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erc20.go
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erc20.go
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// Copyright 2020 ChainSafe Systems
// SPDX-License-Identifier: LGPL-3.0-only
package utils
import (
"math/big"
"github.com/egorgripasov/ChainBridge/bindings/ERC20Handler"
ERC20 "github.com/egorgripasov/ChainBridge/bindings/ERC20PresetMinterPauser"
"github.com/egorgripasov/chainbridge-utils/msg"
"github.com/ethereum/go-ethereum/common"
)
// DeployMintAndApprove deploys a new erc20 contract, mints to the deployer, and approves the erc20 handler to transfer those token.
func DeployMintApproveErc20(client *Client, erc20Handler common.Address, amount *big.Int) (common.Address, error) {
err := client.LockNonceAndUpdate()
if err != nil {
return ZeroAddress, err
}
// Deploy
erc20Addr, tx, erc20Instance, err := ERC20.DeployERC20PresetMinterPauser(client.Opts, client.Client, "", "")
if err != nil {
return ZeroAddress, err
}
err = WaitForTx(client, tx)
if err != nil {
return ZeroAddress, err
}
client.UnlockNonce()
// Mint
err = client.LockNonceAndUpdate()
if err != nil {
return ZeroAddress, err
}
tx, err = erc20Instance.Mint(client.Opts, client.Opts.From, amount)
if err != nil {
return ZeroAddress, err
}
err = WaitForTx(client, tx)
if err != nil {
return ZeroAddress, err
}
client.UnlockNonce()
// Approve
err = client.LockNonceAndUpdate()
if err != nil {
return ZeroAddress, err
}
tx, err = erc20Instance.Approve(client.Opts, erc20Handler, amount)
if err != nil {
return ZeroAddress, err
}
err = WaitForTx(client, tx)
if err != nil {
return ZeroAddress, err
}
client.UnlockNonce()
return erc20Addr, nil
}
func DeployAndMintErc20(client *Client, amount *big.Int) (common.Address, error) {
err := client.LockNonceAndUpdate()
if err != nil {
return ZeroAddress, err
}
// Deploy
erc20Addr, tx, erc20Instance, err := ERC20.DeployERC20PresetMinterPauser(client.Opts, client.Client, "", "")
if err != nil {
return ZeroAddress, err
}
err = WaitForTx(client, tx)
if err != nil {
return ZeroAddress, err
}
client.UnlockNonce()
// Mint
err = client.LockNonceAndUpdate()
if err != nil {
return ZeroAddress, err
}
mintTx, err := erc20Instance.Mint(client.Opts, client.Opts.From, amount)
if err != nil {
return ZeroAddress, err
}
err = WaitForTx(client, mintTx)
if err != nil {
return ZeroAddress, err
}
client.UnlockNonce()
return erc20Addr, nil
}
func Erc20Approve(client *Client, erc20Contract, recipient common.Address, amount *big.Int) error {
err := client.LockNonceAndUpdate()
if err != nil {
return err
}
instance, err := ERC20.NewERC20PresetMinterPauser(erc20Contract, client.Client)
if err != nil {
return err
}
tx, err := instance.Approve(client.Opts, recipient, amount)
if err != nil {
return err
}
err = WaitForTx(client, tx)
if err != nil {
return err
}
client.UnlockNonce()
return nil
}
func Erc20GetBalance(client *Client, erc20Contract, account common.Address) (*big.Int, error) { //nolint:unused,deadcode
instance, err := ERC20.NewERC20PresetMinterPauser(erc20Contract, client.Client)
if err != nil {
return nil, err
}
bal, err := instance.BalanceOf(client.CallOpts, account)
if err != nil {
return nil, err
}
return bal, nil
}
func FundErc20Handler(client *Client, handlerAddress, erc20Address common.Address, amount *big.Int) error {
err := Erc20Approve(client, erc20Address, handlerAddress, amount)
if err != nil {
return err
}
instance, err := ERC20Handler.NewERC20Handler(handlerAddress, client.Client)
if err != nil {
return err
}
client.Opts.Nonce = client.Opts.Nonce.Add(client.Opts.Nonce, big.NewInt(1))
tx, err := instance.FundERC20(client.Opts, erc20Address, client.Opts.From, amount)
if err != nil {
return err
}
err = WaitForTx(client, tx)
if err != nil {
return err
}
return nil
}
func Erc20AddMinter(client *Client, erc20Contract, handler common.Address) error {
err := client.LockNonceAndUpdate()
if err != nil {
return err
}
instance, err := ERC20.NewERC20PresetMinterPauser(erc20Contract, client.Client)
if err != nil {
return err
}
role, err := instance.MINTERROLE(client.CallOpts)
if err != nil {
return err
}
tx, err := instance.GrantRole(client.Opts, role, handler)
if err != nil {
return err
}
err = WaitForTx(client, tx)
if err != nil {
return err
}
client.UnlockNonce()
return nil
}
func Erc20GetAllowance(client *Client, erc20Contract, owner, spender common.Address) (*big.Int, error) {
instance, err := ERC20.NewERC20PresetMinterPauser(erc20Contract, client.Client)
if err != nil {
return nil, err
}
amount, err := instance.Allowance(client.CallOpts, owner, spender)
if err != nil {
return nil, err
}
return amount, nil
}
func Erc20GetResourceId(client *Client, handler common.Address, rId msg.ResourceId) (common.Address, error) {
instance, err := ERC20Handler.NewERC20Handler(handler, client.Client)
if err != nil {
return ZeroAddress, err
}
addr, err := instance.ResourceIDToTokenContractAddress(client.CallOpts, rId)
if err != nil {
return ZeroAddress, err
}
return addr, nil
}
func Erc20Mint(client *Client, erc20Address, recipient common.Address, amount *big.Int) error {
err := client.LockNonceAndUpdate()
if err != nil {
return err
}
instance, err := ERC20.NewERC20PresetMinterPauser(erc20Address, client.Client)
if err != nil {
return err
}
tx, err := instance.Mint(client.Opts, recipient, amount)
if err != nil {
return err
}
err = WaitForTx(client, tx)
if err != nil {
return err
}
client.UnlockNonce()
return nil
}