Ben Barber benbarber

Note: This post is a summary of information paraphrased from an excellent blog post by Christian Sepulveda.

Prerequisites

Instructions

Create the app and download the necessary dependencies.

Installing Crystal on MacOS Sierra

I had a few issues getting the Crystal compiler to run on MacOS Sierra, these are the seteps I took to get it up and running.

Firstly install the Crystal Language through Homebrew;

brew install crystal-lang

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

Websockets behind AWS ELB

Nginx

See Configuring NGINX to accept the PROXY Protocol - NGINX

upstream wsserver {
    server 127.0.0.1:9000;
}

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	import { useLoaderData } from "@remix-run/react";
	import { useEffect } from "react";

	export const useStrictLoaderData = () => {
	const data = useLoaderData();
	const accessed = [] as String[];

	const getAllKeys = (obj: any, path = "") => {
	const keys = [] as String[];

	defmodule MyApp.Telemetry do
	require Logger

	def handle_event([:my_app, :repo, :query], measurements, metadata, _config) do
	milliseconds = System.convert_time_unit(measurements.total_time, :native, :millisecond)

	# did the query take longer than 100ms?
	if milliseconds > 100 do
	# log it as a warning
	Logger.warn("SLOW QUERY: ms: #{milliseconds}, query: #{metadata.query}")

	# Preloading usually required an extra query.
	# To do it in one query, a `join` is needed, and the call to `preload` needs to know the name of join
	# This macro does both the `join` and `preload` together
	defmodule Preloader do
	import Ecto, only: [assoc: 2]
	alias Ecto.Query.Builder.{Join, Preload}

	defmacro preload_join(query, association) do
	expr = quote do: assoc(l, unquote(association))
	binding = quote do: [l]

	const features = [
	'Map',
	'Set',
	'requestAnimationFrame'
	]

	function browserSupportsAllFeatures() {
	return features.every(f => window[f])
	}

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