From 48ac70c0b80582c627c4cc3f90836f840aea2a09 Mon Sep 17 00:00:00 2001
From: James Willcox <snorp@snorp.net>
Date: Mon, 16 Jun 2014 23:19:14 -0500
Subject: [PATCH 1/2] Add clustering, enable by default in production mode

---
 config/default.yml    | 13 +++++++++
 config/production.yml |  3 ++
 lib/index.js          | 67 +++++++++++++++++++++++++++++++------------
 3 files changed, 64 insertions(+), 19 deletions(-)

diff --git a/config/default.yml b/config/default.yml
index 162564d..f632e56 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -4,6 +4,19 @@ logging:
   # (via Winston, https://github.com/flatiron/winston)
   level: debug
 
+# Node Cluster options
+cluster:
+  enabled: false
+  workers:
+    # When true (the default), the number of workers
+    # is determined automatically based on number
+    # of CPUs on the machine.
+    auto: true
+
+    # When 'auto' is false, this number is used to
+    # determine the number of workers.
+    count: 8
+
 # Gonzales server settings.
 proxy:
   # Gonzales listen port.
diff --git a/config/production.yml b/config/production.yml
index ab14738..7dca98b 100644
--- a/config/production.yml
+++ b/config/production.yml
@@ -1,2 +1,5 @@
 logging:
   level: error
+
+cluster:
+  enabled: true
diff --git a/lib/index.js b/lib/index.js
index 1ea061c..739b677 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,8 +1,11 @@
 'use strict';
 
 var log = require('./log');
+var cluster = require('cluster');
 
 var pkg = require('../package.json');
+var SpdyProxy = require('./proxy');
+var PacServer = require('./pac');
 
 var CONFIG = require('config');
 var GONZALES_NAME = 'Gonzales';
@@ -18,19 +21,21 @@ function showVersion() {
   console.log(GONZALES_TITLE);
 }
 
-// Process command-line arguments and return options path.
-(function processArgs() {
-  process.argv.forEach(function(value) {
-    if (value === '-h' || value === '--help') {
-      showHelp();
-      process.exit(1);
-    }
-    if (value === '-v' || value === '--version') {
-      showVersion();
-      process.exit(1);
-    }
-  });
-})();
+if (cluster.isMaster) {
+  // Process command-line arguments and return options path.
+  (function processArgs() {
+    process.argv.forEach(function(value) {
+      if (value === '-h' || value === '--help') {
+        showHelp();
+        process.exit(1);
+      }
+      if (value === '-v' || value === '--version') {
+        showVersion();
+        process.exit(1);
+      }
+    });
+  })();
+}
 
 function addVersionConfig() {
   CONFIG.version = pkg.version;
@@ -44,10 +49,34 @@ CONFIG.getConfigSources().forEach(function(config) {
   log.debug('Using configuration %s', config.name);
 });
 
-var SpdyProxy = require('./proxy');
-var proxy = new SpdyProxy(CONFIG);
-proxy.listen(CONFIG.proxy.port);
+function getWorkerCount() {
+  if (!CONFIG.cluster.enabled) {
+    return 0;
+  }
 
-var PacServer = require('./pac');
-var pacServer = new PacServer(CONFIG);
-pacServer.listen(CONFIG.pac.port);
+  if (CONFIG.cluster.workers.auto) {
+    return require('os').cpus().length;
+  } else {
+    return CONFIG.cluster.workers.count;
+  }
+}
+
+if (CONFIG.cluster.enabled && cluster.isMaster) {
+  var count = getWorkerCount();
+  log.debug('starting %d workers', count);
+  for (var i = 0; i < count; ++i) {
+    cluster.fork();
+  }
+
+  cluster.on('exit', function(worker, code) {
+    log.debug('worker %d died, exit code %d',
+      worker.process.pid, code);
+    cluster.fork();
+  });
+} else {
+  var pacServer = new PacServer(CONFIG);
+  pacServer.listen(CONFIG.pac.port);
+
+  var proxy = new SpdyProxy(CONFIG);
+  proxy.listen(CONFIG.proxy.port);
+}

From 2f81eab2c70a03d49577e14ea40f6b35e0fb9388 Mon Sep 17 00:00:00 2001
From: James Willcox <snorp@snorp.net>
Date: Tue, 17 Jun 2014 11:02:54 -0500
Subject: [PATCH 2/2] Add cluster-enabled logging

---
 lib/log.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/log.js b/lib/log.js
index f2ec18f..d7e6e35 100644
--- a/lib/log.js
+++ b/lib/log.js
@@ -1,6 +1,10 @@
 'use strict';
 
 var winston = require('winston');
+var cluster = require('cluster');
+
+var label = cluster.isMaster ? 'Master ' + process.pid :
+  'Worker ' + cluster.worker.process.pid;
 
 var level = require('config').logging.level;
 
@@ -16,7 +20,7 @@ function createLogger(level, label) {
   });
 }
 
-var logger = createLogger(level);
+var logger = createLogger(level, label);
 
 exports.log = logger.log.bind(logger);
 exports.debug = logger.debug.bind(logger);
@@ -24,7 +28,7 @@ exports.info = logger.info.bind(logger);
 exports.warn = logger.warn.bind(logger);
 exports.error = logger.error.bind(logger);
 
-exports.logify = function(obj, label) {
-  var objectLogger = createLogger(level, label);
+exports.logify = function(obj, objectLabel) {
+  var objectLogger = createLogger(level, label + ', ' + objectLabel);
   objectLogger.extend(obj);
 };