mbenatti

defmodule EctoBatchStream do
  import Ecto.Query, only: [from: 1, from: 2]

  @batch_size 1000

  # Example:
  #
  #     query = from u in MyApp.User, select: u.email
  #     stream = EctoBatchStream.stream(MyApp.Repo, query)
  #     stream |> Stream.take(3) |> Enum.to_list # => […]

mbenatti

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

mbenatti

There are certain files created by particular editors, IDEs, operating systems, etc., that do not belong in a repository. But adding system-specific files to the repo's .gitignore is considered a poor practice. This file should only exclude files and directories that are a part of the package that should not be versioned (such as the node_modules directory) as well as files that are generated (and regenerated) as artifacts of a build process.

All other files should be in your own global gitignore file. Create a file called .gitignore in your home directory and add anything you want to ignore. You then need to tell git where your global gitignore file is.

Mac

git config --global core.excludesfile ~/.gitignore

Windows

git config --global core.excludesfile %USERPROFILE%\.gitignore

mbenatti

defmodule Game do
  use GenServer

  def init(game_id) do
    {:ok, %{game_id: game_id}}
  end

  def start_link(game_id) do
    GenServer.start_link(__MODULE__, game_id, name: {:global, "game:#{game_id}"})
  end

mbenatti

defmodule ListFlatten do
  def flatten(list), do: flatten(list, []) |> Enum.reverse
  def flatten([h | t], acc) when h == [], do: flatten(t, acc)
  def flatten([h | t], acc) when is_list(h), do: flatten(t, flatten(h, acc))
  def flatten([h | t], acc), do: flatten(t, [h | acc])
  def flatten([], acc), do: acc
end

list_1 = [[1,2,[3]],4]
list_2 = [[1,5,[3]],4,[[[1,2,[3]],4]]]

mbenatti

Build Server

• Go to Digital Ocean
• Create new droplet
• London
• Ubuntu
• No apps
• Add SSH keys

mbenatti

# This demonstrates that, when using async/await, a crash in the task will crash the caller
defmodule Tasker do
  def good(message) do
    IO.puts message
  end

  def bad(message) do
    IO.puts message
    raise "I'm BAD!"
  end

mbenatti

cd /app/
wget http://www.freedesktop.org/software/fontconfig/release/fontconfig-2.10.91.tar.gz
cd fontconfig-2.10.91
tar -xzf fontconfig-2.10.91.tar.gz
./configure
make

cd /app/
wget http://poppler.freedesktop.org/poppler-0.22.1.tar.gz
tar -xzf poppler-0.22.1.tar.gz

mbenatti

#!/bin/bash +x

# Source: http://www.gabsoftware.com/tips/automatically-reconnect-to-your-vpn-on-linux/

# Description:
# Make the script executable "chmod +x /path/to/the/script.sh
# Put the script in .profile or .bashrc so it can be run on user login:
# Example: echo "/path/to/the/script.sh start &" >> .bashrc
# The script can be bound to shortcut keys with these commands:
#   /path/to/the/script.sh start # starts and monitors VPN connection

mbenatti

# install dependencies
sudo apt-get update
sudo apt-get install -y build-essential
sudo apt-get install -y cmake
sudo apt-get install -y libgtk2.0-dev
sudo apt-get install -y pkg-config
sudo apt-get install -y python-numpy python-dev
sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install -y libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev