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package main
import (
"context"
"crypto/ecdsa"
"fmt"
"log"
"math/big"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethclient"
store "./contracts" // for demo
)
func main() {
client, err := ethclient.Dial("https://rinkeby.infura.io")
if err != nil {
log.Fatal(err)
}
privateKey, err := crypto.HexToECDSA("fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19")
if err != nil {
log.Fatal(err)
}
publicKey := privateKey.Public()
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
if !ok {
log.Fatal("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
}
fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
nonce, err := client.PendingNonceAt(context.Background(), fromAddress)
if err != nil {
log.Fatal(err)
}
gasPrice, err := client.SuggestGasPrice(context.Background())
if err != nil {
log.Fatal(err)
}
auth := bind.NewKeyedTransactor(privateKey)
auth.Nonce = big.NewInt(int64(nonce))
auth.Value = big.NewInt(0) // in wei
auth.GasLimit = uint64(300000) // in units
auth.GasPrice = gasPrice
address := common.HexToAddress("0x147B8eb97fD247D06C4006D269c90C1908Fb5D54")
instance, err := store.NewStore(address, client)
if err != nil {
log.Fatal(err)
}
key := [32]byte{}
value := [32]byte{}
copy(key[:], []byte("foo"))
copy(value[:], []byte("bar"))
tx, err := instance.SetItem(auth, key, value)
if err != nil {
log.Fatal(err)
}
fmt.Printf("tx sent: %s", tx.Hash().Hex()) // tx sent: 0x8d490e535678e9a24360e955d75b27ad307bdfb97a1dca51d0f3035dcee3e870
result, err := instance.Items(nil, key)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(result[:])) // "bar"
}