LoggerJsonFileBackend

LoggerJsonFileBackend is elixir logger backend that writes json logs to a file.

Configuration

This logger backend provides follow options:

name	description
path	log file path. this option is "MUST"
level	minimum logging level. default is `:info`
metadata	included metadata keys list. detault is empty list
metadata_triming	if false, ignoring previous metadata options and all metadata are output. default is true
json_encoder	using json encoder. default poison

You need to add logger backend setting

config :logger,
  backends: [{LoggerJSONFileBackend, :log_name}]

config :logger, :log_name,
  path: "/var/log/my_app/app.log"
  level: :info
  metadata: [:request_id, :user_id, :method, :path, :req_params]
  json_encoder: JSON # or Poison

Use case

This module is assumed to be used with a custom plug logger.

Logger.info("request", [
  method:     conn.method,
  path:       conn.request_path,
  req_params: conn.params,
])