Server side exception Poco::Util::AbstractionConfiguration

[ma740988]

Consider client side source snippet:

Code: Select all

std::string xml =
  "<test>"
     "<abc id="\xxx\" num=\"1\">"
     "  <stuff>30</stuff>"
     "</abc>
"</test>;

int main ( int arg, char* argv[] ){
  try {
   //this is just to check if xml is well formed.. apparently the abstraction class will throw exception if it objects
   //start
    std::istringstream iss ( xml ) ;
    Poco::Util::AbstractionConfiguration  *ptr = new  ( std::nothrow ) Poco::Util::AbstractionConfiguration ( iss ) ;
    if ( !ptr )  return EXIT_FAILURE ;
   //end

   Poco::HTTPRequest request( "POST", "/event");
   request.setContentType ( "text/xml");
   //request.setContentType ( "text/xml; char=\"utf-8\"" );  //makes no difference it seems
   request.setContentLength( xml.length() );
   Poco::HTTPClientSession s( "127.0.0.1", 8801 ) ;
   s.sendRequest(request) << xml;

  //check response

  } catch ( Poco::Exception& exec ) {

  }
  return EXIT_SUCCESS ;
}




Server side snippet

Code: Select all

  std::istream& istr = req.stream ;  //where req is Poco::Net::HTTPServerRequest& req
  std::stringstream oss;
  oss << istr.rdbuf();
  std::string request = oss.str();
 
  std::istringstream iss ( xml ) ;
  Poco::Util::AbstractionConfiguration  *ptr = new  ( std::nothrow ) Poco::Util::AbstractionConfiguration ( iss ) ;
  if ( !ptr )  return ;



Invocation of new AbstractionConfiguration invokes an exception on server side. This tells me that something is amiss about the client side transfer. I know the XML is 'loosely speaking' well formed because if it wasn't I would not be able to create an Abstraction object on the client side.

Clearly, i receive the contents on the server side since I'm able to do std::cout << request<< std::endl; What's unclear to me though is why the abstraction class rejects the XML. Ideas? Thanks

[WittrockJ]

Are you sure the xml is well formed? Looks like your xml string has some quoting problems.

Code: Select all

std::string xml =
  "<test>"
     "<abc id="\xxx\" num=\"1\">"
     "  <stuff>30</stuff>"
     "</abc>
"</test>;


Shouldn't this be something like:

Code: Select all

std::string xml =
  "<test>"
     "<abc id=\"xxx\" num=\"1\">"
     "  <stuff>30</stuff>"
     "</abc>"
"</test>";


[ma740988]

You're correct. I had a typo when I typed my message. It (XML) is well-formed in the code. I have a check on the client side "see source' snippet, so if it wasn't I'd get an exception.

[rmoffer]

Shouldn't you be reading oss not iss ?


We have a lot of code patters that do

Code: Select all


    std::stringstream requestBody;

    // copy the request to local storage
    //
    Poco::StreamCopier::copyStream( req.stream(), requestBody );
   
    // build a config object out of it
    Poco::SharedPtr<XMLConfiguration> cfg = new XMLConfiguration();

     cfg->load( requestBody );



Although note that the XMLConfiguration is our local subclass of the standard Poco::Util::XMLConfiguration - something to do with public vs private data members...

[alex]

Clearly, i receive the contents on the server side since I'm able to do std::cout << request<< std::endl; What's unclear to me though is why the abstraction class rejects the XML. Ideas? Thanks

First of all, I suggest you do your homework before posting. Posting code that not only doesn't compile, but is using nonexistent classes is rude.

Aside from your xml snippet being broken, what is Poco::Util::AbstractionConfiguration? There is no such class in Poco::Util. If you meant Poco::Util::AbstractConfiguration, that class is (as it's name implies) abstract, which means it can not be instantiated.

Community will be glad to help you, but you have to do your part. Please do your homework before posting and sending people on a wild goose chase.