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module Net
module SSH
# A simple module to make logging easier to deal with. It assumes that the
# logger instance (if not nil) quacks like a Logger object (in Ruby's
# standard library). Although used primarily internally by Net::SSH, it
# can easily be used to add Net::SSH-like logging to your own programs.
#
# class MyClass
# include Net::SSH::Loggable
# end
#
# Net::SSH.start(...) do |ssh|
# obj = MyClass.new
# obj.logger = ssh.logger
# ...
# end
module Loggable
# The logger instance that will be used to log messages. If nil, nothing
# will be logged.
attr_accessor :logger
# Displays the result of yielding if the log level is Logger::DEBUG or
# greater.
def debug
logger.add(Logger::DEBUG, nil, facility) { yield } if logger && logger.debug?
end
# Displays the result of yielding if the log level is Logger::INFO or
# greater.
def info
logger.add(Logger::INFO, nil, facility) { yield } if logger && logger.info?
end
# Displays the result of yielding if the log level is Logger::WARN or
# greater. (Called lwarn to avoid shadowing with Kernel#warn.)
def lwarn
logger.add(Logger::WARN, nil, facility) { yield } if logger && logger.warn?
end
# Displays the result of yielding if the log level is Logger:ERROR or
# greater.
def error
logger.add(Logger::ERROR, nil, facility) { yield } if logger && logger.error?
end
# Displays the result of yielding if the log level is Logger::FATAL or
# greater.
def fatal
logger.add(Logger::FATAL, nil, facility) { yield } if logger && logger.fatal?
end
private
# Sets the "facility" value, used for reporting where a log message
# originates. It defaults to the name of class with the object_id
# appended.
def facility
@facility ||= self.class.name.gsub(/::/, ".").gsub(/([a-z])([A-Z])/, "\\1_\\2").downcase + "[%x]" % object_id
end
end
end; end
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