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Edit File : logger.rb \| Size : 16.54 KB
# frozen_string_literal: true # logger.rb - simple logging utility # Copyright (C) 2000-2003, 2005, 2008, 2011 NAKAMURA, Hiroshi <nahi@ruby-lang.org>. # # Documentation:: NAKAMURA, Hiroshi and Gavin Sinclair # License:: # You can redistribute it and/or modify it under the same terms of Ruby's # license; either the dual license version in 2003, or any later version. # Revision:: $Id$ # # A simple system for logging messages. See Logger for more documentation. require 'monitor' require_relative 'logger/version' require_relative 'logger/formatter' require_relative 'logger/log_device' require_relative 'logger/severity' require_relative 'logger/errors' # == Description # # The Logger class provides a simple but sophisticated logging utility that # you can use to output messages. # # The messages have associated levels, such as +INFO+ or +ERROR+ that indicate # their importance. You can then give the Logger a level, and only messages # at that level or higher will be printed. # # The levels are: # # +UNKNOWN+:: An unknown message that should always be logged. # +FATAL+:: An unhandleable error that results in a program crash. # +ERROR+:: A handleable error condition. # +WARN+:: A warning. # +INFO+:: Generic (useful) information about system operation. # +DEBUG+:: Low-level information for developers. # # For instance, in a production system, you may have your Logger set to # +INFO+ or even +WARN+. # When you are developing the system, however, you probably # want to know about the program's internal state, and would set the Logger to # +DEBUG+. # # Note: Logger does not escape or sanitize any messages passed to it. # Developers should be aware of when potentially malicious data (user-input) # is passed to Logger, and manually escape the untrusted data: # # logger.info("User-input: #{input.dump}") # logger.info("User-input: %p" % input) # # You can use #formatter= for escaping all data. # # original_formatter = Logger::Formatter.new # logger.formatter = proc { \|severity, datetime, progname, msg\| # original_formatter.call(severity, datetime, progname, msg.dump) # } # logger.info(input) # # === Example # # This creates a Logger that outputs to the standard output stream, with a # level of +WARN+: # # require 'logger' # # logger = Logger.new(STDOUT) # logger.level = Logger::WARN # # logger.debug("Created logger") # logger.info("Program started") # logger.warn("Nothing to do!") # # path = "a_non_existent_file" # # begin # File.foreach(path) do \|line\| # unless line =~ /^(\w+) = (.)$/ # logger.error("Line in wrong format: #{line.chomp}") # end # end # rescue => err # logger.fatal("Caught exception; exiting") # logger.fatal(err) # end # # Because the Logger's level is set to +WARN+, only the warning, error, and # fatal messages are recorded. The debug and info messages are silently # discarded. # # === Features # # There are several interesting features that Logger provides, like # auto-rolling of log files, setting the format of log messages, and # specifying a program name in conjunction with the message. The next section # shows you how to achieve these things. # # # == HOWTOs # # === How to create a logger # # The options below give you various choices, in more or less increasing # complexity. # # 1. Create a logger which logs messages to STDERR/STDOUT. # # logger = Logger.new(STDERR) # logger = Logger.new(STDOUT) # # 2. Create a logger for the file which has the specified name. # # logger = Logger.new('logfile.log') # # 3. Create a logger for the specified file. # # file = File.open('foo.log', File::WRONLY \| File::APPEND) # # To create new logfile, add File::CREAT like: # # file = File.open('foo.log', File::WRONLY \| File::APPEND \| File::CREAT) # logger = Logger.new(file) # # 4. Create a logger which ages the logfile once it reaches a certain size. # Leave 10 "old" log files where each file is about 1,024,000 bytes. # # logger = Logger.new('foo.log', 10, 1024000) # # 5. Create a logger which ages the logfile daily/weekly/monthly. # # logger = Logger.new('foo.log', 'daily') # logger = Logger.new('foo.log', 'weekly') # logger = Logger.new('foo.log', 'monthly') # # === How to log a message # # Notice the different methods (+fatal+, +error+, +info+) being used to log # messages of various levels? Other methods in this family are +warn+ and # +debug+. +add+ is used below to log a message of an arbitrary (perhaps # dynamic) level. # # 1. Message in a block. # # logger.fatal { "Argument 'foo' not given." } # # 2. Message as a string. # # logger.error "Argument #{@foo} mismatch." # # 3. With progname. # # logger.info('initialize') { "Initializing..." } # # 4. With severity. # # logger.add(Logger::FATAL) { 'Fatal error!' } # # The block form allows you to create potentially complex log messages, # but to delay their evaluation until and unless the message is # logged. For example, if we have the following: # # logger.debug { "This is a " + potentially + " expensive operation" } # # If the logger's level is +INFO+ or higher, no debug messages will be logged, # and the entire block will not even be evaluated. Compare to this: # # logger.debug("This is a " + potentially + " expensive operation") # # Here, the string concatenation is done every time, even if the log # level is not set to show the debug message. # # === How to close a logger # # logger.close # # === Setting severity threshold # # 1. Original interface. # # logger.sev_threshold = Logger::WARN # # 2. Log4r (somewhat) compatible interface. # # logger.level = Logger::INFO # # # DEBUG < INFO < WARN < ERROR < FATAL < UNKNOWN # # 3. Symbol or String (case insensitive) # # logger.level = :info # logger.level = 'INFO' # # # :debug < :info < :warn < :error < :fatal < :unknown # # 4. Constructor # # Logger.new(logdev, level: Logger::INFO) # Logger.new(logdev, level: :info) # Logger.new(logdev, level: 'INFO') # # == Format # # Log messages are rendered in the output stream in a certain format by # default. The default format and a sample are shown below: # # Log format: # SeverityID, [DateTime #pid] SeverityLabel -- ProgName: message # # Log sample: # I, [1999-03-03T02:34:24.895701 #19074] INFO -- Main: info. # # You may change the date and time format via #datetime_format=. # # logger.datetime_format = '%Y-%m-%d %H:%M:%S' # # e.g. "2004-01-03 00:54:26" # # or via the constructor. # # Logger.new(logdev, datetime_format: '%Y-%m-%d %H:%M:%S') # # Or, you may change the overall format via the #formatter= method. # # logger.formatter = proc do \|severity, datetime, progname, msg\| # "#{datetime}: #{msg}\n" # end # # e.g. "2005-09-22 08:51:08 +0900: hello world" # # or via the constructor. # # Logger.new(logdev, formatter: proc {\|severity, datetime, progname, msg\| # "#{datetime}: #{msg}\n" # }) # class Logger _, name, rev = %w$Id$ if name name = name.chomp(",v") else name = File.basename(__FILE__) end rev \|\|= "v#{VERSION}" ProgName = "#{name}/#{rev}" include Severity # Logging severity threshold (e.g. <tt>Logger::INFO</tt>). attr_reader :level # Set logging severity threshold. # # +severity+:: The Severity of the log message. def level=(severity) if severity.is_a?(Integer) @level = severity else case severity.to_s.downcase when 'debug' @level = DEBUG when 'info' @level = INFO when 'warn' @level = WARN when 'error' @level = ERROR when 'fatal' @level = FATAL when 'unknown' @level = UNKNOWN else raise ArgumentError, "invalid log level: #{severity}" end end end # Program name to include in log messages. attr_accessor :progname # Set date-time format. # # +datetime_format+:: A string suitable for passing to +strftime+. def datetime_format=(datetime_format) @default_formatter.datetime_format = datetime_format end # Returns the date format being used. See #datetime_format= def datetime_format @default_formatter.datetime_format end # Logging formatter, as a +Proc+ that will take four arguments and # return the formatted message. The arguments are: # # +severity+:: The Severity of the log message. # +time+:: A Time instance representing when the message was logged. # +progname+:: The #progname configured, or passed to the logger method. # +msg+:: The _Object_ the user passed to the log message; not necessarily a # String. # # The block should return an Object that can be written to the logging # device via +write+. The default formatter is used when no formatter is # set. attr_accessor :formatter alias sev_threshold level alias sev_threshold= level= # Returns +true+ if and only if the current severity level allows for the printing of # +DEBUG+ messages. def debug?; level <= DEBUG; end # Sets the severity to DEBUG. def debug!; self.level = DEBUG; end # Returns +true+ if and only if the current severity level allows for the printing of # +INFO+ messages. def info?; level <= INFO; end # Sets the severity to INFO. def info!; self.level = INFO; end # Returns +true+ if and only if the current severity level allows for the printing of # +WARN+ messages. def warn?; level <= WARN; end # Sets the severity to WARN. def warn!; self.level = WARN; end # Returns +true+ if and only if the current severity level allows for the printing of # +ERROR+ messages. def error?; level <= ERROR; end # Sets the severity to ERROR. def error!; self.level = ERROR; end # Returns +true+ if and only if the current severity level allows for the printing of # +FATAL+ messages. def fatal?; level <= FATAL; end # Sets the severity to FATAL. def fatal!; self.level = FATAL; end # # :call-seq: # Logger.new(logdev, shift_age = 0, shift_size = 1048576) # Logger.new(logdev, shift_age = 'weekly') # Logger.new(logdev, level: :info) # Logger.new(logdev, progname: 'progname') # Logger.new(logdev, formatter: formatter) # Logger.new(logdev, datetime_format: '%Y-%m-%d %H:%M:%S') # # === Args # # +logdev+:: # The log device. This is a filename (String), IO object (typically # +STDOUT+, +STDERR+, or an open file), +nil+ (it writes nothing) or # +File::NULL+ (same as +nil+). # +shift_age+:: # Number of old log files to keep, or* frequency of rotation (+daily+, # +weekly+ or +monthly+). Default value is 0, which disables log file # rotation. # +shift_size+:: # Maximum logfile size in bytes (only applies when +shift_age+ is a positive # Integer). Defaults to +1048576+ (1MB). # +level+:: # Logging severity threshold. Default values is Logger::DEBUG. # +progname+:: # Program name to include in log messages. Default value is nil. # +formatter+:: # Logging formatter. Default values is an instance of Logger::Formatter. # +datetime_format+:: # Date and time format. Default value is '%Y-%m-%d %H:%M:%S'. # +binmode+:: # Use binary mode on the log device. Default value is false. # +shift_period_suffix+:: # The log file suffix format for +daily+, +weekly+ or +monthly+ rotation. # Default is '%Y%m%d'. # # === Description # # Create an instance. # def initialize(logdev, shift_age = 0, shift_size = 1048576, level: DEBUG, progname: nil, formatter: nil, datetime_format: nil, binmode: false, shift_period_suffix: '%Y%m%d') self.level = level self.progname = progname @default_formatter = Formatter.new self.datetime_format = datetime_format self.formatter = formatter @logdev = nil if logdev && logdev != File::NULL @logdev = LogDevice.new(logdev, shift_age: shift_age, shift_size: shift_size, shift_period_suffix: shift_period_suffix, binmode: binmode) end end # # :call-seq: # Logger#reopen # Logger#reopen(logdev) # # === Args # # +logdev+:: # The log device. This is a filename (String) or IO object (typically # +STDOUT+, +STDERR+, or an open file). reopen the same filename if # it is +nil+, do nothing for IO. Default is +nil+. # # === Description # # Reopen a log device. # def reopen(logdev = nil) @logdev&.reopen(logdev) self end # # :call-seq: # Logger#add(severity, message = nil, progname = nil) { ... } # # === Args # # +severity+:: # Severity. Constants are defined in Logger namespace: +DEBUG+, +INFO+, # +WARN+, +ERROR+, +FATAL+, or +UNKNOWN+. # +message+:: # The log message. A String or Exception. # +progname+:: # Program name string. Can be omitted. Treated as a message if no # +message+ and +block+ are given. # +block+:: # Can be omitted. Called to get a message string if +message+ is nil. # # === Return # # When the given severity is not high enough (for this particular logger), # log no message, and return +true+. # # === Description # # Log a message if the given severity is high enough. This is the generic # logging method. Users will be more inclined to use #debug, #info, #warn, # #error, and #fatal. # # <b>Message format</b>: +message+ can be any object, but it has to be # converted to a String in order to log it. Generally, +inspect+ is used # if the given object is not a String. # A special case is an +Exception+ object, which will be printed in detail, # including message, class, and backtrace. See #msg2str for the # implementation if required. # # === Bugs # # * Logfile is not locked. # * Append open does not need to lock file. # * If the OS supports multi I/O, records possibly may be mixed. # def add(severity, message = nil, progname = nil) severity \|\|= UNKNOWN if @logdev.nil? or severity < level return true end if progname.nil? progname = @progname end if message.nil? if block_given? message = yield else message = progname progname = @progname end end @logdev.write( format_message(format_severity(severity), Time.now, progname, message)) true end alias log add # # Dump given message to the log device without any formatting. If no log # device exists, return +nil+. # def <<(msg) @logdev&.write(msg) end # # Log a +DEBUG+ message. # # See #info for more information. # def debug(progname = nil, &block) add(DEBUG, nil, progname, &block) end # # :call-seq: # info(message) # info(progname, &block) # # Log an +INFO+ message. # # +message+:: The message to log; does not need to be a String. # +progname+:: In the block form, this is the #progname to use in the # log message. The default can be set with #progname=. # +block+:: Evaluates to the message to log. This is not evaluated unless # the logger's level is sufficient to log the message. This # allows you to create potentially expensive logging messages that # are only called when the logger is configured to show them. # # === Examples # # logger.info("MainApp") { "Received connection from #{ip}" } # # ... # logger.info "Waiting for input from user" # # ... # logger.info { "User typed #{input}" } # # You'll probably stick to the second form above, unless you want to provide a # program name (which you can do with #progname= as well). # # === Return # # See #add. # def info(progname = nil, &block) add(INFO, nil, progname, &block) end # # Log a +WARN+ message. # # See #info for more information. # def warn(progname = nil, &block) add(WARN, nil, progname, &block) end # # Log an +ERROR+ message. # # See #info for more information. # def error(progname = nil, &block) add(ERROR, nil, progname, &block) end # # Log a +FATAL+ message. # # See #info for more information. # def fatal(progname = nil, &block) add(FATAL, nil, progname, &block) end # # Log an +UNKNOWN+ message. This will be printed no matter what the logger's # level is. # # See #info for more information. # def unknown(progname = nil, &block) add(UNKNOWN, nil, progname, &block) end # # Close the logging device. # def close @logdev&.close end private # Severity label for logging (max 5 chars). SEV_LABEL = %w(DEBUG INFO WARN ERROR FATAL ANY).freeze def format_severity(severity) SEV_LABEL[severity] \|\| 'ANY' end def format_message(severity, datetime, progname, msg) (@formatter \|\| @default_formatter).call(severity, datetime, progname, msg) end end Back

Edit File : logger.rb | Size : 16.54 KB

# frozen_string_literal: true
# logger.rb - simple logging utility
# Copyright (C) 2000-2003, 2005, 2008, 2011  NAKAMURA, Hiroshi <nahi@ruby-lang.org>.
#
# Documentation:: NAKAMURA, Hiroshi and Gavin Sinclair
# License::
#   You can redistribute it and/or modify it under the same terms of Ruby's
#   license; either the dual license version in 2003, or any later version.
# Revision:: $Id$
#
# A simple system for logging messages.  See Logger for more documentation.

require 'monitor'

require_relative 'logger/version'
require_relative 'logger/formatter'
require_relative 'logger/log_device'
require_relative 'logger/severity'
require_relative 'logger/errors'

# == Description
#
# The Logger class provides a simple but sophisticated logging utility that
# you can use to output messages.
#
# The messages have associated levels, such as +INFO+ or +ERROR+ that indicate
# their importance.  You can then give the Logger a level, and only messages
# at that level or higher will be printed.
#
# The levels are:
#
# +UNKNOWN+:: An unknown message that should always be logged.
# +FATAL+:: An unhandleable error that results in a program crash.
# +ERROR+:: A handleable error condition.
# +WARN+::  A warning.
# +INFO+::  Generic (useful) information about system operation.
# +DEBUG+:: Low-level information for developers.
#
# For instance, in a production system, you may have your Logger set to
# +INFO+ or even +WARN+.
# When you are developing the system, however, you probably
# want to know about the program's internal state, and would set the Logger to
# +DEBUG+.
#
# *Note*: Logger does not escape or sanitize any messages passed to it.
# Developers should be aware of when potentially malicious data (user-input)
# is passed to Logger, and manually escape the untrusted data:
#
#   logger.info("User-input: #{input.dump}")
#   logger.info("User-input: %p" % input)
#
# You can use #formatter= for escaping all data.
#
#   original_formatter = Logger::Formatter.new
#   logger.formatter = proc { |severity, datetime, progname, msg|
#     original_formatter.call(severity, datetime, progname, msg.dump)
#   }
#   logger.info(input)
#
# === Example
#
# This creates a Logger that outputs to the standard output stream, with a
# level of +WARN+:
#
#   require 'logger'
#
#   logger = Logger.new(STDOUT)
#   logger.level = Logger::WARN
#
#   logger.debug("Created logger")
#   logger.info("Program started")
#   logger.warn("Nothing to do!")
#
#   path = "a_non_existent_file"
#
#   begin
#     File.foreach(path) do |line|
#       unless line =~ /^(\w+) = (.*)$/
#         logger.error("Line in wrong format: #{line.chomp}")
#       end
#     end
#   rescue => err
#     logger.fatal("Caught exception; exiting")
#     logger.fatal(err)
#   end
#
# Because the Logger's level is set to +WARN+, only the warning, error, and
# fatal messages are recorded.  The debug and info messages are silently
# discarded.
#
# === Features
#
# There are several interesting features that Logger provides, like
# auto-rolling of log files, setting the format of log messages, and
# specifying a program name in conjunction with the message.  The next section
# shows you how to achieve these things.
#
#
# == HOWTOs
#
# === How to create a logger
#
# The options below give you various choices, in more or less increasing
# complexity.
#
# 1. Create a logger which logs messages to STDERR/STDOUT.
#
#      logger = Logger.new(STDERR)
#      logger = Logger.new(STDOUT)
#
# 2. Create a logger for the file which has the specified name.
#
#      logger = Logger.new('logfile.log')
#
# 3. Create a logger for the specified file.
#
#      file = File.open('foo.log', File::WRONLY | File::APPEND)
#      # To create new logfile, add File::CREAT like:
#      # file = File.open('foo.log', File::WRONLY | File::APPEND | File::CREAT)
#      logger = Logger.new(file)
#
# 4. Create a logger which ages the logfile once it reaches a certain size.
#    Leave 10 "old" log files where each file is about 1,024,000 bytes.
#
#      logger = Logger.new('foo.log', 10, 1024000)
#
# 5. Create a logger which ages the logfile daily/weekly/monthly.
#
#      logger = Logger.new('foo.log', 'daily')
#      logger = Logger.new('foo.log', 'weekly')
#      logger = Logger.new('foo.log', 'monthly')
#
# === How to log a message
#
# Notice the different methods (+fatal+, +error+, +info+) being used to log
# messages of various levels?  Other methods in this family are +warn+ and
# +debug+.  +add+ is used below to log a message of an arbitrary (perhaps
# dynamic) level.
#
# 1. Message in a block.
#
#      logger.fatal { "Argument 'foo' not given." }
#
# 2. Message as a string.
#
#      logger.error "Argument #{@foo} mismatch."
#
# 3. With progname.
#
#      logger.info('initialize') { "Initializing..." }
#
# 4. With severity.
#
#      logger.add(Logger::FATAL) { 'Fatal error!' }
#
# The block form allows you to create potentially complex log messages,
# but to delay their evaluation until and unless the message is
# logged.  For example, if we have the following:
#
#     logger.debug { "This is a " + potentially + " expensive operation" }
#
# If the logger's level is +INFO+ or higher, no debug messages will be logged,
# and the entire block will not even be evaluated.  Compare to this:
#
#     logger.debug("This is a " + potentially + " expensive operation")
#
# Here, the string concatenation is done every time, even if the log
# level is not set to show the debug message.
#
# === How to close a logger
#
#      logger.close
#
# === Setting severity threshold
#
# 1. Original interface.
#
#      logger.sev_threshold = Logger::WARN
#
# 2. Log4r (somewhat) compatible interface.
#
#      logger.level = Logger::INFO
#
#      # DEBUG < INFO < WARN < ERROR < FATAL < UNKNOWN
#
# 3. Symbol or String (case insensitive)
#
#      logger.level = :info
#      logger.level = 'INFO'
#
#      # :debug < :info < :warn < :error < :fatal < :unknown
#
# 4. Constructor
#
#      Logger.new(logdev, level: Logger::INFO)
#      Logger.new(logdev, level: :info)
#      Logger.new(logdev, level: 'INFO')
#
# == Format
#
# Log messages are rendered in the output stream in a certain format by
# default.  The default format and a sample are shown below:
#
# Log format:
#   SeverityID, [DateTime #pid] SeverityLabel -- ProgName: message
#
# Log sample:
#   I, [1999-03-03T02:34:24.895701 #19074]  INFO -- Main: info.
#
# You may change the date and time format via #datetime_format=.
#
#   logger.datetime_format = '%Y-%m-%d %H:%M:%S'
#         # e.g. "2004-01-03 00:54:26"
#
# or via the constructor.
#
#   Logger.new(logdev, datetime_format: '%Y-%m-%d %H:%M:%S')
#
# Or, you may change the overall format via the #formatter= method.
#
#   logger.formatter = proc do |severity, datetime, progname, msg|
#     "#{datetime}: #{msg}\n"
#   end
#   # e.g. "2005-09-22 08:51:08 +0900: hello world"
#
# or via the constructor.
#
#   Logger.new(logdev, formatter: proc {|severity, datetime, progname, msg|
#     "#{datetime}: #{msg}\n"
#   })
#
class Logger
  _, name, rev = %w$Id$
  if name
    name = name.chomp(",v")
  else
    name = File.basename(__FILE__)
  end
  rev ||= "v#{VERSION}"
  ProgName = "#{name}/#{rev}"

include Severity

# Logging severity threshold (e.g. <tt>Logger::INFO</tt>).
  attr_reader :level

# Set logging severity threshold.
  #
  # +severity+:: The Severity of the log message.
  def level=(severity)
    if severity.is_a?(Integer)
      @level = severity
    else
      case severity.to_s.downcase
      when 'debug'
        @level = DEBUG
      when 'info'
        @level = INFO
      when 'warn'
        @level = WARN
      when 'error'
        @level = ERROR
      when 'fatal'
        @level = FATAL
      when 'unknown'
        @level = UNKNOWN
      else
        raise ArgumentError, "invalid log level: #{severity}"
      end
    end
  end

# Program name to include in log messages.
  attr_accessor :progname

# Set date-time format.
  #
  # +datetime_format+:: A string suitable for passing to +strftime+.
  def datetime_format=(datetime_format)
    @default_formatter.datetime_format = datetime_format
  end

# Returns the date format being used.  See #datetime_format=
  def datetime_format
    @default_formatter.datetime_format
  end

# Logging formatter, as a +Proc+ that will take four arguments and
  # return the formatted message. The arguments are:
  #
  # +severity+:: The Severity of the log message.
  # +time+:: A Time instance representing when the message was logged.
  # +progname+:: The #progname configured, or passed to the logger method.
  # +msg+:: The _Object_ the user passed to the log message; not necessarily a
  #         String.
  #
  # The block should return an Object that can be written to the logging
  # device via +write+.  The default formatter is used when no formatter is
  # set.
  attr_accessor :formatter

alias sev_threshold level
  alias sev_threshold= level=

# Returns +true+ if and only if the current severity level allows for the printing of
  # +DEBUG+ messages.
  def debug?; level <= DEBUG; end

# Sets the severity to DEBUG.
  def debug!; self.level = DEBUG; end

# Returns +true+ if and only if the current severity level allows for the printing of
  # +INFO+ messages.
  def info?; level <= INFO; end

# Sets the severity to INFO.
  def info!; self.level = INFO; end

# Returns +true+ if and only if the current severity level allows for the printing of
  # +WARN+ messages.
  def warn?; level <= WARN; end

# Sets the severity to WARN.
  def warn!; self.level = WARN; end

# Returns +true+ if and only if the current severity level allows for the printing of
  # +ERROR+ messages.
  def error?; level <= ERROR; end

# Sets the severity to ERROR.
  def error!; self.level = ERROR; end

# Returns +true+ if and only if the current severity level allows for the printing of
  # +FATAL+ messages.
  def fatal?; level <= FATAL; end

# Sets the severity to FATAL.
  def fatal!; self.level = FATAL; end

#
  # :call-seq:
  #   Logger.new(logdev, shift_age = 0, shift_size = 1048576)
  #   Logger.new(logdev, shift_age = 'weekly')
  #   Logger.new(logdev, level: :info)
  #   Logger.new(logdev, progname: 'progname')
  #   Logger.new(logdev, formatter: formatter)
  #   Logger.new(logdev, datetime_format: '%Y-%m-%d %H:%M:%S')
  #
  # === Args
  #
  # +logdev+::
  #   The log device.  This is a filename (String), IO object (typically
  #   +STDOUT+, +STDERR+, or an open file), +nil+ (it writes nothing) or
  #   +File::NULL+ (same as +nil+).
  # +shift_age+::
  #   Number of old log files to keep, *or* frequency of rotation (+daily+,
  #   +weekly+ or +monthly+). Default value is 0, which disables log file
  #   rotation.
  # +shift_size+::
  #   Maximum logfile size in bytes (only applies when +shift_age+ is a positive
  #   Integer). Defaults to +1048576+ (1MB).
  # +level+::
  #   Logging severity threshold. Default values is Logger::DEBUG.
  # +progname+::
  #   Program name to include in log messages. Default value is nil.
  # +formatter+::
  #   Logging formatter. Default values is an instance of Logger::Formatter.
  # +datetime_format+::
  #   Date and time format. Default value is '%Y-%m-%d %H:%M:%S'.
  # +binmode+::
  #   Use binary mode on the log device. Default value is false.
  # +shift_period_suffix+::
  #   The log file suffix format for +daily+, +weekly+ or +monthly+ rotation.
  #   Default is '%Y%m%d'.
  #
  # === Description
  #
  # Create an instance.
  #
  def initialize(logdev, shift_age = 0, shift_size = 1048576, level: DEBUG,
                 progname: nil, formatter: nil, datetime_format: nil,
                 binmode: false, shift_period_suffix: '%Y%m%d')
    self.level = level
    self.progname = progname
    @default_formatter = Formatter.new
    self.datetime_format = datetime_format
    self.formatter = formatter
    @logdev = nil
    if logdev && logdev != File::NULL
      @logdev = LogDevice.new(logdev, shift_age: shift_age,
        shift_size: shift_size,
        shift_period_suffix: shift_period_suffix,
        binmode: binmode)
    end
  end

#
  # :call-seq:
  #   Logger#reopen
  #   Logger#reopen(logdev)
  #
  # === Args
  #
  # +logdev+::
  #   The log device.  This is a filename (String) or IO object (typically
  #   +STDOUT+, +STDERR+, or an open file).  reopen the same filename if
  #   it is +nil+, do nothing for IO.  Default is +nil+.
  #
  # === Description
  #
  # Reopen a log device.
  #
  def reopen(logdev = nil)
    @logdev&.reopen(logdev)
    self
  end

#
  # :call-seq:
  #   Logger#add(severity, message = nil, progname = nil) { ... }
  #
  # === Args
  #
  # +severity+::
  #   Severity.  Constants are defined in Logger namespace: +DEBUG+, +INFO+,
  #   +WARN+, +ERROR+, +FATAL+, or +UNKNOWN+.
  # +message+::
  #   The log message.  A String or Exception.
  # +progname+::
  #   Program name string.  Can be omitted.  Treated as a message if no
  #   +message+ and +block+ are given.
  # +block+::
  #   Can be omitted.  Called to get a message string if +message+ is nil.
  #
  # === Return
  #
  # When the given severity is not high enough (for this particular logger),
  # log no message, and return +true+.
  #
  # === Description
  #
  # Log a message if the given severity is high enough.  This is the generic
  # logging method.  Users will be more inclined to use #debug, #info, #warn,
  # #error, and #fatal.
  #
  # <b>Message format</b>: +message+ can be any object, but it has to be
  # converted to a String in order to log it.  Generally, +inspect+ is used
  # if the given object is not a String.
  # A special case is an +Exception+ object, which will be printed in detail,
  # including message, class, and backtrace.  See #msg2str for the
  # implementation if required.
  #
  # === Bugs
  #
  # * Logfile is not locked.
  # * Append open does not need to lock file.
  # * If the OS supports multi I/O, records possibly may be mixed.
  #
  def add(severity, message = nil, progname = nil)
    severity ||= UNKNOWN
    if @logdev.nil? or severity < level
      return true
    end
    if progname.nil?
      progname = @progname
    end
    if message.nil?
      if block_given?
        message = yield
      else
        message = progname
        progname = @progname
      end
    end
    @logdev.write(
      format_message(format_severity(severity), Time.now, progname, message))
    true
  end
  alias log add

#
  # Dump given message to the log device without any formatting.  If no log
  # device exists, return +nil+.
  #
  def <<(msg)
    @logdev&.write(msg)
  end

#
  # Log a +DEBUG+ message.
  #
  # See #info for more information.
  #
  def debug(progname = nil, &block)
    add(DEBUG, nil, progname, &block)
  end

#
  # :call-seq:
  #   info(message)
  #   info(progname, &block)
  #
  # Log an +INFO+ message.
  #
  # +message+:: The message to log; does not need to be a String.
  # +progname+:: In the block form, this is the #progname to use in the
  #              log message.  The default can be set with #progname=.
  # +block+:: Evaluates to the message to log.  This is not evaluated unless
  #           the logger's level is sufficient to log the message.  This
  #           allows you to create potentially expensive logging messages that
  #           are only called when the logger is configured to show them.
  #
  # === Examples
  #
  #   logger.info("MainApp") { "Received connection from #{ip}" }
  #   # ...
  #   logger.info "Waiting for input from user"
  #   # ...
  #   logger.info { "User typed #{input}" }
  #
  # You'll probably stick to the second form above, unless you want to provide a
  # program name (which you can do with #progname= as well).
  #
  # === Return
  #
  # See #add.
  #
  def info(progname = nil, &block)
    add(INFO, nil, progname, &block)
  end

#
  # Log a +WARN+ message.
  #
  # See #info for more information.
  #
  def warn(progname = nil, &block)
    add(WARN, nil, progname, &block)
  end

#
  # Log an +ERROR+ message.
  #
  # See #info for more information.
  #
  def error(progname = nil, &block)
    add(ERROR, nil, progname, &block)
  end

#
  # Log a +FATAL+ message.
  #
  # See #info for more information.
  #
  def fatal(progname = nil, &block)
    add(FATAL, nil, progname, &block)
  end

#
  # Log an +UNKNOWN+ message.  This will be printed no matter what the logger's
  # level is.
  #
  # See #info for more information.
  #
  def unknown(progname = nil, &block)
    add(UNKNOWN, nil, progname, &block)
  end

#
  # Close the logging device.
  #
  def close
    @logdev&.close
  end

private

# Severity label for logging (max 5 chars).
  SEV_LABEL = %w(DEBUG INFO WARN ERROR FATAL ANY).freeze

def format_severity(severity)
    SEV_LABEL[severity] || 'ANY'
  end

def format_message(severity, datetime, progname, msg)
    (@formatter || @default_formatter).call(severity, datetime, progname, msg)
  end
end

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