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Hot code upgrades for Elixir applications running on Fly.io

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fly_deploy lib fly_deploy blue_green supervisor.ex
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lib/fly_deploy/blue_green/supervisor.ex 

defmodule FlyDeploy.BlueGreen.Supervisor do

  @moduledoc false

  # Supervises the PeerManager and Poller for blue-green mode.

  #

  # The PeerManager boots the user's app in a peer node.

  # The Poller watches S3 for new releases and tells PeerManager to upgrade.



  use Supervisor



  def start_link(opts) do

    Supervisor.start_link(__MODULE__, opts, name: __MODULE__)

  end



  @impl true

  def init(opts) do

    otp_app = Keyword.fetch!(opts, :otp_app)

    parent_children = Keyword.get(opts, :children, [])

    endpoint = Keyword.get(opts, :endpoint)

    poll_interval = Keyword.get(opts, :poll_interval, 1_000)

    shutdown_timeout = Keyword.get(opts, :shutdown_timeout)



    children =

      parent_children ++

        [

          {FlyDeploy.BlueGreen.PeerManager,

           otp_app: otp_app, endpoint: endpoint, shutdown_timeout: shutdown_timeout},

          {FlyDeploy.Poller, otp_app: otp_app, poll_interval: poll_interval, mode: :blue_green}

        ]



    Supervisor.init(children, strategy: :one_for_one)

  end

end