// CreateTxChain creates a chain of zero-fee transactions (each subsequent
// transaction spends the entire amount from the previous one) with the first
// one spending the provided outpoint.  Each transaction spends the entire
// amount of the previous one and as such does not include any fees.
func (p *poolHarness) CreateTxChain(firstOutput spendableOutput, numTxns uint32) ([]*btcutil.Tx, error) {
	txChain := make([]*btcutil.Tx, 0, numTxns)
	prevOutPoint := firstOutput.outPoint
	spendableAmount := firstOutput.amount
	for i := uint32(0); i < numTxns; i++ {
		// Create the transaction using the previous transaction output
		// and paying the full amount to the payment address associated
		// with the harness.
		tx := wire.NewMsgTx(wire.TxVersion)
		tx.AddTxIn(&wire.TxIn{
			PreviousOutPoint: prevOutPoint,
			SignatureScript:  nil,
			Sequence:         wire.MaxTxInSequenceNum,
		})
		tx.AddTxOut(&wire.TxOut{
			PkScript: p.payScript,
			Value:    int64(spendableAmount),
		})

		// Sign the new transaction.
		sigScript, err := txscript.SignatureScript(tx, 0, p.payScript,
			txscript.SigHashAll, p.signKey, true)
		if err != nil {
			return nil, err
		}
		tx.TxIn[0].SignatureScript = sigScript

		txChain = append(txChain, btcutil.NewTx(tx))

		// Next transaction uses outputs from this one.
		prevOutPoint = wire.OutPoint{Hash: tx.TxHash(), Index: 0}
	}

	return txChain, nil
}

// makeUtxoView creates a mock unspent transaction output view by using the
// transaction index in order to look up all inputs referenced by the
// transactions in the block.  This is sometimes needed when catching indexes up
// because many of the txouts could actually already be spent however the
// associated scripts are still required to index them.
func makeUtxoView(dbTx database.Tx, block *btcutil.Block) (*blockchain.UtxoViewpoint, error) {
	view := blockchain.NewUtxoViewpoint()
	for txIdx, tx := range block.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 {
			continue
		}

		// Use the transaction index to load all of the referenced
		// inputs and add their outputs to the view.
		for _, txIn := range tx.MsgTx().TxIn {
			originOut := &txIn.PreviousOutPoint
			originTx, err := dbFetchTx(dbTx, &originOut.Hash)
			if err != nil {
				return nil, err
			}

			view.AddTxOuts(btcutil.NewTx(originTx), 0)
		}
	}

	return view, nil
}

// 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(params *chaincfg.Params, coinbaseScript []byte, nextBlockHeight int32, 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 := wire.NewMsgTx(wire.TxVersion)
	tx.AddTxIn(&wire.TxIn{
		// Coinbase transactions have no inputs, so previous outpoint is
		// zero hash and max index.
		PreviousOutPoint: *wire.NewOutPoint(&chainhash.Hash{},
			wire.MaxPrevOutIndex),
		SignatureScript: coinbaseScript,
		Sequence:        wire.MaxTxInSequenceNum,
	})
	tx.AddTxOut(&wire.TxOut{
		Value:    blockchain.CalcBlockSubsidy(nextBlockHeight, params),
		PkScript: pkScript,
	})
	return btcutil.NewTx(tx), nil
}

// TestTx tests the API for Tx.
func TestTx(t *testing.T) {
	testTx := Block100000.Transactions[0]
	tx := btcutil.NewTx(testTx)

	// Ensure we get the same data back out.
	if msgTx := tx.MsgTx(); !reflect.DeepEqual(msgTx, testTx) {
		t.Errorf("MsgTx: mismatched MsgTx - got %v, want %v",
			spew.Sdump(msgTx), spew.Sdump(testTx))
	}

	// Ensure transaction index set and get work properly.
	wantIndex := 0
	tx.SetIndex(0)
	if gotIndex := tx.Index(); gotIndex != wantIndex {
		t.Errorf("Index: mismatched index - got %v, want %v",
			gotIndex, wantIndex)
	}

	// Hash for block 100,000 transaction 0.
	wantShaStr := "8c14f0db3df150123e6f3dbbf30f8b955a8249b62ac1d1ff16284aefa3d06d87"
	wantSha, err := wire.NewShaHashFromStr(wantShaStr)
	if err != nil {
		t.Errorf("NewShaHashFromStr: %v", err)
	}

	// Request the sha multiple times to test generation and caching.
	for i := 0; i < 2; i++ {
		sha := tx.Sha()
		if !sha.IsEqual(wantSha) {
			t.Errorf("Sha #%d mismatched sha - got %v, want %v", i,
				sha, wantSha)
		}
	}
}

// Receive waits for the response promised by the future and returns a
// transaction given its hash.
func (r FutureGetRawTransactionResult) Receive() (*btcutil.Tx, error) {
	res, err := receiveFuture(r)
	if err != nil {
		return nil, err
	}

	// Unmarshal result as a string.
	var txHex string
	err = json.Unmarshal(res, &txHex)
	if err != nil {
		return nil, err
	}

	// Decode the serialized transaction hex to raw bytes.
	serializedTx, err := hex.DecodeString(txHex)
	if err != nil {
		return nil, err
	}

	// Deserialize the transaction and return it.
	var msgTx wire.MsgTx
	if err := msgTx.Deserialize(bytes.NewReader(serializedTx)); err != nil {
		return nil, err
	}
	return btcutil.NewTx(&msgTx), nil
}

// newUtxoViewpoint returns a new utxo view populated with outputs of the
// provided source transactions as if there were available at the respective
// block height specified in the heights slice.  The length of the source txns
// and source tx heights must match or it will panic.
func newUtxoViewpoint(sourceTxns []*wire.MsgTx, sourceTxHeights []int32) *blockchain.UtxoViewpoint {
	if len(sourceTxns) != len(sourceTxHeights) {
		panic("each transaction must have its block height specified")
	}

	view := blockchain.NewUtxoViewpoint()
	for i, tx := range sourceTxns {
		view.AddTxOuts(btcutil.NewTx(tx), sourceTxHeights[i])
	}
	return view
}

// 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[wire.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([]*wire.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.
	var txReplyList []*database.TxListReply
	if includeSpent {
		txReplyList = db.FetchTxByShaList(txList)
	} else {
		txReplyList = db.FetchUnSpentTxByShaList(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
}

// CreateSignedTx creates a new signed transaction that consumes the provided
// inputs and generates the provided number of outputs by evenly splitting the
// total input amount.  All outputs will be to the payment script associated
// with the harness and all inputs are assumed to do the same.
func (p *poolHarness) CreateSignedTx(inputs []spendableOutput, numOutputs uint32) (*btcutil.Tx, error) {
	// Calculate the total input amount and split it amongst the requested
	// number of outputs.
	var totalInput btcutil.Amount
	for _, input := range inputs {
		totalInput += input.amount
	}
	amountPerOutput := int64(totalInput) / int64(numOutputs)
	remainder := int64(totalInput) - amountPerOutput*int64(numOutputs)

	tx := wire.NewMsgTx(wire.TxVersion)
	for _, input := range inputs {
		tx.AddTxIn(&wire.TxIn{
			PreviousOutPoint: input.outPoint,
			SignatureScript:  nil,
			Sequence:         wire.MaxTxInSequenceNum,
		})
	}
	for i := uint32(0); i < numOutputs; i++ {
		// Ensure the final output accounts for any remainder that might
		// be left from splitting the input amount.
		amount := amountPerOutput
		if i == numOutputs-1 {
			amount = amountPerOutput + remainder
		}
		tx.AddTxOut(&wire.TxOut{
			PkScript: p.payScript,
			Value:    amount,
		})
	}

	// Sign the new transaction.
	for i := range tx.TxIn {
		sigScript, err := txscript.SignatureScript(tx, i, p.payScript,
			txscript.SigHashAll, p.signKey, true)
		if err != nil {
			return nil, err
		}
		tx.TxIn[i].SignatureScript = sigScript
	}

	return btcutil.NewTx(tx), nil
}

// parseChainTxNtfnParams parses out the transaction and optional details about
// the block it's mined in from the parameters of recvtx and redeemingtx
// notifications.
func parseChainTxNtfnParams(params []json.RawMessage) (*btcutil.Tx,
	*btcjson.BlockDetails, error) {

	if len(params) == 0 || len(params) > 2 {
		return nil, nil, wrongNumParams(len(params))
	}

	// Unmarshal first parameter as a string.
	var txHex string
	err := json.Unmarshal(params[0], &txHex)
	if err != nil {
		return nil, nil, err
	}

	// If present, unmarshal second optional parameter as the block details
	// JSON object.
	var block *btcjson.BlockDetails
	if len(params) > 1 {
		err = json.Unmarshal(params[1], &block)
		if err != nil {
			return nil, nil, err
		}
	}

	// Hex decode and deserialize the transaction.
	serializedTx, err := hex.DecodeString(txHex)
	if err != nil {
		return nil, nil, err
	}
	var msgTx wire.MsgTx
	err = msgTx.Deserialize(bytes.NewReader(serializedTx))
	if err != nil {
		return nil, nil, err
	}

	// TODO: Change recvtx and redeemingtx callback signatures to use
	// nicer types for details about the block (block sha as a
	// wire.ShaHash, block time as a time.Time, etc.).
	return btcutil.NewTx(&msgTx), block, nil
}

// createCoinbaseTx returns a coinbase transaction paying an appropriate
// subsidy based on the passed block height to the provided address.
func createCoinbaseTx(coinbaseScript []byte, nextBlockHeight int32,
	addr btcutil.Address, net *chaincfg.Params) (*btcutil.Tx, error) {

	// Create the script to pay to the provided payment address.
	pkScript, err := txscript.PayToAddrScript(addr)
	if err != nil {
		return nil, err
	}

	tx := wire.NewMsgTx()
	tx.AddTxIn(&wire.TxIn{
		// Coinbase transactions have no inputs, so previous outpoint is
		// zero hash and max index.
		PreviousOutPoint: *wire.NewOutPoint(&chainhash.Hash{},
			wire.MaxPrevOutIndex),
		SignatureScript: coinbaseScript,
		Sequence:        wire.MaxTxInSequenceNum,
	})
	tx.AddTxOut(&wire.TxOut{
		Value:    blockchain.CalcBlockSubsidy(nextBlockHeight, net),
		PkScript: pkScript,
	})
	return btcutil.NewTx(tx), nil
}

// CreateCoinbaseTx returns a coinbase transaction with the requested number of
// outputs paying an appropriate subsidy based on the passed block height to the
// address associated with the harness.  It automatically uses a standard
// signature script that starts with the block height that is required by
// version 2 blocks.
func (p *poolHarness) CreateCoinbaseTx(blockHeight int32, numOutputs uint32) (*btcutil.Tx, error) {
	// Create standard coinbase script.
	extraNonce := int64(0)
	coinbaseScript, err := txscript.NewScriptBuilder().
		AddInt64(int64(blockHeight)).AddInt64(extraNonce).Script()
	if err != nil {
		return nil, err
	}

	tx := wire.NewMsgTx(wire.TxVersion)
	tx.AddTxIn(&wire.TxIn{
		// Coinbase transactions have no inputs, so previous outpoint is
		// zero hash and max index.
		PreviousOutPoint: *wire.NewOutPoint(&chainhash.Hash{},
			wire.MaxPrevOutIndex),
		SignatureScript: coinbaseScript,
		Sequence:        wire.MaxTxInSequenceNum,
	})
	totalInput := blockchain.CalcBlockSubsidy(blockHeight, p.chainParams)
	amountPerOutput := totalInput / int64(numOutputs)
	remainder := totalInput - amountPerOutput*int64(numOutputs)
	for i := uint32(0); i < numOutputs; i++ {
		// Ensure the final output accounts for any remainder that might
		// be left from splitting the input amount.
		amount := amountPerOutput
		if i == numOutputs-1 {
			amount = amountPerOutput + remainder
		}
		tx.AddTxOut(&wire.TxOut{
			PkScript: p.payScript,
			Value:    amount,
		})
	}

	return btcutil.NewTx(tx), nil
}

// TestCalcSequenceLock tests the LockTimeToSequence function, and the
// CalcSequenceLock method of a Chain instance. The tests exercise several
// combinations of inputs to the CalcSequenceLock function in order to ensure
// the returned SequenceLocks are correct for each test instance.
func TestCalcSequenceLock(t *testing.T) {
	fileName := "blk_0_to_4.dat.bz2"
	blocks, err := loadBlocks(fileName)
	if err != nil {
		t.Errorf("Error loading file: %v\n", err)
		return
	}

	// Create a new database and chain instance to run tests against.
	chain, teardownFunc, err := chainSetup("haveblock", &chaincfg.MainNetParams)
	if err != nil {
		t.Errorf("Failed to setup chain instance: %v", err)
		return
	}
	defer teardownFunc()

	// Since we're not dealing with the real block chain, disable
	// checkpoints and set the coinbase maturity to 1.
	chain.DisableCheckpoints(true)
	chain.TstSetCoinbaseMaturity(1)

	// Load all the blocks into our test chain.
	for i := 1; i < len(blocks); i++ {
		_, isOrphan, err := chain.ProcessBlock(blocks[i], blockchain.BFNone)
		if err != nil {
			t.Errorf("ProcessBlock fail on block %v: %v\n", i, err)
			return
		}
		if isOrphan {
			t.Errorf("ProcessBlock incorrectly returned block %v "+
				"is an orphan\n", i)
			return
		}
	}

	// Create with all the utxos within the create created above.
	utxoView := blockchain.NewUtxoViewpoint()
	for blockHeight, block := range blocks {
		for _, tx := range block.Transactions() {
			utxoView.AddTxOuts(tx, int32(blockHeight))
		}
	}
	utxoView.SetBestHash(blocks[len(blocks)-1].Hash())

	// The median past time from the point of view of the second to last
	// block in the chain.
	medianTime := blocks[2].MsgBlock().Header.Timestamp.Unix()

	// The median past time of the *next* block will be the timestamp of
	// the 2nd block due to the way MTP is calculated in order to be
	// compatible with Bitcoin Core.
	nextMedianTime := blocks[2].MsgBlock().Header.Timestamp.Unix()

	// We'll refer to this utxo within each input in the transactions
	// created below. This block that includes this UTXO has a height of 4.
	targetTx := blocks[4].Transactions()[0]
	utxo := wire.OutPoint{
		Hash:  *targetTx.Hash(),
		Index: 0,
	}

	// Add an additional transaction which will serve as our unconfirmed
	// output.
	var fakeScript []byte
	unConfTx := &wire.MsgTx{
		TxOut: []*wire.TxOut{{
			PkScript: fakeScript,
			Value:    5,
		}},
	}
	unConfUtxo := wire.OutPoint{
		Hash:  unConfTx.TxHash(),
		Index: 0,
	}
	// Adding a utxo with a height of 0x7fffffff indicates that the output
	// is currently unmined.
	utxoView.AddTxOuts(btcutil.NewTx(unConfTx), 0x7fffffff)

	tests := []struct {
		tx      *btcutil.Tx
		view    *blockchain.UtxoViewpoint
		want    *blockchain.SequenceLock
		mempool bool
	}{
		// A transaction of version one should disable sequence locks
		// as the new sequence number semantics only apply to
		// transactions version 2 or higher.
		{
			tx: btcutil.NewTx(&wire.MsgTx{
				Version: 1,
				TxIn: []*wire.TxIn{{
					PreviousOutPoint: utxo,
					Sequence:         blockchain.LockTimeToSequence(false, 3),
				}},
			}),
			view: utxoView,
//.........这里部分代码省略.........

func TestInsertsCreditsDebitsRollbacks(t *testing.T) {
	t.Parallel()

	// Create a double spend of the received blockchain transaction.
	dupRecvTx, _ := btcutil.NewTxFromBytes(TstRecvSerializedTx)
	// Switch txout amount to 1 BTC.  Transaction store doesn't
	// validate txs, so this is fine for testing a double spend
	// removal.
	TstDupRecvAmount := int64(1e8)
	newDupMsgTx := dupRecvTx.MsgTx()
	newDupMsgTx.TxOut[0].Value = TstDupRecvAmount
	TstDoubleSpendTx := btcutil.NewTx(newDupMsgTx)
	TstDoubleSpendSerializedTx := serializeTx(TstDoubleSpendTx)

	// Create a "signed" (with invalid sigs) tx that spends output 0 of
	// the double spend.
	spendingTx := wire.NewMsgTx()
	spendingTxIn := wire.NewTxIn(wire.NewOutPoint(TstDoubleSpendTx.Hash(), 0), []byte{0, 1, 2, 3, 4})
	spendingTx.AddTxIn(spendingTxIn)
	spendingTxOut1 := wire.NewTxOut(1e7, []byte{5, 6, 7, 8, 9})
	spendingTxOut2 := wire.NewTxOut(9e7, []byte{10, 11, 12, 13, 14})
	spendingTx.AddTxOut(spendingTxOut1)
	spendingTx.AddTxOut(spendingTxOut2)
	TstSpendingTx := btcutil.NewTx(spendingTx)
	TstSpendingSerializedTx := serializeTx(TstSpendingTx)
	var _ = TstSpendingTx

	tests := []struct {
		name     string
		f        func(*Store) (*Store, error)
		bal, unc btcutil.Amount
		unspents map[wire.OutPoint]struct{}
		unmined  map[chainhash.Hash]struct{}
	}{
		{
			name: "new store",
			f: func(s *Store) (*Store, error) {
				return s, nil
			},
			bal:      0,
			unc:      0,
			unspents: map[wire.OutPoint]struct{}{},
			unmined:  map[chainhash.Hash]struct{}{},
		},
		{
			name: "txout insert",
			f: func(s *Store) (*Store, error) {
				rec, err := NewTxRecord(TstRecvSerializedTx, time.Now())
				if err != nil {
					return nil, err
				}
				err = s.InsertTx(rec, nil)
				if err != nil {
					return nil, err
				}

				err = s.AddCredit(rec, nil, 0, false)
				return s, err
			},
			bal: 0,
			unc: btcutil.Amount(TstRecvTx.MsgTx().TxOut[0].Value),
			unspents: map[wire.OutPoint]struct{}{
				wire.OutPoint{
					Hash:  *TstRecvTx.Hash(),
					Index: 0,
				}: {},
			},
			unmined: map[chainhash.Hash]struct{}{
				*TstRecvTx.Hash(): {},
			},
		},
		{
			name: "insert duplicate unconfirmed",
			f: func(s *Store) (*Store, error) {
				rec, err := NewTxRecord(TstRecvSerializedTx, time.Now())
				if err != nil {
					return nil, err
				}
				err = s.InsertTx(rec, nil)
				if err != nil {
					return nil, err
				}

				err = s.AddCredit(rec, nil, 0, false)
				return s, err
			},
			bal: 0,
			unc: btcutil.Amount(TstRecvTx.MsgTx().TxOut[0].Value),
			unspents: map[wire.OutPoint]struct{}{
				wire.OutPoint{
					Hash:  *TstRecvTx.Hash(),
					Index: 0,
				}: {},
			},
			unmined: map[chainhash.Hash]struct{}{
				*TstRecvTx.Hash(): {},
			},
		},
		{
			name: "confirmed txout insert",
//.........这里部分代码省略.........

// 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 := wire.NewOutPoint(&chainhash.Hash{}, math.MaxUint32)
	coinbaseTx := wire.NewMsgTx(1)
	coinbaseTx.AddTxIn(wire.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 int32  // 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
			}
		}
	}
}

// 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 > wire.MaxBlockPayload {
			return nil, fmt.Errorf("Read serialized transaction "+
				"length of %d is larger max allowed %d",
				serializedTxLen, wire.MaxBlockPayload)
		}

		// Transaction.
		var msgTx wire.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
//.........这里部分代码省略.........

func testGenerateAndSubmitBlock(r *Harness, t *testing.T) {
	// Generate a few test spend transactions.
	addr, err := r.NewAddress()
	if err != nil {
		t.Fatalf("unable to generate new address: %v", err)
	}
	pkScript, err := txscript.PayToAddrScript(addr)
	if err != nil {
		t.Fatalf("unable to create script: %v", err)
	}
	output := wire.NewTxOut(btcutil.SatoshiPerBitcoin, pkScript)

	const numTxns = 5
	txns := make([]*btcutil.Tx, 0, numTxns)
	for i := 0; i < numTxns; i++ {
		tx, err := r.CreateTransaction([]*wire.TxOut{output}, 10)
		if err != nil {
			t.Fatalf("unable to create tx: %v", err)
		}

		txns = append(txns, btcutil.NewTx(tx))
	}

	// Now generate a block with the default block version, and a zero'd
	// out time.
	block, err := r.GenerateAndSubmitBlock(txns, -1, time.Time{})
	if err != nil {
		t.Fatalf("unable to generate block: %v", err)
	}

	// Ensure that all created transactions were included, and that the
	// block version was properly set to the default.
	numBlocksTxns := len(block.Transactions())
	if numBlocksTxns != numTxns+1 {
		t.Fatalf("block did not include all transactions: "+
			"expected %v, got %v", numTxns+1, numBlocksTxns)
	}
	blockVersion := block.MsgBlock().Header.Version
	if blockVersion != wire.BlockVersion {
		t.Fatalf("block version is not default: expected %v, got %v",
			wire.BlockVersion, blockVersion)
	}

	// Next generate a block with a "non-standard" block version along with
	// time stamp a minute after the previous block's timestamp.
	timestamp := block.MsgBlock().Header.Timestamp.Add(time.Minute)
	targetBlockVersion := int32(1337)
	block, err = r.GenerateAndSubmitBlock(nil, targetBlockVersion, timestamp)
	if err != nil {
		t.Fatalf("unable to generate block: %v", err)
	}

	// Finally ensure that the desired block version and timestamp were set
	// properly.
	header := block.MsgBlock().Header
	blockVersion = header.Version
	if blockVersion != targetBlockVersion {
		t.Fatalf("block version mismatch: expected %v, got %v",
			targetBlockVersion, blockVersion)
	}
	if !timestamp.Equal(header.Timestamp) {
		t.Fatalf("header time stamp mismatch: expected %v, got %v",
			timestamp, header.Timestamp)
	}
}

// Ingest puts a tx into the DB atomically.  This can result in a
// gain, a loss, or no result.  Gain or loss in satoshis is returned.
func (ts *TxStore) Ingest(tx *wire.MsgTx, height int32) (uint32, error) {
	var hits uint32
	var err error
	var spentOPs [][]byte
	var nUtxoBytes [][]byte

	// tx has been OK'd by SPV; check tx sanity
	utilTx := btcutil.NewTx(tx) // convert for validation
	// checks basic stuff like there are inputs and ouputs
	err = blockchain.CheckTransactionSanity(utilTx)
	if err != nil {
		return hits, err
	}
	// note that you can't check signatures; this is SPV.
	// 0 conf SPV means pretty much nothing.  Anyone can say anything.

	// before entering into db, serialize all inputs of the ingested tx
	for _, txin := range tx.TxIn {
		nOP, err := outPointToBytes(&txin.PreviousOutPoint)
		if err != nil {
			return hits, err
		}
		spentOPs = append(spentOPs, nOP)
	}
	// also generate PKscripts for all addresses (maybe keep storing these?)
	for _, adr := range ts.Adrs {
		// iterate through all our addresses
		aPKscript, err := txscript.PayToAddrScript(adr.PkhAdr)
		if err != nil {
			return hits, err
		}
		// iterate through all outputs of this tx
		for i, out := range tx.TxOut {
			if bytes.Equal(out.PkScript, aPKscript) { // new utxo for us
				var newu Utxo
				newu.AtHeight = height
				newu.KeyIdx = adr.KeyIdx
				newu.Value = out.Value
				var newop wire.OutPoint
				newop.Hash = tx.TxSha()
				newop.Index = uint32(i)
				newu.Op = newop
				b, err := newu.ToBytes()
				if err != nil {
					return hits, err
				}
				nUtxoBytes = append(nUtxoBytes, b)
				hits++
				break // only one match
			}
		}
	}

	err = ts.StateDB.Update(func(btx *bolt.Tx) error {
		// get all 4 buckets
		duf := btx.Bucket(BKTUtxos)
		//		sta := btx.Bucket(BKTState)
		old := btx.Bucket(BKTStxos)
		txns := btx.Bucket(BKTTxns)
		if duf == nil || old == nil || txns == nil {
			return fmt.Errorf("error: db not initialized")
		}

		// first see if we lose utxos
		// iterate through duffel bag and look for matches
		// this makes us lose money, which is regrettable, but we need to know.
		for _, nOP := range spentOPs {
			duf.ForEach(func(k, v []byte) error {
				if bytes.Equal(k, nOP) { // matched, we lost utxo
					// do all this just to figure out value we lost
					x := make([]byte, len(k)+len(v))
					copy(x, k)
					copy(x[len(k):], v)
					lostTxo, err := UtxoFromBytes(x)
					if err != nil {
						return err
					}
					hits++
					// then delete the utxo from duf, save to old
					err = duf.Delete(k)
					if err != nil {
						return err
					}
					// after deletion, save stxo to old bucket
					var st Stxo               // generate spent txo
					st.Utxo = lostTxo         // assign outpoint
					st.SpendHeight = height   // spent at height
					st.SpendTxid = tx.TxSha() // spent by txid
					stxb, err := st.ToBytes() // serialize
					if err != nil {
						return err
					}
					err = old.Put(k, stxb) // write k:v outpoint:stxo bytes
					if err != nil {
						return err
					}
					// store this relevant tx
					sha := tx.TxSha()
//.........这里部分代码省略.........

//.........这里部分代码省略.........
				}},
				LockTime: 0,
			},
			height:     300000,
			isStandard: false,
			code:       wire.RejectNonstandard,
		},
		{
			name: "More than one nulldata output",
			tx: wire.MsgTx{
				Version: 1,
				TxIn:    []*wire.TxIn{&dummyTxIn},
				TxOut: []*wire.TxOut{{
					Value:    0,
					PkScript: []byte{txscript.OP_RETURN},
				}, {
					Value:    0,
					PkScript: []byte{txscript.OP_RETURN},
				}},
				LockTime: 0,
			},
			height:     300000,
			isStandard: false,
			code:       wire.RejectNonstandard,
		},
		{
			name: "Dust output",
			tx: wire.MsgTx{
				Version: 1,
				TxIn:    []*wire.TxIn{&dummyTxIn},
				TxOut: []*wire.TxOut{{
					Value:    0,
					PkScript: dummyPkScript,
				}},
				LockTime: 0,
			},
			height:     300000,
			isStandard: false,
			code:       wire.RejectDust,
		},
		{
			name: "One nulldata output with 0 amount (standard)",
			tx: wire.MsgTx{
				Version: 1,
				TxIn:    []*wire.TxIn{&dummyTxIn},
				TxOut: []*wire.TxOut{{
					Value:    0,
					PkScript: []byte{txscript.OP_RETURN},
				}},
				LockTime: 0,
			},
			height:     300000,
			isStandard: true,
		},
	}

	timeSource := blockchain.NewMedianTime()
	for _, test := range tests {
		// Ensure standardness is as expected.
		err := checkTransactionStandard(btcutil.NewTx(&test.tx),
			test.height, timeSource, defaultMinRelayTxFee)
		if err == nil && test.isStandard {
			// Test passes since function returned standard for a
			// transaction which is intended to be standard.
			continue
		}
		if err == nil && !test.isStandard {
			t.Errorf("checkTransactionStandard (%s): standard when "+
				"it should not be", test.name)
			continue
		}
		if err != nil && test.isStandard {
			t.Errorf("checkTransactionStandard (%s): nonstandard "+
				"when it should not be: %v", test.name, err)
			continue
		}

		// Ensure error type is a TxRuleError inside of a RuleError.
		rerr, ok := err.(RuleError)
		if !ok {
			t.Errorf("checkTransactionStandard (%s): unexpected "+
				"error type - got %T", test.name, err)
			continue
		}
		txrerr, ok := rerr.Err.(TxRuleError)
		if !ok {
			t.Errorf("checkTransactionStandard (%s): unexpected "+
				"error type - got %T", test.name, rerr.Err)
			continue
		}

		// Ensure the reject code is the expected one.
		if txrerr.RejectCode != test.code {
			t.Errorf("checkTransactionStandard (%s): unexpected "+
				"error code - got %v, want %v", test.name,
				txrerr.RejectCode, test.code)
			continue
		}
	}
}