package main<\/p>\n
import (
\n“context”
\n“crypto\/ecdsa”
\n“fmt”
\n“log”
\n“math\/big”<\/p>\n
“github.com\/doragogo\/go-doragogo\/common”
\n“github.com\/doragogo\/go-doragogo\/core\/types”
\n“github.com\/doragogo\/go-doragogo\/crypto”
\n“github.com\/doragogo\/go-doragogo\/crypto\/sha3”
\n“github.com\/doragogo\/go-doragogo\/ethclient”
\n)<\/p>\n
func sendExternalRawTransaction(receiveAddress string, amount float64) (transaction string) {
\n\/\/Ropsten\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u63a5\u7d9a
\nclient, err := ethclient.Dial(“https:\/\/ropsten.infura.io”)
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
\/\/PrivateKey\u3092\u8aad\u307f\u8fbc\u3080
\nprivateKey, err := crypto.HexToECDSA(“f47321dc18a9bcafa063d0980cbcdcb1ff19e7430bf501612c21da0648cf2f8”)
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
\/\/\u3000PrivateKey\u304b\u3089Publickey\u3092\u751f\u6210
\npublicKey := privateKey.Public()
\npublicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
\nif !ok {
\nlog.Fatal(“Error casting public key to ECDSA”)
\n}<\/p>\n
\/\/PublicKey\u304b\u3089\u3001\u9001\u91d1\u4e3b\u30a2\u30c9\u30ec\u30b9\u3092\u751f\u6210
\nfromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)<\/p>\n
\/\/Ropsten\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u3001Nonce\u60c5\u5831\u3092\u8aad\u307f\u53d6\u308b
\nnonce, err := client.PendingNonceAt(context.Background(), fromAddress)
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
\/\/\u30c8\u30fc\u30af\u30f3\u9001\u91d1Transaction\u3092\u30c6\u30b9\u30c8\u30cd\u30c3\u30c8\u9001\u308b\u305f\u3081\u306egasLimit\u3001
\nvalue := big.NewInt(0) \/\/\uff08\u30aa\u30d7\u30b7\u30e7\u30f3\uff09\u5f8c\u3067\u4f7f\u7528\u3059\u308b\u95a2\u6570NewTransaction\u306e\u5f15\u6570\u3067\u5fc5\u8981\u306b\u306a\u308b\u305f\u3081\u8a2d\u5b9a\u3002Transaction\u3068\u540c\u6642\u306b\u9001\u308bETH\u306e\u91cf\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002
\ngasLimit := uint64(2000000)<\/p>\n
\/\/\u30ed\u30d7\u30b9\u30c6\u30f3\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u3001\u73fe\u5728\u306egasPrice\u3092\u53d6\u5f97\u3002\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u30de\u30a4\u30cb\u30f3\u30b0\u3055\u308c\u305a\u306b\u653e\u7f6e\u3055\u308c\u308b\u3053\u3068\u3092\u9632\u3050\u3002
\ngasPrice, err := client.SuggestGasPrice(context.Background())
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
\/\/\u9001\u91d1\u5148\u3092\u6307\u5b9a
\ntoAddress := common.HexToAddress(receiveAddress)
\n\/\/\u30c8\u30fc\u30af\u30f3\u30b3\u30f3\u30c8\u30e9\u30af\u30c8\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u5b9a
\ntokenAddress := common.HexToAddress(“0x43aff81f88c18bc85281039df68002872b233afc”)
\n\/\/ERC20\u306e\u3069\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u304b\u6307\u5b9a\u3002https:\/\/github.com\/ethereum\/wiki\/wiki\/JSON-RPC#eth_sendtransaction
\ntransferFnSignature := []byte(“transfer(address,uint256)”)
\n\/\/hash\u5316\u3057\u3001\u5148\u982d\u304b\u30894\u30d0\u30a4\u30c8\u307e\u3067\u53d6\u5f97\u3002\u3053\u308c\u3067\u4f7f\u7528\u3059\u308b\u95a2\u6570\u3092\u6307\u5b9a\u3057\u305f\u3053\u3068\u306b\u306a\u308b\u3002
\nhash := sha3.NewKeccak256()
\nhash.Write(transferFnSignature)
\nmethodID := hash.Sum(nil)[:4]<\/p>\n
\/\/0\u57cb\u3081
\npaddedAddress := common.LeftPadBytes(toAddress.Bytes(), 32)
\n\/\/\u9001\u91d1\u984d\u3092\u8a2d\u5b9a
\npIntAmount := big.NewInt(int64(amount))
\n\/\/0\u57cb\u3081
\npaddedAmount := common.LeftPadBytes(pIntAmount.Bytes(), 32)<\/p>\n
\/\/\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3067\u9001\u308b\u30c7\u30fc\u30bf\u3092\u4f5c\u6210
\nvar data []byte
\ndata = append(data, methodID…)
\ndata = append(data, paddedAddress…)
\ndata = append(data, paddedAmount…)<\/p>\n
\/***** Preparing signed transaction *****\/
\ntx := types.NewTransaction(nonce, tokenAddress, value, gasLimit, gasPrice, data)
\nsignedTx, err := types.SignTx(tx, types.HomesteadSigner{}, privateKey)
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
\/\/\u30b5\u30a4\u30f3\u3057\u305f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092RopstenNetwork\u306b\u9001\u308b\u3002
\nerr = client.SendTransaction(context.Background(), signedTx)
\nif err != nil {
\nlog.Fatal(err)
\n}<\/p>\n
fmt.Printf(“Signed tx sent: %s”, signedTx.Hash().Hex())<\/p>\n
return signedTx.Hash().Hex()
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
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