如何使用Ruby Rest-Client处理异常

Question

我最近从Ruby的Net:HTTP类切换到rest-client 1.6.7.

我发现形成请求要容易得多,但与Net:HTTP请求不同,当rest-client获得200以外的任何东西时,请求就会消失.我已经尝试在RestClient.get之后直接放置一个断点,它永远不会被击中 - 所以我做错了.

def get_member_using_card
  resource = "#{@settings_app_uri}api/v1/card/#{self.member_card_num}?token=#{@settings.api_key}"
  response = RestClient.get resource
  if response.code == 200 
    card = JSON.parse(response.body)
    self.customer_id = card['card']['customer_id']
  else
    return 0
  end
end

这导致了这个堆栈跟踪:

RestClient::ResourceNotFound - 404 Resource Not Found:
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/abstr
act_response.rb:48:in `return!'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/reque
st.rb:230:in `process_result'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/reque
st.rb:178:in `block in transmit'
        /Users/tim/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/net/http.rb:627:in `start'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/reque
st.rb:172:in `transmit'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/reque
st.rb:64:in `execute'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient/reque
st.rb:33:in `execute'
        /Users/tim/.rvm/gems/ruby-1.9.2-p290/gems/rest-client-1.6.7/lib/restclient.rb:68
:in `get'

有人能告诉我如何正确评估响应代码并防止这种异常发生......？

Answer 1

看标题异常的http://rubydoc.info/gems/rest-client/

• 对于200到207之间的结果代码,将返回RestClient :: Response
• 对于结果代码301,302或307,如果请求是get或head,则将遵循重定向
• 对于结果代码303,将遵循重定向并将请求转换为get
• 对于其他情况,将引发保存Response的RestClient :: Exception,将为已知的错误代码抛出特定的异常类

RestClient.get 'http://example.com/resource'
? RestClient::ResourceNotFound: RestClient::ResourceNotFound`

begin
  RestClient.get 'http://example.com/resource'
rescue => e
  e.response
end
? 404 Resource Not Found | text/html 282 bytes

Answer 2

同样在@wich指向的文档中,您可以将一个块传递给RestClient.get,这样它就不会在非200响应代码上引发异常:

# Don't raise exceptions but return the response
RestClient.get('http://example.com/resource'){|response, request, result| response }

请参阅"结果处理"部分:http://www.rubydoc.info/gems/rest-client/1.6.7/frames#Result_handling

Answer 3

rescue RestClient::ExceptionWithResponse => err