如何才能子类endpoints.ServiceException？

问题描述

文档在的。然而，子类不能真正表达任何字符串消息，state和http代码之外的任何内容。

对于任何具有更智能异常处理的应用程序，错误都需要携带更多

如何才能子类异常类，提供一个自定义的消息/状态？

解决方案

目前，无法扩展有效负载，但您可以自定义状态码。 <$ c对于 400 错误，$ c> endpoints.api_exceptions ：

<$ p $ b $ import httplib
class BadRequestException（ServiceException）：
请求异常映射到400响应。
http_status = httplib。 BAD_REQUEST


状态码的当前列表（截至2013年5月8日）支持fo r错误是：

• httplib.BAD_REQUEST ：400


• httplib.UNAUTHORIZED ：401


• httplib.FORBIDDEN ：403


• httplib.NOT_FOUND ：404


• httplib。 CONFLICT


• httplib.GONE ：410


• httplib.PRECONDITION_FAILED ：412


• httplib.REQUEST_ENTITY_TOO_LARGE ：413

这些状态码将被映射到其他代码：

• httplib.PAYMENT_REQUIRED ：402映射到404


• httplib.METHOD_NOT_ALLOWED ：405映射到501


• httplib.NOT_ACCEPTABLE ：406映射到404


• code> httplib.PROXY_AUTHENTICATION_REQUIRED ：407映射到404


• httplib.REQUEST_TIMEOUT ：408映射到503


• httplib.LENGTH_REQUIRED ：411映射到404


• httplib.REQUEST_URI_TOO_LONG ：414映射到404


• httplib.UNSUPPORTED_MEDIA_TYPE ：415映射到404


• httplib.REQUESTED_RANGE_NOT_SATISFIABLE ：416映射到404


• httplib.EXPECTATION_FAILED ：417映射到404

另外，如果您的回复是 message_types.VoidMessage 对象，您将能够发送 204 无内容响应（ httplib.NO_CONTENT ）。

The documentation mentions "subclassing endpoints.ServiceException" at https://developers.google.com/appengine/docs/python/endpoints/exceptions. However, subclasses can't really express anything beyond a string message, "state" and http code.

For any application to have smarter exception handling, errors need to carry more than this.

How can one subclass the exception class, providing a custom message/state?

解决方案

Currently, there is no way to extend the payload, but you can customize the status code.

As is done in endpoints.api_exceptions for a 400 error:

import httplib
class BadRequestException(ServiceException):
  """Bad request exception that is mapped to a 400 response."""
  http_status = httplib.BAD_REQUEST

The current list (as of 5/8/2013) of status codes supported for errors are:

• httplib.BAD_REQUEST: 400
• httplib.UNAUTHORIZED: 401
• httplib.FORBIDDEN: 403
• httplib.NOT_FOUND: 404
• httplib.CONFLICT: 409
• httplib.GONE: 410
• httplib.PRECONDITION_FAILED: 412
• httplib.REQUEST_ENTITY_TOO_LARGE: 413

and these status codes will be mapped to other codes:

• httplib.PAYMENT_REQUIRED: 402 mapped to 404
• httplib.METHOD_NOT_ALLOWED: 405 mapped to 501
• httplib.NOT_ACCEPTABLE: 406 mapped to 404
• httplib.PROXY_AUTHENTICATION_REQUIRED: 407 mapped to 404
• httplib.REQUEST_TIMEOUT: 408 mapped to 503
• httplib.LENGTH_REQUIRED: 411 mapped to 404
• httplib.REQUEST_URI_TOO_LONG: 414 mapped to 404
• httplib.UNSUPPORTED_MEDIA_TYPE: 415 mapped to 404
• httplib.REQUESTED_RANGE_NOT_SATISFIABLE: 416 mapped to 404
• httplib.EXPECTATION_FAILED: 417 mapped to 404

In addition if your response is a message_types.VoidMessage object, you will be able to send 204 no content response (httplib.NO_CONTENT).

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