导入 ethclient 和公共库时出错

Question

我正在编写一个脚本来与智能合约交互：

package main
import (
    "context"
    "fmt"
    "log"
    "github.com/ethereum/go-ethereum"
    "github.com/joho/godotenv"
)
var myenv map[string]string
const envLoc = ".env"
func loadEnv() {
    var err error
    if myenv, err = godotenv.Read(envLoc); err != nil {
        log.Printf("could not load env from %s: %v", envLoc, err)
    }
}
func main() {
    loadEnv()
    ctx := context.Background()
    client, err := ethclient.Dial(os.Getenv("GATEWAY"))
    if err != nil {
        log.Fatalf("could not connect to Ethereum gateway: %vn", err)
    }
    defer client.Close()
    accountAddress := common.HexToAddress("786af135e476c3b6061482e90c6273b8ee78c159")
    balance, _ := client.BalanceAt(ctx, accountAddress, nil)
    fmt.Printf("Balance: %dn", balance)
}

我得到未定义的ethclient和未定义的common。导入曾经工作正常，我想我已经使用了一些命令来 dlet 库，或者我正在使用从另一个文件夹导入

Answer 1

确保导入正确的包。下面是一个工作示例：

package main
import (
    "context"
    "fmt"
    "log"
    "os"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
    "github.com/joho/godotenv"
)
func main() {
    err := godotenv.Load()
    if err != nil {
        log.Fatal("Error loading .env file")
    }
    ctx := context.Background()
    fmt.Println(os.Getenv("GATEWAY"))
    client, err := ethclient.Dial(os.Getenv("GATEWAY"))
    if err != nil {
        log.Fatalf("could not connect to Ethereum gateway: %vn", err)
    }
    defer client.Close()
    accountAddress := common.HexToAddress("786af135e476c3b6061482e90c6273b8ee78c159")
    balance, _ := client.BalanceAt(ctx, accountAddress, nil)
    fmt.Printf("Balance: %dn", balance)
}

Answer 2

您没有导入代码正在使用的包。

1. 添加import "github.com/ethereum/go-ethereum/ethclient"
2. 我不确定common包应该在哪里，但您也缺少导入。