账户余额

读取一个账户的余额相当简单。调用客户端的BalanceAt方法,给它传递账户地址和可选的区块号。将区块号设置为nil将返回最新的余额。

account := common.HexToAddress("0x71c7656ec7ab88b098defb751b7401b5f6d8976f")
balance, err := client.BalanceAt(context.Background(), account, nil)
if err != nil {
  log.Fatal(err)
}

fmt.Println(balance) // 25893180161173005034

传区块号能让您读取该区块时的账户余额。区块号必须是big.Int类型。

blockNumber := big.NewInt(5532993)
balance, err := client.BalanceAt(context.Background(), account, blockNumber)
if err != nil {
  log.Fatal(err)
}

fmt.Println(balance) // 25729324269165216042

以太坊中的数字是使用尽可能小的单位来处理的,因为它们是定点精度,在ETH中它是wei。要读取ETH值,您必须做计算wei/10^18。因为我们正在处理大数,我们得导入原生的Gomathmath/big包。这是您做的转换。

fbalance := new(big.Float)
fbalance.SetString(balance.String())
ethValue := new(big.Float).Quo(fbalance, big.NewFloat(math.Pow10(18)))

fmt.Println(ethValue) // 25.729324269165216041

待处理的余额

有时您想知道待处理的账户余额是多少,例如,在提交或等待交易确认后。客户端提供了类似BalanceAt的方法,名为PendingBalanceAt,它接收账户地址作为参数。

pendingBalance, err := client.PendingBalanceAt(context.Background(), account)
fmt.Println(pendingBalance) // 25729324269165216042

完整代码

account_balance.go

package main

import (
    "context"
    "fmt"
    "log"
    "math"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, err := ethclient.Dial("https://mainnet.infura.io")
    if err != nil {
        log.Fatal(err)
    }

    account := common.HexToAddress("0x71c7656ec7ab88b098defb751b7401b5f6d8976f")
    balance, err := client.BalanceAt(context.Background(), account, nil)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(balance) // 25893180161173005034

    blockNumber := big.NewInt(5532993)
    balanceAt, err := client.BalanceAt(context.Background(), account, blockNumber)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(balanceAt) // 25729324269165216042

    fbalance := new(big.Float)
    fbalance.SetString(balanceAt.String())
    ethValue := new(big.Float).Quo(fbalance, big.NewFloat(math.Pow10(18)))
    fmt.Println(ethValue) // 25.729324269165216041

    pendingBalance, err := client.PendingBalanceAt(context.Background(), account)
    fmt.Println(pendingBalance) // 25729324269165216042
}

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