def __init__(self, operation, module, model, index=None, gl=None):
self.operation = operation
self.model = model
self.index = index
self.module = module
# Get the current state from OVSDB
self.rowobj = Row(self.module, index)
self.row = self.rowobj.getrow()
# globals() or __dict__
self.gl = gl
self.params = tuple(__n__['types'][self.module].keys())
class CRUD:
# This constructor automatically generates state variables:
# _param, _param_ and param_
def __init__(self, operation, module, model, index=None, gl=None):
self.operation = operation
self.model = model
self.index = index
self.module = module
# Get the current state from OVSDB
self.rowobj = Row(self.module, index)
self.row = self.rowobj.getrow()
# globals() or __dict__
self.gl = gl
self.params = tuple(__n__['types'][self.module].keys())
def getparam(self, *args):
for key in args:
if key in self.model:
if self.model[key] == '':
yield None
else:
yield self.model[key]
else:
yield None
def _set_params(self):
init = False
if __n__['init'] == 'start':
init = True
for key in self.params:
# New values: requested changes
_key = '_'+key
if key in self.model:
if self.model[key] == '':
self.gl[_key] = None
else:
if self.operation == 'delete':
self.gl[_key] = self.row[key]
else: # add/update
self.gl[_key] = self.model[key]
else:
self.gl[_key] = None
# Old values stored in OVSDB
key_ = key+'_'
if self.row and key in self.row and not init:
self.gl[key_] = self.row[key]
else: # including __n__['init'] == 'start'
self.gl[key_] = None
# New or Old values: desired state
_key_ = '_'+key+'_'
if self.gl[_key] == None:
# Desired state: old value
self.gl[_key_] = self.gl[key_]
else:
if self.operation == 'add' or self.operation == 'update':
# Desired state: new value
self.gl[_key_] = self.gl[_key]
else: # 'delete'
# Desierd state: None
self.gl[_key_] = None
# ovdsb.Row.crud
def finalize(self):
self.rowobj.crud(self.operation, self.model)
### Context manager ###
def __enter__(self):
if not self.gl:
# Obtains gloabls
cf = inspect.currentframe()
of = inspect.getouterframes(cf)
self.gl = of[1][0].f_globals
# Generates _param, _param_ and param_
self._set_params()
__n__['logger'].debug('CRUD.params()')
def __exit__(self, type, value, traceback):
if type == ModelError:
value.model = self.model
__n__['logger'].debug('CRUD.__exit__, exception detected')
return False # Re-raises the exception
elif type: # Exceptions other than ModelError
__n__['logger'].debug('CRUD.__exit__, exception detected')
return False # Re-raises the exception
else:
__n__['logger'].debug('CRUD.__exit__, self.finalize()')
self.finalize()
