JezK
Edit File: datefileoutputter.rb
# = DateFileOutputter # # Subclass of FileOutputter that changes the log file daily. When a new # day begins, a new file is created with the date included in the name. # # == Usage # # df_out = DateFileOutputter.new('name', # :dirname="/tmp", :date_pattern=>"%m-%d" # ) # # == Rate of Change # # A new logfile is created whenever the current time as formatted by the date # pattern no longer matches the previous time. (This is a simple String # comparison.) So, in order to change the frequency of the rollover, just # alter the date pattern to match how fast the files should be generated. # For instance, to generate files by the minute, # # df_out.date_pattern = "%M" # # This causes the following files to show up one minute apart, asuming the # script starts at the 4th minute of the hour: # # file_04.rb # file_05.rb # file_06.rb # ... # # The only limitation of this approach is that the precise time cannot be # recorded as the smallest time interval equals the rollover period for this # system. require "log4r/outputter/fileoutputter" require "log4r/staticlogger" module Log4r # Additional hash arguments are: # # [<tt>:dirname</tt>] Directory of the log file # [<tt>:date_pattern</tt>] Time.strftime format string (default is "%Y-%m-%d") class DateFileOutputter < FileOutputter DEFAULT_DATE_FMT = "%Y-%m-%d" def initialize(_name, hash={}) @DatePattern = (hash[:date_pattern] or hash['date_pattern'] or DEFAULT_DATE_FMT) @DateStamp = Time.now.strftime( @DatePattern); _dirname = (hash[:dirname] or hash['dirname']) # hash[:dirname] masks hash[:filename] if _dirname if not FileTest.directory?( _dirname) raise StandardError, "'#{_dirname}' must be a valid directory", caller end end _filename = (hash[:filename] or hash['filename']) if _filename.nil? @filebase = File.basename( $0, '.rb') + ".log" else @filebase = File.basename((hash[:filename] or hash['filename'] or "")) end # Get rid of the 'nil' in the path path = [_dirname, @filebase.sub(/(\.\w*)$/, "_#{@DateStamp}" + '\1')].compact hash[:filename] = hash['filename'] = File.join(path) super(_name, hash) end ####### private ####### # perform the write def write(data) change if requiresChange super end # construct a new filename from the DateStamp def makeNewFilename @DateStamp = Time.now.strftime( @DatePattern); @filename = File.join(File.dirname(@filename), @filebase.sub(/(\.\w*)$/, "_#{@DateStamp}" + '\1')) end # does the file require a change? def requiresChange _DateStamp = Time.now.strftime( @DatePattern); if not _DateStamp == @DateStamp @DateStamp = _DateStamp return true end false end # change the file def change begin @out.close rescue Logger.log_internal { "DateFileOutputter '#{@name}' could not close #{@filename}" } end makeNewFilename @out = File.new(@filename, (@trunc ? "w" : "a")) Logger.log_internal { "DateFileOutputter '#{@name}' now writing to #{@filename}" } end end end