Golang dcrutil.DecodeAddress函數代碼示例

// This example demonstrates creating a script which pays to a decred address.
// It also prints the created script hex and uses the DisasmString function to
// display the disassembled script.
func ExamplePayToAddrScript() {
	// Parse the address to send the coins to into a dcrutil.Address
	// which is useful to ensure the accuracy of the address and determine
	// the address type.  It is also required for the upcoming call to
	// PayToAddrScript.
	addressStr := "DsSej1qR3Fyc8kV176DCh9n9cY9nqf9Quxk"
	address, err := dcrutil.DecodeAddress(addressStr, &chaincfg.MainNetParams)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Create a public key script that pays to the address.
	script, err := txscript.PayToAddrScript(address)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Printf("Script Hex: %x\n", script)

	disasm, err := txscript.DisasmString(script)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println("Script Disassembly:", disasm)

	// Output:
	// Script Hex: 76a914128004ff2fcaf13b2b91eb654b1dc2b674f7ec6188ac
	// Script Disassembly: OP_DUP OP_HASH160 128004ff2fcaf13b2b91eb654b1dc2b674f7ec61 OP_EQUALVERIFY OP_CHECKSIG
}

// GetNewAddress must be run as many times as necessary with the address pool
// mutex locked. Each time, it returns a single new address while adding that
// address to the toDelete map. If the address pool runs out of addresses, it
// generates more from the address manager.
//
// This function MUST be called with the address pool mutex held and batch
// finish or rollback must be called after.
func (a *addressPool) getNewAddress(waddrmgrNs walletdb.ReadWriteBucket) (dcrutil.Address, error) {
	if !a.started {
		return nil, fmt.Errorf("failed to getNewAddress; pool not started")
	}

	chainClient, err := a.wallet.requireChainClient()
	if err != nil {
		return nil, err
	}

	// Replenish the pool if we're at the last address.
	if a.cursor == len(a.addresses)-1 || len(a.addresses) == 0 {
		var nextAddrFunc func(walletdb.ReadWriteBucket, uint32, uint32) ([]waddrmgr.ManagedAddress, error)
		switch a.branch {
		case waddrmgr.InternalBranch:
			nextAddrFunc = a.wallet.Manager.NextInternalAddresses
		case waddrmgr.ExternalBranch:
			nextAddrFunc = a.wallet.Manager.NextExternalAddresses
		default:
			return nil, fmt.Errorf("unknown default account branch %v", a.branch)
		}

		addrs, err := nextAddrFunc(waddrmgrNs, a.account, addressPoolBuffer)
		if err != nil {
			return nil, err
		}
		for _, addr := range addrs {
			a.addresses = append(a.addresses, addr.Address().EncodeAddress())
		}
	}

	// As these are all encoded addresses, we should never throw an error
	// converting back.
	curAddressStr := a.addresses[a.cursor]
	curAddress, err := dcrutil.DecodeAddress(curAddressStr, a.wallet.chainParams)
	if err != nil {
		return nil, fmt.Errorf("unexpected error decoding address %s: %s",
			curAddressStr, err.Error())
	}

	log.Debugf("Get new address for branch %v returned %s (idx %v) from "+
		"the address pool", a.branch, curAddressStr, a.index)

	// Add the address to the notifications watcher.
	addrs := []dcrutil.Address{curAddress}
	err = chainClient.LoadTxFilter(false, addrs, nil)
	if err != nil {
		return nil, err
	}

	a.cursor++
	a.index++

	return curAddress, nil
}

func TestSignMultiSigUTXOPkScriptNotP2SH(t *testing.T) {
	tearDown, pool, _ := TstCreatePoolAndTxStore(t)
	defer tearDown()

	mgr := pool.Manager()
	tx := createWithdrawalTx(t, pool, []int64{4e6}, []int64{})
	addr, _ := dcrutil.DecodeAddress("1MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", mgr.ChainParams())
	pubKeyHashPkScript, _ := txscript.PayToAddrScript(addr.(*dcrutil.AddressPubKeyHash))
	msgtx := tx.toMsgTx()

	err := signMultiSigUTXO(mgr, msgtx, 0, pubKeyHashPkScript, []RawSig{RawSig{}})

	TstCheckError(t, "", err, ErrTxSigning)
}

// GetNewAddress must be run as many times as necessary with the address pool
// mutex locked. Each time, it returns a single new address while adding that
// address to the toDelete map. If the address pool runs out of addresses, it
// generates more from the address manager.
func (a *addressPool) GetNewAddress() (dcrutil.Address, error) {
	// Replenish the pool if we're at the last address.
	if a.cursor == len(a.addresses)-1 || len(a.addresses) == 0 {
		if a.branch == waddrmgr.InternalBranch {
			addrs, err :=
				a.wallet.Manager.NextInternalAddresses(
					waddrmgr.DefaultAccountNum, addressPoolBuffer)
			if err != nil {
				return nil, err
			}

			for _, addr := range addrs {
				a.addresses = append(a.addresses, addr.Address().EncodeAddress())
			}
		}

		if a.branch == waddrmgr.ExternalBranch {
			addrs, err :=
				a.wallet.Manager.NextExternalAddresses(
					waddrmgr.DefaultAccountNum, addressPoolBuffer)
			if err != nil {
				return nil, err
			}

			for _, addr := range addrs {
				a.addresses = append(a.addresses, addr.Address().EncodeAddress())
			}
		}
	}

	// As these are all encoded addresses, we should never throw an error
	// converting back.
	curAddressStr := a.addresses[a.cursor]
	curAddress, _ := dcrutil.DecodeAddress(curAddressStr, a.wallet.chainParams)
	a.cursor++

	// Add the address to the notifications watcher.
	addrs := make([]dcrutil.Address, 1)
	addrs[0] = curAddress
	if err := a.wallet.chainSvr.NotifyReceived(addrs); err != nil {
		return nil, err
	}

	return curAddress, nil
}

func TstNewOutputRequest(t *testing.T, transaction uint32, address string, amount dcrutil.Amount,
	net *chaincfg.Params) OutputRequest {
	addr, err := dcrutil.DecodeAddress(address, net)
	if err != nil {
		t.Fatalf("Unable to decode address %s", address)
	}
	pkScript, err := txscript.PayToAddrScript(addr)
	if err != nil {
		t.Fatalf("Unable to generate pkScript for %v", addr)
	}
	return OutputRequest{
		PkScript:    pkScript,
		Address:     addr,
		Amount:      amount,
		Server:      "server",
		Transaction: transaction,
	}
}

func TestSignMultiSigUTXORedeemScriptNotFound(t *testing.T) {
	tearDown, pool, _ := TstCreatePoolAndTxStore(t)
	defer tearDown()

	mgr := pool.Manager()
	tx := createWithdrawalTx(t, pool, []int64{4e6}, []int64{})
	// This is a P2SH address for which the addr manager doesn't have the redeem
	// script.
	addr, _ := dcrutil.DecodeAddress("3Hb4xcebcKg4DiETJfwjh8sF4uDw9rqtVC", mgr.ChainParams())
	if _, err := mgr.Address(addr); err == nil {
		t.Fatalf("Address %s found in manager when it shouldn't", addr)
	}
	msgtx := tx.toMsgTx()

	pkScript, _ := txscript.PayToAddrScript(addr.(*dcrutil.AddressScriptHash))
	err := signMultiSigUTXO(mgr, msgtx, 0, pkScript, []RawSig{RawSig{}})

	TstCheckError(t, "", err, ErrTxSigning)
}

// checkOutputsMatch checks that the outputs in the tx match the expected ones.
func checkOutputsMatch(t *testing.T, msgtx *wire.MsgTx, expected map[string]dcrutil.Amount) {
	// This is a bit convoluted because the index of the change output is randomized.
	for addrStr, v := range expected {
		addr, err := dcrutil.DecodeAddress(addrStr, &chaincfg.TestNetParams)
		if err != nil {
			t.Fatalf("Cannot decode address: %v", err)
		}
		pkScript, err := txscript.PayToAddrScript(addr)
		if err != nil {
			t.Fatalf("Cannot create pkScript: %v", err)
		}
		found := false
		for _, txout := range msgtx.TxOut {
			if reflect.DeepEqual(txout.PkScript, pkScript) && txout.Value == int64(v) {
				found = true
				break
			}
		}
		if !found {
			t.Fatalf("PkScript %v not found in msgtx.TxOut: %v", pkScript, msgtx.TxOut)
		}
	}
}

// CoinbasePaysTax checks to see if a given block's coinbase correctly pays
// tax to the developer organization.
func CoinbasePaysTax(tx *dcrutil.Tx, height uint32, voters uint16,
	params *chaincfg.Params) error {
	// Taxes only apply from block 2 onwards.
	if height <= 1 {
		return nil
	}

	// Tax is disabled.
	if params.BlockTaxProportion == 0 {
		return nil
	}

	if len(tx.MsgTx().TxOut) == 0 {
		errStr := fmt.Sprintf("invalid coinbase (no outputs)")
		return ruleError(ErrNoTxOutputs, errStr)
	}

	// Coinbase output 0 must be the subsidy to the dev organization.
	taxPkVersion := tx.MsgTx().TxOut[0].Version
	taxPkScript := tx.MsgTx().TxOut[0].PkScript
	class, addrs, _, err :=
		txscript.ExtractPkScriptAddrs(taxPkVersion, taxPkScript, params)
	// The script can't be a weird class.
	if !(class == txscript.ScriptHashTy ||
		class == txscript.PubKeyHashTy ||
		class == txscript.PubKeyTy) {
		errStr := fmt.Sprintf("wrong script class for tax output")
		return ruleError(ErrNoTax, errStr)
	}

	// There should only be one address.
	if len(addrs) != 1 {
		errStr := fmt.Sprintf("no or too many addresses in output")
		return ruleError(ErrNoTax, errStr)
	}

	// Decode the organization address.
	addrOrg, err := dcrutil.DecodeAddress(params.OrganizationAddress, params)
	if err != nil {
		return err
	}

	if !bytes.Equal(addrs[0].ScriptAddress(), addrOrg.ScriptAddress()) {
		errStr := fmt.Sprintf("address in output 0 has non matching org "+
			"address; got %v (hash160 %x), want %v (hash160 %x)",
			addrs[0].EncodeAddress(),
			addrs[0].ScriptAddress(),
			addrOrg.EncodeAddress(),
			addrOrg.ScriptAddress())
		return ruleError(ErrNoTax, errStr)
	}

	// Get the amount of subsidy that should have been paid out to
	// the organization, then check it.
	orgSubsidy := CalcBlockTaxSubsidy(int64(height), voters, params)
	amountFound := tx.MsgTx().TxOut[0].Value
	if orgSubsidy != amountFound {
		errStr := fmt.Sprintf("amount in output 0 has non matching org "+
			"calculated amount; got %v, want %v", amountFound, orgSubsidy)
		return ruleError(ErrNoTax, errStr)
	}

	return nil
}

// BlockOneCoinbasePaysTokens checks to see if the first block coinbase pays
// out to the network initial token ledger.
func BlockOneCoinbasePaysTokens(tx *dcrutil.Tx, params *chaincfg.Params) error {
	// If no ledger is specified, just return true.
	if len(params.BlockOneLedger) == 0 {
		return nil
	}

	if tx.MsgTx().LockTime != 0 {
		errStr := fmt.Sprintf("block 1 coinbase has invalid locktime")
		return ruleError(ErrBlockOneTx, errStr)
	}

	if tx.MsgTx().Expiry != wire.NoExpiryValue {
		errStr := fmt.Sprintf("block 1 coinbase has invalid expiry")
		return ruleError(ErrBlockOneTx, errStr)
	}

	if tx.MsgTx().TxIn[0].Sequence != wire.MaxTxInSequenceNum {
		errStr := fmt.Sprintf("block 1 coinbase not finalized")
		return ruleError(ErrBlockOneInputs, errStr)
	}

	if len(tx.MsgTx().TxOut) == 0 {
		errStr := fmt.Sprintf("coinbase outputs empty in block 1")
		return ruleError(ErrBlockOneOutputs, errStr)
	}

	ledger := params.BlockOneLedger
	if len(ledger) != len(tx.MsgTx().TxOut) {
		errStr := fmt.Sprintf("wrong number of outputs in block 1 coinbase; "+
			"got %v, expected %v", len(tx.MsgTx().TxOut), len(ledger))
		return ruleError(ErrBlockOneOutputs, errStr)
	}

	// Check the addresses and output amounts against those in the ledger.
	for i, txout := range tx.MsgTx().TxOut {
		if txout.Version != txscript.DefaultScriptVersion {
			errStr := fmt.Sprintf("bad block one output version; want %v, got %v",
				txscript.DefaultScriptVersion, txout.Version)
			return ruleError(ErrBlockOneOutputs, errStr)
		}

		// There should only be one address.
		_, addrs, _, err :=
			txscript.ExtractPkScriptAddrs(txout.Version, txout.PkScript, params)
		if len(addrs) != 1 {
			errStr := fmt.Sprintf("too many addresses in output")
			return ruleError(ErrBlockOneOutputs, errStr)
		}

		addrLedger, err := dcrutil.DecodeAddress(ledger[i].Address, params)
		if err != nil {
			return err
		}

		if !bytes.Equal(addrs[0].ScriptAddress(), addrLedger.ScriptAddress()) {
			errStr := fmt.Sprintf("address in output %v has non matching "+
				"address; got %v (hash160 %x), want %v (hash160 %x)",
				i,
				addrs[0].EncodeAddress(),
				addrs[0].ScriptAddress(),
				addrLedger.EncodeAddress(),
				addrLedger.ScriptAddress())
			return ruleError(ErrBlockOneOutputs, errStr)
		}

		if txout.Value != ledger[i].Amount {
			errStr := fmt.Sprintf("address in output %v has non matching "+
				"amount; got %v, want %v", i, txout.Value, ledger[i].Amount)
			return ruleError(ErrBlockOneOutputs, errStr)
		}
	}

	return nil
}

//.........這裏部分代碼省略.........
		{
			name: "testnet p2pk hybrid (0x07)",
			addr: "07b0bd634234abbb1ba1e986e884185c61cf43e001f9137f23c2c409273eb16e6" +
				"537a576782eba668a7ef8bd3b3cfb1edb7117ab65129b8a2e681f3c1e0908ef7b",
			encoded: "muUnepk5nPPrxUTuTAhRqrpAQuSWS5fVii",
			valid:   true,
			result: dcrutil.TstAddressPubKey(
				[]byte{
					0x07, 0xb0, 0xbd, 0x63, 0x42, 0x34, 0xab, 0xbb, 0x1b, 0xa1,
					0xe9, 0x86, 0xe8, 0x84, 0x18, 0x5c, 0x61, 0xcf, 0x43, 0xe0,
					0x01, 0xf9, 0x13, 0x7f, 0x23, 0xc2, 0xc4, 0x09, 0x27, 0x3e,
					0xb1, 0x6e, 0x65, 0x37, 0xa5, 0x76, 0x78, 0x2e, 0xba, 0x66,
					0x8a, 0x7e, 0xf8, 0xbd, 0x3b, 0x3c, 0xfb, 0x1e, 0xdb, 0x71,
					0x17, 0xab, 0x65, 0x12, 0x9b, 0x8a, 0x2e, 0x68, 0x1f, 0x3c,
					0x1e, 0x09, 0x08, 0xef, 0x7b},
				dcrutil.PKFHybrid, chaincfg.TestNetParams.PubKeyHashAddrID),
			f: func() (dcrutil.Address, error) {
				serializedPubKey := []byte{
					0x07, 0xb0, 0xbd, 0x63, 0x42, 0x34, 0xab, 0xbb, 0x1b, 0xa1,
					0xe9, 0x86, 0xe8, 0x84, 0x18, 0x5c, 0x61, 0xcf, 0x43, 0xe0,
					0x01, 0xf9, 0x13, 0x7f, 0x23, 0xc2, 0xc4, 0x09, 0x27, 0x3e,
					0xb1, 0x6e, 0x65, 0x37, 0xa5, 0x76, 0x78, 0x2e, 0xba, 0x66,
					0x8a, 0x7e, 0xf8, 0xbd, 0x3b, 0x3c, 0xfb, 0x1e, 0xdb, 0x71,
					0x17, 0xab, 0x65, 0x12, 0x9b, 0x8a, 0x2e, 0x68, 0x1f, 0x3c,
					0x1e, 0x09, 0x08, 0xef, 0x7b}
				return dcrutil.NewAddressSecpPubKey(serializedPubKey, &chaincfg.TestNetParams)
			},
			net: &chaincfg.TestNetParams,
		},
	}

	for _, test := range tests {
		// Decode addr and compare error against valid.
		decoded, err := dcrutil.DecodeAddress(test.addr, test.net)
		if (err == nil) != test.valid {
			t.Errorf("%v: decoding test failed: %v", test.name, err)
			return
		}

		if err == nil {
			// Ensure the stringer returns the same address as the
			// original.
			if decodedStringer, ok := decoded.(fmt.Stringer); ok {
				if test.addr != decodedStringer.String() {
					t.Errorf("%v: String on decoded value does not match expected value: %v != %v",
						test.name, test.addr, decodedStringer.String())
					return
				}
			}

			// Encode again and compare against the original.
			encoded := decoded.EncodeAddress()
			if test.encoded != encoded {
				t.Errorf("%v: decoding and encoding produced different addressess: %v != %v",
					test.name, test.encoded, encoded)
				return
			}

			// Perform type-specific calculations.
			var saddr []byte
			switch d := decoded.(type) {
			case *dcrutil.AddressPubKeyHash:
				saddr = dcrutil.TstAddressSAddr(encoded)

			case *dcrutil.AddressScriptHash:
				saddr = dcrutil.TstAddressSAddr(encoded)

// This example demonstrates how to use the Pool.StartWithdrawal method.
func Example_startWithdrawal() {
	// Create the address manager and votingpool DB namespace. See the example
	// for the Create() function for more info on how this is done.
	mgr, vpNamespace, tearDownFunc, err := exampleCreateMgrAndDBNamespace()
	if err != nil {
		fmt.Println(err)
		return
	}
	defer tearDownFunc()

	// Create a pool and a series. See the DepositAddress example for more info
	// on how this is done.
	pool, seriesID, err := exampleCreatePoolAndSeries(mgr, vpNamespace)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Unlock the manager
	if err := mgr.Unlock(privPassphrase); err != nil {
		fmt.Println(err)
		return
	}
	defer mgr.Lock()

	addr, _ := dcrutil.DecodeAddress("1MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", mgr.ChainParams())
	pkScript, _ := txscript.PayToAddrScript(addr)
	requests := []votingpool.OutputRequest{
		votingpool.OutputRequest{
			PkScript:    pkScript,
			Address:     addr,
			Amount:      1e6,
			Server:      "server-id",
			Transaction: 123},
	}
	changeStart, err := pool.ChangeAddress(seriesID, votingpool.Index(0))
	if err != nil {
		fmt.Println(err)
		return
	}
	// This is only needed because we have not used any deposit addresses from
	// the series, and we cannot create a WithdrawalAddress for an unused
	// branch/idx pair.
	if err = pool.EnsureUsedAddr(seriesID, votingpool.Branch(1), votingpool.Index(0)); err != nil {
		fmt.Println(err)
		return
	}
	startAddr, err := pool.WithdrawalAddress(seriesID, votingpool.Branch(1), votingpool.Index(0))
	if err != nil {
		fmt.Println(err)
		return
	}
	lastSeriesID := seriesID
	dustThreshold := dcrutil.Amount(1e4)
	currentBlock := int32(19432)
	roundID := uint32(0)
	txstore, tearDownFunc, err := exampleCreateTxStore()
	if err != nil {
		fmt.Println(err)
		return
	}
	_, err = pool.StartWithdrawal(
		roundID, requests, *startAddr, lastSeriesID, *changeStart, txstore, currentBlock,
		dustThreshold)
	if err != nil {
		fmt.Println(err)
	}

	// Output:
	//
}

func TestLimitAndSkipFetchTxsForAddr(t *testing.T) {
	testDb, err := setUpTestDb(t, "tstdbtxaddr")
	if err != nil {
		t.Errorf("Failed to open test database %v", err)
		return
	}
	defer testDb.cleanUpFunc()
	_, err = testDb.db.InsertBlock(testDb.blocks[0])
	if err != nil {
		t.Fatalf("failed to insert initial block")
	}
	// Insert a block with some fake test transactions. The block will have
	// 10 copies of a fake transaction involving same address.
	addrString := "DsZEAobx6qJ7K2qaHZBA2vBn66Nor8KYAKk"
	targetAddr, err := dcrutil.DecodeAddress(addrString, &chaincfg.MainNetParams)
	if err != nil {
		t.Fatalf("Unable to decode test address: %v", err)
	}
	outputScript, err := txscript.PayToAddrScript(targetAddr)
	if err != nil {
		t.Fatalf("Unable make test pkScript %v", err)
	}
	fakeTxOut := wire.NewTxOut(10, outputScript)
	var emptyHash chainhash.Hash
	fakeHeader := wire.NewBlockHeader(0, &emptyHash, &emptyHash, &emptyHash, 1, [6]byte{}, 1, 1, 1, 1, 1, 1, 1, 1, 1, [36]byte{})
	msgBlock := wire.NewMsgBlock(fakeHeader)
	for i := 0; i < 10; i++ {
		mtx := wire.NewMsgTx()
		mtx.AddTxOut(fakeTxOut)
		msgBlock.AddTransaction(mtx)
	}
	lastBlock := testDb.blocks[0]
	msgBlock.Header.PrevBlock = *lastBlock.Sha()
	// Insert the test block into the DB.
	testBlock := dcrutil.NewBlock(msgBlock)
	newheight, err := testDb.db.InsertBlock(testBlock)
	if err != nil {
		t.Fatalf("Unable to insert block into db: %v", err)
	}

	// Create and insert an address index for out test addr.
	txLoc, _, _ := testBlock.TxLoc()
	index := make(database.BlockAddrIndex, len(txLoc))
	for i := range testBlock.Transactions() {
		var hash160 [ripemd160.Size]byte
		scriptAddr := targetAddr.ScriptAddress()
		copy(hash160[:], scriptAddr[:])
		txAddrIndex := &database.TxAddrIndex{
			Hash160:  hash160,
			Height:   uint32(newheight),
			TxOffset: uint32(txLoc[i].TxStart),
			TxLen:    uint32(txLoc[i].TxLen),
		}

		index[i] = txAddrIndex
	}
	blkSha := testBlock.Sha()
	err = testDb.db.UpdateAddrIndexForBlock(blkSha, newheight, index)
	if err != nil {
		t.Fatalf("UpdateAddrIndexForBlock: failed to index"+
			" addrs for block #%d (%s) "+
			"err %v", newheight, blkSha, err)
		return
	}

	// Try skipping the first 4 results, should get 6 in return.
	txReply, err := testDb.db.FetchTxsForAddr(targetAddr, 4, 100000)
	if err != nil {
		t.Fatalf("Unable to fetch transactions for address: %v", err)
	}
	if len(txReply) != 6 {
		t.Fatalf("Did not correctly skip forward in txs for address reply"+
			" got %v txs, expected %v", len(txReply), 6)
	}

	// Limit the number of results to 3.
	txReply, err = testDb.db.FetchTxsForAddr(targetAddr, 0, 3)
	if err != nil {
		t.Fatalf("Unable to fetch transactions for address: %v", err)
	}
	if len(txReply) != 3 {
		t.Fatalf("Did not correctly limit in txs for address reply"+
			" got %v txs, expected %v", len(txReply), 3)
	}

	// Skip 1, limit 5.
	txReply, err = testDb.db.FetchTxsForAddr(targetAddr, 1, 5)
	if err != nil {
		t.Fatalf("Unable to fetch transactions for address: %v", err)
	}
	if len(txReply) != 5 {
		t.Fatalf("Did not correctly limit in txs for address reply"+
			" got %v txs, expected %v", len(txReply), 5)
	}
}

func main() {
	// 1. Load the UTXOs ----------------------------------------------------------
	unspentFile, err := os.Open("unspent.json")
	if err != nil {
		fmt.Println("error opening unspent file unspent.json", err.Error())
	}

	var utxos []dcrjson.ListUnspentResult

	jsonParser := json.NewDecoder(unspentFile)
	if err = jsonParser.Decode(&utxos); err != nil {
		fmt.Println("error parsing unspent file", err.Error())
	}

	// Sort the inputs so that the largest one is first.
	inputs := extendedOutPoints{convertJSONUnspentToOutPoints(utxos)}
	sort.Sort(sort.Reverse(inputs))

	// 2. Load the config ---------------------------------------------------------
	configFile, err := os.Open("config.json")
	if err != nil {
		fmt.Println("error opening config file config.json", err.Error())
	}

	cfg := new(configJSON)

	jsonParser = json.NewDecoder(configFile)
	if err = jsonParser.Decode(cfg); err != nil {
		fmt.Println("error parsing config file", err.Error())
	}

	// 3. Check the config and parse ----------------------------------------------
	switch cfg.Network {
	case "testnet":
		params = &chaincfg.TestNetParams
	case "mainnet":
		params = &chaincfg.MainNetParams
	case "simnet":
		params = &chaincfg.SimNetParams
	default:
		fmt.Println("Failed to parse a correct network")
		return
	}

	maxTxSize = params.MaximumBlockSize - 75000

	sendToAddress, err := dcrutil.DecodeAddress(cfg.SendToAddress, params)
	if err != nil {
		fmt.Println("Failed to parse tx address: ", err.Error())
	}

	// 4. Create the transaction --------------------------------------------------
	// First get how much we're sending.
	allInAmts := int64(0)
	var utxosToUse []*extendedOutPoint
	for _, utxo := range inputs.eops {
		utxosToUse = append(utxosToUse, utxo)
		allInAmts += utxo.amt
	}

	// Convert to KB.
	sz := float64(estimateTxSize(len(utxosToUse), 1)) / 1000
	feeEst := int64(math.Ceil(sz * float64(cfg.TxFee)))

	tx, err := makeTx(params, utxosToUse, sendToAddress, feeEst)
	if err != nil {
		fmt.Println("Couldn't produce tx: ", err.Error())
		return
	}

	if tx.SerializeSize() > maxTxSize {
		fmt.Printf("tx too big: got %v, max %v", tx.SerializeSize(),
			maxTxSize)
		return
	}

	// 5. Write the transactions to files in raw form with the proper command
	// required to sign them.
	txB, err := tx.Bytes()
	if err != nil {
		fmt.Println("Failed to serialize tx: ", err.Error())
		return
	}

	// The command to sign the transaction.
	var buf bytes.Buffer
	buf.WriteString("dcrctl ")
	buf.WriteString(cfg.DcrctlArgs)
	buf.WriteString(" signrawtransaction ")
	buf.WriteString(hex.EncodeToString(txB))
	buf.WriteString(" '[")
	last := len(utxosToUse) - 1
	for i, utxo := range utxosToUse {
		buf.WriteString("{\"txid\":\"")
		buf.WriteString(utxo.op.Hash.String())
		buf.WriteString("\",\"vout\":")
		buf.WriteString(fmt.Sprintf("%v", utxo.op.Index))
		buf.WriteString(",\"tree\":")
		buf.WriteString(fmt.Sprintf("%v", utxo.op.Tree))
		buf.WriteString(",\"scriptpubkey\":\"")
//.........這裏部分代碼省略.........

//.........這裏部分代碼省略.........
		if !cfg.CreateWatchingOnly {
			if err = createWallet(&cfg); err != nil {
				fmt.Fprintln(os.Stderr, "Unable to create wallet:", err)
				return loadConfigError(err)
			}
		} else if cfg.CreateWatchingOnly {
			if err = createWatchingOnlyWallet(&cfg); err != nil {
				fmt.Fprintln(os.Stderr, "Unable to create wallet:", err)
				return loadConfigError(err)
			}
		}

		// Created successfully, so exit now with success.
		os.Exit(0)
	} else if !dbFileExists && !cfg.NoInitialLoad {
		keystorePath := filepath.Join(netDir, keystore.Filename)
		keystoreExists, err := cfgutil.FileExists(keystorePath)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			return loadConfigError(err)
		}
		if !keystoreExists {
			err = fmt.Errorf("The wallet does not exist.  Run with the " +
				"--create option to initialize and create it.")
		} else {
			err = fmt.Errorf("The wallet is in legacy format.  Run with the " +
				"--create option to import it.")
		}
		fmt.Fprintln(os.Stderr, err)
		return loadConfigError(err)
	}

	if len(cfg.TicketAddress) != 0 {
		_, err := dcrutil.DecodeAddress(cfg.TicketAddress, activeNet.Params)
		if err != nil {
			err := fmt.Errorf("ticketaddress '%s' failed to decode: %v",
				cfg.TicketAddress, err)
			fmt.Fprintln(os.Stderr, err)
			fmt.Fprintln(os.Stderr, usageMessage)
			return loadConfigError(err)
		}
	}

	if len(cfg.PoolAddress) != 0 {
		_, err := dcrutil.DecodeAddress(cfg.PoolAddress, activeNet.Params)
		if err != nil {
			err := fmt.Errorf("pooladdress '%s' failed to decode: %v",
				cfg.PoolAddress, err)
			fmt.Fprintln(os.Stderr, err.Error())
			fmt.Fprintln(os.Stderr, usageMessage)
			return loadConfigError(err)
		}
	}

	if cfg.PoolFees != 0.0 {
		err := txrules.IsValidPoolFeeRate(cfg.PoolFees)
		if err != nil {
			err := fmt.Errorf("poolfees '%v' failed to decode: %v",
				cfg.PoolFees, err)
			fmt.Fprintln(os.Stderr, err.Error())
			fmt.Fprintln(os.Stderr, usageMessage)
			return loadConfigError(err)
		}
	}

	if cfg.RPCConnect == "" {

// PurchaseTickets purchases tickets from the wallet.
func (s *walletServer) PurchaseTickets(ctx context.Context,
	req *pb.PurchaseTicketsRequest) (*pb.PurchaseTicketsResponse, error) {
	// Unmarshall the received data and prepare it as input for the ticket
	// purchase request.
	spendLimit := dcrutil.Amount(req.SpendLimit)
	if spendLimit < 0 {
		return nil, grpc.Errorf(codes.InvalidArgument,
			"Negative spend limit given")
	}

	minConf := int32(req.RequiredConfirmations)

	var ticketAddr dcrutil.Address
	var err error
	if req.TicketAddress != "" {
		ticketAddr, err = dcrutil.DecodeAddress(req.TicketAddress,
			s.wallet.ChainParams())
		if err != nil {
			return nil, grpc.Errorf(codes.InvalidArgument,
				"Ticket address invalid: %v", err)
		}
	}

	var poolAddr dcrutil.Address
	if req.PoolAddress != "" {
		poolAddr, err = dcrutil.DecodeAddress(req.PoolAddress,
			s.wallet.ChainParams())
		if err != nil {
			return nil, grpc.Errorf(codes.InvalidArgument,
				"Pool address invalid: %v", err)
		}
	}

	if req.PoolFees > 0 {
		err = txrules.IsValidPoolFeeRate(req.PoolFees)
		if err != nil {
			return nil, grpc.Errorf(codes.InvalidArgument,
				"Pool fees amount invalid: %v", err)
		}
	}

	if req.PoolFees > 0 && poolAddr == nil {
		return nil, grpc.Errorf(codes.InvalidArgument,
			"Pool fees set but no pool address given")
	}

	if req.PoolFees <= 0 && poolAddr != nil {
		return nil, grpc.Errorf(codes.InvalidArgument,
			"Pool fees negative or unset but pool address given")
	}

	numTickets := int(req.NumTickets)
	if numTickets < 1 {
		return nil, grpc.Errorf(codes.InvalidArgument,
			"Zero or negative number of tickets given")
	}

	expiry := int32(req.Expiry)
	txFee := dcrutil.Amount(req.TxFee)
	ticketFee := dcrutil.Amount(req.TicketFee)

	if txFee < 0 || ticketFee < 0 {
		return nil, grpc.Errorf(codes.InvalidArgument,
			"Negative fees per KB given")
	}

	lock := make(chan time.Time, 1)
	defer func() {
		lock <- time.Time{} // send matters, not the value
	}()
	err = s.wallet.Unlock(req.Passphrase, lock)
	if err != nil {
		return nil, translateError(err)
	}

	resp, err := s.wallet.PurchaseTickets(0, spendLimit, minConf,
		ticketAddr, req.Account, numTickets, poolAddr, req.PoolFees,
		expiry, txFee, ticketFee)
	if err != nil {
		return nil, grpc.Errorf(codes.FailedPrecondition,
			"Unable to purchase tickets: %v", err)
	}

	respTyped, ok := resp.([]*chainhash.Hash)
	if !ok {
		return nil, grpc.Errorf(codes.Internal,
			"Unable to cast response as a slice of hash strings")
	}
	hashes := marshalHashes(respTyped)

	return &pb.PurchaseTicketsResponse{TicketHashes: hashes}, nil
}