199 lines
7.7 KiB
Python
199 lines
7.7 KiB
Python
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import logging
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import threading
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import traceback
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from collections import OrderedDict
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from django import db
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from django.core.mail import mail_admins
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from orchestra.utils.python import import_class
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from . import settings
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from .backends import ServiceBackend
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from .helpers import send_report
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from .models import BackendLog, BackendOperation as Operation
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from .signals import pre_action, post_action
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logger = logging.getLogger(__name__)
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router = import_class(settings.ORCHESTRATION_ROUTER)
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def as_task(execute):
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def wrapper(*args, **kwargs):
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""" send report """
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# Tasks run on a separate transaction pool (thread), no need to temper with the transaction
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try:
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log = execute(*args, **kwargs)
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if log.state != log.SUCCESS:
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send_report(execute, args, log)
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except Exception as e:
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subject = 'EXCEPTION executing backend(s) %s %s' % (str(args), str(kwargs))
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message = traceback.format_exc()
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logger.error(subject)
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logger.error(message)
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mail_admins(subject, message)
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# We don't propagate the exception further to avoid transaction rollback
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else:
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# Using the wrapper function as threader messenger for the execute output
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# Absense of it will indicate a failure at this stage
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wrapper.log = log
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return log
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return wrapper
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def close_connection(execute):
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""" Threads have their own connection pool, closing it when finishing """
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def wrapper(*args, **kwargs):
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try:
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log = execute(*args, **kwargs)
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except Exception as e:
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pass
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else:
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wrapper.log = log
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finally:
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db.connection.close()
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return wrapper
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def generate(operations):
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scripts = OrderedDict()
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cache = {}
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block = False
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# Generate scripts per server+backend
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for operation in operations:
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logger.debug("Queued %s" % str(operation))
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if operation.servers is None:
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operation.servers = router.get_servers(operation, cache=cache)
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for server in operation.servers:
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key = (server, operation.backend)
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if key not in scripts:
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scripts[key] = (operation.backend(), [operation])
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scripts[key][0].prepare()
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else:
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scripts[key][1].append(operation)
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# Get and call backend action method
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backend = scripts[key][0]
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method = getattr(backend, operation.action)
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kwargs = {
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'sender': backend.__class__,
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'backend': backend,
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'instance': operation.instance,
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'action': operation.action,
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}
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pre_action.send(**kwargs)
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method(operation.instance)
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post_action.send(**kwargs)
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if backend.block:
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block = True
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for value in scripts.values():
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backend, operations = value
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backend.commit()
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return scripts, block
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def execute(scripts, block=False, async=False):
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""" executes the operations on the servers """
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# Execute scripts on each server
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threads = []
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executions = []
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for key, value in scripts.items():
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server, __ = key
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backend, operations = value
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execute = as_task(backend.execute)
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logger.debug('%s is going to be executed on %s' % (backend, server))
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if block:
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# Execute one backend at a time, no need for threads
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execute(server, async=async)
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else:
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execute = close_connection(execute)
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thread = threading.Thread(target=execute, args=(server,), kwargs={'async': async})
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thread.start()
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threads.append(thread)
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executions.append((execute, operations))
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[ thread.join() for thread in threads ]
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logs = []
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# collect results
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for execution, operations in executions:
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# There is no log if an exception has been rised at the very end of the execution
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if hasattr(execution, 'log'):
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for operation in operations:
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logger.info("Executed %s" % str(operation))
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operation.log = execution.log
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if operation.object_id:
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# Not all backends are call with objects saved on the database
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operation.save()
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stdout = execution.log.stdout.strip()
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stdout and logger.debug('STDOUT %s', stdout)
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stderr = execution.log.stderr.strip()
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stderr and logger.debug('STDERR %s', stderr)
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logs.append(execution.log)
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else:
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mocked_log = BackendLog(state=BackendLog.EXCEPTION)
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logs.append(mocked_log)
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return logs
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def collect(instance, action, **kwargs):
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""" collect operations """
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operations = kwargs.get('operations', set())
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route_cache = kwargs.get('route_cache', {})
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for backend_cls in ServiceBackend.get_backends():
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# Check if there exists a related instance to be executed for this backend
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instances = []
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if backend_cls.is_main(instance):
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instances = [(instance, action)]
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else:
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candidate = backend_cls.get_related(instance)
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if candidate:
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if candidate.__class__.__name__ == 'ManyRelatedManager':
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if 'pk_set' in kwargs:
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# m2m_changed signal
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candidates = kwargs['model'].objects.filter(pk__in=kwargs['pk_set'])
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else:
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candidates = candidate.all()
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else:
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candidates = [candidate]
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for candidate in candidates:
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# Check if a delete for candidate is in operations
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delete_mock = Operation.create(backend_cls, candidate, Operation.DELETE)
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if delete_mock not in operations:
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# related objects with backend.model trigger save()
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instances.append((candidate, Operation.SAVE))
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for selected, iaction in instances:
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# Maintain consistent state of operations based on save/delete behaviour
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# Prevent creating a deleted selected by deleting existing saves
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if iaction == Operation.DELETE:
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save_mock = Operation.create(backend_cls, selected, Operation.SAVE)
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try:
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operations.remove(save_mock)
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except KeyError:
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pass
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else:
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update_fields = kwargs.get('update_fields', None)
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if update_fields is not None:
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# "update_fileds=[]" is a convention for explicitly executing backend
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# i.e. account.disable()
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if update_fields != []:
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execute = False
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for field in update_fields:
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if field not in backend_cls.ignore_fields:
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execute = True
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break
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if not execute:
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continue
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operation = Operation.create(backend_cls, selected, iaction)
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# Only schedule operations if the router gives servers to execute into
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servers = router.get_servers(operation, cache=route_cache)
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if servers:
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operation.servers = servers
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if iaction != Operation.DELETE:
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# usually we expect to be using last object state,
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# except when we are deleting it
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operations.discard(operation)
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elif iaction == Operation.DELETE:
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operation.preload_context()
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operations.add(operation)
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return operations
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