Golang RPCClient.ExistsAddress方法代碼示例

// accountIsUsed checks if an account has ever been used by scanning the
// first acctSeekWidth many addresses for usage.
func (w *Wallet) accountIsUsed(account uint32, chainClient *chain.RPCClient) bool {
	// Search external branch then internal branch for a used
	// address. We need to set the address function to use based
	// on whether or not this is the initial sync. The function
	// AddressDerivedFromCointype is able to see addresses that
	// exists in accounts that have not yet been created, while
	// AddressDerivedFromDbAcct can not.
	addrFunc := w.Manager.AddressDerivedFromDbAcct
	if w.initiallyUnlocked {
		addrFunc = w.Manager.AddressDerivedFromCointype
	}

	for branch := uint32(0); branch < 2; branch++ {
		for i := uint32(0); i < acctSeekWidth; i++ {
			var addr dcrutil.Address
			err := walletdb.View(w.db, func(tx walletdb.ReadTx) error {
				addrmgrNs := tx.ReadBucket(waddrmgrNamespaceKey)
				var err error
				addr, err = addrFunc(addrmgrNs, i, account, branch)
				return err
			})
			if err != nil {
				// Skip erroneous keys, which happen rarely.
				continue
			}

			exists, err := chainClient.ExistsAddress(addr)
			if err != nil {
				return false
			}
			if exists {
				return true
			}
		}
	}

	return false
}

// debugAccountAddrGapsString is a debug function that prints a graphical outlook
// of address usage to a string, from the perspective of the daemon.
func debugAccountAddrGapsString(chainClient *chain.RPCClient, scanBackFrom uint32,
	account uint32, branch uint32, w *Wallet) (string, error) {

	var buf bytes.Buffer
	str := fmt.Sprintf("Begin debug address scan scanning backwards from "+
		"idx %v, account %v, branch %v\n", scanBackFrom, account, branch)
	buf.WriteString(str)
	var firstUsedIndex uint32
	for i := scanBackFrom; i > 0; i-- {
		var addr dcrutil.Address
		err := walletdb.View(w.db, func(tx walletdb.ReadTx) error {
			addrmgrNs := tx.ReadBucket(waddrmgrNamespaceKey)
			var err error
			addr, err = w.Manager.AddressDerivedFromDbAcct(addrmgrNs,
				i, account, branch)
			return err
		})
		// Skip erroneous keys.
		if err != nil {
			continue
		}

		exists, err := chainClient.ExistsAddress(addr)
		if err != nil {
			return "", fmt.Errorf("failed to access chain server: %v",
				err)
		}

		if exists {
			firstUsedIndex = i
			break
		}
	}

	str = fmt.Sprintf("Last used index found: %v\n", firstUsedIndex)
	buf.WriteString(str)

	var batchSize uint32 = 50
	batches := (firstUsedIndex / batchSize) + 1
	var lastBatchSize uint32
	if firstUsedIndex%batchSize != 0 {
		lastBatchSize = firstUsedIndex - ((batches - 1) * batchSize)
	}

	for i := uint32(0); i < batches; i++ {
		str = fmt.Sprintf("%8v", i*batchSize)
		buf.WriteString(str)

		start := i * batchSize
		end := (i + 1) * batchSize
		if i == batches-1 {
			// Nothing to do because last batch empty.
			if lastBatchSize == 0 {
				break
			}
			end = (i*batchSize + lastBatchSize) + 1
		}

		for j := start; j < end; j++ {
			if j%10 == 0 {
				buf.WriteString("  ")
			}

			char := "_"
			var addr dcrutil.Address
			err := walletdb.View(w.db, func(tx walletdb.ReadTx) error {
				addrmgrNs := tx.ReadBucket(waddrmgrNamespaceKey)
				var err error
				addr, err = w.Manager.AddressDerivedFromDbAcct(addrmgrNs,
					j, account, branch)
				return err
			})
			if err != nil {
				char = "X"
			}

			exists, err := chainClient.ExistsAddress(addr)
			if err != nil {
				return "", fmt.Errorf("failed to access chain server: %v",
					err)
			}
			if exists {
				char = "#"
			}

			buf.WriteString(char)
		}

		buf.WriteString("\n")
	}

	return buf.String(), nil
}