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#--
# log.rb -- Log Class
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: log.rb,v 1.26 2002/10/06 17:06:10 gotoyuzo Exp $
module WEBrick
##
# A generic logging class
class BasicLog
# Fatal log level which indicates a server crash
FATAL = 1
# Error log level which indicates a recoverable error
ERROR = 2
# Warning log level which indicates a possible problem
WARN = 3
# Information log level which indicates possibly useful information
INFO = 4
# Debugging error level for messages used in server development or
# debugging
DEBUG = 5
# log-level, messages above this level will be logged
attr_accessor :level
##
# Initializes a new logger for +log_file+ that outputs messages at +level+
# or higher. +log_file+ can be a filename, an IO-like object that
# responds to #<< or nil which outputs to $stderr.
#
# If no level is given INFO is chosen by default
def initialize(log_file=nil, level=nil)
@level = level || INFO
case log_file
when String
@log = open(log_file, "a+")
@log.sync = true
@opened = true
when NilClass
@log = $stderr
else
@log = log_file # requires "<<". (see BasicLog#log)
end
end
##
# Closes the logger (also closes the log device associated to the logger)
def close
@log.close if @opened
@log = nil
end
##
# Logs +data+ at +level+ if the given level is above the current log
# level.
def log(level, data)
if @log && level <= @level
data += "\n" if /\n\Z/ !~ data
@log << data
end
end
##
# Synonym for log(INFO, obj.to_s)
def <<(obj)
log(INFO, obj.to_s)
end
# Shortcut for logging a FATAL message
def fatal(msg) log(FATAL, "FATAL " << format(msg)); end
# Shortcut for logging an ERROR message
def error(msg) log(ERROR, "ERROR " << format(msg)); end
# Shortcut for logging a WARN message
def warn(msg) log(WARN, "WARN " << format(msg)); end
# Shortcut for logging an INFO message
def info(msg) log(INFO, "INFO " << format(msg)); end
# Shortcut for logging a DEBUG message
def debug(msg) log(DEBUG, "DEBUG " << format(msg)); end
# Will the logger output FATAL messages?
def fatal?; @level >= FATAL; end
# Will the logger output ERROR messages?
def error?; @level >= ERROR; end
# Will the logger output WARN messages?
def warn?; @level >= WARN; end
# Will the logger output INFO messages?
def info?; @level >= INFO; end
# Will the logger output DEBUG messages?
def debug?; @level >= DEBUG; end
private
##
# Formats +arg+ for the logger
#
# * If +arg+ is an Exception, it will format the error message and
# the back trace.
# * If +arg+ responds to #to_str, it will return it.
# * Otherwise it will return +arg+.inspect.
def format(arg)
if arg.is_a?(Exception)
"#{arg.class}: #{arg.message}\n\t" <<
arg.backtrace.join("\n\t") << "\n"
elsif arg.respond_to?(:to_str)
arg.to_str
else
arg.inspect
end
end
end
##
# A logging class that prepends a timestamp to each message.
class Log < BasicLog
# Format of the timestamp which is applied to each logged line. The
# default is <tt>"[%Y-%m-%d %H:%M:%S]"</tt>
attr_accessor :time_format
##
# Same as BasicLog#initialize
#
# You can set the timestamp format through #time_format
def initialize(log_file=nil, level=nil)
super(log_file, level)
@time_format = "[%Y-%m-%d %H:%M:%S]"
end
##
# Same as BasicLog#log
def log(level, data)
tmp = Time.now.strftime(@time_format)
tmp << " " << data
super(level, tmp)
end
end
end