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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Christopher Brown (<cb@opscode.com>)
# Copyright:: Copyright (c) 2008 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'logger'
require 'mixlib/log/version'
require 'mixlib/log/formatter'
module Mixlib
module Log
@logger, @loggers = nil
LEVELS = { :debug=>Logger::DEBUG, :info=>Logger::INFO, :warn=>Logger::WARN, :error=>Logger::ERROR, :fatal=>Logger::FATAL}.freeze
LEVEL_NAMES = LEVELS.invert.freeze
def reset!
@logger, @loggers = nil, nil
end
# An Array of log devices that will be logged to. Defaults to just the default
# @logger log device, but you can push to this array to add more devices.
def loggers
@loggers ||= [logger]
end
##
# init always returns a configured logger
# and creates a new one if it doesn't yet exist
##
def logger
@logger || init
end
# Sets the log device to +new_log_device+. Any additional loggers
# that had been added to the +loggers+ array will be cleared.
def logger=(new_log_device)
reset!
@logger=new_log_device
end
def use_log_devices(other)
if other.respond_to?(:loggers) && other.respond_to?(:logger)
@loggers = other.loggers
@logger = other.logger
elsif other.kind_of?(Array)
@loggers = other
@logger = other.first
else
msg = "#use_log_devices takes a Mixlib::Log object or array of log devices. " <<
"You gave: #{other.inspect}"
raise ArgumentError, msg
end
end
# Use Mixlib::Log.init when you want to set up the logger manually. Arguments to this method
# get passed directly to Logger.new, so check out the documentation for the standard Logger class
# to understand what to do here.
#
# If this method is called with no arguments, it will log to STDOUT at the :warn level.
#
# It also configures the Logger instance it creates to use the custom Mixlib::Log::Formatter class.
def init(*opts)
reset!
@logger = logger_for(*opts)
@logger.formatter = Mixlib::Log::Formatter.new() if @logger.respond_to?(:formatter=)
@logger.level = Logger::WARN
@logger
end
# Sets the level for the Logger object by symbol. Valid arguments are:
#
# :debug
# :info
# :warn
# :error
# :fatal
#
# Throws an ArgumentError if you feed it a bogus log level.
def level=(new_level)
level_int = LEVEL_NAMES.key?(new_level) ? new_level : LEVELS[new_level]
raise ArgumentError, "Log level must be one of :debug, :info, :warn, :error, or :fatal" if level_int.nil?
loggers.each {|l| l.level = level_int }
end
def level(new_level=nil)
if new_level.nil?
LEVEL_NAMES[logger.level]
else
self.level=(new_level)
end
end
# Define the standard logger methods on this class programmatically.
# No need to incur method_missing overhead on every log call.
[:debug, :info, :warn, :error, :fatal].each do |method_name|
class_eval(<<-METHOD_DEFN, __FILE__, __LINE__)
def #{method_name}(msg=nil, &block)
loggers.each {|l| l.#{method_name}(msg, &block) }
end
METHOD_DEFN
end
# Define the methods to interrogate the logger for the current log level.
# Note that we *only* query the default logger (@logger) and not any other
# loggers that may have been added, even though it is possible to configure
# two (or more) loggers at different log levels.
[:debug?, :info?, :warn?, :error?, :fatal?].each do |method_name|
class_eval(<<-METHOD_DEFN, __FILE__, __LINE__)
def #{method_name}
logger.#{method_name}
end
METHOD_DEFN
end
def <<(msg)
loggers.each {|l| l << msg }
end
def add(severity, message = nil, progname = nil, &block)
loggers.each {|l| l.add(severity, message = nil, progname = nil, &block) }
end
alias :log :add
# Passes any other method calls on directly to the underlying Logger object created with init. If
# this method gets hit before a call to Mixlib::Logger.init has been made, it will call
# Mixlib::Logger.init() with no arguments.
def method_missing(method_symbol, *args, &block)
loggers.each {|l| l.send(method_symbol, *args, &block) }
end
private
def logger_for(*opts)
if opts.empty?
Logger.new(STDOUT)
elsif LEVELS.keys.inject(true) {|quacks, level| quacks && opts.first.respond_to?(level)}
opts.first
else
Logger.new(*opts)
end
end
end
end
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