run.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "server.h"
#include "logger.h"

#include "utils/signalHandling.h"

int     serverPoll(Server);
int     serverHandleAccept(Server, unsigned int);
ssize_t serverRead(Server, unsigned int);
ssize_t serverWrite(Server, unsigned int);
void    serverCloseConn(Server, unsigned int);


void
serverRun(Server this)
{
    int events = 0;

    loggerLog(this->logger, LOGGER_INFO, "service started");

    while (!doShutdown) //! until error or signal 
    {
        unsigned int i;

        if (0 <= events) {
            /*
             * TODO check why sometimes events is less than 0
             * There is still a misshandling here.
             */
            events = serverPoll(this);
        }

        /**
         * handle accept
         */
        if (0 != ((this->fds)[0].revents & POLLIN)) {
            while (0 < serverHandleAccept(this, 0)) {}
            events--;
        }

        if (events == 0) {
            continue;
        }

        /**
         * handle accept SSL
         */
        if (0 != ((this->fds)[1].revents & POLLIN)) {
            while (0 < serverHandleAccept(this, 1)) {}
            events--;
        }

        if (events == 0) {
            continue;
        }

        for (i=2; i < this->nfds; i++) {
            /**
             * handle reads 
             */
            if (0 != ((this->fds)[i].revents & POLLIN)) {
                ssize_t processed = serverRead(this, i);

                if (0 > processed) {
                    events--;

                    switch (processed) {
                        case -2: // close me...
                            serverCloseConn(this, i);

                        case -1: // poll me again
                            break;
                    }
                }

                if (0 < processed) {
                    (this->fds)[i].events |= POLLOUT;
                }
            }

            if (events == 0) {
                break;
            }

            /**
             * handle writes
             */
            if (0 != ((this->fds)[i].revents & POLLOUT)) {
                ssize_t remaining = serverWrite(this, i);

                if (0 >= remaining) {
                    /*
                     * 0 means queue was empty...try again next
                     * time...no need to poll again.
                     * Anyway, most likely we need to read again
                     * so lets finish this event for now.
                     */
                    events--;

                    switch (remaining) {
                        case  0: // nothing more to write stop polling
                            (this->fds)[i].events &= ~POLLOUT;
                            break;

                        case -2: // close me...
                            serverCloseConn(this, i);

                        case -1: // poll me again
                            break;
                    }
                }
            }

            if (events == 0) {
                break; // no more events to handle
            }
        }
    }
}

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