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# frozen_string_literal: false
require 'syslog'
require 'logger'
##
# Syslog::Logger is a Logger work-alike that logs via syslog instead of to a
# file. You can use Syslog::Logger to aggregate logs between multiple
# machines.
#
# By default, Syslog::Logger uses the program name 'ruby', but this can be
# changed via the first argument to Syslog::Logger.new.
#
# NOTE! You can only set the Syslog::Logger program name when you initialize
# Syslog::Logger for the first time. This is a limitation of the way
# Syslog::Logger uses syslog (and in some ways, a limitation of the way
# syslog(3) works). Attempts to change Syslog::Logger's program name after
# the first initialization will be ignored.
#
# === Example
#
# The following will log to syslogd on your local machine:
#
# require 'syslog/logger'
#
# log = Syslog::Logger.new 'my_program'
# log.info 'this line will be logged via syslog(3)'
#
# Also the facility may be set to specify the facility level which will be used:
#
# log.info 'this line will be logged using Syslog default facility level'
#
# log_local1 = Syslog::Logger.new 'my_program', Syslog::LOG_LOCAL1
# log_local1.info 'this line will be logged using local1 facility level'
#
#
# You may need to perform some syslog.conf setup first. For a BSD machine add
# the following lines to /etc/syslog.conf:
#
# !my_program
# *.* /var/log/my_program.log
#
# Then touch /var/log/my_program.log and signal syslogd with a HUP
# (killall -HUP syslogd, on FreeBSD).
#
# If you wish to have logs automatically roll over and archive, see the
# newsyslog.conf(5) and newsyslog(8) man pages.
class Syslog::Logger
# Default formatter for log messages.
class Formatter
def call severity, time, progname, msg
clean msg
end
private
##
# Clean up messages so they're nice and pretty.
def clean message
message = message.to_s.strip
message.gsub!(/\e\[[0-9;]*m/, '') # remove useless ansi color codes
return message
end
end
##
# The version of Syslog::Logger you are using.
VERSION = '2.1.0'
##
# Maps Logger warning types to syslog(3) warning types.
#
# Messages from Ruby applications are not considered as critical as messages
# from other system daemons using syslog(3), so most messages are reduced by
# one level. For example, a fatal message for Ruby's Logger is considered
# an error for syslog(3).
LEVEL_MAP = {
::Logger::UNKNOWN => Syslog::LOG_ALERT,
::Logger::FATAL => Syslog::LOG_ERR,
::Logger::ERROR => Syslog::LOG_WARNING,
::Logger::WARN => Syslog::LOG_NOTICE,
::Logger::INFO => Syslog::LOG_INFO,
::Logger::DEBUG => Syslog::LOG_DEBUG,
}
##
# Returns the internal Syslog object that is initialized when the
# first instance is created.
def self.syslog
@@syslog
end
##
# Specifies the internal Syslog object to be used.
def self.syslog= syslog
@@syslog = syslog
end
##
# Builds a methods for level +meth+.
def self.make_methods meth
level = ::Logger.const_get(meth.upcase)
eval <<-EOM, nil, __FILE__, __LINE__ + 1
def #{meth}(message = nil, &block)
add(#{level}, message, &block)
end
def #{meth}?
level <= #{level}
end
EOM
end
##
# :method: unknown
#
# Logs a +message+ at the unknown (syslog alert) log level, or logs the
# message returned from the block.
##
# :method: fatal
#
# Logs a +message+ at the fatal (syslog err) log level, or logs the message
# returned from the block.
##
# :method: error
#
# Logs a +message+ at the error (syslog warning) log level, or logs the
# message returned from the block.
##
# :method: warn
#
# Logs a +message+ at the warn (syslog notice) log level, or logs the
# message returned from the block.
##
# :method: info
#
# Logs a +message+ at the info (syslog info) log level, or logs the message
# returned from the block.
##
# :method: debug
#
# Logs a +message+ at the debug (syslog debug) log level, or logs the
# message returned from the block.
Logger::Severity::constants.each do |severity|
make_methods severity.downcase
end
##
# Log level for Logger compatibility.
attr_accessor :level
# 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
##
# The facility argument is used to specify what type of program is logging the message.
attr_accessor :facility
##
# Fills in variables for Logger compatibility. If this is the first
# instance of Syslog::Logger, +program_name+ may be set to change the logged
# program name. The +facility+ may be set to specify the facility level which will be used.
#
# Due to the way syslog works, only one program name may be chosen.
def initialize program_name = 'ruby', facility = nil
@level = ::Logger::DEBUG
@formatter = Formatter.new
@@syslog ||= Syslog.open(program_name)
@facility = (facility || @@syslog.facility)
end
##
# Almost duplicates Logger#add. +progname+ is ignored.
def add severity, message = nil, progname = nil, &block
severity ||= ::Logger::UNKNOWN
level <= severity and
@@syslog.log( (LEVEL_MAP[severity] | @facility), '%s', formatter.call(severity, Time.now, progname, (message || block.call)) )
true
end
end
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