Download traces lib

src/backend/apis/index.js

 import Promise from 'bluebird';
 import axios from 'axios';
+import fs from 'fs';
+import { githubClientId, githubClientSecret } from '/environment';
+
+axios.interceptors.request.use(request => {
+  request.params = { client_id: githubClientId, client_secret: githubClientSecret, ...request.params };
+  return request;
+});
 
 axios.interceptors.response.use(response => {
   return response.data;
@@ -54,9 +61,18 @@ const PATCH = URL => {
 };
 
 const GitHubApi = {
-  auth: (client_id, client_secret) => axios.defaults.params = { client_id, client_secret },
   listCommits: GET('/repos/:owner/:repo/commits'),
   getAccessToken: code => axios.post('https://github.com/login/oauth/access_token', { code }, { headers: { Accept: 'application/json' } }),
+  getLatestRelease: GET('/repos/:owner/:repo/releases/latest'),
+  download: (url, path) => axios({
+    method: 'get',
+    url,
+    responseType: 'stream',
+  }).then(data => new Promise((resolve, reject) => {
+    data.pipe(fs.createWriteStream(path));
+    data.on('end', resolve);
+    data.on('error', reject);
+  })),
 };
 
 export {

src/backend/controllers/compilers.js

+import Promise from 'bluebird';
 import express from 'express';
 import path from 'path';
+import { GitHubApi } from '/apis';
 
 const router = express.Router();
 
+const getPath = (...args) => path.resolve(__dirname, '..', 'public', 'libs', ...args);
+
+const downloadLibs = () => {
+  GitHubApi.getLatestRelease('algorithm-visualizer', 'tracers').then(release => {
+    return Promise.each(release.assets, asset => GitHubApi.download(asset.browser_download_url, getPath(asset.name)));
+  });
+};
+downloadLibs(); // TODO: download again when webhooked
+
 const getJsWorker = (req, res, next) => {
   res.sendFile(path.resolve(__dirname, '..', 'tracers', 'languages', 'js', 'build', 'index.js'));
 };

src/backend/index.js

@@ -4,10 +4,7 @@ import cookieParser from 'cookie-parser';
 import bodyParser from 'body-parser';
 import * as controllers from '/controllers';
 import { AuthorizationError, NotFoundError, PermissionError } from '/common/error';
-import { GitHubApi } from '/apis';
-import { githubClientId, githubClientSecret } from '/environment';
 
-GitHubApi.auth(githubClientId, githubClientSecret);
 const app = express();
 app.use(morgan('tiny'));
 app.use(cookieParser());