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""" File monitor backend with `Gamin
<http://people.gnome.org/~veillard/gamin/>`_ support. """
import os
import stat
from gamin import WatchMonitor, GAMCreated, GAMExists, GAMEndExist, \
GAMChanged, GAMDeleted
from Bcfg2.Server.FileMonitor import Event, FileMonitor
class GaminEvent(Event):
""" This class maps Gamin event constants to FAM :ref:`event codes
<development-fam-event-codes>`. """
#: The map of gamin event constants (which mirror FAM event names
#: closely) to :ref:`event codes <development-fam-event-codes>`
action_map = {GAMCreated: 'created', GAMExists: 'exists',
GAMChanged: 'changed', GAMDeleted: 'deleted',
GAMEndExist: 'endExist'}
def __init__(self, request_id, filename, code):
Event.__init__(self, request_id, filename, code)
if code in self.action_map:
self.action = self.action_map[code]
__init__.__doc__ = Event.__init__.__doc__
class Gamin(FileMonitor):
""" File monitor backend with `Gamin
<http://people.gnome.org/~veillard/gamin/>`_ support. """
#: The Gamin backend is fairly decent, particularly newer
#: releases, so it has a fairly high priority.
__priority__ = 90
def __init__(self):
FileMonitor.__init__(self)
#: The :class:`Gamin.WatchMonitor` object for this monitor.
self.mon = None
#: The counter used to produce monotonically increasing
#: monitor handle IDs
self.counter = 0
#: The queue used to record monitors that are added before
#: :func:`start` has been called and :attr:`mon` is created.
self.add_q = []
__init__.__doc__ = FileMonitor.__init__.__doc__
def start(self):
""" The Gamin watch monitor in :attr:`mon` must be created by
the daemonized process, so is created in ``start()``. Before
the :class:`Gamin.WatchMonitor` object is created, monitors
are added to :attr:`add_q`, and are created once the watch
monitor is created."""
FileMonitor.start(self)
self.mon = WatchMonitor()
for monitor in self.add_q:
self.AddMonitor(*monitor)
self.add_q = []
def fileno(self):
if self.started:
return self.mon.get_fd()
else:
return None
fileno.__doc__ = FileMonitor.fileno.__doc__
def queue(self, path, action, request_id):
""" Create a new :class:`GaminEvent` and add it to the
:attr:`events` queue for later handling. """
self.events.append(GaminEvent(request_id, path, action))
def AddMonitor(self, path, obj, handle=None):
if handle is None:
handle = self.counter
self.counter += 1
if not self.started:
self.add_q.append((path, obj, handle))
return handle
mode = os.stat(path)[stat.ST_MODE]
# Flush queued gamin events
while self.mon.event_pending():
self.mon.handle_one_event()
if stat.S_ISDIR(mode):
self.mon.watch_directory(path, self.queue, handle)
else:
self.mon.watch_file(path, self.queue, handle)
self.handles[handle] = obj
return handle
AddMonitor.__doc__ = FileMonitor.AddMonitor.__doc__
def pending(self):
return FileMonitor.pending(self) or self.mon.event_pending()
pending.__doc__ = FileMonitor.pending.__doc__
def get_event(self):
if self.mon.event_pending():
self.mon.handle_one_event()
return FileMonitor.get_event(self)
get_event.__doc__ = FileMonitor.get_event.__doc__
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