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file_only_logger
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A simple logger that writes messages to log files only (not to the console).
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config/config_logger.exs
import Config
# Configuration values...
format = "\n$date $time [$level] $message\n"
truncate_default_in_bytes = 8 * 1024
truncate_in_bytes = truncate_default_in_bytes
config = %{file: ??, file_check: 5000, max_no_bytes: 300_000, max_no_files: 5}
# By ascending log level...
colors = [
debug: :light_cyan,
info: :light_green,
warning: :light_yellow,
error: :light_red
]
# Log file paths...
root_dir = File.cwd!()
debug_path = ~c"#{root_dir}/log/debug.log"
info_path = ~c"#{root_dir}/log/info.log"
warning_path = ~c"#{root_dir}/log/warning.log"
error_path = ~c"#{root_dir}/log/error.log"
formatter =
Logger.Formatter.new(
format: format,
# Prevents ANSI escape sequences in log files.
colors: [enabled: false],
truncate: truncate_in_bytes
)
config :logger, :default_formatter,
format: format,
colors: colors,
truncate: truncate_in_bytes
config :file_only_logger, :logger, [
# debug messages and above
{:handler, :debug_handler, :logger_std_h,
%{
level: :debug,
config: %{config | file: debug_path},
formatter: formatter
}},
# info messages and above
{:handler, :info_handler, :logger_std_h,
%{
level: :info,
config: %{config | file: info_path},
formatter: formatter
}},
# warning messages and above
{:handler, :warning_handler, :logger_std_h,
%{
level: :warning,
config: %{config | file: warning_path},
formatter: formatter
}},
# error messages and above
{:handler, :error_handler, :logger_std_h,
%{
level: :error,
config: %{config | file: error_path},
formatter: formatter
}}
]
# Purges debug messages...
# config :logger, compile_time_purge_matching: [[level_lower_than: :info]]
# Keeps only error messages and above...
# config :logger, compile_time_purge_matching: [[level_lower_than: :error]]
# Logs only error messages and above...
# config :logger, level: :error
# line_length =
# try do
# {keyword, _binding} = Code.eval_file(".formatter.exs")
# keyword[:line_length] || 98
# rescue
# _error -> 80
# end
# Changes here require to recompile app :file_only_logger.
config :file_only_logger, line_length: 80, padding: "\s\s"