devin ivy devinivy

`any.describe()`

Returns a plain object representing the schema's rules and properties. May contain the following keys:

type - the base type of the schema object
flags - properties that affect the behavior of a validation, e.g. insensitive
description - data set by .description()
- multiple calls to .description() will overwrite previous data
notes - array of data set by .notes()
tags - array of data set by .tags()
meta - array of data set by .meta()

Flamegraphs for your node processes on OS X

This document will help you generate flamegraphs for your node processes on OS X.

You can read about the various types of flamegraphs and how they are useful
in Brendan Gregg's wonderful write up here.

By the end of this document, you should have a flamegraph for you node app to play with.

Composition

On an architectural level, the way we craft large-scale applications in JavaScript has changed in at least one fundamental way in the last four years. Once you remove the minutia of machinery bringing forth data-binding, immutable data-structures and virtual-DOM (all of which are interesting problem spaces) the one key concept that many devs seem to have organically converged on is composition. Composition is incredibly powerful, allowing us to stitch together reusable pieces of functionality to "compose" a larger application. Composition eschews in a mindset of things being good when they're modular, smaller and easier to test. Easier to reason with. Easier to distribute. Heck, just look at how well that works for Node.

Composition is one of the reasons we regularly talk about React "Components", "Ember.Component"s, Angular directives, Polymer elements and of course, straight-up Web Components. We may argue about the frameworks and libraries surrounding t

Anivia

Anivia is Walmart's mobile analytics platform. It collects user-interaction metrics from mobile devices -- iPhone, iPad, Android, and mWeb. It also processes logging and other metrics from a bunch of mobile services. Anivia allows the business to have real-time insight and reporting into what is going on in the mobile business and provides vital capabilities for developers and ops folks to monitor the health of their services.

Anivia is built on Node.js, Hapi, RabbitMQ, and a multitude of downstream systems including Splunk and Omniture. Anivia is taking in 7,000 events per second on average (as of this writing), which after some fan-out and demuxing comes out to around 20,000 messages per second in flight. These rates are expected to soar leading up to and including Black Friday. The platform has grown in recent months to over 1,000 node processes spanning multiple data centers, gaining features such as link resiliency in the process.

A few of Anivia's functionalities

__Timestamp Correc

Mobile Server Side Rendering

This year marks the first year that we are doing full scale rendering of our SPA application on our mobile.walmart.com Node.js tier, which has provided a number of challenges that are very different from the mostly IO-bound load of our prior #nodebf.

The infrastructure outlined for last year is the same but our Home, Item and a few other pages are prerendered on the server using fruit-loops and hula-hoop to execute an optimized version of our client-side JavaScript and provide a SEO and first-load friendly version of the site.

To support the additional CPU load concerns as peak, which we hope will be unfounded or mitigated by our work, we have also taken a variety of steps to increase cache lifetimes of the pages that are being served in this manner. In order of their impact:

Event Loop Management

##Install AWS CLI Tools##

Install AWS CLI Tools. You can also use the EC2 API Tool if you are more comfortable with them. But this write-up uses the EC2 CLI.
Create a user via Amazon IAM or download the security accessID and securitykey you will need it to query Amazon CLI.
using Terminal cd into .aws directory cd ~/.aws edit or create new file named config paste the following contents inside.
`[default]`

`aws_access_key_id = ACCESS_ID`

`aws_secret_access_key = SECRET_ID`

`output = json OR bson OR text`

`region = PREFERRED_AWS_REGION`

Save the file as "config"

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

	User.find(id).populate('preferences').exec(function (err, user) {
	if(err) {
	sails.log.error("ERR:", err);
	}
	sails.services['util'].populateDeep('user', user[0], 'preferences.nestedPreferences', function (err, newUser) {
	if (err) {
	sails.log.error("ERR:", err);
	}
	console.log(newUser);
	});

	export PKG_CONFIG_PATH=/usr/lib64/pkgconfig:/usr/lib/pkgconfig
	export PATH=/usr/bin:$PATH
	export LDFLAGS=-L/usr/lib64:/usr/lib
	export LD_LIBRARY_PATH=/usr/lib64:/usr/lib
	export CPPFLAGS=-I/usr/include

	sudo yum-config-manager --enable epel
	#sudo yum update -y
	sudo yum install -y gcc gcc-c++ glib2-devel.x86_64 libxml2-devel.x86_64 libpng-devel.x86_64 \
	libjpeg-turbo-devel.x86_64 gobject-introspection.x86_64 gobject-introspection-devel.x86_64

	console.log("\033[39mRunning tests…");
	function assertEquals(actual, expected, description) {
	if(typeof(actual) === "undefined") {
	console.error("\033[31m" + description + " not implemented\033[39m");
	} else {
	if(actual !== expected) {
	console.error("\033[31m" + description + " failed, expected " + expected + ", got " + actual + "\033[39m");
	} else {
	console.log(description + " \033[32m ok\033[39m");
	}