update gas-price-oracle

.eslintrc.json

@@ -1,40 +1,50 @@
 {
-    "env": {
-        "node": true,
-        "browser": true,
-        "es6": true,
-        "mocha": true
-    },
-    "extends": "eslint:recommended",
-    "globals": {
-        "Atomics": "readonly",
-        "SharedArrayBuffer": "readonly"
-    },
-    "parserOptions": {
-        "ecmaVersion": 2018
-    },
-    "rules": {
-        "indent": [
-            "error",
-            2,
-            {"SwitchCase": 1}
-        ],
-        "linebreak-style": [
-            "error",
-            "unix"
-        ],
-        "quotes": [
-            "error",
-            "single"
-        ],
-        "semi": [
-            "error",
-            "never"
-        ],
-        "object-curly-spacing": [
-          "error",
-          "always"
-        ],
-        "require-await": "error"
-    }
+  "env": {
+    "node": true,
+    "browser": true,
+    "es6": true,
+    "mocha": true
+  },
+  "extends": "eslint:recommended",
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "rules": {
+    "indent": [
+      "error",
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "never"
+    ],
+    "object-curly-spacing": [
+      "error",
+      "always"
+    ],
+    "require-await": "error",
+    "space-before-function-paren": [
+      "error",
+      {
+        "anonymous": "always",
+        "named": "never",
+        "asyncArrow": "always"
+      }
+    ]
+  }
 }

config.js

@@ -1,7 +1,7 @@
 require('dotenv').config()
 
 module.exports = {
-  version: 2.7,
+  version: 2.8,
   netId: Number(process.env.NET_ID) || 42,
   redisUrl: process.env.REDIS_URL,
   rpcUrl: process.env.RPC_URL || 'https://kovan.infura.io/',
@@ -145,7 +145,6 @@ module.exports = {
     }
   },
   defaultGasPrice: 20,
-  gasOracleUrls: ['https://ethgasstation.info/json/ethgasAPI.json', 'https://gas-oracle.zoltu.io/'],
   port: process.env.APP_PORT,
   relayerServiceFee: Number(process.env.RELAYER_FEE),
   maxGasPrice: process.env.MAX_GAS_PRICE || 200,

package.json

@@ -1,7 +1,7 @@
 {
   "name": "relay",
   "version": "1.0.0",
-  "description": "Relayer for Tornado mixer. https://tornado.cash",
+  "description": "Relayer for Tornado.cash privacy solution. https://tornado.cash",
   "main": "app.js",
   "scripts": {
     "start": "node app.js",
@@ -14,6 +14,7 @@
     "bull": "^3.12.1",
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
+    "gas-price-oracle": "^0.1.4",
     "ioredis": "^4.14.1",
     "node-fetch": "^2.6.0",
     "web3": "^1.2.2",

src/Fetcher.js

@@ -1,6 +1,5 @@
-const fetch = require('node-fetch')
 const Web3 = require('web3')
-const { gasOracleUrls, defaultGasPrice, oracleRpcUrl, oracleAddress } = require('../config')
+const { defaultGasPrice, oracleRpcUrl, oracleAddress } = require('../config')
 const { getArgsForOracle } = require('./utils')
 const { redisClient } = require('./redis')
 const priceOracleABI = require('../abis/PriceOracle.abi.json')
@@ -39,46 +38,17 @@ class Fetcher {
         return acc
       }, {})
       setTimeout(() => this.fetchPrices(), 1000 * 30)
-    } catch(e) {
+    } catch (e) {
       console.error('fetchPrices', e.message)
       setTimeout(() => this.fetchPrices(), 1000 * 30)
     }
   }
-  async fetchGasPrice({ oracleIndex = 0 } = {}) {
-    oracleIndex = (oracleIndex + 1) % gasOracleUrls.length
-    const url = gasOracleUrls[oracleIndex]
-    const delimiter = url === 'https://ethgasstation.info/json/ethgasAPI.json' ? 10 : 1
-    try {
-      const response = await fetch(url)
-      if (response.status === 200) {
-        const json = await response.json()
-        if (Number(json.fast) === 0) {
-          throw new Error('Fetch gasPrice failed')
-        }
-
-        if (json.fast) {
-          this.gasPrices.fast = Number(json.fast) / delimiter
-        }
-
-        if (json.percentile_97) {
-          this.gasPrices.fast = parseInt(json.percentile_90) + 1 / delimiter
-        }
-        // console.log('gas price fetch', this.gasPrices)
-      } else {
-        throw Error('Fetch gasPrice failed')
-      }
-      setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
-    } catch (e) {
-      console.log('fetchGasPrice', e.message)
-      setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
-    }
-  }
   async fetchNonce() {
     try {
       const nonce = await this.web3.eth.getTransactionCount(this.web3.eth.defaultAccount)
       await redisClient.set('nonce', nonce)
       console.log(`Current nonce: ${nonce}`)
-    } catch(e) {
+    } catch (e) {
       console.error('fetchNonce failed', e.message)
       setTimeout(this.fetchNonce, 3000)
     }

src/index.js

@@ -10,7 +10,7 @@ const {
   maxGasPrice
 } = require('../config')
 const relayController = require('./relayController')
-const { fetcher, web3 } = require('./instances')
+const { fetcher, web3, gasPriceOracle } = require('./instances')
 const { getMixers } = require('./utils')
 const mixers = getMixers()
 const { redisClient } = require('./redis')
@@ -26,7 +26,7 @@ app.use((err, req, res, next) => {
   }
 })
 
-app.use(function(req, res, next) {
+app.use(function (req, res, next) {
   res.header('Access-Control-Allow-Origin', '*')
   res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
   next()
@@ -39,11 +39,11 @@ app.get('/', function (req, res) {
 
 app.get('/status', async function (req, res) {
   let nonce = await redisClient.get('nonce')
-  const { ethPrices, gasPrices } = fetcher
+  const { ethPrices } = fetcher
   res.json({
     relayerAddress: web3.eth.defaultAccount,
     mixers,
-    gasPrices,
+    gasPrices: await gasPriceOracle.gasPrices(),
     netId,
     ethPrices,
     relayerServiceFee,
@@ -57,30 +57,28 @@ app.post('/relay', relayController)
 let server = app.listen(port || 8000)
 server.setTimeout(600000)
 console.log('Gas price oracle started.')
-fetcher.fetchGasPrice()
 fetcher.fetchPrices()
 fetcher.fetchNonce()
 
 console.log('Relayer started on port', port || 8000)
 console.log(`relayerAddress: ${web3.eth.defaultAccount}`)
 console.log(`mixers: ${JSON.stringify(mixers)}`)
-console.log(`gasPrices: ${JSON.stringify(fetcher.gasPrices)}`)
 console.log(`netId: ${netId}`)
 console.log(`ethPrices: ${JSON.stringify(fetcher.ethPrices)}`)
 
 const { GAS_PRICE_BUMP_PERCENTAGE, ALLOWABLE_PENDING_TX_TIMEOUT, NONCE_WATCHER_INTERVAL, MAX_GAS_PRICE } = process.env
-if(!NONCE_WATCHER_INTERVAL) {
+if (!NONCE_WATCHER_INTERVAL) {
   console.log(`NONCE_WATCHER_INTERVAL is not set. Using default value ${watherInterval / 1000} sec`)
 }
 
-if(!GAS_PRICE_BUMP_PERCENTAGE) {
+if (!GAS_PRICE_BUMP_PERCENTAGE) {
   console.log(`GAS_PRICE_BUMP_PERCENTAGE is not set. Using default value ${gasBumpPercentage}%`)
 }
 
-if(!ALLOWABLE_PENDING_TX_TIMEOUT) {
+if (!ALLOWABLE_PENDING_TX_TIMEOUT) {
   console.log(`ALLOWABLE_PENDING_TX_TIMEOUT is not set. Using default value ${pendingTxTimeout / 1000} sec`)
 }
 
-if(!MAX_GAS_PRICE) {
+if (!MAX_GAS_PRICE) {
   console.log(`ALLOWABLE_PENDING_TX_TIMEOUT is not set. Using default value ${maxGasPrice} Gwei`)
 }

src/instances.js

@@ -1,11 +1,15 @@
+const { rpcUrl } = require('../config')
 const Fetcher = require('./Fetcher')
 const Sender = require('./sender')
+const { GasPriceOracle } = require('gas-price-oracle')
 const web3 = require('./setupWeb3')
 const fetcher = new Fetcher(web3)
 const sender = new Sender(web3)
+const gasPriceOracle = new GasPriceOracle({ defaultRpc: rpcUrl })
 
 module.exports = {
   fetcher,
   web3,
-  sender
+  sender,
+  gasPriceOracle
 }

src/relayController.js

@@ -7,7 +7,7 @@ const {
 const config = require('../config')
 const { redisClient, redisOpts } = require('./redis')
 
-const { web3, fetcher, sender } = require('./instances')
+const { web3, fetcher, sender, gasPriceOracle } = require('./instances')
 const withdrawQueue = new Queue('withdraw', redisOpts)
 
 const reponseCbs = {}
@@ -22,26 +22,26 @@ async function relayController(req, resp) {
   let requestJob
 
   const { proof, args, contract } = req.body
-  let { valid , reason } = isValidProof(proof)
+  let { valid, reason } = isValidProof(proof)
   if (!valid) {
     console.log('Proof is invalid:', reason)
     return resp.status(400).json({ error: 'Proof format is invalid' })
   }
 
-  ({ valid , reason } = isValidArgs(args))
+  ({ valid, reason } = isValidArgs(args))
   if (!valid) {
     console.log('Args are invalid:', reason)
     return resp.status(400).json({ error: 'Withdraw arguments are invalid' })
   }
 
   let currency, amount
-  ( { valid, currency, amount } = isKnownContract(contract))
+  ({ valid, currency, amount } = isKnownContract(contract))
   if (!valid) {
     console.log('Contract does not exist:', contract)
     return resp.status(400).json({ error: 'This relayer does not support the token' })
   }
 
-  const [ root, nullifierHash, recipient, relayer, fee, refund ] = [
+  const [root, nullifierHash, recipient, relayer, fee, refund] = [
     args[0],
     args[1],
     toChecksumAddress(args[2]),
@@ -65,9 +65,9 @@ async function relayController(req, resp) {
   reponseCbs[requestJob.id] = resp
 }
 
-withdrawQueue.process(async function(job, done){
+withdrawQueue.process(async function (job, done) {
   console.log(Date.now(), ' withdraw started', job.id)
-  const gasPrices = fetcher.gasPrices
+  const gasPrices = await gasPriceOracle.gasPrices()
   const { contract, nullifierHash, root, proof, args, refund, currency, amount, fee } = job.data
   console.log(JSON.stringify(job.data))
   // job.data contains the custom data passed when the job was created
@@ -128,7 +128,7 @@ withdrawQueue.process(async function(job, done){
       nonce
     }
     tx.date = Date.now()
-    await redisClient.set('tx:' + nonce, JSON.stringify(tx) )
+    await redisClient.set('tx:' + nonce, JSON.stringify(tx))
     nonce += 1
     await redisClient.set('nonce', nonce)
     sender.sendTx(tx, done)