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contract_helper.go
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contract_helper.go
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package thirdweb
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"math/big"
"net/http"
"time"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethclient"
"dario.cat/mergo"
)
type contractHelper struct {
address common.Address
nextOverrides *bind.TransactOpts
*ProviderHandler
}
const (
txWaitTimeBetweenAttempts = time.Second * 1
txMaxAttempts = 20
)
func newContractHelper(address common.Address, provider *ethclient.Client, privateKey string) (*contractHelper, error) {
if handler, err := NewProviderHandler(provider, privateKey); err != nil {
return nil, err
} else {
helper := &contractHelper{
address,
nil,
handler,
}
return helper, nil
}
}
func (helper *contractHelper) getAddress() common.Address {
return helper.address
}
func (helper *contractHelper) mergeOverrides(opts *bind.TransactOpts) (*bind.TransactOpts, error) {
if (helper.nextOverrides != nil) {
if err := mergo.Merge(opts, helper.nextOverrides); err != nil {
return nil, err
}
helper.nextOverrides = nil
}
return opts, nil
}
func (helper *contractHelper) OverrideNextTransaction(opts *bind.TransactOpts) {
helper.nextOverrides = opts
}
func (helper *contractHelper) getUnsignedTxOptions(ctx context.Context, signerAddress string) (*bind.TransactOpts, error) {
var tipCap, feeCap *big.Int
provider := helper.GetProvider()
block, err := provider.BlockByNumber(ctx, nil)
if err == nil && block.BaseFee() != nil {
tipCap, _ = big.NewInt(0).SetString("2500000000", 10)
baseFee := big.NewInt(0).Mul(block.BaseFee(), big.NewInt(2))
feeCap = big.NewInt(0).Add(baseFee, tipCap)
}
txOpts := &bind.TransactOpts{
Context: ctx,
NoSend: true,
From: common.HexToAddress(signerAddress),
GasTipCap: tipCap,
GasFeeCap: feeCap,
}
txOpts.Signer = func(address common.Address, transaction *types.Transaction) (*types.Transaction, error) {
return transaction, nil
}
txOpts, err = helper.mergeOverrides(txOpts)
if err != nil {
return nil, err
}
return txOpts, nil
}
func (helper *contractHelper) getEncodedTxOptions(ctx context.Context) (*bind.TransactOpts, error) {
return helper.getRawTxOptions(ctx, true)
}
func (helper *contractHelper) GetTxOptions(ctx context.Context) (*bind.TransactOpts, error) {
return helper.getRawTxOptions(ctx, false)
}
func (helper *contractHelper) getRawTxOptions(ctx context.Context, noSend bool) (*bind.TransactOpts, error) {
if helper.GetRawPrivateKey() == "" {
return nil, fmt.Errorf("You need to set a private key to use this function!")
}
var tipCap, feeCap *big.Int
provider := helper.GetProvider()
chainId, err := provider.ChainID(ctx)
if err != nil {
return nil, err
}
block, err := provider.BlockByNumber(ctx, nil)
if err == nil && block.BaseFee() != nil {
// Use gas station to get maxPriorityFeePerGas if we're on polygon
if chainId.Cmp(big.NewInt(137)) == 0 {
tipCap, _ = helper.getPolygonGasPriorityFee(ctx)
} else {
tipCap, _ = big.NewInt(0).SetString("2500000000", 10) // maxPriorityFeePerGas
}
baseFee := big.NewInt(0).Mul(block.BaseFee(), big.NewInt(2))
feeCap = big.NewInt(0).Add(baseFee, tipCap) // maxFeePerGas
}
signer, err := helper.getSigner(ctx)
if err != nil {
return nil, err
}
txOpts := &bind.TransactOpts{
Context: ctx,
NoSend: noSend,
From: helper.GetSignerAddress(),
Signer: signer,
GasTipCap: tipCap, // maxPriorityFeePerGas
GasFeeCap: feeCap, // maxFeePerGas
}
txOpts, err = helper.mergeOverrides(txOpts)
if err != nil {
return nil, err
}
return txOpts, nil
}
func (helper *contractHelper) AwaitTx(ctx context.Context, hash common.Hash) (*types.Transaction, error) {
provider := helper.GetProvider()
wait := txWaitTimeBetweenAttempts
maxAttempts := uint8(txMaxAttempts)
attempts := uint8(0)
var syncError error
for {
if attempts >= maxAttempts {
fmt.Println("Retry attempts to get tx exhausted, tx might have failed")
return nil, syncError
}
if tx, isPending, err := provider.TransactionByHash(ctx, hash); err != nil {
syncError = err
log.Printf("Failed to get tx %v, err = %v\n", hash.String(), err)
attempts += 1
time.Sleep(wait)
continue
} else {
if isPending {
log.Println("Transaction still pending...")
time.Sleep(wait)
continue
}
log.Printf("Transaction with hash %v mined successfully\n", tx.Hash())
return tx, nil
}
}
}
func (helper *contractHelper) getPolygonGasPriorityFee(ctx context.Context) (*big.Int, error) {
getTipCap := func() (*big.Int, error) {
req, err := http.NewRequestWithContext(ctx, "GET", "https://gasstation-mainnet.matic.network/v2", nil)
if err != nil {
return nil, err
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
bodyBytes, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
var feeData map[string]map[string]interface{}
json.Unmarshal(bodyBytes, &feeData)
priorityFee, ok := feeData["standard"]["maxPriorityFee"].(float64)
if !ok {
return nil, err
}
return parseUnits(priorityFee, 9) // maxPriorityFeePerGas
}
tipCap, err := getTipCap()
if err == nil {
return tipCap, nil
}
return parseUnits(31, 9)
}