tornado-relayer/utils.js

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2019-07-18 15:43:26 +03:00
const fetch = require('node-fetch')
const { isHexStrict } = require('web3-utils')
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const { gasOracleUrls } = require('./config')
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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)
}
}
function isValidProof(proof) {
// validator expects `websnarkUtils.toSolidityInput(proof)` output
if (!(proof.pi_a && proof.pi_b && proof.pi_c && proof.publicSignals)) {
return { valid: false, reason: 'One of inputs is empty. There must be pi_a, pi_b, pi_c and publicSignals' }
}
Object.keys(proof).forEach(key => {
if (!Array.isArray(proof[key])) {
return { valid: false, reason: `Corrupted ${key}` }
}
if (key === 'pi_b') {
if (!Array.isArray(proof[key][0]) || !Array.isArray(proof[key][1])) {
return { valid: false, reason: `Corrupted ${key}` }
}
}
})
if (proof.pi_a.length !== 2) {
return { valid: false, reason: 'Corrupted pi_a' }
}
if (proof.pi_b.length !== 2 || proof.pi_b[0].length !== 2 || proof.pi_b[1].length !== 2) {
return { valid: false, reason: 'Corrupted pi_b' }
}
if (proof.pi_c.length !== 2) {
return { valid: false, reason: 'Corrupted pi_c' }
}
if (proof.publicSignals.length !== 4) {
return { valid: false, reason: 'Corrupted publicSignals' }
}
for (let [key, input] of Object.entries(proof)) {
if (key === 'pi_b') {
input = input[0].concat(input[1])
}
for (let i = 0; i < input.length; i++ ) {
if (!isHexStrict(input[i]) || input[i].length !== 66) {
return { valid: false, reason: `Corrupted ${key}` }
}
}
}
return { valid: true }
}
module.exports = { fetchGasPrice, isValidProof }