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chromic_pdf

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

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chromic_pdf lib chromic_pdf pdf chrome_impl.ex
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lib/chromic_pdf/pdf/chrome_impl.ex 

defmodule ChromicPDF.ChromeImpl do

  @moduledoc false



  @behaviour ChromicPDF.Chrome



  def spawn(opts) do

    port = Port.open({:spawn, chrome_command(opts)}, port_opts(opts))

    Port.monitor(port)



    {:ok, port}

  end



  def send_msg(port, msg) do

    send(port, {self(), {:command, msg <> "\0"}})



    :ok

  end



  # NOTE: The redirection is needed due to obscure behaviour of Ports that use more than 2 FDs.

  # https://github.com/bitcrowd/chromic_pdf/issues/76



  defp chrome_command(opts) do

    [

      ~s("#{chrome_executable()}"),

      "--headless --disable-gpu --remote-debugging-pipe"

    ]

    |> append_if("--no-sandbox", no_sandbox?(opts))

    |> append_if(to_string(opts[:chrome_args]), !!opts[:chrome_args])

    |> append_if("2>/dev/null 3<&0 4>&1", discard_stderr?(opts))

    |> Enum.join(" ")

  end



  defp port_opts(opts) do

    append_if([:binary], :nouse_stdio, !discard_stderr?(opts))

  end



  defp append_if(list, _value, false), do: list

  defp append_if(list, value, true), do: list ++ [value]



  defp no_sandbox?(opts), do: Keyword.get(opts, :no_sandbox, false)

  defp discard_stderr?(opts), do: Keyword.get(opts, :discard_stderr, true)



  @chrome_paths [

    "chromium-browser",

    "chromium",

    "google-chrome",

    "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"

  ]



  defp chrome_executable do

    executable =

      @chrome_paths

      |> Stream.map(&System.find_executable/1)

      |> Enum.find(& &1)



    executable || raise "could not find executable from #{inspect(@chrome_paths)}"

  end

end