golang获取eth最新区块

ethereum扫描区块，获取区块内的交易记录

一、使用geth方法

package main

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

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

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

    header, err := client.HeaderByNumber(context.Background(), nil)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(header.Number.String()) // 5671744
}

二、使用rpc方法

func GetBlockNumber(client *rpc.Client) int {
    ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
    defer cancel()
    type Block struct {
        Number string
    }
    var lastBlock Block
    err := client.CallContext(ctx, &lastBlock, "eth_getBlockByNumber", "latest", true)
    if err != nil {
        fmt.Println("can't get latest block:", err)
        return 0
    }

    var blockNumber, err1 = strconv.ParseInt(lastBlock.Number, 0, 64)
    //blockNumber, err1 := strconv.Atoi(lastBlock.Number)
    if err1 != nil {
        fmt.Println("strconv error:", err1)
        return 0
    }
    fmt.Println("number: ", blockNumber)
    return int(blockNumber)
}