Re: [Cppcms-users] comet question

[Frank E. <fra...@an...>]

hi,

i added the finalize calls.

- i use cppcms from svn (revision 1314)
- it happens when i try to access the url for postMessage or
consumeMessage using chrome (or i guess any other browser)

the application runs in scgi mode behind nginx. could this be the problem?

frank.

Am 13.07.2010 15:59, schrieb Artyom:
> Hi,
> 
> I've tested your code and it mostly works.
> 
> Also I don't see any "Access to unassigned context" errors
> 
> The only problem is that you need to add "response().finalize();" before calling
> async_complete_response() in case you do not write anything to output (i.e. not 
> accessed to out())
> 
> I've updated the blog post. 
> 
> About unassigned context 
> 
> - what version of CppCMS are you using.
> - In what case it happens (which URL is accessed and in what method)?
> 
> This exception is thrown in case you try to use any request/response related 
> information
> after calling release_context(), do you call any functions after 
> release_context()
> In what location the exception is thrown?
> 
> Artyom
> 
> See where to add finalize() in the code below.
> 
> 
>>
>> i try to build the example from the  blogpost
>>
>> http://art-blog.no-ip.info/cppcms/blog/post/47
>>
>> and i'm  kind of stuck. the example seems not to be really compatible
>> with the current  cppcms version. i adapted the source as follows:
>>
>> class lpTest : public  cppcms::application {
>> public:
>>   lpTest(cppcms::service &srv)  :
>>     cppcms::application(srv) {
>>
>>      dispatcher().assign("^/postMessage$",
>>                          &lpTest::postMessage,  this);
>>      dispatcher().assign("^/consumeMessage/(\\d+)$",
>>                           &lpTest::consumeMessage, this, 1);
>>   }
>>
>>   void  postMessage() {
>>     if(request().request_method() == "POST")  {
>>       if(request().post().find("message") !=  request().post().end()) {
>>          messages.push_back(request().post().find("message")->second);
>>          broadcast();
>>       }
>>      }
>>
> 
> NEED response().finalize() THERE
> 
>>      release_context()->async_complete_response();
>>   }
>>
>>   void  consumeMessage(std::string id) {
>>     unsigned pos =  atoi(id.c_str());
>>
>>     if(pos < messages.size()) {
>>        response().set_plain_text_header();
>>        response().out() << messages[pos];
>>        release_context()->async_complete_response();
>>     } else if(pos  == messages.size()) {
>>        waiters.push_back(release_context());
>>     } else {
>>        response().status(404);
> 
> NEED response().finalize() THERE
> 
>>        release_context()->async_complete_response();
>>     }
>>    }
>>
>>   void broadcast() {
>>     // send the message to all  waiters
>>     for(unsigned i=0; i<waiters.size(); i++) {
>>        waiters[i]->response().set_plain_text_header();
>>        waiters[i]->response().out() <<  messages.back();
>>        waiters[i]->async_complete_response();
>>     }
>>
>>      waiters.clear();
>>   }
>>
>> private:
>>    std::vector<std::string> messages;
>>    std::vector<booster::shared_ptr<cppcms::http::context> >  waiters;
>> };
>>
>> and for main:
>>
>>   cppcms::service srv(argc,  argv);
>>   booster::intrusive_ptr<lpTest> app = new  lpTest(srv);
>>   srv.applications_pool().mount(app);
>>    srv.run();
>>
>> as far as i understand this should work. my problem is that if  i start
>> the application and do a request it gives me the following  exception:
>>
>> Catched excepion [Access to unassigned context]  (.../http_context.cpp:144)
>>
>> it seems like the framework tries to do  something with the context
>> though it has been released by release_context() -  what am i  missing?
>>
>> frank
>>
>>
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> 
> 
>       
> 
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