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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 session_pool.ex
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lib/chromic_pdf/pdf/session_pool.ex 

defmodule ChromicPDF.SessionPool do

  @moduledoc false



  alias ChromicPDF.Session



  @cores System.schedulers_online()

  @default_pool_size Application.get_env(:chromic_pdf, :default_pool_size, div(@cores, 2))

  @default_timeout Application.get_env(:chromic_pdf, :default_timeout, 5000)



  @spec run_protocol(atom(), module(), keyword()) :: {:ok, any()} | {:error, term()}

  def run_protocol(chromic, protocol_mod, opts) do

    timeout = Keyword.get(opts, :timeout, @default_timeout)



    :poolboy.transaction(

      pool_name(chromic),

      &Session.run_protocol(&1, protocol_mod, opts),

      timeout

    )

  end



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

  def child_spec(args) do

    pool_name =

      args

      |> Keyword.fetch!(:chromic)

      |> pool_name()



    pool_args = Keyword.get(args, :session_pool, [])



    :poolboy.child_spec(

      pool_name,

      Keyword.merge(pool_args(pool_name), pool_args),

      args

    )

  end



  defp pool_args(pool_name) do

    [

      name: {:local, pool_name},

      worker_module: ChromicPDF.Session,

      size: @default_pool_size,

      max_overflow: 0

    ]

  end



  def pool_name(chromic) do

    Module.concat(chromic, :SessionPool)

  end

end