Merge pull request #16 from Patreon/jrsun-cluster-support

use express-cluster for drop-in cluster support

package.json

@@ -20,6 +20,7 @@
     "canvas": "^1.6.2",
     "chance": "^1.0.4",
     "express": "^4.14.0",
+    "express-cluster": "0.0.4",
     "newrelic": "^1.35.1",
     "node-gyp": "^3.4.0",
     "sanitize-filename": "^1.6.1",

run.js

@@ -0,0 +1,13 @@
+const cluster = require('express-cluster');
+const app = require('./server.js');
+
+const activePort = process.env.PORT || 3000;
+
+cluster((worker) => {
+    app.listen(activePort, () => {
+        console.log('worker ' + worker.id + ' is listening on port ' + activePort);
+    });
+}, {
+    'respawn': true, // workers will restart on failure
+    'verbose': true, // logs what happens to console
+});

server.js

@@ -20,9 +20,8 @@ function composeImage(width, height, seed) {
     return canvas;
 };
 
-const app = express();
-
 const cacheTimeout = 60 * 60 * 24 * 30;
+const app = express();
 
 app.get('/healthcheck', (req, res) => {
     res.status(200).end();
@@ -40,6 +39,4 @@ app.get('/:width/:seed', (req, res) => {
     res.end(buffer, 'binary');
 });
 
-app.listen(process.env.PORT || 3000, () => {
-    console.log('listening on http://localhost:3000');
-});
+module.exports = app;