91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
import collections
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import copy
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from orchestra.utils.python import AttrDict
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from .backends import ServiceBackend, ServiceController, replace
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class Operation():
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DELETE = 'delete'
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SAVE = 'save'
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MONITOR = 'monitor'
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EXCEEDED = 'exceeded'
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RECOVERY = 'recovery'
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def __str__(self):
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return '%s.%s(%s)' % (self.backend, self.action, self.instance)
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def __repr__(self):
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return str(self)
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def __hash__(self):
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""" set() """
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return hash((self.backend, self.instance, self.action))
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def __eq__(self, operation):
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""" set() """
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return hash(self) == hash(operation)
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def __init__(self, backend, instance, action, routes=None):
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self.backend = backend
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# instance should maintain any dynamic attribute until backend execution
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# deep copy is prefered over copy otherwise objects will share same atributes (queryset cache)
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self.instance = copy.deepcopy(instance)
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self.action = action
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self.routes = routes
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@classmethod
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def execute(cls, operations, serialize=False, run_async=None):
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from . import manager
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scripts, backend_serialize = manager.generate(operations)
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return manager.execute(scripts, serialize=(serialize or backend_serialize), run_async=run_async)
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@classmethod
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def create_for_action(cls, instances, action):
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if not isinstance(instances, collections.Iterable):
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instances = [instances]
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operations = []
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for instance in instances:
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backends = ServiceBackend.get_backends(instance=instance, action=action)
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for backend_cls in backends:
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operations.append(
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cls(backend_cls, instance, action)
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)
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return operations
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@classmethod
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def execute_action(cls, instances, action):
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""" instances can be an object or an iterable for batch processing """
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operations = cls.create_for_action(instances, action)
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return cls.execute(operations)
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def preload_context(self):
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"""
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Heuristic: Running get_context will prevent most of related objects do not exist errors
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"""
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if self.action == self.DELETE:
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if hasattr(self.backend, 'get_context'):
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self.backend().get_context(self.instance)
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def store(self, log):
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from .models import BackendOperation
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return BackendOperation.objects.create(
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log=log,
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backend=self.backend.get_name(),
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instance=self.instance,
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action=self.action,
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)
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@classmethod
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def load(cls, operation, log=None):
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routes = None
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if log:
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routes = {
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(operation.backend, operation.action): AttrDict(host=log.server)
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}
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return cls(operation.backend_class, operation.instance, operation.action, routes=routes)
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