James Holcomb jamesholcomb

Run NodeJS as a Service on Ubuntu 14.04 LTS

With Node you can write very fast JavaScript programs serverside. It's pretty easy to install Node, code your program, and run it. But > how do you make it run nicely in the background like a true server?

Go to /etc/init/
$ sudo vim yourapp.conf
Paste script.conf
$ sudo start yourapp
And when you wanna kill the process $ sudo stop yourapp

ZeroMQ vs Redis

This document is research for the selection of a communication platform for robot-net.

Goal

The purpose of this component is to enable rapid, reliable, and elegant communication between the various nodes of the network, including controllers, sensors, and actuators (robot drivers). It will act as the core of robot-net to create a standardized infrastructure for robot control.

Requirements:

Include Weather Icons in your app: https://github.com/erikflowers/weather-icons
Include the below JSON in your application, for example purposes, lets assume it's a global named weatherIcons.
Make a request to OpenWeatherMap:

req = $.getJSON('http://api.openweathermap.org/data/2.5/weather?q=London,uk&callback=?');

Simple implementation of debounced fetching in GraphQL to allow merging of multiple rest / database requests into one. Although this example uses GraphQL, the debouncedFetch / fetchProgramPlaycount implementations could probably be used in any context to achieve the same result.

This approach was first described by @leebyron at graphql/graphql-js#19 (comment)

For example this allows turning ten requests for playcounts from this GraphQL query into just one:

{
  latestPrograms(first: 10) {
    name,

playcount

	### host file under sites-available ###


	# The upstream module is the link between Node.js and Nginx.
	# Upstream is used for proxying requests to other servers.
	# All requests for / get distributed between any of the servers listed.
	upstream app_nodeapp1 {

	# Set up multiple Node.js webservers for Load balancing.
	# max_fails refers to number of failed attempts

	/*
	builder.RegisterAssemblyTypes(new[] {Assembly.GetExecutingAssembly()})
	.Where(type => type.IsAssignableFrom(typeof (IQueryHandler<,>)))
	.AsImplementedInterfaces();
	*/

	public class Mediator : IMediator
	{
	private readonly ILifetimeScope lifetimeScope;

	function test() {
	var results = [];
	results.push(compareSemver("1.8.3", "1.8.3", "=="));
	results.push(compareSemver("1.9.1", "1.11.1", "<"));
	results.push(compareSemver("1.5.3", "1.9", "<"));
	results.push(compareSemver("1.3.2", "1.10.2", "<="));
	results.push(compareSemver("1.3.2", "1.3.2", "<="));
	results.push(compareSemver("1.11.1", "1.9.1", ">"));
	results.push(compareSemver("1.11.1", "1.11.0", ">"));
	results.push(compareSemver("1.10.2", "1.5.2", ">="));

	[
	{
	"city": "New York",
	"growth_from_2000_to_2013": "4.8%",
	"latitude": 40.7127837,
	"longitude": -74.0059413,
	"population": "8405837",
	"rank": "1",
	"state": "New York"
	},

	#!/bin/bash
	TARGET="mysite.example.net";
	RECIPIENT="[email protected]";
	DAYS=7;
	echo "checking if $TARGET expires in less than $DAYS days";
	expirationdate=$(date -d "$(: \| openssl s_client -connect $TARGET:443 -servername $TARGET 2>/dev/null \
	\| openssl x509 -text \
	\| grep 'Not After' \
	\|awk '{print $4,$5,$7}')" '+%s');
	in7days=$(($(date +%s) + (86400*$DAYS)));

	git branch -m old_branch new_branch # Rename branch locally
	git push origin :old_branch # Delete the old branch
	git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote