77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
const CoinGecko = require('coingecko-api')
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const fetch = require('node-fetch')
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const { toWei } = require('web3-utils')
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const { gasOracleUrls, defaultGasPrice } = require('../config')
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const { getMainnetTokens } = require('./utils')
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const config = require ('../config')
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class Fetcher {
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constructor(web3) {
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this.web3 = web3
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this.ethPrices = {
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dai: '6700000000000000' // 0.0067
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}
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this.gasPrices = {
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fast: defaultGasPrice
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}
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}
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async fetchPrices() {
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const { tokenAddresses, currencyLookup } = getMainnetTokens()
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try {
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const CoinGeckoClient = new CoinGecko()
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const price = await CoinGeckoClient.simple.fetchTokenPrice({
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contract_addresses: tokenAddresses,
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vs_currencies: 'eth',
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assetPlatform: 'ethereum'
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})
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this.ethPrices = Object.entries(price.data).reduce((acc, token) => {
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if (token[1].eth) {
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acc[currencyLookup[token[0]]] = toWei(token[1].eth.toString())
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}
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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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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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try {
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const response = await fetch(gasOracleUrls[oracleIndex])
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if (response.status === 200) {
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const json = await response.json()
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if (json.slow) {
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this.gasPrices.low = Number(json.slow)
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}
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if (json.safeLow) {
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this.gasPrices.low = Number(json.safeLow)
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}
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if (json.standard) {
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this.gasPrices.standard = Number(json.standard)
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}
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if (json.fast) {
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this.gasPrices.fast = Number(json.fast)
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}
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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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config.nonce = await this.web3.eth.getTransactionCount(this.web3.eth.defaultAccount)
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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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