禁用Rails中的所有HTML异常呈现 [英] Disable all html exception rendering in rails

问题描述

我开发了一个在json中回答的rest网络服务. 但是，当抛出某些(不是全部)异常时，我无法捕获它们，并且Rails会生成htlm，这对我的所有客户都不是有效的响应. 如果在此catch all调用的方法中引发异常，就会出现问题:

I develop a rest webservice that answers in json. But when some (not all) exceptions are thrown, I am unable to catch them, and rails render an htlm, which is not a valid response for all my clients. The problem comes if an exception is raised in a method called by this catch all:

rescue_from Exception, with: :render_unkown_error

我必须承认，在最后的机会中引发异常是非常非常关键的， 但我想知道:

I have to admit, raising an exception in a last chance catch all is very very critical, but I wonder:

是否有一种方法可以在发生此类错误时完全消除所有的rails响应，而不是返回包含堆栈跟踪的html页面?

Is there a way to totally dismiss all rails response in case of such errors instead of returning an html page containing the stack trace ?

实际上，这个问题也是由于控制器中的未定义属性而引起的:

In fact this problems also comes for an undefined property in my controller:

ActionController::RoutingError (undefined local variable or method `truc' for V2::Model3dsController:Class):
app/controllers/v2/model3ds_controller.rb:8:in `<class:Model3dsController>'
app/controllers/v2/model3ds_controller.rb:4:in `<module:V2>'
app/controllers/v2/model3ds_controller.rb:3:in `<top (required)>'

即使我在基本控制器中进行了以下救援:

even if I have the following rescue in my base controller:

rescue_from ActionController::RoutingError, with: :render_routing_error

如果我的Web服务的用户向我的Web服务发送格式错误的参数，我会遇到同样的问题. 由于执行流程未通过我的代码，因此无法处理异常:

I have the same kind of problem if the user of my webservice send malformatted parameters to my webservice. Since the execution flow do not pass through my code, the exception is not handled:

Started POST "/users" for XXX.XXX.XXX.XXX at 2013-05-07 11:11:27 +0000
Error occurred while parsing request parameters.
Contents:



MultiJson::LoadError (795: unexpected token at     'url=http%3A%2F%2Ftest.test.com%2Fusers'):
json (1.7.7) lib/json/common.rb:155:in `parse'
json (1.7.7) lib/json/common.rb:155:in `parse'
multi_json (1.7.2) lib/multi_json/adapters/json_common.rb:16:in `load'
multi_json (1.7.2) lib/multi_json/adapter.rb:19:in `load'
multi_json (1.7.2) lib/multi_json.rb:120:in `load'
activesupport (3.2.13) lib/active_support/json/decoding.rb:15:in `decode'
actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:47:in `parse_formatted_parameters'
actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:17:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.13) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.13) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__3866502263790514870__call__1366634820855087578__callbacks'
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.13) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call'
railties (3.2.13) lib/rails/engine.rb:479:in `call'
railties (3.2.13) lib/rails/application.rb:223:in `call'
railties (3.2.13) lib/rails/railtie/configurable.rb:30:in `method_missing'
thin (1.5.1) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.1) lib/thin/connection.rb:79:in `catch'
thin (1.5.1) lib/thin/connection.rb:79:in `pre_process'
eventmachine (1.0.3) lib/eventmachine.rb:1037:in `call'
eventmachine (1.0.3) lib/eventmachine.rb:1037:in `block in spawn_threadpool'


Rendered /home/ubuntu/.rvm/gems/ruby-2.0.0-p0@websrv2.4.0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.8ms)
Rendered /home/ubuntu/.rvm/gems/ruby-2.0.0-p0@websrv2.4.0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.3ms)
Rendered /home/ubuntu/.rvm/gems/ruby-2.0.0-p0@websrv2.4.0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (11.7ms)

推荐答案

您想要的是exceptions_app.

Rails exceptions_app基本上是rails的配置选项，默认为ActionDispatch中的中间件PublicExceptions.

Rails exceptions_app is basically a configuration option for rails which defaults to the middleware PublicExceptions in ActionDispatch.

这几乎是exceptions_app在没有提供的情况下默认设置的:

This is pretty much what exceptions_app defaults to if none provided:

PublicExceptions

这是public_exceptions中间件，用于显示公共500.html和400.html

This is the public_exceptions middleware that handles displaying the public 500.html and 400.html

https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/middleware/public_exceptions.rb

显示例外

这是中间件的一部分，该中间件显示了开发/生产中的异常

This is part of the middleware that shows exceptions on development/production

https://github.com. com/rails/rails/blob/master/actionpack/lib/action_dispatch/middleware/show_exceptions.rb#L26

默认

这是初始化应用程序时的默认设置

Here's what it defaults to when you initialize an application

https://github.com. com/rails/rails/blob/master/railties/lib/rails/application.rb#L391-L393

您可以将其交换为应用程序，或将其路由至自己的Rails应用程序，如下所示:

You can exchange it for an app or route it to your own rails apps like this:

config/application.rb

config.exceptions_app = self.routes

然后在您的路线中匹配这样的路线

Then in your routes you would match routes like this

routes.rb

match "/500" => "errors#exception"
match "/404" => "errors#not_found"

因此，您将拥有一个ErrorsController，该控制器将具有这些操作并处理对它们的响应.

So you would then have a ErrorsController that would have these actions and handle the response to them.

errors_controller.rb

class ErrorsController < ApiController

  def exception
    render json: {error: "Internal Error"}, status: 500
  end

  def not_found
    render json: {error: "Not Found"}, status: 404
  end
end

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