got: %v, want: %v",
				i, err, reflect.TypeOf(test.err))
			continue
		}
	}
}

// TestTxSerialize tests MsgTx serialize and deserialize.
func TestTxSerialize(t *testing.T) {
	noTx := wire.NewMsgTx()
	noTx.Version = 1
	noTxEncoded := []byte{
		0x01, 0x00, 0x00, 0x00, // Version
		0x00,                   // Varint for number of input transactions
		0x00,                   // Varint for number of output transactions
		0x00, 0x00, 0x00, 0x00, // Lock time
	}

	tests := []struct {
		in           *wire.MsgTx // Message to encode
		out          *wire.MsgTx // Expected decoded message
		buf          []byte      // Serialized data
		pkScriptLocs []int       // Expected output script locations
	}{
		// No transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			nil,
		},

		// Multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			multiTxPkScriptLocs,
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Serialize the transaction.
		var buf bytes.Buffer
		err := test.in.Serialize(&buf)
		if err != nil {
			t.Errorf("Serialize #%d error %v", i, err)
			continue
		}
		if !bytes.Equal(buf.Bytes(), test.buf) {
			t.Errorf("Serialize #%d\n got: %s want: %s", i,
				spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
			continue
		}

		// Deserialize the transaction.
		var tx wire.MsgTx
		rbuf := bytes.NewReader(test.buf)
		err = tx.Deserialize(rbuf)
		if err != nil {
			t.Errorf("Deserialize #%d error %v", i, err)
			continue
		}
		if !reflect.DeepEqual(&tx, test.out) {
			t.Errorf("Deserialize #%d\n got: %s want: %s", i,
				spew.Sdump(&tx), spew.Sdump(test.out))
			continue
		}

		// Ensure the public key script locations are accurate.
		pkScriptLocs := test.in.PkScriptLocs()
		if !reflect.DeepEqual(pkScriptLocs, test.pkScriptLocs) {
			t.Errorf("PkScriptLocs #%d\n got: %s want: %s", i,
				spew.Sdump(pkScriptLocs),
				spew.Sdump(test.pkScriptLocs))
			continue
		}
		for j, loc := range pkScriptLocs {
			wantPkScript := test.in.TxOut[j].PkScript
			gotPkScript := test.buf[loc : loc+len(wantPkScript)]
			if !bytes.Equal(gotPkScript, wantPkScript) {
				t.Errorf("PkScriptLocs #%d:%d\n unexpected "+
					"script got: %s want: %s", i, j,
					spew.Sdump(gotPkScript),
					spew.Sdump(wantPkScript))
			}
		}
	}
}

// TestTxWireErrors performs negative tests against wire encode and decode
// of MsgTx to confirm error paths work correctly.
func TestTxWireErrors(t *testing.T) {
	// Use protocol version 60002 specifically here instead of the latest
	// because the test data is using bytes encoded with that protocol
	// version.
	pver := uint32(60002)

	tests := []struct {
		in       *wire.MsgTx // Value to encode
		buf      []byte      // Wire encoding
		pver     uint32      // Protocol version for wire encoding
		max      int         // Max size of fixed buffer to induce errors
		writeErr error       // Expected write error
		readErr  error       // Expected read error
	}{
		// Force error in version.
		{multiTx, multiTxEncoded, pver, 0, io.ErrShortWrite, io.EOF},
		// Force error in number of transaction inputs.
		{multiTx, multiTxEncoded, pver, 4, io.ErrShortWrite, io.EOF},
		// Force error in transaction input previous block hash.
		{multiTx, multiTxEncoded, pver, 5, io.ErrShortWrite, io.EOF},
		// Force error in transaction input previous block output index.
		{multiTx, multiTxEncoded, pver, 37, io.ErrShortWrite, io.EOF},
		// Force error in transaction input signature script length.
		{multiTx, multiTxEncoded, pver, 41, io.ErrShortWrite, io.EOF},
		// Force error in transaction input signature script.
		{multiTx, multiTxEncoded, pver, 42, io.ErrShortWrite, io.EOF},
		// Force error in transaction input sequence.
		{multiTx, multiTxEncoded, pver, 49, io.ErrShortWrite, io.EOF},
		// Force error in number of transaction outputs.
		{multiTx, multiTxEncoded, pver, 53, io.ErrShortWrite, io.EOF},
		// Force error in transaction output value.
		{multiTx, multiTxEncoded, pver, 54, io.ErrShortWrite, io.EOF},
		// Force error in transaction output pk script length.
		{multiTx, multiTxEncoded, pver, 62, io.ErrShortWrite, io.EOF},
		// Force error in transaction output pk script.
		{multiTx, multiTxEncoded, pver, 63, io.ErrShortWrite, io.EOF},
		// Force error in transaction output lock time.
		{multiTx, multiTxEncoded, pver, 206, io.ErrShortWrite, io.EOF},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode to wire format.
		w := newFixedWriter(test.max)
		err := test.in.BtcEncode(w, test.pver)
		if err != test.writeErr {
			t.Errorf("BtcEncode #%d wrong error got: %v, want: %v",
				i, err, test.writeErr)
			continue
		}

		// Decode from wire format.
		var msg wire.MsgTx
		r := newFixedReader(test.max, test.buf)
		err = msg.BtcDecode(r, test.pver)
		if err != test.readErr {
			t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
				i, err, test.readErr)
			continue
		}
	}
}

// TestTxWire tests the MsgTx wire encode and decode for various numbers
// of transaction inputs and outputs and protocol versions.
func TestTxWire(t *testing.T) {
	// Empty tx message.
	noTx := wire.NewMsgTx()
	noTx.Version = 1
	noTxEncoded := []byte{
		0x01, 0x00, 0x00, 0x00, // Version
		0x00,                   // Varint for number of input transactions
		0x00,                   // Varint for number of output transactions
		0x00, 0x00, 0x00, 0x00, // Lock time
	}

	tests := []struct {
		in   *wire.MsgTx // Message to encode
		out  *wire.MsgTx // Expected decoded message
		buf  []byte      // Wire encoding
		pver uint32      // Protocol version for wire encoding
	}{
		// Latest protocol version with no transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			wire.ProtocolVersion,
		},

		// Latest protocol version with multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			wire.ProtocolVersion,
		},

		// Protocol version BIP0035Version with no transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			wire.BIP0035Version,
		},

		// Protocol version BIP0035Version with multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			wire.BIP0035Version,
		},

		// Protocol version BIP0031Version with no transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			wire.BIP0031Version,
		},

		// Protocol version BIP0031Version with multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			wire.BIP0031Version,
		},

		// Protocol version NetAddressTimeVersion with no transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			wire.NetAddressTimeVersion,
		},

		// Protocol version NetAddressTimeVersion with multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			wire.NetAddressTimeVersion,
		},

		// Protocol version MultipleAddressVersion with no transactions.
		{
			noTx,
			noTx,
			noTxEncoded,
			wire.MultipleAddressVersion,
		},

		// Protocol version MultipleAddressVersion with multiple transactions.
		{
			multiTx,
			multiTx,
			multiTxEncoded,
			wire.MultipleAddressVersion,
		},
	}

//.........这里部分代码省略.........

// calcSignatureHash will, given a script and hash type for the current script
// engine instance, calculate the signature hash to be used for signing and
// verification.
func calcSignatureHash(script []parsedOpcode, hashType SigHashType, tx *wire.MsgTx, idx int) []byte {
	// The SigHashSingle signature type signs only the corresponding input
	// and output (the output with the same index number as the input).
	//
	// Since transactions can have more inputs than outputs, this means it
	// is improper to use SigHashSingle on input indices that don't have a
	// corresponding output.
	//
	// A bug in the original Satoshi client implementation means specifying
	// an index that is out of range results in a signature hash of 1 (as a
	// uint256 little endian).  The original intent appeared to be to
	// indicate failure, but unfortunately, it was never checked and thus is
	// treated as the actual signature hash.  This buggy behavior is now
	// part of the consensus and a hard fork would be required to fix it.
	//
	// Due to this, care must be taken by software that creates transactions
	// which make use of SigHashSingle because it can lead to an extremely
	// dangerous situation where the invalid inputs will end up signing a
	// hash of 1.  This in turn presents an opportunity for attackers to
	// cleverly construct transactions which can steal those coins provided
	// they can reuse signatures.
	if hashType&sigHashMask == SigHashSingle && idx >= len(tx.TxOut) {
		var hash wire.ShaHash
		hash[0] = 0x01
		return hash[:]
	}

	// Remove all instances of OP_CODESEPARATOR from the script.
	script = removeOpcode(script, OP_CODESEPARATOR)

	// Make a deep copy of the transaction, zeroing out the script for all
	// inputs that are not currently being processed.
	txCopy := tx.Copy()
	for i := range txCopy.TxIn {
		if i == idx {
			// UnparseScript cannot fail here because removeOpcode
			// above only returns a valid script.
			sigScript, _ := unparseScript(script)
			txCopy.TxIn[idx].SignatureScript = sigScript
		} else {
			txCopy.TxIn[i].SignatureScript = nil
		}
	}

	switch hashType & sigHashMask {
	case SigHashNone:
		txCopy.TxOut = txCopy.TxOut[0:0] // Empty slice.
		for i := range txCopy.TxIn {
			if i != idx {
				txCopy.TxIn[i].Sequence = 0
			}
		}

	case SigHashSingle:
		// Resize output array to up to and including requested index.
		txCopy.TxOut = txCopy.TxOut[:idx+1]

		// All but current output get zeroed out.
		for i := 0; i < idx; i++ {
			txCopy.TxOut[i].Value = -1
			txCopy.TxOut[i].PkScript = nil
		}

		// Sequence on all other inputs is 0, too.
		for i := range txCopy.TxIn {
			if i != idx {
				txCopy.TxIn[i].Sequence = 0
			}
		}

	default:
		// Consensus treats undefined hashtypes like normal SigHashAll
		// for purposes of hash generation.
		fallthrough
	case SigHashOld:
		fallthrough
	case SigHashAll:
		// Nothing special here.
	}
	if hashType&SigHashAnyOneCanPay != 0 {
		txCopy.TxIn = txCopy.TxIn[idx : idx+1]
		idx = 0
	}

	// The final hash is the double sha256 of both the serialized modified
	// transaction and the hash type (encoded as a 4-byte little-endian
	// value) appended.
	var wbuf bytes.Buffer
	txCopy.Serialize(&wbuf)
	binary.Write(&wbuf, binary.LittleEndian, uint32(hashType))
	return wire.DoubleSha256(wbuf.Bytes())
}

//.........这里部分代码省略.........

		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 wire.BlockHeader

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

	mblk := wire.NewMsgBlock(&bh)

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

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

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

	mblk.AddTransaction(&tx)

	blk := btcutil.NewBlock(mblk)

	fetchList := []*wire.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 {
					t.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)
	}
}

// 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 int32, rerr error) {
	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
	}
	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 := wire.NewShaHashFromStr("d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599")
			if err != nil {
				panic("invalid sha string in source")
			}
			if txsha.IsEqual(dupsha) {
				// marking TxOut[0] as spent
				po := wire.NewOutPoint(dupsha, 0)
				txI := wire.NewTxIn(po, []byte("garbage"))

				var spendtx wire.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 := wire.NewShaHashFromStr("e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468")
			if err != nil {
				panic("invalid sha string in source")
			}
			if txsha.IsEqual(dupsha) {
				// marking TxOut[0] as spent
				po := wire.NewOutPoint(dupsha, 0)
				txI := wire.NewTxIn(po, []byte("garbage"))

				var spendtx wire.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)
				}
			}
//.........这里部分代码省略.........