feat: add emqx_config_helper

apps/emqx_config_helper/.formatter.exs

@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

apps/emqx_config_helper/.gitignore

@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+emqx_config_helper-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

apps/emqx_config_helper/README.md

@@ -0,0 +1,21 @@
+# EmqxConfigHelper
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `emqx_config_helper` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:emqx_config_helper, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/emqx_config_helper](https://hexdocs.pm/emqx_config_helper).
+

apps/emqx_config_helper/lib/emqx_config_helper.ex

@@ -0,0 +1,2 @@
+defmodule EmqxConfigHelper do
+end

apps/emqx_config_helper/lib/emqx_config_helper/hocon.ex

@@ -0,0 +1,35 @@
+defmodule EmqxConfigHelper.Hocon do
+  def hocon(_application, options) do
+    {:ok, config} =
+      options
+      |> Keyword.fetch!(:config_file)
+      |> List.wrap()
+      |> Enum.map(&to_charlist/1)
+      |> :hocon.files(%{format: :richmap})
+
+    options
+    |> Keyword.fetch!(:schema_module)
+    |> :hocon_schema.check(config, %{atom_key: true, return_plain: true})
+    |> IO.inspect
+    |> Enum.each(fn {application, envs} ->
+      Config.config(application, Enum.to_list(envs))
+    end)
+  end
+end
+
+defmodule EmqxConfigHelper.Cuttlefish do
+  def cuttlefish(application, options) do
+    config =
+      options
+      |> Keyword.fetch!(:config_file)
+      |> :cuttlefish_conf.file()
+
+    application
+    |> :code.priv_dir()
+    |> Path.join("#{application}.schema")
+    |> List.wrap()
+    |> :cuttlefish_schema.files()
+    |> :cuttlefish_generator.map(config)
+    |> Enum.each(fn {application, envs} -> Config.config(application, envs) end)
+  end
+end

apps/emqx_config_helper/mix.exs

@@ -0,0 +1,30 @@
+defmodule EmqxConfigHelper.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :emqx_config_helper,
+      version: "0.1.0",
+      build_path: "../../_build",
+      config_path: "../../config/config.exs",
+      deps_path: "../../deps",
+      lockfile: "../../mix.lock",
+      elixir: "~> 1.12",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:cuttlefish, github: "emqx/cuttlefish", tag: "v4.0.1"},
+      {:hocon, github: "emqx/hocon"}
+    ]
+  end
+end

apps/emqx_config_helper/test/emqx_config_helper_test.exs

@@ -0,0 +1,8 @@
+defmodule EmqxConfigHelperTest do
+  use ExUnit.Case
+  doctest EmqxConfigHelper
+
+  test "greets the world" do
+    assert EmqxConfigHelper.hello() == :world
+  end
+end

apps/emqx_config_helper/test/test_helper.exs

@@ -0,0 +1 @@
+ExUnit.start()

apps/emqx_release_helper/lib/emqx_release_helper/applications.ex

@@ -100,6 +100,10 @@ defmodule EmqxReleaseHelper.Applications do
     overlay :plugin
   end
 
+  application :emqx_config_helper do
+    start_type :load
+  end
+
   application :emqx_exhook, %{release_type: :cloud} do
     start_type :load
     overlay :plugin

config/runtime.exs

@@ -1,5 +1,13 @@
 import Config
+import EmqxConfigHelper.Hocon
+import EmqxConfigHelper.Cuttlefish
 
-File.cwd! |> IO.inspect
+hocon :emqx_prometheus,
+  schema_module: :emqx_prometheus_schema,
+  config_file: "etc/plugins/emqx_prometheus.conf"
+
+cuttlefish :emqx_sn,
+  schema_file: "emqx_sn.schema",
+  config_file: "etc/plugins/emqx_sn.conf"
 
 config :mnesia, dir: '/tmp/mnesia'