ecto repo logging

repo.ex

defmodule MyApp.Repo do                                                               
  use Ecto.Repo, otp_app: :my_app                                                           
                                                                                           
  def log(entry) do                                                                                              
    Logger.info(fn ->                                                                                            
      [log_time("measure#database.query", entry.query_time, true), log_time("measure#database.queue", entry.queue_time, false)]
    end)                                                                                                         
    super(entry)
  end

  defp log_time(_label, nil, _force), do: []                                              
  defp log_time(label, time, force) do                                                                            
    ms = div(time, 100) / 10                                                                                     
    if force or ms > 0 do                                                                                        
      [?\s, label, ?=, :io_lib_format.fwrite_g(ms), ?m, ?s]                                                      
    else                                                                                                         
      []                                                                                                      
    end                                                                                                          
  end                                                                                                            
end