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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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lib/file/only/logger/config.ex
defmodule File.Only.Logger.Config do
use PersistConfig
alias File.Only.Logger.Log
@format get_env(:format)
@truncate_in_bytes get_env(:truncate_default_in_bytes)
@config get_env(:config)
@colors get_env(:colors)
@formatter Logger.Formatter.new(
format: @format,
# Prevents ANSI escape sequences in log files.
colors: [enabled: false],
truncate: @truncate_in_bytes
)
@default_formatter Logger.default_formatter(
format: @format,
colors: @colors,
truncate: @truncate_in_bytes
)
defmacro update_handler_config(handler_id) do
formatter = Macro.escape(@default_formatter)
quote bind_quoted: [id: handler_id, formatter: formatter] do
case :logger.update_handler_config(id, :formatter, formatter) do
:ok -> :ok
{:error, reason} -> :ok = Log.error(:upd_config, {reason, id, __ENV__})
end
end
end
defmacro add_handler(level) do
# Relative to wherever the BEAM (Erlang VM) was started...
path = ~c"./log/#{level}.log"
config = %{@config | file: path}
config = %{level: level, config: config, formatter: @formatter}
config = Macro.escape(config)
handler_id = :"#{level}_handler"
quote bind_quoted: [id: handler_id, config: config] do
case :logger.add_handler(id, :logger_std_h, config) do
:ok -> :ok
{:error, reason} -> :ok = Log.error(:add_handler, {reason, id, __ENV__})
end
end
end
defmacro standard_formatter?(handler_id) do
template = ["\n", :time, " ", :metadata, "[", :level, "] ", :message, "\n"]
quote bind_quoted: [handler_id: handler_id, template: template] do
case :logger.get_handler_config(handler_id) do
{:ok,
%{
formatter:
{Logger.Formatter,
%Logger.Formatter{template: template, colors: %{error: :red}}}
}} ->
true
_else ->
false
end
end
end
defmacro add_handlers(app) do
quote bind_quoted: [app: app] do
case Logger.add_handlers(app) do
:ok -> :ok
{:error, reason} -> :ok = Log.error(:handlers, {reason, app, __ENV__})
end
end
end
end