35 lines
1.1 KiB
Elixir
35 lines
1.1 KiB
Elixir
defmodule GeoTherminator.ConfigHelpers do
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@type config_type :: :str | :int | :bool | :json
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@doc """
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Get value from environment variable, converting it to the given type if needed.
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If no default value is given, or `:no_default` is given as the default, an error is raised if the variable is not
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set.
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"""
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@spec get_env(String.t(), :no_default | any(), config_type()) :: any()
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def get_env(var, default \\ :no_default, type \\ :str)
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def get_env(var, :no_default, type) do
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System.fetch_env!(var)
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|> get_with_type(type)
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end
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def get_env(var, default, type) do
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with {:ok, val} <- System.fetch_env(var) do
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get_with_type(val, type)
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else
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:error -> default
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end
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end
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@spec get_with_type(String.t(), config_type()) :: any()
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defp get_with_type(val, type)
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defp get_with_type(val, :str), do: val
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defp get_with_type(val, :int), do: String.to_integer(val)
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defp get_with_type("true", :bool), do: true
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defp get_with_type("false", :bool), do: false
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defp get_with_type(val, :json), do: Jason.decode!(val)
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defp get_with_type(val, type), do: raise("Cannot convert to #{inspect(type)}: #{inspect(val)}")
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end
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