72 lines
2.9 KiB
Python
72 lines
2.9 KiB
Python
# -*- coding: utf8 -*-
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import functools
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import inspect
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import horizon.exceptions
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def handle_errors(error_message, error_default=None, request_arg=None):
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"""A decorator for adding default error handling to API calls.
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It wraps the original method in a try-except block, with horizon's
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error handling added.
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Note: it should only be used on functions or methods that take request as
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their argument (it has to be named "request", or ``request_arg`` has to be
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provided, indicating which argument is the request).
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The decorated method accepts a number of additional parameters:
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:param _error_handle: whether to handle the errors in this call
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:param _error_message: override the error message
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:param _error_default: override the default value returned on error
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:param _error_redirect: specify a redirect url for errors
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:param _error_ignore: ignore known errors
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"""
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def decorator(func):
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# XXX This is an ugly hack for finding the 'request' argument.
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if request_arg is None:
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for _request_arg, name in enumerate(inspect.getargspec(func).args):
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if name == 'request':
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break
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else:
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raise RuntimeError(
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"The handle_errors decorator requires 'request' as "
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"an argument of the function or method being decorated")
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else:
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_request_arg = request_arg
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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_error_handle = kwargs.pop('_error_handle', True)
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_error_message = kwargs.pop('_error_message', error_message)
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_error_default = kwargs.pop('_error_default', error_default)
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_error_redirect = kwargs.pop('_error_redirect', None)
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_error_ignore = kwargs.pop('_error_ignore', False)
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if not _error_handle:
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return func(*args, **kwargs)
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try:
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return func(*args, **kwargs)
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except Exception:
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request = args[_request_arg]
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horizon.exceptions.handle(request, _error_message,
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ignore=_error_ignore,
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redirect=_error_redirect)
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return _error_default
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wrapper.wrapped = func
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return wrapper
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return decorator
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