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approve_erc20_processor.ts
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approve_erc20_processor.ts
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/**
* @license
* The MIT License
*
* Copyright (c) 2019 Celer Network
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import { ethers, Signer } from 'ethers';
import { Erc20Factory } from '../abi/Erc20Factory';
import { ContractsInfo } from '../api/contracts_info';
const APPROVAL_AMOUNT = ethers.utils.parseEther('1e32');
export class ApproveErc20Processor {
private readonly signer: Signer;
private readonly contractsInfo: ContractsInfo;
constructor(signer: Signer, contractsInfo: ContractsInfo) {
this.signer = signer;
this.contractsInfo = contractsInfo;
}
async approveIfNecessary(tokenAddress: string): Promise<string> {
const signer = this.signer;
const ledgerAddress = ethers.utils.getAddress(
this.contractsInfo.celerLedgerAddress
);
const tokenContract = Erc20Factory.connect(tokenAddress, signer);
const selfAddress = await signer.getAddress();
const allowance = await tokenContract.functions.allowance(
selfAddress,
ledgerAddress
);
if (allowance.eq(APPROVAL_AMOUNT)) {
return '';
}
const tx = await tokenContract.functions.approve(
ledgerAddress,
APPROVAL_AMOUNT
);
const receipt = await tx.wait();
const txHash = tx.hash;
if (receipt.status === 0) {
throw new Error(`Approve tx ${txHash} failed`);
}
return txHash;
}
}