88 lines
2.8 KiB
JavaScript
88 lines
2.8 KiB
JavaScript
const fetch = require('node-fetch')
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const Web3 = require('web3')
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const { gasOracleUrls, defaultGasPrice, oracleRpcUrl, oracleAddress } = require('../config')
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const { getArgsForOracle } = require('./utils')
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const { redisClient } = require('./redis')
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const priceOracleABI = require('../abis/PriceOracle.abi.json')
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class Fetcher {
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constructor(web3) {
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this.web3 = web3
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this.oracleWeb3 = new Web3(oracleRpcUrl)
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this.oracle = new this.oracleWeb3.eth.Contract(priceOracleABI, oracleAddress)
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this.ethPrices = {
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dai: '6700000000000000', // 0.0067
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cdai: '157380000000000',
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cusdc: '164630000000000',
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usdc: '7878580000000000',
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usdt: '7864940000000000'
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}
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this.tokenAddresses
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this.oneUintAmount
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this.currencyLookup
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this.gasPrices = {
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fast: defaultGasPrice
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}
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const { tokenAddresses, oneUintAmount, currencyLookup } = getArgsForOracle()
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this.tokenAddresses = tokenAddresses
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this.oneUintAmount = oneUintAmount
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this.currencyLookup = currencyLookup
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}
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async fetchPrices() {
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try {
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let prices = await this.oracle.methods
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.getPricesInETH(this.tokenAddresses, this.oneUintAmount)
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.call()
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this.ethPrices = prices.reduce((acc, price, i) => {
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acc[this.currencyLookup[this.tokenAddresses[i]]] = price
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return acc
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}, {})
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setTimeout(() => this.fetchPrices(), 1000 * 30)
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} catch(e) {
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console.error('fetchPrices', e)
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setTimeout(() => this.fetchPrices(), 1000 * 30)
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}
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}
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async fetchGasPrice({ oracleIndex = 0 } = {}) {
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oracleIndex = (oracleIndex + 1) % gasOracleUrls.length
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const url = gasOracleUrls[oracleIndex]
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const delimiter = url === 'https://ethgasstation.info/json/ethgasAPI.json' ? 10 : 1
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try {
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const response = await fetch(url)
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if (response.status === 200) {
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const json = await response.json()
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if (Number(json.fast) === 0) {
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throw new Error('Fetch gasPrice failed')
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}
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if (json.fast) {
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this.gasPrices.fast = Number(json.fast) / delimiter
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}
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if (json.percentile_97) {
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this.gasPrices.fast = parseInt(json.percentile_90) + 1 / delimiter
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}
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// console.log('gas price fetch', this.gasPrices)
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} else {
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throw Error('Fetch gasPrice failed')
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}
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setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
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} catch (e) {
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setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
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}
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}
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async fetchNonce() {
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try {
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const nonce = await this.web3.eth.getTransactionCount(this.web3.eth.defaultAccount)
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await redisClient.set('nonce', nonce)
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console.log(`Current nonce: ${nonce}`)
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} catch(e) {
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console.error('fetchNonce failed', e.message)
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setTimeout(this.fetchNonce, 3000)
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}
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}
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}
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module.exports = Fetcher
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