buffered_logger

ABOUT

The 'buffered_logger' gem is an extension to ActiveSupport::BufferedLogger which gives the the little logger some much needed formatting support. The actual logging work is still delegated to to active_support/buffered_logger.

FEATURES

• per thread indentation
• per thread auto flush setting
• temporary indentation blocks
• per severity formatting
• ansi color output formats

USAGE

default initialization

l = BufferedLogger.new(STDOUT)

changing the severity level

l.level = :warn l.level = 1

formatter constructor (initializes the master thread's formatters)

l = BufferedLogger.new(STDOUT, :debug,
{ :info => "$green INFO: $white %s", :warn => "$yellow WARNING: $white %s", :error => "$red ERROR: $white %s" } )

setting formatting after initialization

l.info_formatter = "$green INFO: $white %s",
l.warn_formatter = "$yellow WARNING: $white %s" l.error_formatter = "$red ERROR: $white %s"

checking the current thread's formatting

l.info_formatter.to_s l.warn_formatter.to_s ...

checking the current thread's indentation

l.padding.to_s

setting the current thread's indentation

l.indent(4) # move cursor right 4 spaces l.indent(-2) # move cursor left 2 spaces l.indent(:reset) # reset indentation

temporarily indenting using an indent block

l.indent do l.info 'some info' ... l.info 'some more info' end

setting auto_flushing

l.auto_flushing = 2

USAGE DETAILS

• Severity Levels

  • severity level is optional and defaults to :debug
  • severity level can be provided as an Integer or Symbol 0 - DEBUG 1 - INFO 2 - WARN 3 - ERROR 4 - FATAL 5 - UNKNOWN

• ActiveSupport::BufferedLogger

  • native buffered_logger functionality is preserved $ ActiveSupport::BufferedLogger.public_instance_methods(false) => ["add", "info", "fatal?", "auto_flushing", "fatal", "silencer", "debug", "info?", "warn?", "auto_flushing=", "silencer=", "level", "error?", "unknown", "debug?", "flush", "level=", "open_log", "warn", "unknown?", "silence", "error", "close"]

• ANSI Color

  • colors are only supported when logging to STDOUT
  • any ansi method may be used in a format string following a '$' symbol $ Term::ANSIColor.instance_methods => ["black", "on_yellow", "underscore", "rapid_blink", "white", "bold", "yellow", "on_cyan", "strikethrough", "on_green", "uncolored", "blink", "cyan", "reset", "green", "on_magenta", "clear", "concealed", "on_red", "dark", "underline", "magenta", "red", "on_blue", "negative", "on_black", "italic", "blue", "on_white"]

• Indentation

  • the padding is calculated on a per thread basis and each thread has an indentation counter which is shared across all severity levels

• Formatting

  • formatters are set on a per thread/per severity basis, meaning that every severity level for every thread allows for a custom formatter
  • the formatter search order is as follows
    1. current thread's formatter for specified severity
    2. master thread's formatter for specified severity
    3. master thread's default formatter

• Thread Buffering

  • the auto_flushing setting is set per thread and each thread defaults to the autoflush setting of the master thread unless explicitly configured