IMaaS example

Using ImageMagick as a Service with arc_ecto in Elixir/Phoenix.

Here imagemagick is replaced with caas -- ImageMagick as a Service client. For this setup to work you need to run ImageMagick as a Service server and provide CONVERTER_URL for an application where caas is used.

For more information look at api/lib/imaas/images/image.ex and api/Dockerfile for using caas binary and at docker-compose.yml for configuring imaas server and the main application.

Code snippetes

docker-compose.yml

In main docker-compose file configure imaas application:

version: '3.7'
networks:
  internal:
    external: false
services:
  # ...
  api:
    # ...
    environment:
      CONVERTER_URL: http://imaas_imagemagick_1:4000
  imagemagick:
    image: yunmikun2/imaas:latest
    restart: unless-stopped
    networks:
      - internal

Dockerfile

Add the following line to the dockerfile of your api applicaion:

COPY --from=yunmikun2/caas:latest /bin/caas /bin

Arc image definition

In your arc image definition module define transform so that it uses caas instead default convert:

defmodule MyApp.Image do
  # ...
  use Arc.Definition
  # ...

  def transform(_, _) do
    {:caas, "-strip -thumbnail 100x100^ -gravity center"}
  end
end

Running

You most possibly need to replace onlyhome with localhost (or with the host you are gonna deploy it to) in .env. Also, you are gonna need docker-compose. Run 'docker-compose up --build -d' and then you can go to http://localhost:18081/posts and play a little.

Architecture

• api is a siple Elixir/Phoenix application that stores "posts" with images.

• web_client is a frontend for imaas (implemented as another Elixir/Phoenix application, yeah).