Customize logger

The logger logs information about your experiments to help you with debugging. You can customize where log information is sent and what kind of information is tracked.

The Ruby SDK does not have a logger enabled by default. You need to pass in a logger to the SDK to have basic logging functionality. The Ruby SDK provides a simple logger implementation that you can instantiate and pass in.

To improve your experience setting up the SDK and configuring your production environment, we recommend that you pass in a logger for your Optimizely client. See the code example below.

# Require the logger library in to get the log levels
require 'logger'

# Instantiate an Optimizely logger with the default log level Logger::INFO
logger = Optimizely::SimpleLogger.new 

# You can also instantiate with a custom log level
logger = Optimizely::SimpleLogger.new(Logger::DEBUG)

# Instantiate the Optimizely client with our logger
optimizely_client = Optimizely::Project.new(
  datafile,
  nil, # don't override the EventDispatcher
  logger
)

Use your own logger

For finer control over your SDK configuration in a production environment, pass in a custom logger for your Optimizely client. A custom logger is a function that takes an argument, the level, and the message. See the code example below to create and set a custom logger.

# Define your own custom logger that inherits from the Optimizely base logger
class CustomLogger < Optimizely::BaseLogger

  def initialize()
    @logger = Logger.new(STDOUT)
  end

  def log(level, message)
    # You can handle the message here in any way you'd like
    custom_message = "Custom logged: #{message}"
    @logger.add(level, custom_message)
  end

end

Log levels

The table below lists the log levels for the Ruby SDK.