golang监听以太坊出块及交易

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package main

import (
	"context"
	"fmt"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"
	"log"
)

func main() {
	client,err := ethclient.Dial("wss://mainnet.infura.io/ws/v3/80d7c83efe29424c99930c19a6980114")
	if err != nil{
		log.Fatal(1,err)
	}
	chainID, err := client.NetworkID(context.Background())
	if err != nil {
		log.Fatal(2,err)
	}
	defer func() {
		if err := recover();err != nil{
			fmt.Println(err)
		}
	}()

	//for{
	//	fromBlock ,err := client.BlockNumber(context.Background())
	//	if err != nil{
	//		log.Fatal(3,err)
	//	}
	//	block,err := client.BlockByNumber(context.Background(),new(big.Int).SetUint64(fromBlock))
	//	if err != nil{
	//		log.Fatal(4,err)
	//	}
	//	for _,tx := range block.Transactions(){
	//		message,err := tx.AsMessage(types.LatestSignerForChainID(chainID),tx.GasPrice())
	//		if err != nil{
	//			log.Fatal(5,err)
	//		}
	//		switch message.From().Hex() {
	//		case "":
	//			fmt.Println("txHash: ",tx.Hash().Hex())
	//			fmt.Println("from: ",message.From().Hex())
	//			if message.To() != nil{
	//				fmt.Println("to: ",message.To().Hex())
	//			}
	//			fmt.Println("value: ",tx.Value().String())
	//			fmt.Println("------------------------------------------------")
	//		default:
	//			fmt.Println("txHash: ",tx.Hash().Hex())
	//			fmt.Println("from: ",message.From().Hex())
	//			if message.To() != nil {
	//				fmt.Println("to: ", message.To().Hex())
	//			}
	//			fmt.Println("value: ",tx.Value().String())
	//			fmt.Println("------------------------------------------------")
	//		}
	//	}
	//}


	for{
		headers := make(chan *types.Header)
		sub,err := client.SubscribeNewHead(context.Background(),headers)
		if err != nil{
			log.Fatal(1,err)
		}
		for {
			select {
			case err := <- sub.Err():
				log.Fatal(err)
			case header := <- headers:
				block,err := client.BlockByHash(context.Background(),header.Hash())
				if err != nil{
					log.Fatal(2,err)
				}
				for _,tx := range block.Transactions(){
					message,err := tx.AsMessage(types.LatestSignerForChainID(chainID),tx.GasPrice())
					if err != nil{
						log.Fatal(3,err)
					}
					switch message.From().Hex() {
					case "":
						fmt.Println("txHash: ",tx.Hash().Hex())
						fmt.Println("from: ",message.From().Hex())
						if message.To() != nil{
							fmt.Println("to: ",message.To().Hex())
						}
						fmt.Println("value: ",tx.Value().String())
						fmt.Println("------------------------------------------------")
					default:
						fmt.Println("txHash: ",tx.Hash().Hex())
						fmt.Println("from: ",message.From().Hex())
						if message.To() != nil {
							fmt.Println("to: ", message.To().Hex())
						}
						fmt.Println("value: ",tx.Value().String())
						fmt.Println("------------------------------------------------")
					}
				}
			}
		}
	}
}