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require 'monitor'
module Logify
class Logger
class << self
#
# @private
#
# @macro level
# @method $1(message = nil, &block)
# Write a new $1 message to the current IO object.
#
# @example Write a +:$1+ message
# log.$1 'This is a message'
#
# @example Write a lazy evaluated +:$1+ message
# log.$1 { perform_complex_operation }
#
# @param [String] message
# the message to log
# @param [Proc] block
# the block to call that returns a string to write
#
# @return [String]
# the compiled log message
#
def level(name)
constant = name.to_s.upcase
class_eval <<-EOH, __FILE__, __LINE__ + 1
def #{name}(message = nil, &block)
if Logify.level <= #{constant}
buffer = ''
if Logify.level == #{DEBUG}
buffer << formatted_id
buffer << SEPARATOR
buffer << PREFIX_LONG_#{constant}
else
buffer << PREFIX_#{constant}
end
buffer << filter(message) if message
buffer << filter(yield) if block_given?
buffer << "#{NEWLINE}"
MONITOR.synchronize { Logify.io.write(buffer) }
buffer
end
end
EOH
end
end
ANONYMOUS = '(Anonymous)'
FILTERED = '[FILTERED]'
MAX_LENGTH = 32
NEWLINE = "\n"
SEPARATOR = ' | '
MONITOR = Monitor.new
NONE = 5
FATAL = 4
ERROR = 3
WARN = 2
INFO = 1
DEBUG = 0
DEFAULT = WARN
LEVEL_MAP = {
none: NONE,
fatal: FATAL,
error: ERROR,
warn: WARN,
info: INFO,
debug: DEBUG,
}.freeze
PREFIX_FATAL = 'F: '
PREFIX_ERROR = 'E: '
PREFIX_WARN = 'W: '
PREFIX_INFO = 'I: '
PREFIX_DEBUG = 'D: '
PREFIX_LONG_FATAL = '!!!! '
PREFIX_LONG_ERROR = '>>>> '
PREFIX_LONG_WARN = '**** '
PREFIX_LONG_INFO = '===> '
PREFIX_LONG_DEBUG = ' '
level :fatal
level :error
level :warn
level :info
level :debug
#
# Create a new logger object.
#
# @param [String, nil] id
# the ID of the logger object to create
#
def initialize(id)
@id = id
end
private
#
# @private
#
# The truncated id (for debug only).
#
# @return [String]
# the formatted id
#
def formatted_id
return @formatted_id if @formatted_id
# Account for anonymous classes
id = @id ? @id.to_s : ANONYMOUS
if id.length == MAX_LENGTH
@formatted_id = id
elsif id.length < MAX_LENGTH
@formatted_id = id.rjust(MAX_LENGTH)
else
temp = id
until temp.length <= MAX_LENGTH
if temp.include?('::')
temp = temp.split('::')[1..-1].join('::')
else
temp = id[-MAX_LENGTH..-1]
end
end
@formatted_id = temp.rjust(MAX_LENGTH)
end
end
#
# @private
#
# Filter the given string of any filtered parameters.
#
# @see Logify.filter
#
# @param [String]
# the string to filter
#
# @return [String]
# the filtered string
#
def filter(string)
string.dup.tap do |copy|
Logify.filters.each do |param, _|
copy.gsub!(param, FILTERED)
end
end
end
end
end
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