use async-hook instead of continuation-local-storage

NodeBB_src_middleware_cls2.js

var asyncHook = require('async-hook');

var path = require('path');
var utils = require('../../public/src/utils');

function CLS() {
	var mem = {};
	var self = this;
	this.storage = null;

	asyncHook.addHooks({
		init: function (id, handle, provider, parentUid, parentHandle) {
			mem[id] = self.storage;
		},
		pre: function (id, handle) {
			self.storage = mem[id];
		},
		post: function (id, handle) {
			self.storage = null;
		},
		destroy: function (id) {
			delete mem[id];
		}
	});
	asyncHook.enable();
}

CLS.prototype.domain = function (cb) {
	var self = this;

	process.nextTick(function () {
		self.storage = {};
		cb();
		self.storage = null;
	});
};

var cls = new CLS();

(function(ncls) {
	ncls.http = function (req, res, next) {
		cls.domain(function() {
			ncls.set('request', req);
			next && next();
		});
	};

	ncls.socket = function (socket, payload, event, next) {
		cls.domain(function() {
			ncls.set('request', utils.reqFromSocket(socket, payload, event));
			next && next();
		});
	};

	ncls.get = function (key) {
		return cls.storage && cls.storage[key];
	};

	ncls.set = function (key, value) {
		if (cls.storage) {
			cls.storage[key] = value;
		}
	};

	ncls.setItem = ncls.set;
	ncls.setItem = ncls.set;

})(exports);