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# Opinioned Rails custom formatter
class BasicFormatter < SemanticLogger::Formatters::Color
NAME_MAX_SIZE = 25
CONTENT_PREFIX = ' '.freeze
ANSI_DEBUG = "\e[90m".freeze
ANSI_INFO = SemanticLogger::AnsiColors::GREEN
ANSI_WARN = SemanticLogger::AnsiColors::YELLOW
ANSI_ERROR = "\e[91m".freeze
ANSI_NEUTRAL_INFO = SemanticLogger::AnsiColors::WHITE
ANSI_REVERSED_WARNING = "\e[0;30;43m".freeze
ANSI_REVERSED_ERROR = "\e[1;30;41m".freeze
ANSI_REVERSED_FATAL = "\e[1;30;41m".freeze
CONTENT_COLOR_MAP = ColorMap.new(
debug: ANSI_DEBUG,
info: ANSI_NEUTRAL_INFO,
warn: ANSI_REVERSED_WARNING,
error: ANSI_REVERSED_ERROR,
fatal: ANSI_REVERSED_FATAL
)
EXCLUDE_LAMBDA = lambda { |log|
if log.name == 'ActionView::Base'
!log.message.starts_with?(' Rendering')
elsif log.name == 'Rails' && !log.message.nil?
log.message.exclude?('Started GET "/rails/live/reload')
else
true
end
}
def initialize
super(color_map: ColorMap.new(
debug: ANSI_DEBUG,
info: ANSI_INFO,
warn: ANSI_WARN,
error: ANSI_ERROR,
fatal: ANSI_ERROR
))
end
def message
return unless log.message
message = log.message
if log.name == 'Rails' && message.starts_with?('Completed')
message.rstrip!
message += "\n" unless message.starts_with?('Completed 5')
end
"#{CONTENT_COLOR_MAP[log.level]}#{message}#{color_map.clear}"
end
def level
level = log.level == :info ? ' ' : log.level.to_s.chr.upcase
"#{color}#{level}#{color_map.clear}"
end
def name
"#{ANSI_DEBUG}#{log.name.truncate(NAME_MAX_SIZE).center(NAME_MAX_SIZE)}#{color_map.clear}"
end
def exception # rubocop:disable Metrics/AbcSize
return unless log.exception
root_path = Rails.root.to_s
stack = log.exception.backtrace.select { |line| line.starts_with?(root_path) }
stack = stack.map { |line| line.delete_prefix("#{root_path}/") }
"#{ANSI_REVERSED_ERROR}#{log.exception.class}#{color_map.clear}: #{color}#{log.exception.message}#{color_map.clear}#{backtrace(stack)}" # rubocop:disable Layout/LineLength
end
def call(log, logger)
self.color = color_map[log.level]
self.log = log
self.logger = logger
[before_message, message, payload, exception].compact.join(' ')
end
private
def before_message
[name, level, tags, named_tags, duration, CONTENT_PREFIX].compact.join(' ')
end
def backtrace(stack)
nil unless stack.count.positive?
"\n#{before_message} #{ANSI_ERROR}#{stack.join("\n#{before_message} #{ANSI_ERROR}")}#{color_map.clear}"
end
end