Created
August 29, 2021 20:34
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pre flight checks for paying gas in ERC20 token
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| const appRoot = require("app-root-path"); | |
| var log = require(`${appRoot}/config/winston`).logger(module); | |
| const config = require(`${appRoot}/config`); | |
| const cache = require(`${appRoot}/src/services/caching`); | |
| const ethers = require("ethers"); | |
| const { | |
| getGasPriceKey, | |
| } = require(`${appRoot}/src/controllers/utils/cache-utils`); | |
| const TOKEN_GAS_PRICE_THRESHOLD_PERCENTAGE = | |
| config.TOKEN_GAS_PRICE_THRESHOLD_PERCENTAGE; | |
| const getPreFlightChecks = async ( | |
| networkId, | |
| oracleAggregatorContract, | |
| forwardRequest | |
| ) => { | |
| let result = {}; | |
| result.readyToPayGasInTokens = false; | |
| try { | |
| let gasPriceFromCache = await cache.get( | |
| getGasPriceKey(networkId, config.networksGasPriceType[networkId]) | |
| ); | |
| let tokenAddress = forwardRequest.token; | |
| const tokenGasPriceFromRequest = ethers.BigNumber.from( | |
| forwardRequest.tokenGasPrice | |
| ); | |
| const tokenPriceCurrent = await oracleAggregatorContract.getTokenPrice( | |
| tokenAddress | |
| ); | |
| const tokenOracleDecimals = await oracleAggregatorContract.getTokenOracleDecimals( | |
| tokenAddress | |
| ); | |
| /* should probably assume use of high gas price and calculate from different sources on the go (upvest,gasstation,etherscan) and avergae out | |
| same for the oracle vs token price fetch apis - coingecko etc | |
| add robustness for calcs | |
| //todo | |
| */ | |
| const gasPrice = ethers.BigNumber.from( | |
| ethers.utils.parseUnits(gasPriceFromCache.toString(), "wei").toString() | |
| ); | |
| const tokenGasPriceCurrent = ethers.BigNumber.from(gasPrice) | |
| .mul(ethers.BigNumber.from(10).pow(tokenOracleDecimals)) | |
| .div(tokenPriceCurrent); | |
| if (tokenGasPriceCurrent && tokenPriceCurrent && tokenOracleDecimals) { | |
| log.info(`token price ${tokenPriceCurrent.toString()}`); | |
| log.info(`token oracle decimals ${tokenOracleDecimals.toString()}`); | |
| log.info(`token gas price ${tokenGasPriceCurrent.toString()}`); | |
| var minimumTokenGasPriceAccepted = ethers.BigNumber.from( | |
| TOKEN_GAS_PRICE_THRESHOLD_PERCENTAGE | |
| ) | |
| .mul(ethers.BigNumber.from(tokenGasPriceCurrent)) | |
| .div(ethers.BigNumber.from(100)); | |
| if (tokenGasPriceFromRequest.lte(minimumTokenGasPriceAccepted)) { | |
| log.info("Not favorable to process this transaction"); | |
| result.errorMessage = | |
| "$token/ETH pair price has dropped beyond threshold"; | |
| } else { | |
| result.readyToPayGasInTokens = true; | |
| } | |
| } | |
| } catch (error) { | |
| log.info("Error while getting data points for pre flight checks"); | |
| result.errorMessage = error.toString(); | |
| log.error(error); | |
| } | |
| log.info(`ready to pay in ERC20 tokens? ${result.readyToPayGasInTokens}`); | |
| return result; | |
| }; | |
| module.exports = { getPreFlightChecks }; |
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