Add the --fd parameter.

.gitignore

@@ -5,3 +5,4 @@ lib-cov
 config/dev.json
 config/stage.json
 config/prod.json
+circus/*.log

Makefile

@@ -53,3 +53,7 @@ loadtests-check:
 	  sleep 1 && cd loadtests && \
 	  make test SERVER_URL=http://127.0.0.1:5000; \
 	  EXIT_CODE=$$?; kill $$PID; exit $$EXIT_CODE
+
+.PHONY: circus
+circus:
+	circusd circus/loop-server.ini

circus/loop-server.ini

@@ -0,0 +1,27 @@
+[circus]
+check_delay = 5
+endpoint = tcp://127.0.0.1:5555
+pubsub_endpoint = tcp://127.0.0.1:5556
+stats_endpoint = tcp://127.0.0.1:5557
+
+[plugin:flapping]
+use = circus.plugins.flapping.Flapping
+retry_in = 3
+max_retry = 2
+
+[watcher:loop]
+cmd = node loop/index.js --fd $(circus.sockets.loop)
+use_sockets = True
+warmup_delay = 0
+numprocesses = 2
+stop_children = true
+stop_signal = SIGINT
+stdout_stream.class = StdoutStream
+stderr_stream.class = StdoutStream
+
+[socket:loop]
+host = 127.0.0.1
+port = 5000
+
+[env:loop]
+NODE_ENV = dev

loop/index.js

@@ -106,12 +106,19 @@ pushServerConfig(app, conf);
 app.use(raven.middleware.express(conf.get('sentryDSN')));
 
 // Starts HTTP server.
+var argv = require('yargs').argv;
 var server = http.createServer(app);
-server.listen(conf.get('port'), conf.get('host'), function(){
-  console.log('Server listening on http://' +
-              conf.get('host') + ':' + conf.get('port'));
-});
 
+if (argv.hasOwnProperty("fd")) {
+  server.listen({fd: parseInt(argv.fd, 10)}, function() {
+    console.log("Server listening on fd://" + argv.fd);
+  });
+} else {
+  server.listen(conf.get('port'), conf.get('host'), function(){
+    console.log('Server listening on http://' +
+                conf.get('host') + ':' + conf.get('port'));
+  });
+}
 
 // Handle websockets.
 var ws = websockets(storage, logError, conf);

package.json

@@ -32,7 +32,8 @@
     "sodium": "1.0.11",
     "atob": "1.1.2",
     "express-hawkauth": "0.2.0",
-    "eslint": "0.7.x"
+    "eslint": "0.7.x",
+    "yargs": "1.3.1"
   },
   "devDependencies": {
     "chai": "1.9.x",