Added ec2 observer, WIP
diff --git a/planetstack/ec2_observer/event_loop.py b/planetstack/ec2_observer/event_loop.py
new file mode 100644
index 0000000..02725be
--- /dev/null
+++ b/planetstack/ec2_observer/event_loop.py
@@ -0,0 +1,310 @@
+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 ec2_observer.steps import *
+from syncstep import SyncStep
+from toposort import toposort
+from ec2_observer.error_mapper import error_mapper
+
+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):
+ 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, deletion):
+ if (not deletion):
+ self.last_run_times[step.__name__]=time.time()
+ else:
+ self.last_deletion_run_times[step.__name__]=time.time()
+
+
+ def check_schedule(self, step, deletion):
+ last_run_times = self.last_run_times if not deletion else self.last_deletion_run_times
+
+ time_since_last_run = time.time() - 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
+ try:
+ jrun_times = open('/tmp/observer_deletion_run_times').read()
+ self.last_deletion_run_times = json.loads(jrun_times)
+ except:
+ self.last_deletion_run_times={}
+ for e in self.ordered_steps:
+ self.last_deletion_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)
+
+ deletion_run_times = json.dumps(self.last_deletion_run_times)
+ open('/tmp/observer_deletion_run_times','w').write(deletion_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(self):
+ if not self.driver.enabled:
+ return
+ if (self.driver_kind=="openstack") and (not self.driver.has_openstack):
+ return
+
+ while True:
+ try:
+ error_map_file = getattr(Config(), "error_map_path", "/opt/planetstack/error_map.txt")
+ error_mapper = ErrorMapper(error_map_file)
+
+ logger.info('Waiting for event')
+ tBeforeWait = time.time()
+ self.wait_for_event(timeout=30)
+ logger.info('Observer woke up')
+
+ # Two passes. One for sync, the other for deletion.
+ for deletion in (False,True):
+ logger.info('Creation pass...')
+ # Set of whole steps that failed
+ failed_steps = []
+
+ # Set of individual objects within steps that failed
+ failed_step_objects = set()
+
+ ordered_steps = self.ordered_steps if not deletion else reversed(self.ordered_steps)
+
+ for S in ordered_steps:
+ step = self.step_lookup[S]
+ start_time=time.time()
+
+ sync_step = step(driver=self.driver,error_map=error_mapper)
+ 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,deletion) # 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 Exception,e:
+ logging.error('%r',e)
+ logger.log_exc("sync step failed: %r. Deletion: %r"%(sync_step,deletion))
+ 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), deletion=deletion)
+
+
+ self.check_duration(sync_step, duration)
+ if failed_objects:
+ failed_step_objects.update(failed_objects)
+
+ if (not deletion):
+ self.update_run_time(sync_step)
+ else:
+ self.update_deletion_run_time(sync_step)
+ except Exception,e:
+ logging.error('Model step failed. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!',e)
+ logger.log_exc(e)
+ failed_steps.append(S)
+ self.save_run_times()
+ except Exception, e:
+ logging.error('Core error. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!',e)
+ logger.log_exc("Exception in observer run loop")
+ traceback.print_exc()