[GitHub] stefli commented on issue #1637: Issue about the provider side parameter validation

[GitBox <gi...@apache.org>]

stefli commented on issue #1637: Issue about the provider side parameter validation
URL: https://github.com/apache/incubator-dubbo/issues/1637#issuecomment-383489158
 
 
   @chickenlj @ralf0131 
   Latest news:
   After some tests, we found that this issue only occured when using url="dubbo://xxx" in local environment. 
   
   - **Scene (Use url property, such as url="dubbo://localhost:20880")**
   
   Invoker -> ExceptionFilter -> ValidationFilter -> Vadation Failed -> DefaultFuture
   
   The method returnFromResponse  of the class DefaultFurture will wrap the ConstraintViolationException to RemotingException when RpcResult status is not equal to OK/TIMEOUT, and return to consumer side. Then we can't convert RemotingExceptioin to ConstraitViolationException to get all the validation errors.
   1. return new RpcExeption(t.getMessage(), t) - old version
   Just wrap the ConstraintViolationException to RemotingException, unfriendly to consumer side.
   2. return new RpcResult(t) - latest version
   Throw a hession serialization issue as mentioned before, **seems the validation happened on the provider side.**
   
   Code snippet of DefaultFuture.class:
   ```
   private Object returnFromResponse() throws RemotingException {
           Response res = response;
           if (res == null) {
               throw new IllegalStateException("response cannot be null");
           }
           if (res.getStatus() == Response.OK) {
               return res.getResult();
           }
           if (res.getStatus() == Response.CLIENT_TIMEOUT || res.getStatus() == Response.SERVER_TIMEOUT) {
               throw new TimeoutException(res.getStatus() == Response.SERVER_TIMEOUT, channel, res.getErrorMessage());
           }
           throw new RemotingException(channel, res.getErrorMessage()); 
       }
   ```
   
   **Conclusion: Only the customization might fix the issue or DO NOT use this configuration when using validation.**
   
   - **Scene (without url property)**
   
   Works fine. But, it **seems the validation happened on the consumer side, not really on the provider side.**
   
   **Conclusion: Works fine, but can't solve the validation issue when debug in local environment.**
   
   Pls help confirm.

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