planetstack/ec2_observer/event_loop.py

   1 import os
   2 import imp
   3 import inspect
   4 import time
   5 import traceback
   6 import commands
   7 import threading
   8 import json
   9
  10 from datetime import datetime
  11 from collections import defaultdict
  12 from core.models import *
  13 from django.db.models import F, Q
  14 #from openstack.manager import OpenStackManager
  15 from openstack.driver import OpenStackDriver
  16 from util.logger import Logger, logging, logger
  17 #from timeout import timeout
  18 from planetstack.config import Config
  19 from ec2_observer.steps import *
  20 from syncstep import SyncStep
  21 from toposort import toposort
  22 from ec2_observer.error_mapper import *
  23
  24 debug_mode = False
  25
  26 logger = Logger(level=logging.INFO)
  27
  28 class StepNotReady(Exception):
  29     pass
  30
  31 class NoOpDriver:
  32     def __init__(self):
  33          self.enabled = True
  34
  35 class PlanetStackObserver:
  36         #sync_steps = [SyncNetworks,SyncNetworkSlivers,SyncSites,SyncSitePrivileges,SyncSlices,SyncSliceMemberships,SyncSlivers,SyncSliverIps,SyncExternalRoutes,SyncUsers,SyncRoles,SyncNodes,SyncImages,GarbageCollector]
  37         sync_steps = []
  38
  39         def __init__(self):
  40                 # The Condition object that gets signalled by Feefie events
  41                 self.step_lookup = {}
  42                 self.load_sync_step_modules()
  43                 self.load_sync_steps()
  44                 self.event_cond = threading.Condition()
  45
  46                 self.driver_kind = getattr(Config(), "observer_driver", "openstack")
  47                 if self.driver_kind=="openstack":
  48                         self.driver = OpenStackDriver()
  49                 else:
  50                         self.driver = NoOpDriver()
  51
  52         def wait_for_event(self, timeout):
  53                 self.event_cond.acquire()
  54                 self.event_cond.wait(timeout)
  55                 self.event_cond.release()
  56
  57         def wake_up(self):
  58                 logger.info('Wake up routine called. Event cond %r'%self.event_cond)
  59                 self.event_cond.acquire()
  60                 self.event_cond.notify()
  61                 self.event_cond.release()
  62
  63         def load_sync_step_modules(self, step_dir=None):
  64                 if step_dir is None:
  65                         if hasattr(Config(), "observer_steps_dir"):
  66                                 step_dir = Config().observer_steps_dir
  67                         else:
  68                                 step_dir = "/opt/planetstack/observer/steps"
  69
  70                 for fn in os.listdir(step_dir):
  71                         pathname = os.path.join(step_dir,fn)
  72                         if os.path.isfile(pathname) and fn.endswith(".py") and (fn!="__init__.py"):
  73                                 module = imp.load_source(fn[:-3],pathname)
  74                                 for classname in dir(module):
  75                                         c = getattr(module, classname, None)
  76
  77                                         # make sure 'c' is a descendent of SyncStep and has a
  78                                         # provides field (this eliminates the abstract base classes
  79                                         # since they don't have a provides)
  80
  81                                         if inspect.isclass(c) and issubclass(c, SyncStep) and hasattr(c,"provides") and (c not in self.sync_steps):
  82                                                 self.sync_steps.append(c)
  83                 logger.info('loaded sync steps: %s' % ",".join([x.__name__ for x in self.sync_steps]))
  84                 # print 'loaded sync steps: %s' % ",".join([x.__name__ for x in self.sync_steps])
  85
  86         def load_sync_steps(self):
  87                 dep_path = Config().observer_dependency_graph
  88                 logger.info('Loading model dependency graph from %s' % dep_path)
  89                 try:
  90                         # This contains dependencies between records, not sync steps
  91                         self.model_dependency_graph = json.loads(open(dep_path).read())
  92                 except Exception,e:
  93                         raise e
  94
  95                 try:
  96                         backend_path = Config().observer_pl_dependency_graph
  97                         logger.info('Loading backend dependency graph from %s' % backend_path)
  98                         # This contains dependencies between backend records
  99                         self.backend_dependency_graph = json.loads(open(backend_path).read())
 100                 except Exception,e:
 101                         logger.info('Backend dependency graph not loaded')
 102                         # We can work without a backend graph
 103                         self.backend_dependency_graph = {}
 104
 105                 provides_dict = {}
 106                 for s in self.sync_steps:
 107                         self.step_lookup[s.__name__] = s
 108                         for m in s.provides:
 109                                 try:
 110                                         provides_dict[m.__name__].append(s.__name__)
 111                                 except KeyError:
 112                                         provides_dict[m.__name__]=[s.__name__]
 113
 114
 115                 step_graph = {}
 116                 for k,v in self.model_dependency_graph.iteritems():
 117                         try:
 118                                 for source in provides_dict[k]:
 119                                         for m in v:
 120                                                 try:
 121                                                         for dest in provides_dict[m]:
 122                                                                 # no deps, pass
 123                                                                 try:
 124                                                                         if (dest not in step_graph[source]):
 125                                                                                 step_graph[source].append(dest)
 126                                                                 except:
 127                                                                         step_graph[source]=[dest]
 128                                                 except KeyError:
 129                                                         pass
 130
 131                         except KeyError:
 132                                 pass
 133                                 # no dependencies, pass
 134
 135                 #import pdb
 136                 #pdb.set_trace()
 137                 if (self.backend_dependency_graph):
 138                         backend_dict = {}
 139                         for s in self.sync_steps:
 140                                 for m in s.serves:
 141                                         backend_dict[m]=s.__name__
 142
 143                         for k,v in backend_dependency_graph.iteritems():
 144                                 try:
 145                                         source = backend_dict[k]
 146                                         for m in v:
 147                                                 try:
 148                                                         dest = backend_dict[m]
 149                                                 except KeyError:
 150                                                         # no deps, pass
 151                                                         pass
 152                                                 step_graph[source]=dest
 153
 154                                 except KeyError:
 155                                         pass
 156                                         # no dependencies, pass
 157
 158                 dependency_graph = step_graph
 159
 160                 self.ordered_steps = toposort(dependency_graph, map(lambda s:s.__name__,self.sync_steps))
 161                 print "Order of steps=",self.ordered_steps
 162                 self.load_run_times()
 163
 164
 165         def check_duration(self, step, duration):
 166                 try:
 167                         if (duration > step.deadline):
 168                                 logger.info('Sync step %s missed deadline, took %.2f seconds'%(step.name,duration))
 169                 except AttributeError:
 170                         # S doesn't have a deadline
 171                         pass
 172
 173         def update_run_time(self, step, deletion):
 174                 if (not deletion):
 175                         self.last_run_times[step.__name__]=time.time()
 176                 else:
 177                         self.last_deletion_run_times[step.__name__]=time.time()
 178
 179
 180         def check_schedule(self, step, deletion):
 181                 last_run_times = self.last_run_times if not deletion else self.last_deletion_run_times
 182
 183                 time_since_last_run = time.time() - last_run_times.get(step.__name__, 0)
 184                 try:
 185                         if (time_since_last_run < step.requested_interval):
 186                                 raise StepNotReady
 187                 except AttributeError:
 188                         logger.info('Step %s does not have requested_interval set'%step.__name__)
 189                         raise StepNotReady
 190
 191         def load_run_times(self):
 192                 try:
 193                         jrun_times = open('/tmp/observer_run_times').read()
 194                         self.last_run_times = json.loads(jrun_times)
 195                 except:
 196                         self.last_run_times={}
 197                         for e in self.ordered_steps:
 198                                 self.last_run_times[e]=0
 199                 try:
 200                         jrun_times = open('/tmp/observer_deletion_run_times').read()
 201                         self.last_deletion_run_times = json.loads(jrun_times)
 202                 except:
 203                         self.last_deletion_run_times={}
 204                         for e in self.ordered_steps:
 205                                 self.last_deletion_run_times[e]=0
 206
 207
 208
 209         def save_run_times(self):
 210                 run_times = json.dumps(self.last_run_times)
 211                 open('/tmp/observer_run_times','w').write(run_times)
 212
 213                 deletion_run_times = json.dumps(self.last_deletion_run_times)
 214                 open('/tmp/observer_deletion_run_times','w').write(deletion_run_times)
 215
 216         def check_class_dependency(self, step, failed_steps):
 217                 step.dependenices = []
 218                 for obj in step.provides:
 219                         step.dependenices.extend(self.model_dependency_graph.get(obj.__name__, []))
 220                 for failed_step in failed_steps:
 221                         if (failed_step in step.dependencies):
 222                                 raise StepNotReady
 223
 224         def run(self):
 225                 if not self.driver.enabled:
 226                         return
 227                 if (self.driver_kind=="openstack") and (not self.driver.has_openstack):
 228                         return
 229
 230                 while True:
 231                         try:
 232                                 error_map_file = getattr(Config(), "error_map_path", "/opt/planetstack/error_map.txt")
 233                                 error_mapper = ErrorMapper(error_map_file)
 234
 235                                 logger.info('Waiting for event')
 236                                 tBeforeWait = time.time()
 237                                 self.wait_for_event(timeout=30)
 238                                 logger.info('Observer woke up')
 239
 240                                 # Two passes. One for sync, the other for deletion.
 241                                 for deletion in (False,True):
 242                                         logger.info('Deletion=%r...'%deletion)
 243                                         # Set of whole steps that failed
 244                                         failed_steps = []
 245
 246                                         # Set of individual objects within steps that failed
 247                                         failed_step_objects = set()
 248
 249                                         ordered_steps = self.ordered_steps if not deletion else reversed(self.ordered_steps)
 250
 251                                         for S in ordered_steps:
 252                                                 step = self.step_lookup[S]
 253                                                 start_time=time.time()
 254
 255                                                 sync_step = step(driver=self.driver,error_map=error_mapper)
 256                                                 sync_step.__name__ = step.__name__
 257                                                 sync_step.dependencies = []
 258                                                 try:
 259                                                         mlist = sync_step.provides
 260
 261                                                         for m in mlist:
 262                                                                 sync_step.dependencies.extend(self.model_dependency_graph[m.__name__])
 263                                                 except KeyError:
 264                                                         pass
 265                                                 sync_step.debug_mode = debug_mode
 266
 267                                                 should_run = False
 268                                                 try:
 269                                                         # Various checks that decide whether
 270                                                         # this step runs or not
 271                                                         self.check_class_dependency(sync_step, failed_steps) # dont run Slices if Sites failed
 272                                                         self.check_schedule(sync_step, deletion) # dont run sync_network_routes if time since last run < 1 hour
 273                                                         should_run = True
 274                                                 except StepNotReady:
 275                                                         logging.info('Step not ready: %s'%sync_step.__name__)
 276                                                         failed_steps.append(sync_step)
 277                                                 except Exception,e:
 278                                                         logging.error('%r',e)
 279                                                         logger.log_exc("sync step failed: %r. Deletion: %r"%(sync_step,deletion))
 280                                                         failed_steps.append(sync_step)
 281
 282                                                 if (should_run):
 283                                                         try:
 284                                                                 duration=time.time() - start_time
 285
 286                                                                 logger.info('Executing step %s' % sync_step.__name__)
 287
 288                                                                 # ********* This is the actual sync step
 289                                                                 #import pdb
 290                                                                 #pdb.set_trace()
 291                                                                 failed_objects = sync_step(failed=list(failed_step_objects), deletion=deletion)
 292
 293
 294                                                                 self.check_duration(sync_step, duration)
 295                                                                 if failed_objects:
 296                                                                         failed_step_objects.update(failed_objects)
 297
 298                                                                 self.update_run_time(sync_step,deletion)
 299                                                         except Exception,e:
 300                                                                 logging.error('Model step failed. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!',e)
 301                                                                 logger.log_exc(e)
 302                                                                 failed_steps.append(S)
 303                                 self.save_run_times()
 304                         except Exception, e:
 305                                 logging.error('Core error. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!',e)
 306                                 logger.log_exc("Exception in observer run loop")
 307                                 traceback.print_exc()