61 lines
2 KiB
Python
61 lines
2 KiB
Python
import copy
|
|
|
|
from .backends import ServiceBackend, ServiceController, replace
|
|
|
|
|
|
class Operation():
|
|
DELETE = 'delete'
|
|
SAVE = 'save'
|
|
MONITOR = 'monitor'
|
|
EXCEEDED = 'exceeded'
|
|
RECOVERY = 'recovery'
|
|
|
|
def __str__(self):
|
|
return '%s.%s(%s)' % (self.backend, self.action, self.instance)
|
|
|
|
def __hash__(self):
|
|
""" set() """
|
|
return hash(self.backend) + hash(self.instance) + hash(self.action)
|
|
|
|
def __eq__(self, operation):
|
|
""" set() """
|
|
return hash(self) == hash(operation)
|
|
|
|
def __init__(self, backend, instance, action, servers=None):
|
|
self.backend = backend
|
|
# instance should maintain any dynamic attribute until backend execution
|
|
# deep copy is prefered over copy otherwise objects will share same atributes (queryset cache)
|
|
self.instance = copy.deepcopy(instance)
|
|
self.action = action
|
|
self.servers = servers
|
|
|
|
@classmethod
|
|
def execute(cls, operations, async=False):
|
|
from . import manager
|
|
scripts, block = manager.generate(operations)
|
|
return manager.execute(scripts, block=block, async=async)
|
|
|
|
@classmethod
|
|
def execute_action(cls, instance, action):
|
|
backends = ServiceBackend.get_backends(instance=instance, action=action)
|
|
operations = [cls(backend_cls, instance, action) for backend_cls in backends]
|
|
return cls.execute(operations)
|
|
|
|
def preload_context(self):
|
|
"""
|
|
Heuristic
|
|
Running get_context will prevent most of related objects do not exist errors
|
|
"""
|
|
if self.action == self.DELETE:
|
|
if hasattr(self.backend, 'get_context'):
|
|
self.backend().get_context(self.instance)
|
|
|
|
def store(self, log):
|
|
from .models import BackendOperation
|
|
return BackendOperation.objects.create(
|
|
log=log,
|
|
backend=self.backend.get_name(),
|
|
instance=self.instance,
|
|
action=self.action,
|
|
)
|