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The tiny library to ease handling expiring invalidated cached series.

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vela lib invalid_access.ex
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lib/invalid_access.ex 

defmodule Vela.AccessError do

  @moduledoc """

  The generic exception thrown when the access in invalid.



  Parameters:



  - `source` the source of the exception

  - `field` the field the access to has failed

  """

  defexception [:message, :source, :field]



  @impl true

  def exception(opts) do

    source =

      case Keyword.get(opts, :source, "N/A") do

        %type{} -> type

        s when is_binary(s) -> s

        other -> inspect(other)

      end



    field = opts |> Keyword.get(:field, "N/A") |> inspect()

    message = "Invalid access attempt. Field #{field} is not available on #{source}."



    %Vela.AccessError{source: source, field: field, message: message}

  end

end