Hi !

I'm kind of new to this mailing list, I hope I did post this message correctly and in the right place.

I'm facing a strange issue with libcurl and I do not understand if this is a "standard" behavior: I'm using libcurl to send multiple file to a web server on an embedded system. This web server can unfortunately not handle multipart requests. So I have to send each files one after the other. The files are pretty light (~10k). The problem is that for each transfer, libcurls falls one or two times in a select() timeout of 1000[ms]. Each files takes 2 seconds to transfer... which is too much ofr our client.

On libcurl side, the select timeout is in select.c, in Curl_socket_ready() function when the windows api select() function is called. Since we are supporting windows XP on the client side, we can not use the macro HAVE_POLL_FINE.

On our side, The code we use to send a file is the following (the cleanup of the CURL handle is done in the destructor. The object "CurlWrapper" is recreated for each transfer) :

int CurlWrapper::PushFile(
        const YString& _sourcePath,
        const YString& _URL,
        const YString& _targetFileName,
        bool* bCancelFlag)
{
        m_formpost = NULL;
        m_lastptr = NULL;
        m_headerlist = NULL;

        /* Fill in the file upload field */
        curl_formadd(
                &m_formpost,
                &m_lastptr,
                CURLFORM_COPYNAME, "sendfile",
                CURLFORM_FILE, _sourcePath.c_str(),
                CURLFORM_END );

        /* Fill in the filename field */
        curl_formadd(
                &m_formpost,
                &m_lastptr,
                CURLFORM_COPYNAME, "filename",
                CURLFORM_COPYCONTENTS, _targetFileName.c_str(),
                CURLFORM_END );

        /* Fill in the submit field too, even if this is rarely needed */
        curl_formadd(
                &m_formpost,
                &m_lastptr,
                CURLFORM_COPYNAME, "submit",
                CURLFORM_COPYCONTENTS, "send",
                CURLFORM_END );

        CURLcode res = CURLE_INTERFACE_FAILED;

        if ( m_curl_handle )
        {
                LOG_KMS_INFO( "CURL Handle successfully created" );

                //Todo construct URL

                curl_easy_setopt( m_curl_handle, CURLOPT_URL, _URL.c_str() );
                curl_easy_setopt( m_curl_handle, CURLOPT_PORT, m_port );
                curl_easy_setopt( m_curl_handle, CURLOPT_WRITEFUNCTION, &LOGWriter );
                curl_easy_setopt( m_curl_handle, CURLOPT_HTTPPOST, m_formpost );
                curl_easy_setopt( m_curl_handle, CURLOPT_PROGRESSDATA, bCancelFlag );

                LOG_KMS_INFO( "Sending HTTP request" );

                res = curl_easy_perform( m_curl_handle );

                if ( res != 0 )
                        LOG_KMS_INFO( "HTTP request returned error %d.", res );
                else
                        LOG_KMS_INFO( "Upload complete!" );

                /* cleanup */
                curl_formfree( m_formpost );
        // curl_slist_free_all( headerlist );
        }
        else
        {
                LOG_KMS_INFO( "CURL Handle not created (Init error?)" );
        }
        return TranslateCurlError(res);
}

Has anyone already faced this issue ? Am I doing something completely wrong in my code ?

Thanks in advance for the help,

Daniel Peppicelli
Software engineer
Switzerland

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Received on 2011-05-30