Inspired by the buffered logger idea by Ezra
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MAX_BUFFER_SIZE | = | 1000 |
[R] | auto_flushing | |
[RW] | level |
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# File activesupport/lib/active_support/buffered_logger.rb, line 42 def initialize(log, level = DEBUG) @level = level @buffer = Hash.new { |h,k| h[k] = [] } @auto_flushing = 1 @guard = Mutex.new if log.respond_to?(:write) @log = log elsif File.exist?(log) @log = open_log(log, (File::WRONLY | File::APPEND)) else FileUtils.mkdir_p(File.dirname(log)) @log = open_log(log, (File::WRONLY | File::APPEND | File::CREAT)) end end
Set to false to disable the silencer
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# File activesupport/lib/active_support/buffered_logger.rb, line 22 cattr_accessor :silencer
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# File activesupport/lib/active_support/buffered_logger.rb, line 65 def add(severity, message = nil, progname = nil, &block) return if @level > severity message = (message || (block && block.call) || progname).to_s # If a newline is necessary then create a new message ending with a newline. # Ensures that the original message is not mutated. message = "#{message}\n" unless message[-1] == \n\ buffer << message auto_flush message end
Set the auto-flush period. Set to true to flush after every log message, to an integer to flush every N messages, or to false, nil, or zero to never auto-flush. If you turn auto-flushing off, be sure to regularly flush the log yourself – it will eat up memory until you do.
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# File activesupport/lib/active_support/buffered_logger.rb, line 96 def auto_flushing=(period) @auto_flushing = case period when true; 1 when false, nil, 0; MAX_BUFFER_SIZE when Integer; period else raise ArgumentError, "Unrecognized auto_flushing period: #{period.inspect}" end end
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# File activesupport/lib/active_support/buffered_logger.rb, line 118 def close flush @log.close if @log.respond_to?(:close) @log = nil end
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# File activesupport/lib/active_support/buffered_logger.rb, line 106 def flush @guard.synchronize do buffer.each do |content| @log.write(content) end # Important to do this even if buffer was empty or else @buffer will # accumulate empty arrays for each request where nothing was logged. clear_buffer end end
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# File activesupport/lib/active_support/buffered_logger.rb, line 58 def open_log(log, mode) open(log, mode).tap do |open_log| open_log.set_encoding(Encoding::BINARY) if open_log.respond_to?(:set_encoding) open_log.sync = true end end
Silences the logger for the duration of the block.
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# File activesupport/lib/active_support/buffered_logger.rb, line 26 def silence(temporary_level = ERROR) if silencer begin old_logger_level, self.level = level, temporary_level yield self ensure self.level = old_logger_level end else yield self end end
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# File activesupport/lib/active_support/buffered_logger.rb, line 125 def auto_flush flush if buffer.size >= @auto_flushing end
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# File activesupport/lib/active_support/buffered_logger.rb, line 129 def buffer @buffer[Thread.current] end
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# File activesupport/lib/active_support/buffered_logger.rb, line 133 def clear_buffer @buffer.delete(Thread.current) end