refactor + coingecko

src/utils.js

@@ -0,0 +1,79 @@
+const { isHexStrict, toBN, toWei } = require('web3-utils')
+const { mixers } = require('../config')
+
+function isValidProof(proof) {
+  // validator expects `websnarkUtils.toSolidityInput(proof)` output
+
+  if (!(proof)) {
+    return { valid: false, reason: 'The proof is empty.' }
+  }
+
+  if (!isHexStrict(proof) || proof.length !== 2 + 2 * 8 * 32) {
+    return { valid: false, reason: 'Corrupted proof' }
+  }
+
+  return { valid: true }
+}
+
+function isValidArgs(args) {
+
+  if (!(args)) {
+    return { valid: false, reason: 'Args are empty' }
+  }
+
+  if (args.length !== 6) {
+    return { valid: false, reason: 'Length of args is lower than 6' }
+  }
+
+  for(let signal of args) {
+    if (!isHexStrict(signal)) {
+      return { valid: false, reason: `Corrupted signal ${signal}` }
+    }
+  }
+
+  if (args[0].length !== 66 ||
+      args[1].length !== 66 ||
+      args[2].length !== 42 ||
+      args[3].length !== 42 ||
+      args[4].length !== 66 ||
+      args[5].length !== 66) {
+    return { valid: false, reason: 'The length one of the signals is incorrect' }
+  }
+
+  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))
+}
+
+function isEnoughFee({ gas, gasPrices, currency, refund, ethPrices, fee }) {
+  const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(gas))
+  let desiredFee
+  switch (currency) {
+    case 'eth': {
+      desiredFee = expense
+      break
+    }
+    case 'dai': {
+      desiredFee = expense.add(refund).mul(toBN(ethPrices.dai)).div(toBN(10 ** 18))
+      break
+    }
+  }
+  console.log('desired fee', desiredFee)
+  if (fee.lt(desiredFee)) {
+    return { isEnough: false, reason: 'Not enough fee' }
+  } 
+  return { isEnough: true }
+}
+
+module.exports = { isValidProof, isValidArgs, sleep, isKnownContract, isEnoughFee }