[FASTCGI] help needed...

Majed Al-Dolaimi majed.aldolaimi at gmail.com
Mon Mar 14 17:14:44 EDT 2011


I will have to digg into fastcgi specifications as well as qt source code.
The aim is to have an event driven response rather than a sleeping blocking
loop. The research has just begun.
Cheers.
Dolaimi.
On Mar 15, 2011 12:01 AM, "Tom Bowden" <charles_thomas at mac.com> wrote:
> Are Qt sockets built on top of their (trolltech's) own version of the
> stream interface?... Something like QStream?
>
> If so it would be cool to have a fastcgi --> qt streams interface --
> and might be a simple thing (like with _cin_streambuf = cin.rdbuf
> () calls ... ) where you just need to assign the underlying storage
> class (of the stream object).
>
> ??
>
> Tom
>
> On Mar 13, 2011, at 5:54 PM, Majed Al-Dolaimi wrote:
>
>> Thanks tom and david. Sorry for the delayed reply, i was travelling.
>> I have fastcgi working now through printf and scanf. I know they
>> are old school, but it is ok untill i use sockets directly.
>> I will try to write Qt socket classes to wrap fastcgi sockets, but
>> it's far from simple. Qt reads environment variables for me in a
>> simple way. This is promising.
>> Since i have decided to program web apps from now on, i think i
>> coverted to fastcgi. Thanks to Tom.
>> Regards.
>> Dolaimi.
>>
>> On Mar 13, 2011 1:39 PM, "Tom Bowden" <charles_thomas at mac.com> wrote:
>> > Of course -- I am operating under the assumption that the way I am
>> > using FastCGI is right; and that my understanding of its
>> architecture
>> > is correct... neither of which may be true statements - but at least
>> > it works for me :)
>> >
>> >
>> > Tom
>> >
>> >
>> > On Mar 11, 2011, at 8:12 PM, Tom Bowden wrote:
>> >
>> >> Speaking as a recent convert (of about a year or so) I would
>> >> certainly hope that you don't lose hope with FastCgi.
>> >>
>> >> At first blush -- it isn't stdout that you're supposed to write
>> to...
>> >>
>> >> Some tips/pointers that I have gleaned from this newsgroup and the
>> >> examples in the code -- along with how I use fastcgi:
>> >>
>> >> I have applications that must select on sockets from postgres,
>> >> inotifyd, and fastcgi -- so I can't use fcgi_* . So I use the
>> >> thread-safe version of FCGX functions.
>> >> I also have to play around a lot with headers -- to pass cookies,
>> >> custom status codes, etc. So I create a number of ostringstream
>> >> objects, write to them - and then dump them out as I need to with
>> >> FCGX_PutStr().
>> >>
>> >> What helped me the most -- with the paradigm of fastcgi -- is that
>> >> I'm not really receiving from stdin and stdout (anonymous pipes
>> >> associated with program). Instead I am talking with sockets that
>> >> are hidden by the API.
>> >> Here's some snippets.. FWIW. If more complete examples are needed
>> >> I can post them.,... but perhaps this is enough.
>> >>
>> >>
>> >>
>> >> In my startup of an object that communicates:
>> >> void IDOTicket::startup()
>> >> {
>> >> FCGX_Init();
>> >> FCGX_InitRequest(&_request, 0, 0);
>> >> fcntl(FCGI_LISTENSOCK_FILENO, F_SETFL, O_NONBLOCK);
>> >> _cin_streambuf = cin.rdbuf();
>> >> _cout_streambuf = cout.rdbuf();
>> >> _cerr_streambuf = cerr.rdbuf();
>> >>
>> >> }
>> >>
>> >> When I receive notification that there is a request to process:
>> >>
>> >> int IDOTicket::process_fastcgi_environment(Json::Value& pc)
>> >> {
>> >> int fcgx_method = FCGX_UNDEFINED;
>> >> if (FCGX_Accept_r(&_request) != 0) {
>> >> .. do stuff here ..
>> >> }
>> >>
>> >>
>> >>
>> >>
>> >> When I read from the socket:
>> >>
>> >> long IDOTicket::read_xml_request(std::string& content_string)
>> >> {
>> >> char * clenstr = FCGX_GetParam("CONTENT_LENGTH",
>> >> _request.envp);
>> >> unsigned long clen = STDIN_MAX;
>> >> if (clenstr) {
>> >> clen = strtol(clenstr, &clenstr, 10);
>> >> if (*clenstr) {
>> >> clen = STDIN_MAX;
>> >> }
>> >>
>> >> // *always* put a cap on the amount of data that will be
>> >> read
>> >> if (clen > STDIN_MAX) {
>> >> clen = STDIN_MAX;
>> >> }
>> >>
>> >> content_string.resize( clen );
>> >> std::string input_str;
>> >> FCGX_GetStr((char*)content_string.data(), clen,
>> >> _request.in);
>> >> _ticket_interface_object->input(xmlParseMemory
>> >> ( content_string.c_str(), content_string.size()));
>> >>
>> >> } else {
>> >> // *never* read stdin when CONTENT_LENGTH is missing or
>> >> unparsable
>> >> content_string.empty();
>> >> clen = 0;
>> >> }
>> >>
>> >> // Chew up any remaining stdin - this shouldn't be necessary
>> >> // but is because mod_fastcgi doesn't handle it correctly.
>> >> // ignore() doesn't set the eof bit in some versions of
>> >> glibc++
>> >> // so use gcount() instead of eof()...
>> >> do {
>> >> cin.ignore(1024);
>> >> } while (cin.gcount() == 1024);
>> >>
>> >> if ( content_string.empty() ) {
>> >> return 0L;
>> >> } else {
>> >> return content_string.size();
>> >> }
>> >> }
>> >>
>> >> WHEN I READ An environmental variable passed from apache, created
>> >> by the fastcgi manager, and then consumed in my app:
>> >>
>> >> char* const* envp = _request.envp;
>> >>
>> >> for ( envp = _request.envp; *envp; ++envp) {
>> >> Json::Value p_context = Json::Value(objectValue);
>> >> std::string name;
>> >> std::string value;
>> >> if ( IDOPattern( PCRE_POST_REQUEST_METHOD)->PartialMatch
>> >> ( (*envp),&name, &value ) ) {
>> >> fcgx_method = FCGX_POST;
>> >> } else if ( IDOPattern( PCRE_GET_REQUEST_METHOD)-
>> >> >PartialMatch( (*envp),&name, &value ) ) {
>> >> fcgx_method = FCGX_GET;
>> >> } else if ( IDOPattern( PCRE_QUERY_STRING)->PartialMatch
>> >> ( (*envp), &name, &value) ) {
>> >> std::string param_name;
>> >> std::string param_value;
>> >> std::string param_post;
>> >> while ( IDOPattern( PCRE_SERIALIZED_FORM)->PartialMatch
>> >> ( value.c_str(), &param_name, &param_value, &param_post) ) {
>> >> p_context[HAS_NAME_OF] = param_name;
>> >> p_context[HAS_TYPE_OF] = param_name;
>> >> p_context[HAS_VALUE_OF] = param_value;
>> >> pc.append(p_context);
>> >> value = param_post;
>> >> }
>> >> }
>> >> }
>> >>
>> >>
>> >>
>> >> WHEN I am writing to the socket:
>> >>
>> >> if ( data_stream.str().size() < 1 ) {
>> >> http_stream << "Content-Length: " << content_stream.str
>> >> ().size() << std::endl;
>> >> } else {
>> >> content_stream << data_stream.str() << std::endl;
>> >> http_stream << "Content-Length: " << content_stream.str
>> >> ().size() << std::endl;
>> >> }
>> >> header_stream << std::endl;
>> >>
>> >> if ( http_stream.str().size() > 0) {
>> >> FCGX_PutStr(http_stream.str().c_str(), http_stream.str
>> >> ().size(), _request.out);
>> >> }
>> >> if ( header_stream.str().size() > 0) {
>> >> FCGX_PutStr(header_stream.str().c_str(),
>> >> header_stream.str().size(), _request.out);
>> >> }
>> >> if ( content_stream.str().size() > 0) {
>> >> FCGX_PutStr(content_stream.str().c_str(),
>> >> content_stream.str().size(), _request.out);
>> >> }
>> >> }
>> >>
>> >>
>> >> When I am finished with the socket/call of a single request:
>> >>
>> >> FCGX_Finish_r(&_request);
>> >>
>> >>
>> >>
>> >> AS FOR LINKING:
>> >>
>> >> Snippets from my Makefile
>> >>
>> >> INCS += -I/usr/include/fastcgi
>> >>
>> >> LIBS +=-lxslt
>> >> LIBS +=-lfcgi++
>> >> LIBS += $(PCRE_LIB_OPS) -lpcrecpp $(CURL_LIB_OPS) $
>> >> (READLINE_LIB_OPS) \
>> >> -L/usr/lib -lpthread -lm -ldl -lxml2 -lz
>> >>
>> >>
>> >> On Mar 11, 2011, at 7:35 AM, Majed Al-Dolaimi wrote:
>> >>
>> >>> Hi guys,
>> >>> I am a bit disappointed in the FastCGI documentation, as many
>> >>> other people are. However I am not losing hope with it.
>> >>>
>> >>> 1 - I installed the apache mod_fcgid from SUSE website and it
>> >>> seems to be working..
>> >>> 2 - I configured, compiled the fcgi-(*-*).tar.gz and added the
>> >>> libs to the /usr/lib.
>> >>> 3 - Added the -Ifcgi++ (or -Ifcgi ) library to my Makefile... my
>> >>> compiler is not complaining
>> >>> 4 - Added the FCGI_Accept() loop to my main routing in my c++
>> app...
>> >>>
>> >>> RESULTS: When I run the whole thing ...
>> >>> 5 - my app runs (it shows on the process monitor as a sleeping
>> >>> process) and does not stop immediately which fine and dandy
>> >>> 6 - I only get a blank page in the browser. Even an error message
>> >>> from my WWW server does not show up.
>> >>> I tried flushing the std::cout as well as writing to stdout file
>> >>> descrptier then flush it... nothing shows up on the browser
>> screen..
>> >>>
>> >>> What I could not understand is making sure the linker searches
>> >>> for the BSD socket library. Since the ldconfig did not complain, I
>> >>> assumed it found it, right?
>> >>>
>> >>> Your help will pay back to fastcgi... so please help me out..
>> >>>
>> >>> Majed Dolaimi
>> >>> C++/ web developer
>> >>> _______________________________________________
>> >>> FastCGI-developers mailing list
>> >>> FastCGI-developers at mailman.fastcgi.com
>> >>> http://mailman.pins.net/mailman/listinfo.cgi/fastcgi-developers
>> >>
>> >
>
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