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tz_extra

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Time zone-related utilities

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tz_extra lib update_periodically.ex
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lib/update_periodically.ex 

if Code.ensure_loaded?(Mint.HTTP) do

  defmodule TzExtra.UpdatePeriodically do

    use GenServer



    require Logger



    alias Tz.HTTP

    alias Tz.Updater

    alias TzExtra.Compiler



    def start_link(opts) do

      HTTP.get_http_client!()



      GenServer.start_link(__MODULE__, opts)

    end



    def init(opts) do

      work()

      schedule_work(opts[:interval_in_days])

      {:ok, %{opts: opts}}

    end



    def handle_info(:work, %{opts: opts}) do

      work()

      schedule_work(opts[:interval_in_days])

      {:noreply, %{opts: opts}}

    end



    defp work() do

      Logger.debug("TzExtra is checking for IANA time zone database updates")



      Updater.maybe_recompile()



      if Tz.iana_version() != TzExtra.iana_version() do

        Logger.info("TzExtra is recompiling time zone data...")

        Code.compiler_options(ignore_module_conflict: true)

        Compiler.compile()

        Code.compiler_options(ignore_module_conflict: false)

        Logger.info("TzExtra compilation done")

      end

    end



    defp schedule_work(interval_in_days) do

      interval_in_days = interval_in_days || 1

      Process.send_after(self(), :work, 24 * 60 * 60 * 1000) # In 24 hours


    end

  end

end