# -*- coding: utf-8 -*-
"""
flaskbb.core.exceptions
~~~~~~~~~~~~~~~~~~~~~~~
Exceptions raised by flaskbb.core,
forms the root of all exceptions in
FlaskBB.
:copyright: (c) 2014-2018 the FlaskBB Team
:license: BSD, see LICENSE for more details
"""
[docs]class BaseFlaskBBError(Exception):
"""
Root exception for FlaskBB.
"""
[docs]class ValidationError(BaseFlaskBBError):
"""
Used to signal validation errors for things such as
token verification, user registration, etc.
:param str attribute: The attribute the validation error applies to,
if the validation error applies to multiple attributes or to
the entire object, this should be set to None
:param str reason: Why the attribute, collection of attributes or object
is invalid.
"""
def __init__(self, attribute, reason):
self.attribute = attribute
self.reason = reason
super(ValidationError, self).__init__((attribute, reason))
[docs]class StopValidation(BaseFlaskBBError):
"""
Raised from validation handlers to signal that
validation should end immediately and no further
processing should be done.
Can also be used to communicate all errors
raised during a validation run.
:param reasons: A sequence of `(attribute, reason)` pairs explaining
why the object is invalid.
"""
def __init__(self, reasons):
self.reasons = reasons
super(StopValidation, self).__init__(reasons)
class PersistenceError(BaseFlaskBBError):
"""
Used to catch down errors when persisting models to the database instead
of letting all issues percolate up, this should be raised from those
exceptions without smashing their tracebacks. Example::
try:
db.session.add(new_user)
db.session.commit()
except Exception:
raise PersistenceError("Couldn't save user account")
"""
def accumulate_errors(caller, validators, throw=True):
errors = []
for validator in validators:
try:
caller(validator)
except ValidationError as e:
errors.append((e.attribute, e.reason))
if len(errors) and throw:
raise StopValidation(errors)
return errors
