blob: 6c19215592e7628d356f1012fb82f41fd18cbea2 [file] [log] [blame]
import os
import imp
import inspect
import time
import traceback
import commands
import threading
import json
from datetime import datetime
from collections import defaultdict
from core.models import *
from django.db.models import F, Q
#from openstack.manager import OpenStackManager
from openstack.driver import OpenStackDriver
from util.logger import Logger, logging, logger
#from timeout import timeout
from planetstack.config import Config
#from observer.steps import *
from syncstep import SyncStep
from toposort import toposort
debug_mode = False
logger = Logger(level=logging.INFO)
class StepNotReady(Exception):
pass
class NoOpDriver:
def __init__(self):
self.enabled = True
class PlanetStackObserver:
#sync_steps = [SyncNetworks,SyncNetworkSlivers,SyncSites,SyncSitePrivileges,SyncSlices,SyncSliceMemberships,SyncSlivers,SyncSliverIps,SyncExternalRoutes,SyncUsers,SyncRoles,SyncNodes,SyncImages,GarbageCollector]
sync_steps = []
def __init__(self):
# The Condition object that gets signalled by Feefie events
self.step_lookup = {}
self.load_sync_step_modules()
self.load_sync_steps()
self.event_cond = threading.Condition()
self.driver_kind = getattr(Config(), "observer_driver", "openstack")
if self.driver_kind=="openstack":
self.driver = OpenStackDriver()
else:
self.driver = NoOpDriver()
def wait_for_event(self, timeout):
logger.info('Waiting for event')
self.event_cond.acquire()
self.event_cond.wait(timeout)
self.event_cond.release()
def wake_up(self):
logger.info('Wake up routine called. Event cond %r'%self.event_cond)
self.event_cond.acquire()
self.event_cond.notify()
self.event_cond.release()
def load_sync_step_modules(self, step_dir=None):
if step_dir is None:
if hasattr(Config(), "observer_steps_dir"):
step_dir = Config().observer_steps_dir
else:
step_dir = "/opt/planetstack/observer/steps"
for fn in os.listdir(step_dir):
pathname = os.path.join(step_dir,fn)
if os.path.isfile(pathname) and fn.endswith(".py") and (fn!="__init__.py"):
module = imp.load_source(fn[:-3],pathname)
for classname in dir(module):
c = getattr(module, classname, None)
# make sure 'c' is a descendent of SyncStep and has a
# provides field (this eliminates the abstract base classes
# since they don't have a provides)
if inspect.isclass(c) and issubclass(c, SyncStep) and hasattr(c,"provides") and (c not in self.sync_steps):
self.sync_steps.append(c)
logger.info('loaded sync steps: %s' % ",".join([x.__name__ for x in self.sync_steps]))
# print 'loaded sync steps: %s' % ",".join([x.__name__ for x in self.sync_steps])
def load_sync_steps(self):
dep_path = Config().observer_dependency_graph
logger.info('Loading model dependency graph from %s' % dep_path)
try:
# This contains dependencies between records, not sync steps
self.model_dependency_graph = json.loads(open(dep_path).read())
except Exception,e:
raise e
try:
backend_path = Config().observer_pl_dependency_graph
logger.info('Loading backend dependency graph from %s' % backend_path)
# This contains dependencies between backend records
self.backend_dependency_graph = json.loads(open(backend_path).read())
except Exception,e:
logger.info('Backend dependency graph not loaded')
# We can work without a backend graph
self.backend_dependency_graph = {}
provides_dict = {}
for s in self.sync_steps:
self.step_lookup[s.__name__] = s
for m in s.provides:
try:
provides_dict[m.__name__].append(s.__name__)
except KeyError:
provides_dict[m.__name__]=[s.__name__]
step_graph = {}
for k,v in self.model_dependency_graph.iteritems():
try:
for source in provides_dict[k]:
for m in v:
try:
for dest in provides_dict[m]:
# no deps, pass
try:
if (dest not in step_graph[source]):
step_graph[source].append(dest)
except:
step_graph[source]=[dest]
except KeyError:
pass
except KeyError:
pass
# no dependencies, pass
#import pdb
#pdb.set_trace()
if (self.backend_dependency_graph):
backend_dict = {}
for s in self.sync_steps:
for m in s.serves:
backend_dict[m]=s.__name__
for k,v in backend_dependency_graph.iteritems():
try:
source = backend_dict[k]
for m in v:
try:
dest = backend_dict[m]
except KeyError:
# no deps, pass
pass
step_graph[source]=dest
except KeyError:
pass
# no dependencies, pass
dependency_graph = step_graph
self.ordered_steps = toposort(dependency_graph, map(lambda s:s.__name__,self.sync_steps))
print "Order of steps=",self.ordered_steps
self.load_run_times()
def check_duration(self, step, duration):
try:
if (duration > step.deadline):
logger.info('Sync step %s missed deadline, took %.2f seconds'%(step.name,duration))
except AttributeError:
# S doesn't have a deadline
pass
def update_run_time(self, step):
self.last_run_times[step.__name__]=time.time()
def check_schedule(self, step):
time_since_last_run = time.time() - self.last_run_times.get(step.__name__, 0)
try:
if (time_since_last_run < step.requested_interval):
raise StepNotReady
except AttributeError:
logger.info('Step %s does not have requested_interval set'%step.__name__)
raise StepNotReady
def load_run_times(self):
try:
jrun_times = open('/tmp/observer_run_times').read()
self.last_run_times = json.loads(jrun_times)
except:
self.last_run_times={}
for e in self.ordered_steps:
self.last_run_times[e]=0
def save_run_times(self):
run_times = json.dumps(self.last_run_times)
open('/tmp/observer_run_times','w').write(run_times)
def check_class_dependency(self, step, failed_steps):
step.dependenices = []
for obj in step.provides:
step.dependenices.extend(self.model_dependency_graph.get(obj.__name__, []))
for failed_step in failed_steps:
if (failed_step in step.dependencies):
raise StepNotReady
def run_steps(self):
try:
logger.info('Observer run steps')
# Set of whole steps that failed
failed_steps = []
# Set of individual objects within steps that failed
failed_step_objects = set()
for S in self.ordered_steps:
step = self.step_lookup[S]
start_time=time.time()
sync_step = step(driver=self.driver)
sync_step.__name__ = step.__name__
sync_step.dependencies = []
try:
mlist = sync_step.provides
for m in mlist:
sync_step.dependencies.extend(self.model_dependency_graph[m.__name__])
except KeyError:
pass
sync_step.debug_mode = debug_mode
should_run = False
try:
# Various checks that decide whether
# this step runs or not
self.check_class_dependency(sync_step, failed_steps) # dont run Slices if Sites failed
self.check_schedule(sync_step) # dont run sync_network_routes if time since last run < 1 hour
should_run = True
except StepNotReady:
logger.info('Step not ready: %s'%sync_step.__name__)
failed_steps.append(sync_step)
except:
logger.info('Exception when checking schedule: %s'%sync_step.__name__)
failed_steps.append(sync_step)
if (should_run):
try:
duration=time.time() - start_time
logger.info('Executing step %s' % sync_step.__name__)
# ********* This is the actual sync step
#import pdb
#pdb.set_trace()
failed_objects = sync_step(failed=list(failed_step_objects))
self.check_duration(sync_step, duration)
if failed_objects:
failed_step_objects.update(failed_objects)
self.update_run_time(sync_step)
except:
logger.log_exc('Failure in step: %s'%sync_step.__name__)
failed_steps.append(S)
self.save_run_times()
except:
logger.log_exc("Exception in observer run loop")
traceback.print_exc()
def run(self):
try:
logger.info('Observer start run loop')
if not self.driver.enabled:
return
if (self.driver_kind=="openstack") and (not self.driver.has_openstack):
return
while True:
try:
self.wait_for_event(timeout=30)
except:
logger.log_exc("Exception in observer wait for event")
traceback.print_exc()
try:
self.run_steps()
except:
logger.log_exc("Exception in observer run steps")
traceback.print_exc()
except:
logger.log_exc("Exception in observer run loop")
traceback.print_exc()