class Fluent::NewTailInput
Attributes
Public Class Methods
# File lib/fluent/plugin/in_tail.rb, line 22 def initialize super @paths = [] @tails = {} end
Public Instance Methods
Fluent::NewTailInput::TailWatcher#close is called by another thread at shutdown phase. It causes 'can't modify string; temporarily locked' error in IOHandler so adding close_io argument to avoid this problem. At shutdown, IOHandler's io will be released automatically after detached the event loop
# File lib/fluent/plugin/in_tail.rb, line 180 def close_watcher(tw, close_io = true) tw.close(close_io) flush_buffer(tw) if tw.unwatched && @pf @pf[tw.path].update_pos(PositionFile::UNWATCHED_POSITION) end end
# File lib/fluent/plugin/in_tail.rb, line 188 def close_watcher_after_rotate_wait(tw) closer = TailWatcher::Closer.new(@rotate_wait, tw, log, &method(:close_watcher)) closer.attach(@loop) end
# File lib/fluent/plugin/in_tail.rb, line 37 def configure(conf) super @paths = @path.split(',').map {|path| path.strip } if @paths.empty? raise ConfigError, "tail: 'path' parameter is required on tail input" end unless @pos_file $log.warn "'pos_file PATH' parameter is not set to a 'tail' source." $log.warn "this parameter is highly recommended to save the position to resume tailing." end configure_parser(conf) configure_tag @multiline_mode = conf['format'] =~ /multiline/ @receive_handler = if @multiline_mode method(:parse_multilines) else method(:parse_singleline) end end
# File lib/fluent/plugin/in_tail.rb, line 61 def configure_parser(conf) @parser = Plugin.new_parser(conf['format']) @parser.configure(conf) end
# File lib/fluent/plugin/in_tail.rb, line 66 def configure_tag if @tag.index('*') @tag_prefix, @tag_suffix = @tag.split('*') @tag_suffix ||= '' else @tag_prefix = nil @tag_suffix = nil end end
# File lib/fluent/plugin/in_tail.rb, line 234 def convert_line_to_event(line, es) begin line.chomp! # remove \n @parser.parse(line) { |time, record| if time && record es.add(time, record) else log.warn "pattern not match: #{line.inspect}" end } rescue => e log.warn line.dump, :error => e.to_s log.debug_backtrace(e.backtrace) end end
# File lib/fluent/plugin/in_tail.rb, line 100 def expand_paths date = Time.now paths = [] @paths.each { |path| path = date.strftime(path) if path.include?('*') paths += Dir.glob(path) else # When file is not created yet, Dir.glob returns an empty array. So just add when path is static. paths << path end } paths end
# File lib/fluent/plugin/in_tail.rb, line 193 def flush_buffer(tw) if lb = tw.line_buffer lb.chomp! @parser.parse(lb) { |time, record| if time && record tag = if @tag_prefix || @tag_suffix @tag_prefix + tw.tag + @tag_suffix else @tag end router.emit(tag, time, record) else log.warn "got incomplete line at shutdown from #{tw.path}: #{lb.inspect}" end } end end
# File lib/fluent/plugin/in_tail.rb, line 258 def parse_multilines(lines, tail_watcher) lb = tail_watcher.line_buffer es = MultiEventStream.new if @parser.has_firstline? lines.each { |line| if @parser.firstline?(line) if lb convert_line_to_event(lb, es) end lb = line else if lb.nil? log.warn "got incomplete line before first line from #{tail_watcher.path}: #{line.inspect}" else lb << line end end } else lb ||= '' lines.each do |line| lb << line @parser.parse(lb) { |time, record| if time && record convert_line_to_event(lb, es) lb = '' end } end end tail_watcher.line_buffer = lb es end
# File lib/fluent/plugin/in_tail.rb, line 250 def parse_singleline(lines, tail_watcher) es = MultiEventStream.new lines.each { |line| convert_line_to_event(line, es) } es end
# File lib/fluent/plugin/in_tail.rb, line 218 def receive_lines(lines, tail_watcher) es = @receive_handler.call(lines, tail_watcher) unless es.empty? tag = if @tag_prefix || @tag_suffix @tag_prefix + tail_watcher.tag + @tag_suffix else @tag end begin router.emit_stream(tag, es) rescue # ignore errors. Engine shows logs and backtraces. end end end
in_tail with '*' path doesn't check rotation file equality at refresh phase. So you should not use '*' path when your logs will be rotated by another tool. It will cause log duplication after updated watch files. In such case, you should separate log directory and specify two paths in path parameter. e.g. path /path/to/dir/*,/path/to/rotated_logs/target_file
# File lib/fluent/plugin/in_tail.rb, line 120 def refresh_watchers target_paths = expand_paths existence_paths = @tails.keys unwatched = existence_paths - target_paths added = target_paths - existence_paths stop_watchers(unwatched, false, true) unless unwatched.empty? start_watchers(added) unless added.empty? end
# File lib/fluent/plugin/in_tail.rb, line 211 def run @loop.run rescue log.error "unexpected error", :error=>$!.to_s log.error_backtrace end
# File lib/fluent/plugin/in_tail.rb, line 131 def setup_watcher(path, pe) tw = TailWatcher.new(path, @rotate_wait, pe, log, @read_from_head, method(:update_watcher), &method(:receive_lines)) tw.attach(@loop) tw end
# File lib/fluent/plugin/in_tail.rb, line 91 def shutdown @refresh_trigger.detach if @refresh_trigger && @refresh_trigger.attached? stop_watchers(@tails.keys, true) @loop.stop rescue nil # when all watchers are detached, `stop` raises RuntimeError. We can ignore this exception. @thread.join @pf_file.close if @pf_file end
# File lib/fluent/plugin/in_tail.rb, line 76 def start if @pos_file @pf_file = File.open(@pos_file, File::RDWR|File::CREAT, DEFAULT_FILE_PERMISSION) @pf_file.sync = true @pf = PositionFile.parse(@pf_file) end @loop = Coolio::Loop.new refresh_watchers @refresh_trigger = TailWatcher::TimerWatcher.new(@refresh_interval, true, log, &method(:refresh_watchers)) @refresh_trigger.attach(@loop) @thread = Thread.new(&method(:run)) end
# File lib/fluent/plugin/in_tail.rb, line 137 def start_watchers(paths) paths.each { |path| pe = nil if @pf pe = @pf[path] if @read_from_head && pe.read_inode.zero? begin pe.update(File::Stat.new(path).ino, 0) rescue Errno::ENOENT $log.warn "#{path} not found. Continuing without tailing it." end end end @tails[path] = setup_watcher(path, pe) } end
# File lib/fluent/plugin/in_tail.rb, line 155 def stop_watchers(paths, immediate = false, unwatched = false) paths.each { |path| tw = @tails.delete(path) if tw tw.unwatched = unwatched if immediate close_watcher(tw, false) else close_watcher_after_rotate_wait(tw) end end } end
#refresh_watchers calls @tails.keys so we don't use stop_watcher -> start_watcher sequence for safety.
# File lib/fluent/plugin/in_tail.rb, line 170 def update_watcher(path, pe) rotated_tw = @tails[path] @tails[path] = setup_watcher(path, pe) close_watcher_after_rotate_wait(rotated_tw) if rotated_tw end