| import os |
| import imp |
| import inspect |
| import time |
| import sys |
| import traceback |
| import commands |
| import threading |
| import json |
| import pdb |
| import pprint |
| |
| |
| from datetime import datetime |
| from collections import defaultdict |
| from core.models import * |
| from django.db.models import F, Q |
| from django.db import connection |
| from django.db import reset_queries |
| #from openstack.manager import OpenStackManager |
| from openstack.driver import OpenStackDriver |
| from xos.logger import Logger, logging, logger |
| #from timeout import timeout |
| from xos.config import Config, XOS_DIR |
| from synchronizers.base.steps import * |
| from syncstep import SyncStep |
| from toposort import toposort |
| from synchronizers.base.error_mapper import * |
| from synchronizers.openstack.openstacksyncstep import OpenStackSyncStep |
| from synchronizers.base.steps.sync_object import SyncObject |
| |
| # Load app models |
| |
| try: |
| app_module_names = Config().observer_applist.split(',') |
| except AttributeError: |
| app_module_names = [] |
| |
| if (type(app_module_names)!=list): |
| app_module_names=[app_module_names] |
| |
| app_modules = [] |
| |
| for m in app_module_names: |
| model_path = m+'.models' |
| module = __import__(model_path,fromlist=[m]) |
| app_modules.append(module) |
| |
| |
| debug_mode = False |
| |
| class bcolors: |
| HEADER = '\033[95m' |
| OKBLUE = '\033[94m' |
| OKGREEN = '\033[92m' |
| WARNING = '\033[93m' |
| FAIL = '\033[91m' |
| ENDC = '\033[0m' |
| BOLD = '\033[1m' |
| UNDERLINE = '\033[4m' |
| |
| logger = Logger(level=logging.INFO) |
| |
| class StepNotReady(Exception): |
| pass |
| |
| class NoOpDriver: |
| def __init__(self): |
| self.enabled = True |
| self.dependency_graph = None |
| |
| STEP_STATUS_WORKING=1 |
| STEP_STATUS_OK=2 |
| STEP_STATUS_KO=3 |
| |
| def invert_graph(g): |
| ig = {} |
| for k,v in g.items(): |
| for v0 in v: |
| try: |
| ig[v0].append(k) |
| except: |
| ig[v0]=[k] |
| return ig |
| |
| class XOSObserver: |
| 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") |
| self.observer_name = getattr(Config(), "observer_name", "") |
| if self.driver_kind=="openstack": |
| self.driver = OpenStackDriver() |
| else: |
| self.driver = NoOpDriver() |
| |
| def consolePrint(self, what): |
| if getattr(Config(), "observer_console_print", True): |
| print what |
| |
| 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 = XOS_DIR + "/synchronizers/openstack/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) or issubclass(c,OpenStackSyncStep)) 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])) |
| |
| 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()) |
| for left,lst in self.model_dependency_graph.items(): |
| new_lst = [] |
| for k in lst: |
| try: |
| tup = (k,k.lower()) |
| new_lst.append(tup) |
| deps = self.model_dependency_graph[k] |
| except: |
| self.model_dependency_graph[k] = [] |
| |
| self.model_dependency_graph[left] = new_lst |
| 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()) |
| for k,v in self.backend_dependency_graph.items(): |
| try: |
| self.model_dependency_graph[k].extend(v) |
| except KeyError: |
| self.model_dependency_graphp[k] = v |
| |
| 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 = {} |
| phantom_steps = [] |
| for k,v in self.model_dependency_graph.items(): |
| try: |
| for source in provides_dict[k]: |
| if (not v): |
| step_graph[source] = [] |
| |
| 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: |
| if (not provides_dict.has_key(m)): |
| try: |
| step_graph[source]+=['#%s'%m] |
| except: |
| step_graph[source]=['#%s'%m] |
| |
| phantom_steps+=['#%s'%m] |
| pass |
| |
| except KeyError: |
| pass |
| # no dependencies, pass |
| |
| |
| self.dependency_graph = step_graph |
| self.deletion_dependency_graph = invert_graph(step_graph) |
| |
| pp = pprint.PrettyPrinter(indent=4) |
| logger.info(pp.pformat(step_graph)) |
| self.ordered_steps = toposort(self.dependency_graph, phantom_steps+map(lambda s:s.__name__,self.sync_steps)) |
| self.ordered_steps = [i for i in self.ordered_steps if i!='SyncObject'] |
| |
| logger.info("Order of steps=%s" % 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/%sobserver_run_times'%self.observer_name).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/%sobserver_deletion_run_times'%self.observer_name).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 lookup_step_class(self,s): |
| if ('#' in s): |
| return SyncObject |
| else: |
| step = self.step_lookup[s] |
| return step |
| |
| def lookup_step(self,s): |
| if ('#' in s): |
| objname = s[1:] |
| so = SyncObject() |
| |
| try: |
| obj = globals()[objname] |
| except: |
| for m in app_modules: |
| if (hasattr(m,objname)): |
| obj = getattr(m,objname) |
| |
| so.provides=[obj] |
| so.observes=[obj] |
| step = so |
| else: |
| step_class = self.step_lookup[s] |
| step = step_class(driver=self.driver,error_map=self.error_mapper) |
| return step |
| |
| def save_run_times(self): |
| run_times = json.dumps(self.last_run_times) |
| open('/tmp/%sobserver_run_times'%self.observer_name,'w').write(run_times) |
| |
| deletion_run_times = json.dumps(self.last_deletion_run_times) |
| open('/tmp/%sobserver_deletion_run_times'%self.observer_name,'w').write(deletion_run_times) |
| |
| def check_class_dependency(self, step, failed_steps): |
| step.dependenices = [] |
| for obj in step.provides: |
| lst = self.model_dependency_graph.get(obj.__name__, []) |
| nlst = map(lambda(a,b):b,lst) |
| step.dependenices.extend(nlst) |
| for failed_step in failed_steps: |
| if (failed_step in step.dependencies): |
| raise StepNotReady |
| |
| def sync(self, S, deletion): |
| try: |
| step = self.lookup_step_class(S) |
| start_time=time.time() |
| |
| logger.info("Starting to work on step %s, deletion=%s" % (step.__name__, str(deletion))) |
| |
| dependency_graph = self.dependency_graph if not deletion else self.deletion_dependency_graph |
| step_conditions = self.step_conditions# if not deletion else self.deletion_step_conditions |
| step_status = self.step_status# if not deletion else self.deletion_step_status |
| |
| # Wait for step dependencies to be met |
| try: |
| deps = dependency_graph[S] |
| has_deps = True |
| except KeyError: |
| has_deps = False |
| |
| go = True |
| |
| failed_dep = None |
| if (has_deps): |
| for d in deps: |
| if d==step.__name__: |
| logger.info(" step %s self-wait skipped" % step.__name__) |
| go = True |
| continue |
| |
| cond = step_conditions[d] |
| cond.acquire() |
| if (step_status[d] is STEP_STATUS_WORKING): |
| logger.info(" step %s wait on dep %s" % (step.__name__, d)) |
| cond.wait() |
| elif step_status[d] == STEP_STATUS_OK: |
| go = True |
| else: |
| go = False |
| failed_dep = d |
| cond.release() |
| if (not go): |
| break |
| else: |
| go = True |
| |
| if (not go): |
| self.consolePrint(bcolors.FAIL + "Step %r skipped on %r" % (step,failed_dep) + bcolors.ENDC) |
| # SMBAKER: sync_step was not defined here, so I changed |
| # this from 'sync_step' to 'step'. Verify. |
| self.failed_steps.append(step) |
| my_status = STEP_STATUS_KO |
| else: |
| sync_step = self.lookup_step(S) |
| sync_step. __name__= step.__name__ |
| sync_step.dependencies = [] |
| try: |
| mlist = sync_step.provides |
| |
| try: |
| for m in mlist: |
| lst = self.model_dependency_graph[m.__name__] |
| nlst = map(lambda(a,b):b,lst) |
| sync_step.dependencies.extend(nlst) |
| except Exception,e: |
| raise e |
| |
| 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, self.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: |
| logger.info('Step not ready: %s'%sync_step.__name__) |
| self.failed_steps.append(sync_step) |
| my_status = STEP_STATUS_KO |
| except Exception,e: |
| logger.error('%r' % e) |
| logger.log_exc("sync step failed: %r. Deletion: %r"%(sync_step,deletion)) |
| self.failed_steps.append(sync_step) |
| my_status = STEP_STATUS_KO |
| |
| if (should_run): |
| try: |
| duration=time.time() - start_time |
| |
| logger.info('Executing step %s, deletion=%s' % (sync_step.__name__, deletion)) |
| |
| self.consolePrint(bcolors.OKBLUE + "Executing step %s" % sync_step.__name__ + bcolors.ENDC) |
| failed_objects = sync_step(failed=list(self.failed_step_objects), deletion=deletion) |
| |
| self.check_duration(sync_step, duration) |
| |
| if failed_objects: |
| self.failed_step_objects.update(failed_objects) |
| |
| logger.info("Step %r succeeded" % sync_step.__name__) |
| self.consolePrint(bcolors.OKGREEN + "Step %r succeeded" % sync_step.__name__ + bcolors.ENDC) |
| my_status = STEP_STATUS_OK |
| self.update_run_time(sync_step,deletion) |
| except Exception,e: |
| self.consolePrint(bcolors.FAIL + "Model step %r failed" % (sync_step.__name__) + bcolors.ENDC) |
| logger.error('Model step %r failed. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!' % (sync_step.__name__, e)) |
| logger.log_exc("Exception in sync step") |
| self.failed_steps.append(S) |
| my_status = STEP_STATUS_KO |
| else: |
| logger.info("Step %r succeeded due to non-run" % step) |
| my_status = STEP_STATUS_OK |
| |
| try: |
| my_cond = step_conditions[S] |
| my_cond.acquire() |
| step_status[S]=my_status |
| my_cond.notify_all() |
| my_cond.release() |
| except KeyError,e: |
| logger.info('Step %r is a leaf' % step) |
| pass |
| finally: |
| try: |
| reset_queries() |
| except: |
| # this shouldn't happen, but in case it does, catch it... |
| logger.log_exc("exception in reset_queries") |
| |
| connection.close() |
| |
| def run(self): |
| if not self.driver.enabled: |
| return |
| |
| if (self.driver_kind=="openstack") and (not self.driver.has_openstack): |
| return |
| |
| while True: |
| logger.info('Waiting for event') |
| self.wait_for_event(timeout=5) |
| logger.info('Observer woke up') |
| |
| self.run_once() |
| |
| def run_once(self): |
| try: |
| loop_start = time.time() |
| error_map_file = getattr(Config(), "error_map_path", XOS_DIR + "/error_map.txt") |
| self.error_mapper = ErrorMapper(error_map_file) |
| |
| # Two passes. One for sync, the other for deletion. |
| for deletion in [False,True]: |
| # Set of individual objects within steps that failed |
| self.failed_step_objects = set() |
| |
| # Set up conditions and step status |
| # This is needed for steps to run in parallel |
| # while obeying dependencies. |
| |
| providers = set() |
| dependency_graph = self.dependency_graph if not deletion else self.deletion_dependency_graph |
| |
| for v in dependency_graph.values(): |
| if (v): |
| providers.update(v) |
| |
| self.step_conditions = {} |
| self.step_status = {} |
| |
| for p in list(providers): |
| self.step_conditions[p] = threading.Condition() |
| |
| self.step_status[p] = STEP_STATUS_WORKING |
| |
| self.failed_steps = [] |
| |
| threads = [] |
| logger.info('Deletion=%r...'%deletion) |
| schedule = self.ordered_steps if not deletion else reversed(self.ordered_steps) |
| |
| for S in schedule: |
| thread = threading.Thread(target=self.sync, args=(S, deletion)) |
| |
| logger.info('Deletion=%r...'%deletion) |
| threads.append(thread) |
| |
| # Start threads |
| for t in threads: |
| t.start() |
| |
| # another spot to clean up debug state |
| try: |
| reset_queries() |
| except: |
| # this shouldn't happen, but in case it does, catch it... |
| logger.log_exc("exception in reset_queries") |
| |
| # Wait for all threads to finish before continuing with the run loop |
| for t in threads: |
| t.join() |
| |
| self.save_run_times() |
| |
| loop_end = time.time() |
| open('/tmp/%sobserver_last_run'%self.observer_name,'w').write(json.dumps({'last_run': loop_end, 'last_duration':loop_end - loop_start})) |
| except Exception, e: |
| logger.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() |