Add workers for history to leverage CPU intensive work loading

lib/workers/historyUpdater.js

@@ -0,0 +1,66 @@
+// external modules
+var async = require('async');
+
+// core
+var config = require("../config.js");
+var logger = require("../logger.js");
+var models = require("../models");
+
+process.on('message', function (data) {
+    if (!data || !data.msg || data.msg !== 'update history' || !data.caches) return process.exit();
+    var caches = data.caches;
+    async.each(Object.keys(caches), function (key, callback) {
+        var cache = caches[key];
+        if (config.debug) logger.info("history updater found dirty history: " + key);
+        var history = parseHistoryToArray(cache);
+        finishUpdateHistory(key, history, function (err, count) {
+            if (err) return callback(err, null);
+            if (!count) return callback(null, null);
+            process.send({
+                msg: 'check',
+                userid: key
+            });
+            return callback(null, null);
+        });
+    }, function (err) {
+        if (err) logger.error('history updater error', err);
+        process.exit();
+    });
+});
+
+function finishUpdateHistory(userid, history, callback) {
+    models.User.update({
+        history: JSON.stringify(history)
+    }, {
+        where: {
+            id: userid
+        }
+    }).then(function (count) {
+        return callback(null, count);
+    }).catch(function (err) {
+        return callback(err, null);
+    });
+}
+
+function parseHistoryToArray(history) {
+    var _history = [];
+    Object.keys(history).forEach(function (key) {
+        var item = history[key];
+        _history.push(item);
+    });
+    return _history;
+}
+
+function parseHistoryToObject(history) {
+    var _history = {};
+    for (var i = 0, l = history.length; i < l; i++) {
+        var item = history[i];
+        _history[item.id] = item;
+    }
+    return _history;
+}
+
+module.exports = {
+    parseHistoryToArray: parseHistoryToArray,
+    parseHistoryToObject: parseHistoryToObject
+};