planetstack/observer/event_loop.py

   1 import time
   2 import traceback
   3 import commands
   4 import threading
   5 import json
   6
   7 from datetime import datetime
   8 from collections import defaultdict
   9 from core.models import *
  10 from django.db.models import F, Q
  11 #from openstack.manager import OpenStackManager
  12 from openstack.driver import OpenStackDriver
  13 from util.logger import Logger, logging, logger
  14 #from timeout import timeout
  15 from planetstack.config import Config
  16 from observer.steps import *
  17
  18 debug_mode = False
  19
  20 logger = Logger(logfile='observer.log', level=logging.INFO)
  21
  22 class StepNotReady(Exception):
  23     pass
  24
  25 def toposort(g, steps):
  26     reverse = {}
  27
  28     for k,v in g.items():
  29         for rk in v:
  30             try:
  31                 reverse[rk].append(k)
  32             except:
  33                 reverse[rk]=k
  34
  35     sources = []
  36     for k,v in g.items():
  37         if not reverse.has_key(k):
  38             sources.append(k)
  39
  40
  41     for k,v in reverse.iteritems():
  42         if (not v):
  43             sources.append(k)
  44
  45     order = []
  46     marked = []
  47
  48     while sources:
  49         n = sources.pop()
  50         try:
  51             for m in g[n]:
  52                 if m not in marked:
  53                     sources.append(m)
  54                     marked.append(m)
  55         except KeyError:
  56             pass
  57         order.append(n)
  58     return order
  59
  60 class PlanetStackObserver:
  61     sync_steps = [SyncNetworks,SyncNetworkSlivers,SyncSites,SyncSitePrivileges,SyncSlices,SyncSliceMemberships,SyncSlivers,SyncSliverIps,SyncExternalRoutes,SyncUsers,GarbageCollector]
  62
  63     def __init__(self):
  64         # The Condition object that gets signalled by Feefie events
  65         self.load_sync_steps()
  66         self.event_cond = threading.Condition()
  67         self.driver = OpenStackDriver()
  68
  69     def wait_for_event(self, timeout):
  70         self.event_cond.acquire()
  71         self.event_cond.wait(timeout)
  72         self.event_cond.release()
  73
  74     def wake_up(self):
  75         logger.info('Wake up routine called. Event cond %r'%self.event_cond)
  76         self.event_cond.acquire()
  77         self.event_cond.notify()
  78         self.event_cond.release()
  79
  80     def load_sync_steps(self):
  81         dep_path = Config().observer_backend_dependency_graph
  82         try:
  83             # This contains dependencies between records, not sync steps
  84             self.model_dependency_graph = json.loads(open(dep_path).read())
  85         except Exception,e:
  86             raise e
  87
  88         try:
  89             backend_path = Config().observer_pl_dependency_graph
  90             # This contains dependencies between backend records
  91             self.backend_dependency_graph = json.loads(open(backend_path).read())
  92         except Exception,e:
  93             # We can work without a backend graph
  94             self.backend_dependency_graph = {}
  95
  96         provides_dict = {}
  97         for s in self.sync_steps:
  98             for m in s.provides:
  99                 try:
 100                     provides_dict[m.__name__].append(s.__name__)
 101                 except KeyError:
 102                     provides_dict[m.__name__]=[s.__name__]
 103
 104
 105         step_graph = {}
 106         for k,v in self.model_dependency_graph.iteritems():
 107             try:
 108                 for source in provides_dict[k]:
 109                     for m in v:
 110                         try:
 111                             for dest in provides_dict[m]:
 112                                 # no deps, pass
 113                                 try:
 114                                     step_graph[source].append(dest)
 115                                 except:
 116                                     step_graph[source]=[dest]
 117                         except KeyError:
 118                             pass
 119
 120             except KeyError:
 121                 pass
 122                 # no dependencies, pass
 123
 124         #import pdb
 125         #pdb.set_trace()
 126         if (self.backend_dependency_graph):
 127             backend_dict = {}
 128             for s in self.sync_steps:
 129                 for m in s.serves:
 130                     backend_dict[m]=s.__name__
 131
 132             for k,v in backend_dependency_graph.iteritems():
 133                 try:
 134                     source = backend_dict[k]
 135                     for m in v:
 136                         try:
 137                             dest = backend_dict[m]
 138                         except KeyError:
 139                             # no deps, pass
 140                             pass
 141                         step_graph[source]=dest
 142
 143                 except KeyError:
 144                     pass
 145                     # no dependencies, pass
 146
 147         dependency_graph = step_graph
 148
 149         self.ordered_steps = toposort(dependency_graph, self.sync_steps)
 150         print "Order of steps=",self.ordered_steps
 151         self.load_run_times()
 152
 153
 154     def check_duration(self):
 155         try:
 156             if (duration > S.deadline):
 157                 logger.info('Sync step %s missed deadline, took %.2f seconds'%(S.name,duration))
 158         except AttributeError:
 159             # S doesn't have a deadline
 160             pass
 161
 162     def update_run_time(self, step):
 163         self.last_run_times[step.name]=time.time()
 164
 165     def check_schedule(self, step):
 166         time_since_last_run = time.time() - self.last_run_times[step.name]
 167         try:
 168             if (time_since_last_run < step.requested_interval):
 169                 raise StepNotReady
 170         except AttributeError:
 171             logger.info('Step %s does not have requested_interval set'%step.name)
 172             raise StepNotReady
 173
 174     def load_run_times(self):
 175         try:
 176             jrun_times = open('/tmp/observer_run_times').read()
 177             self.last_run_times = json.loads(jrun_times)
 178         except:
 179             self.last_run_times={}
 180             for e in self.ordered_steps:
 181                 self.last_run_times[e]=0
 182
 183
 184
 185     def save_run_times(self):
 186         run_times = json.dumps(self.last_run_times)
 187         open('/tmp/observer_run_times','w').write(run_times)
 188
 189     def check_class_dependency(self, step, failed_steps):
 190         for failed_step in failed_steps:
 191             if (failed_step in self.dependency_graph[step.name]):
 192                 raise StepNotReady
 193
 194     def run(self):
 195         if not self.driver.enabled or not self.driver.has_openstack:
 196             return
 197
 198         while True:
 199             try:
 200                 logger.info('Waiting for event')
 201                 tBeforeWait = time.time()
 202                 self.wait_for_event(timeout=300)
 203                 logger.info('Observer woke up')
 204
 205                 # Set of whole steps that failed
 206                 failed_steps = []
 207
 208                 # Set of individual objects within steps that failed
 209                 failed_step_objects = []
 210
 211                 for S in self.ordered_steps:
 212                     start_time=time.time()
 213
 214                     sync_step = S(driver=self.driver)
 215                     sync_step.dependencies = self.dependencies[sync_step.name]
 216                     sync_step.debug_mode = debug_mode
 217
 218                     should_run = False
 219                     try:
 220                         # Various checks that decide whether
 221                         # this step runs or not
 222                         self.check_class_dependency(sync_step, failed_steps) # dont run Slices if Sites failed
 223                         self.check_schedule(sync_step) # dont run sync_network_routes if time since last run < 1 hour
 224                         should_run = True
 225                     except StepNotReady:
 226                         logging.info('Step not ready: %s'%sync_step.name)
 227                         failed_steps.add(sync_step)
 228                     except:
 229                         failed_steps.add(sync_step)
 230
 231                     if (should_run):
 232                         try:
 233                             duration=time.time() - start_time
 234
 235                             # ********* This is the actual sync step
 236                             failed_objects = sync_step(failed=failed_step_objects)
 237
 238
 239                             check_deadline(sync_step, duration)
 240                             failed_step_objects.extend(failed_objects)
 241                             self.update_run_time(sync_step)
 242                         except:
 243                             failed_steps.add(S)
 244                 self.save_run_times()
 245             except:
 246                 logger.log_exc("Exception in observer run loop")
 247                 traceback.print_exc()