benbarber

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}")

benbarber

# 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]

benbarber

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

Prerequisites

• Create-React-App
• Yarn

Instructions

Create the app and download the necessary dependencies.

benbarber

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

benbarber

Websockets behind AWS ELB

Nginx

See Configuring NGINX to accept the PROXY Protocol - NGINX

upstream wsserver {
    server 127.0.0.1:9000;
}

benbarber

0815.ru
0wnd.net
0wnd.org
10minutemail.co.za
10minutemail.com
123-m.com
1fsdfdsfsdf.tk
1pad.de
20minutemail.com
21cn.com

benbarber

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

benbarber

Git Cheat Sheet

Visit my blog or connect with me on Twitter

Commands

Getting Started

git init

or

benbarber

defmodule MyApp.Scheduler do
  @moduledoc """
  Schedules a Mix task to be run at a given interval in milliseconds.

  ## Options

  - `:task`: The name of the Mix task to run.
  - `:args`: A list of arguments to pass to the Mix task's `run/1` function.
  - `:interval`: The time interval in millisconds to rerun the task.