如何使用 Ruby Rest-Client 处理异常
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How to handle exceptions with Ruby Rest-Client
提问by tpow
I recently switched from Ruby's Net:HTTP class to rest-client 1.6.7.
我最近从 Ruby 的 Net:HTTP 类切换到了 rest-client 1.6.7。
I find it a lot easier to form requests, but unlike Net:HTTP request, when rest-client gets anything other than a 200, the request dies. I've tried putting a breakpoint directly after the RestClient.get, and it never gets hit - so I'm doing something wrong.
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 以外的任何内容时，请求就会终止。我试过在 RestClient.get 之后直接放置一个断点，但它永远不会被击中 - 所以我做错了什么。
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
Which results in this stacktrace:
这导致此堆栈跟踪：
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'
Can someone tell me how to properly evaluate the response code and keep this exception from happening...?
有人可以告诉我如何正确评估响应代码并防止发生此异常......？
回答by wich
See heading Exceptionson http://rubydoc.info/gems/rest-client/
看标题异常的http://rubydoc.info/gems/rest-client/
- for results code between 200 and 207 a RestClient::Response will be returned
- for results code 301, 302 or 307 the redirection will be followed if the request is a get or a head
- for result code 303 the redirection will be followed and the request transformed into a get
- for other cases a RestClient::Exception holding the Response will be raised, a specific exception class will be thrown for know error codes
- 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，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 RestClient::Exception 持有响应，将抛出特定异常类以获取已知错误代码
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
回答by Raphael
Also in the same documentation @wich pointed to, you can pass a block to RestClient.get such that it will not throw an exception on non-200 response codes:
同样在@wich 指向的同一文档中，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 }
See the "Result Handling" section from the documentation.
请参阅文档中的“结果处理”部分。
回答by Serhiy Nazarov
rescue RestClient::ExceptionWithResponse => err
回答by MegaTux
There are several errors that could happen, specific exception types like Errno::EHOSTUNREACHor the more generic ExceptionWithResponse. Check the readmefor more info.
可能会发生多种错误，特定的异常类型，如Errno::EHOSTUNREACH或更通用的 ExceptionWithResponse。查看自述文件以获取更多信息。
