Updated structure and added makefile
This commit is contained in:
Mark Riddoch
274
core/gateway.c
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274
core/gateway.c
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/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*
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*/
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/*
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* Revision History
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*
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* Date Who Description
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* 23-05-2013 Massimiliano Pinto epoll loop test
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*
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*/
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#include <gw.h>
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#include <dcb.h>
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#include <session.h>
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// epoll fd, global!
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static int epollfd;
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void myfree(void** pp) { free(*pp); *pp = NULL; }
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/* basic signal handling */
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static void sighup_handler (int i) {
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fprintf(stderr, "Signal SIGHUP %i received ...\n", i);
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}
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static void sigterm_handler (int i) {
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fprintf(stderr, "Signal SIGTERM %i received ...Exiting!\n", i);
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exit(0);
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}
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/* wrapper for sigaction */
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static void signal_set (int sig, void (*handler)(int)) {
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static struct sigaction sigact;
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static int err;
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memset(&sigact, 0, sizeof(struct sigaction));
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sigact.sa_handler = handler;
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GW_NOINTR_CALL(err = sigaction(sig, &sigact, NULL));
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if (err < 0) {
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fprintf(stderr,"sigaction() error %s\n", strerror(errno));
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exit(1);
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}
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}
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int handle_event_errors(DCB *dcb, int event) {
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struct epoll_event ed;
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MySQLProtocol *protocol = DCB_PROTOCOL(dcb, MySQLProtocol);
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fprintf(stderr, "#### Handle error function for [%i] is [%s]\n", dcb->state, gw_dcb_state2string(dcb->state));
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if (dcb->state == DCB_STATE_DISCONNECTED) {
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fprintf(stderr, "#### Handle error function, session is %p\n", dcb->session);
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return 1;
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}
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#ifdef GW_EVENT_DEBUG
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if (event != -1) {
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fprintf(stderr, ">>>>>> DCB state %i, Protocol State %i: event %i, %i\n", dcb->state, protocol->state, event & EPOLLERR, event & EPOLLHUP);
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if(event & EPOLLHUP)
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fprintf(stderr, "EPOLLHUP\n");
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if(event & EPOLLERR)
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fprintf(stderr, "EPOLLERR\n");
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if(event & EPOLLPRI)
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fprintf(stderr, "EPOLLPRI\n");
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}
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#endif
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if (dcb->state != DCB_STATE_LISTENING) {
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if (epoll_ctl(epollfd, EPOLL_CTL_DEL, dcb->fd, &ed) == -1) {
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fprintf(stderr, "epoll_ctl_del: from events check failed to delete %i, [%i]:[%s]\n", dcb->fd, errno, strerror(errno));
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}
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#ifdef GW_EVENT_DEBUG
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fprintf(stderr, "closing fd [%i]=[%i], from events\n", dcb->fd, protocol->fd);
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#endif
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if (dcb->fd) {
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//fprintf(stderr, "Client protocol dcb->protocol %p\n", dcb->protocol);
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gw_mysql_close((MySQLProtocol **)&dcb->protocol);
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fprintf(stderr, "Client protocol dcb->protocol %p\n", dcb->protocol);
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dcb->state = DCB_STATE_DISCONNECTED;
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/*
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if (dcb->session->backends->protocol != NULL) {
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fprintf(stderr, "!!!!!! Backend still open! dcb %p\n", dcb->session->backends->protocol);
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gw_mysql_close((MySQLProtocol **)&dcb->session->backends->protocol);
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}
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*/
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}
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}
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fprintf(stderr, "Return from error handling, dcb is %p\n", dcb);
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//free(dcb->session);
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dcb->state = DCB_STATE_FREED;
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fprintf(stderr, "#### Handle error function RETURN for [%i] is [%s]\n", dcb->state, gw_dcb_state2string(dcb->state));
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//free(dcb);
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return 1;
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}
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int handle_event_errors_backend(DCB *dcb, int event) {
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struct epoll_event ed;
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MySQLProtocol *protocol = DCB_PROTOCOL(dcb, MySQLProtocol);
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fprintf(stderr, "#### Handle Backend error function for %i\n", dcb->fd);
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#ifdef GW_EVENT_DEBUG
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if (event != -1) {
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fprintf(stderr, ">>>>>> Backend DCB state %i, Protocol State %i: event %i, %i\n", dcb->state, dcb->proto_state, event & EPOLLERR, event & EPOLLHUP);
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if(event & EPOLLHUP)
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fprintf(stderr, "EPOLLHUP\n");
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if(event & EPOLLERR)
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fprintf(stderr, "EPOLLERR\n");
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if(event & EPOLLPRI)
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fprintf(stderr, "EPOLLPRI\n");
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}
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#endif
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if (dcb->state != DCB_STATE_LISTENING) {
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if (epoll_ctl(epollfd, EPOLL_CTL_DEL, dcb->fd, &ed) == -1) {
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fprintf(stderr, "Backend epoll_ctl_del: from events check failed to delete %i, [%i]:[%s]\n", dcb->fd, errno, strerror(errno));
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}
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#ifdef GW_EVENT_DEBUG
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fprintf(stderr, "Backend closing fd [%i]=%i, from events check\n", dcb->fd, protocol->fd);
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#endif
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if (dcb->fd) {
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dcb->state = DCB_STATE_DISCONNECTED;
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fprintf(stderr, "Freeing backend MySQL conn %p, %p\n", dcb->protocol, &dcb->protocol);
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gw_mysql_close((MySQLProtocol **)&dcb->protocol);
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fprintf(stderr, "Freeing backend MySQL conn %p, %p\n", dcb->protocol, &dcb->protocol);
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}
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}
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}
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// main function
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int main(int argc, char **argv) {
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int daemon_mode = 1;
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sigset_t sigset;
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struct epoll_event events[MAX_EVENTS];
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struct epoll_event ev;
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int nfds;
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int n;
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fprintf(stderr, "(C) SkySQL Ab 2013\n");
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if (sigfillset(&sigset) != 0) {
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fprintf(stderr, "sigfillset() error %s\n", strerror(errno));
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return 1;
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}
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if (sigdelset(&sigset, SIGHUP) != 0) {
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fprintf(stderr, "sigdelset(SIGHUP) error %s\n", strerror(errno));
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}
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if (sigdelset(&sigset, SIGTERM) != 0) {
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fprintf(stderr, "sigdelset(SIGTERM) error %s\n", strerror(errno));
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}
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if (sigprocmask(SIG_SETMASK, &sigset, NULL) != 0) {
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fprintf(stderr, "sigprocmask() error %s\n", strerror(errno));
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}
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signal_set(SIGHUP, sighup_handler);
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signal_set(SIGTERM, sigterm_handler);
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if (daemon_mode == 1) {
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gw_daemonize();
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}
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fprintf(stderr, "GATEWAY is starting, PID %i\n\n", getpid());
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fprintf(stderr, ">> GATEWAY log is /dev/stderr\n");
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epollfd = epoll_create(MAX_EVENTS);
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if (epollfd == -1) {
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perror("epoll_create");
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, ">> GATEWAY epoll maxevents is %i\n", MAX_EVENTS);
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// listen to MySQL protocol
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/*
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1. create socket
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2. set reuse
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3. set nonblock
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4. listen
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5. bind
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6. epoll add event
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*/
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MySQLListener(epollfd, NULL);
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// event loop for all the descriptors added via epoll_ctl
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while (1) {
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nfds = epoll_wait(epollfd, events, MAX_EVENTS, -1);
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//nfds = epoll_wait(epollfd, events, MAX_EVENTS, 1000);
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if (nfds == -1 && (errno != EINTR)) {
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perror("GW: epoll_pwait ERROR");
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exit(EXIT_FAILURE);
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}
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//#ifdef GW_EVENT_DEBUG
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fprintf(stderr, "wake from epoll_wait, n. %i events\n", nfds);
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//#endif
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for (n = 0; n < nfds; ++n) {
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DCB *dcb = (DCB *) (events[n].data.ptr);
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//#ifdef GW_EVENT_DEBUG
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fprintf(stderr, "New event %i for socket %i is %i\n", n, dcb->fd, events[n].events);
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if (events[n].events & EPOLLIN)
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fprintf(stderr, "New event %i for socket %i is EPOLLIN\n", n, dcb->fd);
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if (events[n].events & EPOLLOUT)
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fprintf(stderr, "New event %i for socket %i is EPOLLOUT\n", n, dcb->fd);
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if (events[n].events & EPOLLPRI)
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fprintf(stderr, "New event %i for socket %i is EPOLLPRI\n", n, dcb->fd);
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//#endif
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if (events[n].events & EPOLLIN) {
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// now checking the listening socket
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if (dcb->state == DCB_STATE_LISTENING) {
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(dcb->func).accept(dcb, epollfd);
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} else {
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fprintf(stderr, "CALL the READ pointer\n");
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(dcb->func).read(dcb, epollfd);
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}
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}
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if (events[n].events & EPOLLOUT) {
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if (dcb->state != DCB_STATE_LISTENING) {
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fprintf(stderr, "CALL the WRITE pointer\n");
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(dcb->func).write(dcb, epollfd);
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fprintf(stderr, ">>> CALLED the WRITE pointer\n");
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}
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}
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if (events[n].events & (EPOLLERR | EPOLLHUP)) {
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fprintf(stderr, "CALL the ERROR pointer\n");
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(dcb->func).error(dcb, events[n].events);
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}
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} // filedesc loop
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} // infinite loop
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// End of while (1)
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} // End of main
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