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Contents
# frozen_string_literal: true
module Vedeu
module Logging
# Ensures we can always write to the log file by creating a
# lock-less log device.
#
# @api private
#
class LocklessLogDevice < ::Logger::LogDevice
# Returns a new instance of Vedeu::Logging::LocklessLogDevice.
#
# @param log [void]
# @return [Vedeu::Logging::LocklessLogDevice]
def initialize(log = nil)
@filename = nil
@log = log
if writable? && closeable?
@dev = log
else
@dev = open_logfile(log)
@dev.sync = true
@filename = log
end
end
# @param message [String]
# @return [void]
def write(message)
@dev.write(message)
rescue StandardError => exception
warn("log writing failed. #{exception}")
end
# @return [void]
def close
@dev.close
rescue
nil
end
protected
# @!attribute [r] log
# @return [String]
attr_reader :log
private
# @return [Boolean]
def closable?
log.respond_to?(:close)
end
# @param log [String]
# @return [void]
def open_logfile(log)
if FileTest.exist?(log)
open(log, (File::WRONLY | File::APPEND))
else
logdev = open(log, (File::WRONLY | File::APPEND | File::CREAT))
logdev.sync = true
logdev
end
end
# @return [Boolean]
def writable?
log.respond_to?(:write)
end
end # LocklessLogDevice
end # Logging
end # Vedeu
Version data entries
22 entries across 22 versions & 1 rubygems