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import sys
import atexit
import daemon
import logging
import time
import traceback
import threading
# pylint: disable=E0611
from lockfile import LockFailed, LockTimeout, AlreadyLocked
try:
from lockfile.pidlockfile import PIDLockFile
from lockfile import Error as PIDFileError
except ImportError:
from daemon.pidlockfile import PIDLockFile, PIDFileError
# pylint: enable=E0611
import Bcfg2.Logger
from Bcfg2.Reporting.Transport import load_transport_from_config, \
TransportError, TransportImportError
from Bcfg2.Reporting.Transport.DirectStore import DirectStore
from Bcfg2.Reporting.Storage import load_storage_from_config, \
StorageError, StorageImportError
class ReportingError(Exception):
"""Generic reporting exception"""
pass
class ReportingStoreThread(threading.Thread):
"""Thread for calling the storage backend"""
def __init__(self, interaction, storage, group=None, target=None,
name=None, args=(), kwargs=None):
"""Initialize the thread with a reference to the interaction
as well as the storage engine to use"""
threading.Thread.__init__(self, group, target, name, args,
kwargs or dict())
self.interaction = interaction
self.storage = storage
self.logger = logging.getLogger('bcfg2-report-collector')
def run(self):
"""Call the database storage procedure (aka import)"""
try:
start = time.time()
self.storage.import_interaction(self.interaction)
self.logger.info("Imported interaction for %s in %ss" %
(self.interaction.get('hostname', '<unknown>'),
time.time() - start))
except:
#TODO requeue?
self.logger.error("Unhandled exception in import thread %s" %
traceback.format_exc().splitlines()[-1])
class ReportingCollector(object):
"""The collecting process for reports"""
def __init__(self, setup):
"""Setup the collector. This may be called by the daemon or though
bcfg2-admin"""
self.setup = setup
self.datastore = setup['repo']
self.encoding = setup['encoding']
self.terminate = None
self.context = None
self.children = []
self.cleanup_threshold = 25
if setup['debug']:
level = logging.DEBUG
elif setup['verbose']:
level = logging.INFO
else:
level = logging.WARNING
Bcfg2.Logger.setup_logging('bcfg2-report-collector',
to_console=logging.INFO,
to_syslog=setup['syslog'],
to_file=setup['logging'],
level=level)
self.logger = logging.getLogger('bcfg2-report-collector')
try:
self.transport = load_transport_from_config(setup)
self.storage = load_storage_from_config(setup)
except TransportError:
self.logger.error("Failed to load transport: %s" %
traceback.format_exc().splitlines()[-1])
raise ReportingError
except StorageError:
self.logger.error("Failed to load storage: %s" %
traceback.format_exc().splitlines()[-1])
raise ReportingError
if isinstance(self.transport, DirectStore):
self.logger.error("DirectStore cannot be used with the collector. "
"Use LocalFilesystem instead")
self.shutdown()
raise ReportingError
try:
self.logger.debug("Validating storage %s" %
self.storage.__class__.__name__)
self.storage.validate()
except:
self.logger.error("Storage backed %s failed to validate: %s" %
(self.storage.__class__.__name__,
traceback.format_exc().splitlines()[-1]))
def run(self):
"""Startup the processing and go!"""
self.terminate = threading.Event()
atexit.register(self.shutdown)
self.context = daemon.DaemonContext(detach_process=True)
iter = 0
if self.setup['daemon']:
self.logger.debug("Daemonizing")
self.context.pidfile = PIDLockFile(self.setup['daemon'])
try:
self.context.pidfile.acquire()
except LockFailed:
self.logger.error("Failed to daemonize: %s" %
sys.exc_info()[1])
self.shutdown()
return
except AlreadyLocked:
try: # attempt to break the lock
os.kill(self.context.pidfile.read_pid(), 0)
except OSError: # No process with locked PID
self.context.pidfile.break_lock()
else:
self.logger.error("Failed to daemonize: "
"Failed to acquire lock on %s" %
self.setup['daemon'])
self.shutdown()
return
except LockTimeout:
try: # attempt to break the lock
os.kill(self.context.pidfile.read_pid(), 0)
except OSError: # No process with locked PID
self.context.pidfile.break_lock()
else:
self.logger.error("Failed to daemonize: "
"Failed to acquire lock on %s" %
self.setup['daemon'])
self.shutdown()
return
except PIDFileError:
self.logger.error("Error writing pid file: %s" %
traceback.format_exc().splitlines()[-1])
self.shutdown()
return
self.context.open()
self.logger.info("Starting daemon")
self.transport.start_monitor(self)
while not self.terminate.isSet():
try:
interaction = self.transport.fetch()
if not interaction:
continue
store_thread = ReportingStoreThread(interaction, self.storage)
store_thread.start()
self.children.append(store_thread)
iter += 1
if iter >= self.cleanup_threshold:
self.reap_children()
iter = 0
except (SystemExit, KeyboardInterrupt):
self.logger.info("Shutting down")
self.shutdown()
except:
self.logger.error("Unhandled exception in main loop %s" %
traceback.format_exc().splitlines()[-1])
def shutdown(self):
"""Cleanup and go"""
if self.terminate:
# this wil be missing if called from bcfg2-admin
self.terminate.set()
if self.transport:
try:
self.transport.shutdown()
except OSError:
pass
if self.storage:
self.storage.shutdown()
def reap_children(self):
"""Join any non-live threads"""
newlist = []
self.logger.debug("Starting reap_children")
for child in self.children:
if child.isAlive():
newlist.append(child)
else:
child.join()
self.logger.debug("Joined child thread %s" % child.getName())
self.children = newlist
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