File-Only Logger

A simple logger that writes messages to log files only (not to the console). Elixir's Logger Backends were abandoned in favor of Erlang's Logger handlers.

Installation

Add file_only_logger to your list of dependencies in mix.exs:

def deps do
  [
    {:file_only_logger, "~> 0.2.0"}
  ]
end

Usage

Trying to log any message with severity less than the configured level will simply cause the message to be ignored.

The configuration values for log level are:

• :all (default)
• :none
• Logger.level()

You may use file config/runtime.exs to configure the above log level:

import Config

config :file_only_logger, level: :info

Example

defmodule Log do
  use File.Only.Logger

  warning :error_occurred, {reason, file} do
    """
    \n'error' occurred...
    Reason => '#{:file.format_error(reason)}'
    File => "#{Path.relative_to_cwd(file)}"\

    """
  end
end

defmodule Check do
  def log_warning do
    Log.warning(:error_occurred, {:enoent, __ENV__.file})
  end
end

Check.log_warning() # will log these lines in the configured log file(s):


2023-11-15 19:05:19.763 [warning]
'error' occurred...
Reason => 'no such file or directory'
File => "lib/file/only/logger/ie.ex"