Module: Zlog

Extended by:
Zlog
Included in:
Zlog
Defined in:
lib/zlog/zlog.rb

Defined Under Namespace

Modules: Layouts Classes: CLI

Constant Summary collapse

VERSION = 
"0.9.2"

Instance Method Summary collapse

Instance Method Details

#get_writable_logfile(*candidates) ⇒ Object 



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# File 'lib/zlog/zlog.rb', line 29

def get_writable_logfile *candidates
  ret = candidates.compact.find do |f|
    # testing if something is writable, options:
    # #1: discarged, returns false if the file doesn't exist;
    #     it would require to check the folder too... :(
    # File::writable? f
    #2 trial+error
    begin
      File.open(f,"a").close
      true
    rescue
      false
    end
  end
  # in case none of the provided logfiles is writable, create one
  if ret.nil?
    # try to get a prefix as the filename from the first provided log file
    prefix = File::basename( candidates[0].to_s )
    # determine a random filename
    File::join( Dir::tmpdir, Dir::Tmpname.make_tmpname( prefix, nil ) )
  else
    # return the found good filename
    ret
  end
end

#init_stdout(opts = {layout: :simple, loglevel: nil}) ⇒ Object 



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# File 'lib/zlog/zlog.rb', line 8

def init_stdout opts = {layout: :simple, loglevel: nil}
  # determine the layout from options
  layout = case opts[:layout]
    when :named
      Zlog::Layouts.named
    else
      Zlog::Layouts.simple
    end

  # configure the default stdout appender
  Logging.appenders.stdout(
    level: opts[:loglevel],
    layout: layout
  )
  # find all non-stdout appenders
  # this prevents duplicates of stdout appender
  as = Logging.logger.root.appenders.find_all{|i| i.name != "stdout" }
  # add back all appenders + our own stdout appender
  Logging.logger.root.appenders = as + ["stdout"]
end

#json_2_event(str) ⇒ Object 



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# File 'lib/zlog/zlog.rb', line 55

def json_2_event str
  begin
    j = JSON::load str
    # LogEvent = Struct.new( :logger, :level, :data, :time, :file, :line, :method )
    # from: https://github.com/TwP/logging/blob/master/lib/logging/log_event.rb
    # json example:
    # {"timestamp":"2013-10-10T18:37:38.513438+02:00","level":"DEBUG",
    #  "logger":"Log1-debug","message":"debugging info, this won't show up on console"}
    Logging::LogEvent.new( j['logger'], Logging.level_num(j['level']), j['message'].to_s, j['timestamp'] )
  rescue
    nil
  end
end