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from time import time
import logging, os, stat
logger = logging.getLogger('Bcfg2.Server.FileMonitor')
def ShouldIgnore(event):
'''Test if the event should be suppresed'''
# FIXME should move event suppression out of the core
if event.filename.split('/')[-1] == '.svn':
return True
if event.filename.endswith('~') or event.filename.endswith('.tmp') \
or event.filename.startswith('#') or event.filename.startswith('.#'):
#logger.error("Suppressing event for file %s" % (event.filename))
return True
return False
class FamFam(object):
'''The fam object is a set of callbacks for file alteration events (FAM support)'''
def __init__(self):
object.__init__(self)
self.fm = _fam.open()
self.users = {}
self.handles = {}
self.debug = False
def fileno(self):
'''return fam file handle number'''
return self.fm.fileno()
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):
'''Handle all fam work'''
count = 0
collapsed = 0
rawevents = []
start = time()
now = time()
while (time() - now) < 0.10:
if self.fm.pending():
while self.fm.pending():
count += 1
rawevents.append(self.fm.nextEvent())
now = time()
unique = []
bookkeeping = []
for event in rawevents:
if ShouldIgnore(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
class Event(object):
def __init__(self, request_id, filename, code):
self.requestID = request_id
self.filename = filename
self.action = code
def code2str(self):
'''return static code for event'''
return self.action
class GaminEvent(Event):
'''This class provides an event analogous to python-fam events based on gamin sources'''
def __init__(self, request_id, filename, code):
Event.__init__(self, request_id, filename, code)
action_map = {GAMCreated: 'created', GAMExists: 'exists', GAMChanged: 'changed',
GAMDeleted: 'deleted', GAMEndExist: 'endExist', GAMMoved: 'moved'}
if code in action_map:
self.action = action_map[code]
class GaminFam(object):
'''The fam object is a set of callbacks for file alteration events (Gamin support)'''
def __init__(self):
object.__init__(self)
self.mon = WatchMonitor()
self.handles = {}
self.counter = 0
self.events = []
self.debug = False
def fileno(self):
'''return fam file handle number'''
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):
'''add a monitor to path, installing a callback to obj.HandleEvent'''
handle = self.counter
self.counter += 1
mode = os.stat(path)[stat.ST_MODE]
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 Service(self):
'''Handle all gamin work'''
count = 0
collapsed = 0
start = time()
if self.mon.event_pending():
while self.mon.event_pending():
count += 1
self.mon.handle_one_event()
else:
return 0
unique = []
bookkeeping = []
for event in self.events:
if ShouldIgnore(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
self.events = []
for event in unique:
if event.requestID not in self.handles:
logger.info("Got event for unexpected id %s, file %s" %
(event.requestID, event.filename))
continue
if self.debug:
logger.info("Dispatching event %s %s to obj %s" \
% (event.code2str(), event.filename,
self.handles[event.requestID]))
try:
self.handles[event.requestID].HandleEvent(event)
except:
logger.error("error in handling of gamin event for %s" % \
(event.filename), exc_info=1)
end = time()
logger.info("Processed %s gamin events in %03.03f seconds. %s collapsed" %
(count, (end - start), collapsed))
return count
class PseudoFam(object):
'''The fam object is a set of callbacks for file alteration events (FAM support)'''
def __init__(self):
object.__init__(self)
self.users = {}
self.handles = {}
self.debug = False
self.pending = []
def AddMonitor(self, path, obj):
'''add a monitor to path, installing a callback to obj.HandleEvent'''
handleID = len(self.handles.keys())
mode = os.stat(path)[stat.ST_MODE]
handle = GaminEvent(handleID, path, 'exists')
if stat.S_ISDIR(mode):
dirList = os.listdir(path)
self.pending.append(handle)
for includedFile in dirList:
self.pending.append(GaminEvent(handleID, includedFile, 'exists'))
self.pending.append(GaminEvent(handleID, path, 'endExist'))
else:
self.pending.append(GaminEvent(handleID, path, 'exists'))
self.handles[handleID] = handle
if obj != None:
self.users[handleID] = obj
return handleID
def Service(self):
'''Handle all fam work'''
count = 0
rawevents = []
for event in self.pending:
count += 1
rawevents.append(event)
self.pending = []
for event in rawevents:
if event.requestID in self.users:
self.users[event.requestID].HandleEvent(event)
return count
available = {}
try:
from gamin import WatchMonitor, GAMCreated, GAMExists, GAMEndExist, GAMChanged, GAMDeleted, GAMMoved
available['gamin'] = GaminFam
except ImportError:
# fall back to _fam
pass
try:
import _fam
available['fam'] = FamFam
except ImportError:
pass
available['pseudo'] = PseudoFam
for fdrv in ['gamin', 'fam', 'pseudo']:
if fdrv in available:
available['default'] = available[fdrv]
break
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