def __get__(self, item, item_class):
wrapper = self.get_wrapper()
compat.set_func_name(wrapper, self.func_name)
compat.set_func_doc(wrapper, compat.get_func_doc(self.func))
try:
# python 2.6
wrapper.func_dict['cnd'] = self.conditions
except AttributeError:
# python 3
wrapper.__dict__['cnd'] = self.conditions
return types.MethodType(wrapper, item) # , item_class)
def __get__(self, item, item_class):
wrapper = self.get_wrapper()
compat.set_func_name(wrapper, self.func_name)
compat.set_func_doc(wrapper, compat.get_func_doc(self.func))
try:
# python 2.6
wrapper.func_dict['cnd'] = self.conditions
except AttributeError:
# python 3
wrapper.__dict__['cnd'] = self.conditions
return types.MethodType(wrapper, item) # , item_class)
def requires_transactional_context(function):
"""
Use this descriptor to ensure that a function or method is
run in a transactional context. Required for functions/methods that perform
database updates.
"""
def rtc_wrapper(*args, **kwargs):
if not context._is_txnal:
raise exceptions.InternalServerError(
"Not in a transactional context. Use @db.transactional().")
return function(*args, **kwargs)
compat.set_func_name(rtc_wrapper, compat.get_func_name(function))
compat.set_func_doc(rtc_wrapper, compat.get_func_doc(function))
rtc_wrapper.__module__ = function.__module__
return rtc_wrapper
def __get__(self, item, item_class):
def wm_wrapper(item, context):
if utils.permsresolver.get_access(item, context.user) == 0:
raise exceptions.PermissionDenied
context.response.content_type = self.content_type
context.response.charset = self.encoding
if self.max_age is not None:
context.response.set_expiration(self.max_age)
return self.execute(item, context)
compat.set_func_name(wm_wrapper, self.func_name)
compat.set_func_doc(wm_wrapper, compat.get_func_doc(self.func))
try:
# python 2.6
wm_wrapper.func_dict['cnd'] = self.conditions
except AttributeError:
# python 3
wm_wrapper.__dict__['cnd'] = self.conditions
return types.MethodType(wm_wrapper, item) # , item_class)
def __get__(self, item, item_class):
def wm_wrapper(item, context):
if utils.permsresolver.get_access(item, context.user) == 0:
raise exceptions.PermissionDenied
context.response.content_type = self.content_type
context.response.charset = self.encoding
if self.max_age is not None:
context.response.set_expiration(self.max_age)
return self.execute(item, context)
compat.set_func_name(wm_wrapper, self.func_name)
compat.set_func_doc(wm_wrapper, compat.get_func_doc(self.func))
try:
# python 2.6
wm_wrapper.func_dict['cnd'] = self.conditions
except AttributeError:
# python 3
wm_wrapper.__dict__['cnd'] = self.conditions
return types.MethodType(wm_wrapper, item) # , item_class)
def transactional_decorator(function):
"""
This is the descriptor for making a function or a Web method
transactional.
"""
def transactional_wrapper(*args):
# check if running in a replicated site and is master
rep_mgr = _db.get_replication_manager()
if rep_mgr is not None and not rep_mgr.is_master():
# TODO: abort txn in chained calls?
raise exceptions.DBReadOnly(
'Attempted write operation in read-only database.')
has_txn = False
txn_flags = 0
if not context._is_txnal:
if context._trans is not None:
# abort previous txn
context._trans.abort()
has_txn = True
txn_flags = context._trans._flags
# create new txn handle
txn = _db.get_transaction(nosync=nosync)
context._trans = txn
is_top_level = True
context._is_txnal = True
else:
txn = context._trans
is_top_level = False
retries = 0
sleep_time = _min_sleep_time
try:
while retries < txn.txn_max_retries:
try:
if is_top_level:
cargs = copy.deepcopy(args, {'_dup_ext_': False})
if retries > 0:
time.sleep(sleep_time)
sleep_time *= 2
if sleep_time > _max_sleep_time:
sleep_time = _max_sleep_time + \
(retries * _min_sleep_time)
txn._retry()
else:
cargs = args
val = function(*cargs)
if is_top_level and auto_commit:
txn.commit()
return val
except exceptions.DBRetryTransaction:
if is_top_level:
retries += 1
else:
# allow propagation
raise
except:
txn.abort()
raise
# maximum retries exceeded
raise exceptions.DBDeadlockError
finally:
if is_top_level:
if has_txn:
context._trans = _db.get_transaction(flags=txn_flags)
else:
context._trans = None
context._is_txnal = False
compat.set_func_name(transactional_wrapper,
compat.get_func_name(function))
compat.set_func_doc(transactional_wrapper,
compat.get_func_doc(function))
transactional_wrapper.__module__ = function.__module__
return transactional_wrapper
