| 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 * |
| |
| debug_mode = False |
| |
| logger = Logger(logfile='observer.log', level=logging.INFO) |
| |
| class StepNotReady(Exception): |
| pass |
| |
| def toposort(g, steps): |
| reverse = {} |
| |
| for k,v in g.items(): |
| for rk in v: |
| try: |
| reverse[rk].append(k) |
| except: |
| reverse[rk]=k |
| |
| sources = [] |
| for k,v in g.items(): |
| if not reverse.has_key(k): |
| sources.append(k) |
| |
| |
| for k,v in reverse.iteritems(): |
| if (not v): |
| sources.append(k) |
| |
| order = [] |
| marked = [] |
| |
| while sources: |
| n = sources.pop() |
| try: |
| for m in g[n]: |
| if m not in marked: |
| sources.append(m) |
| marked.append(m) |
| except KeyError: |
| pass |
| order.append(n) |
| return order |
| |
| class PlanetStackObserver: |
| sync_steps = [SyncNetworks,SyncNetworkSlivers,SyncSites,SyncSitePrivileges,SyncSlices,SyncSliceMemberships,SyncSlivers,SyncSliverIps,SyncExternalRoutes,SyncUsers,GarbageCollector] |
| |
| def __init__(self): |
| # The Condition object that gets signalled by Feefie events |
| self.step_lookup = {} |
| self.load_sync_steps() |
| self.event_cond = threading.Condition() |
| self.driver = OpenStackDriver() |
| |
| def wait_for_event(self, timeout): |
| 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_steps(self): |
| dep_path = Config().observer_backend_dependency_graph |
| 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 |
| # This contains dependencies between backend records |
| self.backend_dependency_graph = json.loads(open(backend_path).read()) |
| except Exception,e: |
| # 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: |
| 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, self.sync_steps) |
| print "Order of steps=",self.ordered_steps |
| self.load_run_times() |
| |
| |
| def check_duration(self): |
| try: |
| if (duration > S.deadline): |
| logger.info('Sync step %s missed deadline, took %.2f seconds'%(S.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[step.name] |
| 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): |
| for failed_step in failed_steps: |
| if (failed_step in self.dependency_graph[step.name]): |
| raise StepNotReady |
| |
| def run(self): |
| if not self.driver.enabled or not self.driver.has_openstack: |
| return |
| |
| while True: |
| try: |
| logger.info('Waiting for event') |
| tBeforeWait = time.time() |
| self.wait_for_event(timeout=300) |
| logger.info('Observer woke up') |
| |
| # Set of whole steps that failed |
| failed_steps = [] |
| |
| # Set of individual objects within steps that failed |
| failed_step_objects = [] |
| |
| for S in self.ordered_steps: |
| step = self.step_lookup[S] |
| start_time=time.time() |
| |
| sync_step = step(driver=self.driver) |
| #sync_step.dependencies = self.dependencies[sync_step.name] |
| 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: |
| logging.info('Step not ready: %s'%sync_step.name) |
| failed_steps.append(sync_step) |
| except: |
| failed_steps.append(sync_step) |
| |
| if (should_run): |
| try: |
| duration=time.time() - start_time |
| |
| # ********* This is the actual sync step |
| failed_objects = sync_step(failed=failed_step_objects) |
| |
| |
| check_deadline(sync_step, duration) |
| failed_step_objects.extend(failed_objects) |
| self.update_run_time(sync_step) |
| except: |
| failed_steps.add(S) |
| self.save_run_times() |
| except: |
| logger.log_exc("Exception in observer run loop") |
| traceback.print_exc() |