[Update/WIP] Update to Elixir 1.16.0

.gitignore

@@ -32,4 +32,6 @@ cassian-*.tar
 /.elixir_ls
 
 # For certificates
-/priv
+/priv
+
+.asdf-vars

.tool-versions

@@ -0,0 +1,2 @@
+elixir 1.16.0
+erlang 26.2.1

Dockerfile

@@ -0,0 +1,78 @@
+# Stage to build the correct version of dependecies:
+
+# * Elixir
+# * Erlang
+
+FROM alpine:3.19.0 AS builder
+
+RUN apk update && \
+    apk upgrade && \
+    apk add curl git unzip \
+    gcc autoconf automake ncurses-dev \
+    bash make g++ openssl-dev
+
+RUN adduser -gD builder --disabled-password
+
+# Building Erlang/Elixir
+
+WORKDIR /build
+
+COPY .tool-versions .
+
+RUN chown -R builder:builder /build
+
+USER builder
+
+RUN git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch v0.13.1;
+
+RUN /bin/bash -c 'echo -e "\n\n## Configure ASDF \n. $HOME/.asdf/asdf.sh" >> ~/.bashrc'
+
+RUN /bin/bash -c 'echo -e "\n\n## ASDF Bash Completion: \n. $HOME/.asdf/completions/asdf.bash" >> ~/.bashrc';
+
+ENV PATH="$PATH:/home/builder/.asdf/bin:/home/builder/.asdf/shims"
+
+RUN asdf plugin add elixir
+
+RUN asdf plugin add erlang
+
+RUN asdf install
+
+# Building the application
+
+RUN mix local.hex --force
+
+COPY mix.exs        .
+
+COPY mix.lock       .
+
+COPY config         ./config
+
+COPY lib            ./lib
+
+COPY .formatter.exs .
+
+RUN mix deps.get
+
+RUN mix deps.compile
+
+RUN mix release
+
+# Actual app stage
+
+FROM alpine:3.19.0 AS runtime
+
+RUN adduser -D runner --disabled-password
+
+RUN apk update
+
+RUN apk upgrade
+
+RUN apk add ffmpeg youtube-dl
+
+USER runner
+
+WORKDIR /app
+
+COPY --from=builder /build/_build/dev/rel/cassian /app/cassian
+
+CMD ["/app/cassian/bin/cassian", "start"]

README.md

@@ -9,7 +9,6 @@ A Discord bot for music written in Elixir.
 ## Table of contents
 
 - [About](#about)
-- [Note regarding Nostrum](#note-regarding-nostrum)
 - [Note regarding the web part](#note-regarding-the-web-part)
 - [System requirements](#system-requirements)
 - [Configuration](#configuration)
@@ -23,10 +22,6 @@ The bot is written in Elixir, a functional programming language based upon Erlan
 
 The Discord library is [Nostrum](https://github.com/Kraigie/nostrum), written in Elixir and supporting everything from events to voice channels.
 
-## Note regarding Nostrum
-
-As of now the Hex release of Nostrum `v0.4.6` is a bit buggy so the current version of this bot uses the nightly version of Nostrum.
-
 ## Note regarding the web part
 
 This is deprecated. It will be removed once a web app has been created because I don't want to add web functionality to the bot.
@@ -39,18 +34,20 @@ This bot needs `youtube-dl` and `ffmpeg` in order to play music. The path of the
 
 ### General bot requirements
 
-Of course as this is written in Elixir, you will need Elixir installed. This can be easily done on Debian-based distros:
+Of course as this is written in Elixir, you will need Elixir installed. This can be easily done with [asdf](https://asdf-vm.com/). After following the asdf [instructions](https://asdf-vm.com/guide/getting-started.html) one can start adding the required plugins for the runtimes:
 
 ```bash
-sudo apt-get install elixir
+asdf plugin add elixir
+asdf plugin add erlang
+asdf install
 ```
 
-After installing Elixir you should be able to see the version:
+After that you should be able to run `elixir -v`
 
 ```bash
-Erlang/OTP 23 [erts-11.1.7] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
+Erlang/OTP 26 [erts-14.2.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]
 
-Elixir 1.11.2 (compiled with Erlang/OTP 23)
+Elixir 1.16.0 (compiled with Erlang/OTP 24)
 ```
 
 Try to keep the Elixir version `1.11.2` and up.
@@ -62,10 +59,6 @@ To set the bot up-and-running you will need to set a couple of variables.
 Here's the basic configuration:
 
 ```elixir
-use Mix.Config
-config :porcelain,
-  driver: Porcelain.Driver.Basic
-
 config :nostrum,
   ffmpeg: System.get_env("FFMPEG_PATH") || "/usr/bin/ffmpeg",
   youtubedl: System.get_env("YTDL_PATH") || "/usr/bin/youtube-dl",

config/config.exs

@@ -1,11 +1,6 @@
-use Mix.Config
-
-config :porcelain,
-  driver: Porcelain.Driver.Basic
+import Config
 
 config :nostrum,
-  ffmpeg: System.get_env("FFMPEG_PATH") || "/usr/bin/ffmpeg",
-  youtubedl: System.get_env("YTDL_PATH") || "/usr/bin/youtube-dl",
   token: System.get_env("DISCORD_BOT_TOKEN"),
   num_shards: :auto
 

config/runtime.exs

@@ -0,0 +1,10 @@
+import Config
+
+config :nostrum,
+  token: System.fetch_env!("DISCORD_BOT_TOKEN"),
+  num_shards: :auto
+
+config :cassian,
+  web_enabled: System.fetch_env!("WEB_ENABLED"),
+  port: "4000",
+  force_ssl: System.fetch_env!("FORCE_SSL")

docker-compose.yml

@@ -0,0 +1,14 @@
+version: '3.0'
+
+services:
+  bot:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    name: cassian-bot
+    restart: always
+    environment:
+      DISCORD_BOT_TOKEN: $DISCORD_BOT_TOKEN
+      WEB_ENABLED: false
+      FORCE_SSL: false
+

lib/cassian.ex

@@ -6,27 +6,13 @@ defmodule Cassian do
 
   alias Nostrum.Cache.Me
 
-  @default_command_prefix Application.get_env(:cassian, :prefix)
-
   @doc """
   Get the avatar of the bot itself.
   """
   @spec get_own_avatar() :: String.t()
   def get_own_avatar,
     do: Cassian.Utils.user_avatar(Me.get())
 
-  @doc """
-  Get the command prefix of the bot from a server. if no server
-  is specific then the default prefix is taken.
-
-  Currently this works only with the preset one as database has not yet
-  been added.
-  """
-  @spec command_prefix!(server_id :: Nostrum.Struct.Guild.id() | nil) :: binary
-  def command_prefix!(_server_id \\ nil) do
-    @default_command_prefix
-  end
-
   @doc """
   Get the user name of bot account.
   """

lib/cassian/application.ex

@@ -12,15 +12,9 @@ defmodule Cassian.Application do
 
   @doc false
   def add_children() do
-    alias Cassian.Consumer
-
     children =
       [
-        %{
-          id: Consumer,
-          start: {Consumer, :start_link, []}
-        },
-        Cassian.Servers.SoundCloudToken
+        Cassian.Consumer,
       ] ++ web_child!()
 
     children

lib/cassian/behaviours/command.ex

@@ -7,12 +7,18 @@ defmodule Cassian.Behaviours.Command do
   @doc """
   The function which is called that does all of the stuff needed in the command.
   """
-  @callback execute(message :: Nostrum.Struct.Message.t(), args :: List.t()) :: :ok
+  @callback execute(interaction :: Nostrum.Struct.Interaction.t()) :: map()
+
+  @doc """
+  The definition as a Discord application command.
+  """
+  @callback application_command_definition() :: map()
 
   defmacro __using__(_) do
     quote do
-      defmacro handle_command(message, args), do: execute(message, args)
       @behaviour Cassian.Behaviours.Command
+      import Bitwise
+      alias Cassian.Utils.Embed, as: EmbedUtils
     end
   end
 end

lib/cassian/behaviours/source_service.ex

@@ -0,0 +1,17 @@
+defmodule Cassian.Behaviours.SourceService do 
+  @moduledoc """
+  The general service for a source of audio.
+  """
+
+  @doc """
+  Try to get metadata for a specific song if it's supported.
+  """
+  @callback song_metadata(url :: String.t()) :: {:ok, %Cassian.Structs.Metadata{}} | {:error, :not_found}
+
+  defmacro __using__(_) do
+    quote do
+      @behaviour Cassian.Behaviours.SourceService
+      alias Cassian.Structs.Metadata
+    end
+  end
+end

lib/cassian/commands/bot/help.ex

@@ -1,31 +1,30 @@
 defmodule Cassian.Commands.Bot.Help do
   use Cassian.Behaviours.Command
 
-  alias Cassian.Managers.MessageManager
-
   @moduledoc """
   The help command. Shows a menu of commands.
   """
+
+  def application_command_definition() do
+    %{
+      name: "help",
+      description: "Get the list of all commands from Cassian"
+    }
+  end
 
-  @doc false
-  def execute(message, _args) do
-    generate_help_embed!()
-    |> MessageManager.send_embed(message.channel_id)
-
-    :ok
+  def execute(_interaction) do
+    %{type: 4, data: %{embeds: [generate_help_embed!()], flags: 1 <<< 6}}
   end
 
   import Cassian.Utils.Embed
   alias Nostrum.Struct.Embed
 
-  def generate_help_embed!() do
+  defp generate_help_embed!() do
     create_empty_embed!()
     |> Embed.put_title("Yo! Thanks for adding me to the server!")
     |> Embed.put_description(
       "I currently don't have a propper help command as I'm a WIP. Though once it has been created it will be linked here so " <>
-        "you can see all of my commands. Although you can start playing music with `#{
-          Cassian.command_prefix!()
-        }play`."
+        "you can see all of my commands. Although you can start playing music with `/play`."
     )
     |> Embed.put_thumbnail(Cassian.get_own_avatar())
   end

lib/cassian/commands/playback/backward.ex

@@ -6,8 +6,17 @@ defmodule Cassian.Commands.Playback.Backward do
   @doc """
   Play the playlist backwards.
   """
+
+  def application_command_definition() do
+    %{
+      name: "backward",
+      description: "Play the playlist backwards."
+    }
+  end
 
-  def execute(message, _args) do
-    PlayManager.change_direction_with_notification(message, true)
+  def execute(interaction) do
+    {embed, flags} = PlayManager.change_direction_with_notification(interaction, true)
+
+    %{type: 4, data: %{embeds: [embed], flags: flags}}
   end
 end

lib/cassian/commands/playback/forward.ex

@@ -6,8 +6,17 @@ defmodule Cassian.Commands.Playback.Forward do
   @doc """
   Play the playlist forward.
   """
+
+  def application_command_definition() do
+    %{
+      name: "forward",
+      description: "Play the playlist forward."
+    }
+  end
 
-  def execute(message, _args) do
-    PlayManager.change_direction_with_notification(message, false)
+  def execute(interaction) do
+    {embed, flags} = PlayManager.change_direction_with_notification(interaction, false)
+
+    %{type: 4, data: %{embeds: [embed], flags: flags}}
   end
 end