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import datetime
import decimal
import logging
import six
from sqlalchemy.orm import class_mapper
from sqlalchemy.orm.properties import ColumnProperty, RelationProperty
import sqlalchemy.types
import wsme.types
log = logging.getLogger(__name__)
class SQLAlchemyRegistry(object):
@classmethod
def get(cls, registry):
if not hasattr(registry, 'sqlalchemy'):
registry.sqlalchemy = cls()
return registry.sqlalchemy
def __init__(self):
self.types = {}
self.satypeclasses = {
sqlalchemy.types.Integer: int,
sqlalchemy.types.Boolean: bool,
sqlalchemy.types.Float: float,
sqlalchemy.types.Numeric: decimal.Decimal,
sqlalchemy.types.Date: datetime.date,
sqlalchemy.types.Time: datetime.time,
sqlalchemy.types.DateTime: datetime.datetime,
sqlalchemy.types.String: wsme.types.text,
sqlalchemy.types.Unicode: wsme.types.text,
}
def getdatatype(self, sadatatype):
if sadatatype.__class__ in self.satypeclasses:
return self.satypeclasses[sadatatype.__class__]
elif sadatatype in self.types:
return self.types[sadatatype]
else:
return sadatatype.__name__
def register_saclass(registry, saclass, typename=None):
"""Associate a webservice type name to a SQLAlchemy mapped class.
The default typename if the saclass name itself.
"""
if typename is None:
typename = saclass.__name__
SQLAlchemyRegistry.get(registry).types[saclass] = typename
class wsattr(wsme.types.wsattr):
def __init__(self, datatype, saproperty=None, **kw):
super(wsattr, self).__init__(datatype, **kw)
self.saname = saproperty.key
self.saproperty = saproperty
self.isrelation = isinstance(saproperty, RelationProperty)
def make_wsattr(registry, saproperty):
datatype = None
if isinstance(saproperty, ColumnProperty):
if len(saproperty.columns) > 1:
log.warning("Cannot handle multi-column ColumnProperty")
return None
datatype = SQLAlchemyRegistry.get(registry).getdatatype(
saproperty.columns[0].type)
elif isinstance(saproperty, RelationProperty):
other_saclass = saproperty.mapper.class_
datatype = SQLAlchemyRegistry.get(registry).getdatatype(other_saclass)
if saproperty.uselist:
datatype = [datatype]
else:
log.warning("Don't know how to handle %s attributes" %
saproperty.__class__)
if datatype:
return wsattr(datatype, saproperty)
class BaseMeta(wsme.types.BaseMeta):
def __new__(cls, name, bases, dct):
if '__registry__' not in dct:
dct['__registry__'] = wsme.types.registry
return type.__new__(cls, name, bases, dct)
def __init__(cls, name, bases, dct):
saclass = getattr(cls, '__saclass__', None)
if saclass:
mapper = class_mapper(saclass)
cls._pkey_attrs = []
cls._ref_attrs = []
for prop in mapper.iterate_properties:
key = prop.key
if hasattr(cls, key):
continue
if key.startswith('_'):
continue
attr = make_wsattr(cls.__registry__, prop)
if attr is not None:
setattr(cls, key, attr)
if attr and isinstance(prop, ColumnProperty) and \
prop.columns[0] in mapper.primary_key:
cls._pkey_attrs.append(attr)
cls._ref_attrs.append(attr)
register_saclass(cls.__registry__, cls.__saclass__, cls.__name__)
super(BaseMeta, cls).__init__(name, bases, dct)
class Base(six.with_metaclass(BaseMeta, wsme.types.Base)):
def __init__(self, instance=None, keyonly=False, attrs=None, eagerload=[]):
if instance:
self.from_instance(instance, keyonly, attrs, eagerload)
def from_instance(self, instance, keyonly=False, attrs=None, eagerload=[]):
if keyonly:
attrs = self._pkey_attrs + self._ref_attrs
for attr in self._wsme_attributes:
if not isinstance(attr, wsattr):
continue
if attrs and not attr.isrelation and not attr.name in attrs:
continue
if attr.isrelation and not attr.name in eagerload:
continue
value = getattr(instance, attr.saname)
if attr.isrelation:
attr_keyonly = attr.name not in eagerload
attr_attrs = None
attr_eagerload = []
if not attr_keyonly:
attr_attrs = [
aname[len(attr.name) + 1:]
for aname in attrs
if aname.startswith(attr.name + '.')
]
attr_eagerload = [
aname[len(attr.name) + 1:]
for aname in eagerload
if aname.startswith(attr.name + '.')
]
if attr.saproperty.uselist:
value = [
attr.datatype.item_type(
o,
keyonly=attr_keyonly,
attrs=attr_attrs,
eagerload=attr_eagerload
)
for o in value
]
else:
value = attr.datatype(
value,
keyonly=attr_keyonly,
attrs=attr_attrs,
eagerload=attr_eagerload
)
attr.__set__(self, value)
def to_instance(self, instance):
for attr in self._wsme_attributes:
if isinstance(attr, wsattr):
value = attr.__get__(self, self.__class__)
if value is not wsme.types.Unset:
setattr(instance, attr.saname, value)
def get_ref_criterion(self):
"""Returns a criterion that match a database object
having the pkey/ref attribute values of this webservice object"""
criterions = []
for attr in self._pkey_attrs + self._ref_attrs:
value = attr.__get__(self, self.__class__)
if value is not wsme.types.Unset:
criterions.append(attr.saproperty == value)
def generate_types(*classes, **kw):
registry = kw.pop('registry', wsme.types.registry)
prefix = kw.pop('prefix', '')
postfix = kw.pop('postfix', '')
makename = kw.pop('makename', lambda s: prefix + s + postfix)
newtypes = {}
for c in classes:
if isinstance(c, list):
newtypes.update(generate_types(c))
else:
name = makename(c.__name__)
newtypes[name] = BaseMeta(name, (Base, ), {
'__saclass__': c,
'__registry__': registry
})
return newtypes
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