Gigalixir Cloud for Oban Auto Scaling

gigalixir.ex

defmodule Oban.Pro.Clouds.Gigalixir do
  @moduledoc """
  Cloud scaler for Gigalixir.

  ## Usage

  ```elixir
  alias Oban.Pro.DynamicScaler
  alias Oban.Pro.Clouds.Gigalixir

  cloud_opts = [
    api_key: "API KEY",
    app_name: "APP NAME",
    email: "AUTH EMAIL"
  ]

  plugins: [
    {DynamicScaler, scalers: [range: 1..3, cloud: {Gigalixir, cloud_opts}]}
  ]
  ```
  """

  @behaviour Oban.Pro.Cloud

  defstruct [:api_key, :app, :email]

  @impl Oban.Pro.Cloud
  def init(opts) do
    struct!(__MODULE__, opts)
  end

  @impl Oban.Pro.Cloud
  def scale(quantity, %{api_key: api_key, app_name: app_name, email: email}) do
    Req.put!("https://api.gigalixir.com/api/apps/#{app_name}/scale",
      auth: {:basic, "#{email}:#{api_key}"},
      json: %{replicas: quantity},
      headers: [{"content-type", "application/json"}]
    )
  end
end