Rafael Turk rturk

AWS ELB with Node.js and WebSockets

This assumes that:

You are using Nginx.
You want to accept incoming connections on port 80.
Your Node.js app is listening on port 3000.
You want to be able to connect to your Node.js instance directly as well as via the load balancer.

####1. Create load balancer

Installing Cassandra on Mac OS X

Install Homebrew

Homebrew is a great little package manager for OS X. If you haven't already, installing it is pretty easy:

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

Validação para cartão de crédito.

Bin e padrões para validação de cartão de crédito.

Bandeira	Comeca com	Máximo de número	Máximo de número cvc
Visa	4	13,16	3
Mastercard	5	16	3
Diners	301,305,36,38	14,16	3

Removal of McAfee from OSX

Note: This was written in 2015, it may be out of date now.

There are a lot of commands here which I use sudo if you don't know what you're doing with sudo, especially where I rm you can severely screw up your system.

There are many reasons which you would want to remove a piece of software such as McAfee, such as not wanting it to hammer your CPU during work hours which seems like primetime for a virus scan.

I intend this to be a living document, I have included suggestions from peoples' replies.

I've developed a useful feature in KeystoneJS that lets you populate a relationship from either side, while only storing the data on one side, and am looking for feedback on whether it is something that could / should be brought back into mongoose itself. (It might be possible to add as a separate package but I suspect there'd be too much rewriting of mongoose internals for that to be a good idea).

I've added this as an issue in mongoose for consideration: #1888 but am leaving this gist in place because the examples are easier to read.

I've used Posts and Categories as a basic, contrived example to demonstrate what I'm talking about here; in reality you'd rarely load all the posts for a category but there are other real world cases where it's less unreasonable you'd want to do this, and Posts + Categories is an easy way to demo it.

The problem

The built-in population feature is really useful; not just for

	# Adapted from https://github.com/doobeh/Flask-S3-Uploader
	# Improved to store the data on the local server and process
	# the upload via a celery task queue

	from uuid import uuid4
	import boto
	import os.path
	from flask import current_app as app
	from werkzeug.utils import secure_filename
	from .. import celery

	console.log('Loading function');

	const https = require('https');
	const url = require('url');
	// to get the slack hook url, go into slack admin and create a new "Incoming Webhook" integration
	const slack_url = 'https://hooks.slack.com/services/...';
	const slack_req_opts = url.parse(slack_url);
	slack_req_opts.method = 'POST';
	slack_req_opts.headers = {'Content-Type': 'application/json'};

	var AWS = require('aws-sdk');

	AWS.config.update({
	accessKeyId: '{AWS_KEY}',
	secretAccessKey: '{AWS_SECRET}',
	region: '{SNS_REGION}'
	});

	var sns = new AWS.SNS();

	# post_loc.txt contains the json you want to post
	# -p means to POST it
	# -H adds an Auth header (could be Basic or Token)
	# -T sets the Content-Type
	# -c is concurrent clients
	# -n is the number of requests to run in the test

	ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/

	// === Arrays

	var [a, b] = [1, 2];
	console.log(a, b);
	//=> 1 2


	// Use from functions, only select from pattern
	var foo = () => [1, 2, 3];