92 lines
2.8 KiB
JavaScript
92 lines
2.8 KiB
JavaScript
const fetch = require('node-fetch')
|
|
const { isHexStrict, hexToNumberString } = require('web3-utils')
|
|
const { gasOracleUrls, ethdaiAddress, mixers } = require('./config')
|
|
const oracleABI = require('./abis/ETHDAIOracle.json')
|
|
|
|
async function fetchGasPrice({ gasPrices, oracleIndex = 0 }) {
|
|
oracleIndex = (oracleIndex + 1) % gasOracleUrls.length
|
|
try {
|
|
const response = await fetch(gasOracleUrls[oracleIndex])
|
|
if (response.status === 200) {
|
|
const json = await response.json()
|
|
|
|
if (json.slow) {
|
|
gasPrices.low = Number(json.slow)
|
|
}
|
|
if (json.safeLow) {
|
|
gasPrices.low = Number(json.safeLow)
|
|
}
|
|
if (json.standard) {
|
|
gasPrices.standard = Number(json.standard)
|
|
}
|
|
if (json.fast) {
|
|
gasPrices.fast = Number(json.fast)
|
|
}
|
|
} else {
|
|
throw Error('Fetch gasPrice failed')
|
|
}
|
|
setTimeout(() => fetchGasPrice({ gasPrices, oracleIndex }), 15000)
|
|
} catch (e) {
|
|
setTimeout(() => fetchGasPrice({ gasPrices, oracleIndex }), 15000)
|
|
}
|
|
}
|
|
|
|
async function fetchDAIprice({ ethPriceInDai, web3 }) {
|
|
try {
|
|
const ethDaiInstance = web3.eth.Contract(oracleABI, ethdaiAddress)
|
|
const price = await ethDaiInstance.methods.getMedianPrice().call()
|
|
ethPriceInDai = hexToNumberString(price)
|
|
setTimeout(() => fetchDAIprice({ ethPriceInDai, web3 }), 1000 * 30)
|
|
} catch(e) {
|
|
setTimeout(() => fetchDAIprice({ ethPriceInDai, web3 }), 1000 * 30)
|
|
}
|
|
}
|
|
|
|
function isValidProof(data) {
|
|
// validator expects `websnarkUtils.toSolidityInput(proof)` output
|
|
|
|
if (!(data.proof && data.publicSignals)) {
|
|
return { valid: false, reason: 'One of inputs is empty. There must be proof and publicSignals' }
|
|
}
|
|
|
|
if (!isHexStrict(data.proof) || data.proof.length !== 2 + 2 * 8 * 32) {
|
|
return { valid: false, reason: 'Corrupted proof' }
|
|
}
|
|
|
|
if (data.publicSignals.length !== 6) {
|
|
return { valid: false, reason: 'Corrupted publicSignals' }
|
|
}
|
|
|
|
for(let signal of data.publicSignals) {
|
|
if (!isHexStrict(signal)) {
|
|
return { valid: false, reason: 'Corrupted publicSignals' }
|
|
}
|
|
}
|
|
|
|
if (data.publicSignals[0].length !== 66 ||
|
|
data.publicSignals[1].length !== 66 ||
|
|
data.publicSignals[2].length !== 42 ||
|
|
data.publicSignals[3].length !== 42 ||
|
|
data.publicSignals[4].length !== 66 ||
|
|
data.publicSignals[5].length !== 66) {
|
|
return { valid: false, reason: 'Corrupted publicSignals' }
|
|
}
|
|
|
|
return { valid: true }
|
|
}
|
|
|
|
function isKnownContract(contract) {
|
|
for (let i = 0; i < mixers.length; i++) {
|
|
if (mixers[i].address === contract) {
|
|
return { valid: true, currency: mixers[i].currency }
|
|
}
|
|
}
|
|
return { valid: false }
|
|
}
|
|
|
|
function sleep(ms) {
|
|
return new Promise(resolve => setTimeout(resolve, ms))
|
|
}
|
|
|
|
module.exports = { fetchGasPrice, isValidProof, sleep, fetchDAIprice, isKnownContract }
|