Faraday Middleware to log request bodies.

log_request_bodies.rb

# Custom Faraday Middleware to log request bodies
#
# Code borrowed from https://github.com/lostisland/faraday/pull/277
# Once the pull request gets merged, this middleware is unnecessary.
#
# Default option is to not print request bodies
#
# Example usage:
#
#  # Defaults logger
#  Faraday.new() do |conn|
#    conn.use LogRequestBodies, nil, { :bodies => true }
#  end
#
#  # Custom logger
#  Faraday.new() do |conn|
#    conn.use LogRequestBodies, custom_logger, { :bodies => true }
#  end
#
class LogRequestBodies < Faraday::Response::Middleware
  extend Forwardable

  DEFAULT_OPTIONS = { :bodies => false }

  def initialize(app, logger = nil, options = {})
    super(app)
    @logger = logger || begin
      require 'logger'
      ::Logger.new(STDOUT)
    end
    @options = DEFAULT_OPTIONS.merge(options)
  end

  def_delegators :@logger, :debug, :info, :warn, :error, :fatal

  def call(env)
    debug('request') { dump_body(env[:body]) } if env[:body] && log_body?(:request)

    @app.call(env).on_complete do |env|
      debug('response') { dump_body env[:body] } if env[:body] && log_body?(:response)
    end
  end

  def dump_body(body)
    if body.respond_to?(:to_str)
      body.to_str
    else
      pretty_inspect(body)
    end
  end

  def pretty_inspect(body)
    require 'pp' unless body.respond_to?(:pretty_inspect)
    body.pretty_inspect
  end

  def log_body?(type)
    case @options[:bodies]
    when Hash then @options[:bodies][type]
    else @options[:bodies]
    end
  end
end