Class: FileWatch::ReadMode::Processor

Inherits:
Object
  • Object
show all
Includes:
LogStash::Util::Loggable
Defined in:
lib/filewatch/read_mode/processor.rb

Overview

Must handle

:read_file
:read_zip_file

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(settings) ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/filewatch/read_mode/processor.rb', line 17

def initialize(settings)
  @settings = settings
  @deletable_filepaths = []
end

Instance Attribute Details

#deletable_filepaths ⇒ Object (readonly)

Returns the value of attribute deletable_filepaths.



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# File 'lib/filewatch/read_mode/processor.rb', line 15

def deletable_filepaths
  @deletable_filepaths
end

#watch ⇒ Object (readonly)

Returns the value of attribute watch.



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# File 'lib/filewatch/read_mode/processor.rb', line 15

def watch
  @watch
end

Instance Method Details

#add_watch(watch) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 22

def add_watch(watch)
  @watch = watch
  self
end

#common_deleted_reaction(watched_file, action) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 106

def common_deleted_reaction(watched_file, action)
  # file has gone away or we can't read it anymore.
  watched_file.unwatch
  deletable_filepaths << watched_file.path
  logger.debug("#{action} - stat failed: #{watched_file.path}, removing from collection")
end

#common_error_reaction(path, error, action) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 113

def common_error_reaction(path, error, action)
  logger.error("#{action} - other error #{path}: (#{error.message}, #{error.backtrace.take(8).inspect})")
end

#initialize_handlers(sincedb_collection, observer) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 27

def initialize_handlers(sincedb_collection, observer)
  @read_file = Handlers::ReadFile.new(sincedb_collection, observer, @settings)
  @read_zip_file = Handlers::ReadZipFile.new(sincedb_collection, observer, @settings)
end

#process_active(watched_files) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 81

def process_active(watched_files)
  logger.debug("Active processing")
  # Handles watched_files in the active state.
  watched_files.select {|wf| wf.active? }.each do |watched_file|
    path = watched_file.path
    begin
      watched_file.restat
    rescue Errno::ENOENT
      common_deleted_reaction(watched_file, "Active")
      next
    rescue => e
      common_error_reaction(path, e, "Active")
      next
    end
    break if watch.quit?

    if watched_file.compressed?
      read_zip_file(watched_file)
    else
      read_file(watched_file)
    end
    # handlers take care of closing and unwatching
  end
end

#process_closed(watched_files) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 40

def process_closed(watched_files)
  # do not process watched_files in the closed state.
end

#process_ignored(watched_files) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 44

def process_ignored(watched_files)
  # do not process watched_files in the ignored state.
end

#process_watched(watched_files) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 48

def process_watched(watched_files)
  logger.debug("Watched processing")
  # Handles watched_files in the watched state.
  # for a slice of them:
  #   move to the active state
  #   should never have been active before
  # how much of the max active window is available
  to_take = @settings.max_active - watched_files.count{|wf| wf.active?}
  if to_take > 0
    watched_files.select {|wf| wf.watched?}.take(to_take).each do |watched_file|
      path = watched_file.path
      begin
        watched_file.restat
        watched_file.activate
      rescue Errno::ENOENT
        common_deleted_reaction(watched_file, "Watched")
        next
      rescue => e
        common_error_reaction(path, e, "Watched")
        next
      end
      break if watch.quit?
    end
  else
    now = Time.now.to_i
    if (now - watch.lastwarn_max_files) > MAX_FILES_WARN_INTERVAL
      waiting = watched_files.size - @settings.max_active
      logger.warn(@settings.max_warn_msg + ", files yet to open: #{waiting}")
      watch.lastwarn_max_files = now
    end
  end
end

#read_file(watched_file) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 32

def read_file(watched_file)
  @read_file.handle(watched_file)
end

#read_zip_file(watched_file) ⇒ Object 



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# File 'lib/filewatch/read_mode/processor.rb', line 36

def read_zip_file(watched_file)
  @read_zip_file.handle(watched_file)
end