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Edit File : log_device.rb \| Size : 5.64 KB
# frozen_string_literal: true require_relative 'period' class Logger # Device used for logging messages. class LogDevice include Period attr_reader :dev attr_reader :filename include MonitorMixin def initialize(log = nil, shift_age: nil, shift_size: nil, shift_period_suffix: nil, binmode: false) @dev = @filename = @shift_age = @shift_size = @shift_period_suffix = nil @binmode = binmode mon_initialize set_dev(log) if @filename @shift_age = shift_age \|\| 7 @shift_size = shift_size \|\| 1048576 @shift_period_suffix = shift_period_suffix \|\| '%Y%m%d' unless @shift_age.is_a?(Integer) base_time = @dev.respond_to?(:stat) ? @dev.stat.mtime : Time.now @next_rotate_time = next_rotate_time(base_time, @shift_age) end end end def write(message) begin synchronize do if @shift_age and @dev.respond_to?(:stat) begin check_shift_log rescue warn("log shifting failed. #{$!}") end end begin @dev.write(message) rescue warn("log writing failed. #{$!}") end end rescue Exception => ignored warn("log writing failed. #{ignored}") end end def close begin synchronize do @dev.close rescue nil end rescue Exception @dev.close rescue nil end end def reopen(log = nil) # reopen the same filename if no argument, do nothing for IO log \|\|= @filename if @filename if log synchronize do if @filename and @dev @dev.close rescue nil # close only file opened by Logger @filename = nil end set_dev(log) end end self end private def set_dev(log) if log.respond_to?(:write) and log.respond_to?(:close) @dev = log if log.respond_to?(:path) and path = log.path if File.exist?(path) @filename = path end end else @dev = open_logfile(log) @dev.sync = true @dev.binmode if @binmode @filename = log end end def open_logfile(filename) begin File.open(filename, (File::WRONLY \| File::APPEND)) rescue Errno::ENOENT create_logfile(filename) end end def create_logfile(filename) begin logdev = File.open(filename, (File::WRONLY \| File::APPEND \| File::CREAT \| File::EXCL)) logdev.flock(File::LOCK_EX) logdev.sync = true logdev.binmode if @binmode add_log_header(logdev) logdev.flock(File::LOCK_UN) rescue Errno::EEXIST # file is created by another process logdev = open_logfile(filename) logdev.sync = true end logdev end def add_log_header(file) file.write( "# Logfile created on %s by %s\n" % [Time.now.to_s, Logger::ProgName] ) if file.size == 0 end def check_shift_log if @shift_age.is_a?(Integer) # Note: always returns false if '0'. if @filename && (@shift_age > 0) && (@dev.stat.size > @shift_size) lock_shift_log { shift_log_age } end else now = Time.now if now >= @next_rotate_time @next_rotate_time = next_rotate_time(now, @shift_age) lock_shift_log { shift_log_period(previous_period_end(now, @shift_age)) } end end end if /mswin\|mingw\|cygwin/ =~ RbConfig::CONFIG['host_os'] def lock_shift_log yield end else def lock_shift_log retry_limit = 8 retry_sleep = 0.1 begin File.open(@filename, File::WRONLY \| File::APPEND) do \|lock\| lock.flock(File::LOCK_EX) # inter-process locking. will be unlocked at closing file if File.identical?(@filename, lock) and File.identical?(lock, @dev) yield # log shifting else # log shifted by another process (i-node before locking and i-node after locking are different) @dev.close rescue nil @dev = open_logfile(@filename) @dev.sync = true end end rescue Errno::ENOENT # @filename file would not exist right after #rename and before #create_logfile if retry_limit <= 0 warn("log rotation inter-process lock failed. #{$!}") else sleep retry_sleep retry_limit -= 1 retry_sleep *= 2 retry end end rescue warn("log rotation inter-process lock failed. #{$!}") end end def shift_log_age (@shift_age-3).downto(0) do \|i\| if FileTest.exist?("#{@filename}.#{i}") File.rename("#{@filename}.#{i}", "#{@filename}.#{i+1}") end end @dev.close rescue nil File.rename("#{@filename}", "#{@filename}.0") @dev = create_logfile(@filename) return true end def shift_log_period(period_end) suffix = period_end.strftime(@shift_period_suffix) age_file = "#{@filename}.#{suffix}" if FileTest.exist?(age_file) # try to avoid filename crash caused by Timestamp change. idx = 0 # .99 can be overridden; avoid too much file search with 'loop do' while idx < 100 idx += 1 age_file = "#{@filename}.#{suffix}.#{idx}" break unless FileTest.exist?(age_file) end end @dev.close rescue nil File.rename("#{@filename}", age_file) @dev = create_logfile(@filename) return true end end end Back

Edit File : log_device.rb | Size : 5.64 KB

# frozen_string_literal: true

require_relative 'period'

class Logger
  # Device used for logging messages.
  class LogDevice
    include Period

attr_reader :dev
    attr_reader :filename
    include MonitorMixin

def initialize(log = nil, shift_age: nil, shift_size: nil, shift_period_suffix: nil, binmode: false)
      @dev = @filename = @shift_age = @shift_size = @shift_period_suffix = nil
      @binmode = binmode
      mon_initialize
      set_dev(log)
      if @filename
        @shift_age = shift_age || 7
        @shift_size = shift_size || 1048576
        @shift_period_suffix = shift_period_suffix || '%Y%m%d'

unless @shift_age.is_a?(Integer)
          base_time = @dev.respond_to?(:stat) ? @dev.stat.mtime : Time.now
          @next_rotate_time = next_rotate_time(base_time, @shift_age)
        end
      end
    end

def write(message)
      begin
        synchronize do
          if @shift_age and @dev.respond_to?(:stat)
            begin
              check_shift_log
            rescue
              warn("log shifting failed. #{$!}")
            end
          end
          begin
            @dev.write(message)
          rescue
            warn("log writing failed. #{$!}")
          end
        end
      rescue Exception => ignored
        warn("log writing failed. #{ignored}")
      end
    end

def close
      begin
        synchronize do
          @dev.close rescue nil
        end
      rescue Exception
        @dev.close rescue nil
      end
    end

def reopen(log = nil)
      # reopen the same filename if no argument, do nothing for IO
      log ||= @filename if @filename
      if log
        synchronize do
          if @filename and @dev
            @dev.close rescue nil # close only file opened by Logger
            @filename = nil
          end
          set_dev(log)
        end
      end
      self
    end

private

def set_dev(log)
      if log.respond_to?(:write) and log.respond_to?(:close)
        @dev = log
        if log.respond_to?(:path) and path = log.path
          if File.exist?(path)
            @filename = path
          end
        end
      else
        @dev = open_logfile(log)
        @dev.sync = true
        @dev.binmode if @binmode
        @filename = log
      end
    end

def open_logfile(filename)
      begin
        File.open(filename, (File::WRONLY | File::APPEND))
      rescue Errno::ENOENT
        create_logfile(filename)
      end
    end

def create_logfile(filename)
      begin
        logdev = File.open(filename, (File::WRONLY | File::APPEND | File::CREAT | File::EXCL))
        logdev.flock(File::LOCK_EX)
        logdev.sync = true
        logdev.binmode if @binmode
        add_log_header(logdev)
        logdev.flock(File::LOCK_UN)
      rescue Errno::EEXIST
        # file is created by another process
        logdev = open_logfile(filename)
        logdev.sync = true
      end
      logdev
    end

def add_log_header(file)
      file.write(
        "# Logfile created on %s by %s\n" % [Time.now.to_s, Logger::ProgName]
      ) if file.size == 0
    end

def check_shift_log
      if @shift_age.is_a?(Integer)
        # Note: always returns false if '0'.
        if @filename && (@shift_age > 0) && (@dev.stat.size > @shift_size)
          lock_shift_log { shift_log_age }
        end
      else
        now = Time.now
        if now >= @next_rotate_time
          @next_rotate_time = next_rotate_time(now, @shift_age)
          lock_shift_log { shift_log_period(previous_period_end(now, @shift_age)) }
        end
      end
    end

if /mswin|mingw|cygwin/ =~ RbConfig::CONFIG['host_os']
      def lock_shift_log
        yield
      end
    else
      def lock_shift_log
        retry_limit = 8
        retry_sleep = 0.1
        begin
          File.open(@filename, File::WRONLY | File::APPEND) do |lock|
            lock.flock(File::LOCK_EX) # inter-process locking. will be unlocked at closing file
            if File.identical?(@filename, lock) and File.identical?(lock, @dev)
              yield # log shifting
            else
              # log shifted by another process (i-node before locking and i-node after locking are different)
              @dev.close rescue nil
              @dev = open_logfile(@filename)
              @dev.sync = true
            end
          end
        rescue Errno::ENOENT
          # @filename file would not exist right after #rename and before #create_logfile
          if retry_limit <= 0
            warn("log rotation inter-process lock failed. #{$!}")
          else
            sleep retry_sleep
            retry_limit -= 1
            retry_sleep *= 2
            retry
          end
        end
      rescue
        warn("log rotation inter-process lock failed. #{$!}")
      end
    end

def shift_log_age
      (@shift_age-3).downto(0) do |i|
        if FileTest.exist?("#{@filename}.#{i}")
          File.rename("#{@filename}.#{i}", "#{@filename}.#{i+1}")
        end
      end
      @dev.close rescue nil
      File.rename("#{@filename}", "#{@filename}.0")
      @dev = create_logfile(@filename)
      return true
    end

def shift_log_period(period_end)
      suffix = period_end.strftime(@shift_period_suffix)
      age_file = "#{@filename}.#{suffix}"
      if FileTest.exist?(age_file)
        # try to avoid filename crash caused by Timestamp change.
        idx = 0
        # .99 can be overridden; avoid too much file search with 'loop do'
        while idx < 100
          idx += 1
          age_file = "#{@filename}.#{suffix}.#{idx}"
          break unless FileTest.exist?(age_file)
        end
      end
      @dev.close rescue nil
      File.rename("#{@filename}", age_file)
      @dev = create_logfile(@filename)
      return true
    end
  end
end

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