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chromic_pdf

1.2.0
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Fast HTML-2-PDF/A renderer based on Chrome & Ghostscript

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chromic_pdf lib chromic_pdf pdfa ghostscript_pool.ex
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lib/chromic_pdf/pdfa/ghostscript_pool.ex 

defmodule ChromicPDF.GhostscriptPool do

  @moduledoc false



  @behaviour NimblePool



  import ChromicPDF.Utils, only: [default_pool_size: 0]

  alias ChromicPDF.GhostscriptWorker



  # ------------- API ----------------



  @spec child_spec(keyword()) :: Supervisor.child_spec()

  def child_spec(args) do

    %{

      id: __MODULE__,

      start: {__MODULE__, :start_link, [args]}

    }

  end



  @spec start_link(Keyword.t()) :: GenServer.on_start()

  def start_link(args) do

    NimblePool.start_link(

      worker: {__MODULE__, args},

      pool_size: pool_size(args)

    )

  end



  defp pool_size(args) do

    get_in(args, [:ghostscript_pool, :size]) || default_pool_size()

  end



  # Converts a PDF to PDF-A/2 using Ghostscript.

  @spec convert(pid(), binary(), keyword(), binary()) :: :ok

  def convert(pool, pdf_path, params, output_path) do

    NimblePool.checkout!(pool, :checkout, fn _from, _worker_state ->

      {GhostscriptWorker.convert(pdf_path, params, output_path), :ok}

    end)

  end



  # ------------ Callbacks -----------



  @impl NimblePool

  def init_worker(pool_state) do

    {:ok, nil, pool_state}

  end



  @impl NimblePool

  def handle_checkout(:checkout, _from, worker_state, pool_state) do

    {:ok, worker_state, worker_state, pool_state}

  end

end