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""" Fam provides FAM support for file alteration events """
import os
import _fam
import stat
import logging
from time import time
from Bcfg2.Server.FileMonitor import FileMonitor
logger = logging.getLogger(__name__)
class Fam(FileMonitor):
__priority__ = 90
def __init__(self, ignore=None, debug=False):
FileMonitor.__init__(self, ignore=ignore, debug=debug)
self.fm = _fam.open()
self.users = {}
def fileno(self):
"""Return fam file handle number."""
return self.fm.fileno()
def handle_event_set(self, _):
self.Service()
def handle_events_in_interval(self, interval):
now = time()
while (time() - now) < interval:
if self.Service():
now = time()
def AddMonitor(self, path, obj):
"""Add a monitor to path, installing a callback to obj.HandleEvent."""
mode = os.stat(path)[stat.ST_MODE]
if stat.S_ISDIR(mode):
handle = self.fm.monitorDirectory(path, None)
else:
handle = self.fm.monitorFile(path, None)
self.handles[handle.requestID()] = handle
if obj != None:
self.users[handle.requestID()] = obj
return handle.requestID()
def Service(self, interval=0.50):
"""Handle all fam work."""
count = 0
collapsed = 0
rawevents = []
start = time()
now = time()
while (time() - now) < interval:
if self.fm.pending():
while self.fm.pending():
count += 1
rawevents.append(self.fm.nextEvent())
now = time()
unique = []
bookkeeping = []
for event in rawevents:
if self.should_ignore(event):
continue
if event.code2str() != 'changed':
# process all non-change events
unique.append(event)
else:
if (event.filename, event.requestID) not in bookkeeping:
bookkeeping.append((event.filename, event.requestID))
unique.append(event)
else:
collapsed += 1
for event in unique:
if event.requestID in self.users:
try:
self.users[event.requestID].HandleEvent(event)
except:
logger.error("Handling event for file %s" % event.filename,
exc_info=1)
end = time()
logger.info("Processed %s fam events in %03.03f seconds. %s coalesced" %
(count, (end - start), collapsed))
return count
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