keathley

defprotocol Functor do
  def fmap(data, func)
end

defprotocol Applicative do
  def pure(data)
  def run(wrapped_func, data)
end

defprotocol Monad do

smaximov

Background: это было написано для "фронт-энд" сервиса, который должен был проксировать HTTP и WebSocket-запросы на несколько внутренних сервисов.

Для того, чтобы переопределить то, как Phoenix обрабатывает вебсокеты, надо поменять настройки HTTP сервера (Cowboy), а именно настройки роутинга (:dispatch) — см. config.exs. Тут мы указываем, что для любого хоста: а) для пути "/aaa/websocket" вызывается хендлер API.Gateway.WSReverseProxy, б) для любого другого пути вызывается дефолтный хэндлер Phoenix.

API.Gateway.WSReverseProxy — это хэндлер Cowboy, для подробной информации о р

ostinelli

Erlang Release init.d script

If you have packaged your application into a release generated with Rebar, you might want to have the following:

• The release started on system boot.
• The VM monitored and restarted it if it crashes.

Use HEART

HEART is the Heartbeat Monitoring of an Erlang Runtime System. The purpose of the heart port program is to check that the Erlang runtime system it is supervising is still running, so that if the VM crashes or becomes unresponsive, it is restarted.

henrik

# TODO:
# Runner like https://github.com/elixir-lang/ecto/blob/master/lib/ecto/migration.ex (does it have state?)

defmodule Ecto.Runner do
  def start_command({:create, table}) do
    IO.puts "create table: #{table}"
  end

  def subcommand({:add, column, type}) do
    IO.puts "add column: #{column}(#{type})"

henrik

defmodule HttpRequester do
  use GenServer

  def start_link(_) do
    GenServer.start_link(__MODULE__, nil, [])
  end

  def fetch(server, url) do
    # Don't use cast: http://blog.elixirsips.com/2014/07/16/errata-dont-use-cast-in-a-poolboy-transaction/
    timeout_ms = 10_000

juanpabloaj

require Logger

Logger.configure_backend(:console, format: "$time $metadata[$level] $levelpad$message\n")

# more colores in
# https://hexdocs.pm/elixir/1.12/IO.ANSI.html

Logger.info("colorful log line", ansi_color: :black)
Logger.info("colorful log line", ansi_color: :blue)
Logger.info("colorful log line", ansi_color: :cyan)

chenzhan

# List all tables:
select db_id, id, name, sum(rows) as mysum 
from stv_tbl_perm where db_id = 100546 
group by db_id, id, name order by mysum desc;

# list all running processes:
select pid, query from stv_recents where status = 'Running';

# describe table
select * from PG_TABLE_DEF where tablename='audit_trail';

ahmadshah

defmodule Randomizer do
  @moduledoc """
  Random string generator module.
  """
  
  @doc """
  Generate random string based on the given legth. It is also possible to generate certain type of randomise string using the options below:

  * :all - generate alphanumeric random string
  * :alpha - generate nom-numeric random string

kipcole9

defmodule Map.Helpers do
  @moduledoc """
  Functions to transform maps
  """

  @doc """
  Convert map string camelCase keys to underscore_keys
  """
  def underscore_keys(nil), do: nil

zabirauf

defmodule Expng do

  defstruct [:width, :height, :bit_depth, :color_type, :compression, :filter, :interlace, :chunks]

  def png_parse(<<
  0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A,
                 _length :: size(32),
                 "IHDR",
                 width :: size(32),
                 height :: size(32),