Merge pull request #4 from tornadocash/oracleFix

Fixes

README.md

@@ -1,22 +1,23 @@
 # Relayer for Tornado mixer [![Build Status](https://travis-ci.org/tornadocash/relayer.svg?branch=master)](https://travis-ci.org/tornadocash/relayer) [![Docker Cloud Build Status](https://img.shields.io/docker/cloud/build/tornadocash/relayer.svg)](https://hub.docker.com/r/tornadocash/relayer/builds)
 
-## Setup
+## Run locally
 1. `npm i`
 2. `cp .env.example .env`
 3. Modify `.env` as needed
-4. If you want to change contracts' addresses go to [config.js](./config.js) file.
-
-## Deploy Kovan
-1. `cp .env.example deploy/kovan/.env`
-2. `cd deploy/kovan`
-2. Modify `.env` as needed
-3. `docker-compose -p kovan up -d`
-
-## Run locally
-1. `npm run start`
-2. `curl -X POST -H 'content-type:application/json' --data '<input data>' http://127.0.0.1:8000/relay`
+4. `npm run start`
+5. Go to `http://127.0.0.1:8000`
+6. In order to execute withdraw request, you can run following command 
+```bash
+curl -X POST -H 'content-type:application/json' --data '<input data>' http://127.0.0.1:8000/relay
+```
 Relayer should return a transaction hash.
 
+*Note.* If you want to change contracts' addresses go to [config.js](./config.js) file.
+
+## Deploy as a Docker container
+1. `cp .env.example .env`
+2. Modify `.env` as needed
+3. `docker run -d --env-file .env -p 80:8000 tornadocash/relayer`
 
 ## Input data example
 ```json

app.js

@@ -0,0 +1 @@
+module.exports = require('./src/index')

config.js

@@ -50,7 +50,7 @@ module.exports = {
     }
   },
   defaultGasPrice: 2,
-  gasOracleUrls: ['https://www.etherchain.org/api/gasPriceOracle', 'https://gasprice.poa.network/'],
+  gasOracleUrls: ['https://ethgasstation.info/json/ethgasAPI.json', 'https://gasprice.poa.network/'],
   port: process.env.APP_PORT,
   relayerServiceFee: Number(process.env.RELAYER_FEE)
 }

deploy/kovan/docker-compose.yml

@@ -1,18 +0,0 @@
-version: '2.2'
-
-services:
-  relayer:
-    build: ../../
-    restart: always
-    environment:
-      NODE_ENV: production
-      VIRTUAL_HOST: kovan.tornado.cash
-      LETSENCRYPT_HOST: kovan.tornado.cash
-    env_file: ./.env
-    healthcheck:
-      test: curl -sS http://127.0.0.1:8000 || exit 1
-
-networks:
-  default:
-    external:
-      name: frontend_default

deploy/mainnet/docker-compose.yml

@@ -1,18 +0,0 @@
-version: '2.2'
-
-services:
-  relayer:
-    build: ../../
-    restart: always
-    environment:
-      NODE_ENV: production
-      VIRTUAL_HOST: mainnet.tornado.cash
-      LETSENCRYPT_HOST: mainnet.tornado.cash
-    env_file: ./.env
-    healthcheck:
-      test: curl -sS http://127.0.0.1:8000 || exit 1
-
-networks:
-  default:
-    external:
-      name: frontend_default

package.json

@@ -2,9 +2,9 @@
   "name": "relay",
   "version": "1.0.0",
   "description": "Relayer for Tornado mixer. https://tornado.cash",
-  "main": "src/index.js",
+  "main": "app.js",
   "scripts": {
-    "start": "node src/index.js",
+    "start": "node app.js",
     "eslint": "npx eslint --ignore-path .gitignore .",
     "test": "echo \"Error: no test specified\" && exit 1"
   },

src/Fetcher.js

@@ -38,22 +38,27 @@ class Fetcher {
   }
   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(gasOracleUrls[oracleIndex])
+      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.slow) {
-          this.gasPrices.low = Number(json.slow)
+          this.gasPrices.low = Number(json.slow) / delimiter
         }
         if (json.safeLow) {
-          this.gasPrices.low = Number(json.safeLow)
+          this.gasPrices.low = Number(json.safeLow) / delimiter
         }
         if (json.standard) {
-          this.gasPrices.standard = Number(json.standard)
+          this.gasPrices.standard = Number(json.standard) / delimiter
         }
         if (json.fast) {
-          this.gasPrices.fast = Number(json.fast)
+          this.gasPrices.fast = Number(json.fast) / delimiter
         }
       } else {
         throw Error('Fetch gasPrice failed')

src/index.js

@@ -25,7 +25,7 @@ app.use(function(req, res, next) {
 
 app.get('/', function (req, res) {
   // just for testing purposes
-  res.send('This is <a href=https://tornado.cash>tornado.cash</a> Relayer service. Check the /status for settings')
+  res.send('This is <a href=https://tornado.cash>tornado.cash</a> Relayer service. Check the <a href=/status>/status</a> for settings')
 })
 
 app.get('/status', function (req, res) {