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""" Gamin driver for file alteration events """
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 provides an event analogous to
python-fam events based on gamin sources.
"""
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]
class Gamin(FileMonitor):
""" file monitor with gamin support """
__priority__ = 10
def __init__(self, ignore=None, debug=False):
FileMonitor.__init__(self, ignore=ignore, debug=debug)
self.mon = None
self.counter = 0
self.add_q = []
def start(self):
FileMonitor.start(self)
self.mon = WatchMonitor()
for monitor in self.add_q:
self.AddMonitor(*monitor)
self.add_q = []
def fileno(self):
return self.mon.get_fd()
def queue(self, path, action, request_id):
"""queue up the event for later handling"""
self.events.append(GaminEvent(request_id, path, action))
def AddMonitor(self, path, obj, handle=None):
"""Add a monitor to path, installing a callback to obj."""
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
def pending(self):
return FileMonitor.pending(self) or self.mon.event_pending()
def get_event(self):
if self.mon.event_pending():
self.mon.handle_one_event()
return FileMonitor.get_event(self)
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