TOML Config Provider

A config provider to read TOML configuration files that works with Elixir (1.9+) releases.

Note: If you are building releases with Distillery, you can use the config provider from the toml-elixir library.

Prerequisites

• Elixir >= 1.9

Installation

The package can be installed by adding toml_config to your list of dependencies in mix.exs:

def deps do
  [
    {:toml_config, "~> 0.1", only: :prod}
  ]
end

Usage

Update the release configuration in your mix.exs file:

You can either give a fully qualified pathname to the config file.

releases: [
  my_app: [
    config_providers: [
      {TomlConfigProvider, path: "/absolute/path/to/my/config.toml"}
    ],
    ...
  ]
]

Or you can read the config directory or path from a specified environment variable. Booting the application fails if the specified environment variable is undefined.

releases: [
  my_app: [
    config_providers: [
      {TomlConfigProvider,
       path: {:system, "RELEASE_CONFIG_DIR", "my_app.toml"}}
    ],
    ...
  ]
]

Or:

releases: [
  my_app: [
    config_providers: [
      {TomlConfigProvider, path: {:system, "RELEASE_CONFIG_PATH"}}
    ],
    ...
  ]
]

All config provider options except :path are forwarded to Toml.decode_file/2 from the toml-elixir library. Thus, you can also provide custom transforms.

config_providers: [
  {TomlConfigProvider,
   path: "path/to/my/config.toml",
   transforms: [UrlTransform, TupleTransform]}
]

Other Implementations

toml Config Provider

The toml package brings it's own config provider that unfortunately only works with distellery releases at the moment.

toml_config_provider

Unlike toml_config_provider, this library allows specifying the location of the config file through environment variables. This is quite useful when you have multiple (slightly different) instances of a release running on the same machine, such as staging and production environments. Additionally, we allow custom transform modules.

Docs

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