/* * This file is distributed as part of the SkySQL Gateway. It 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, * version 2. * * 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, write to the Free Software Foundation, Inc., 51 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * Copyright SkySQL Ab 2013 * */ /** * @file gateway.c - The gateway entry point. * * @verbatim * Revision History * * Date Who Description * 23-05-2013 Massimiliano Pinto epoll loop test * 12-06-2013 Mark Riddoch Add the -p option to set the * listening port * and bind addr is 0.0.0.0 * 19/06/13 Mark Riddoch Extract the epoll functionality * 21/06/13 Mark Riddoch Added initial config support * 27/06/13 * 28/06/13 Vilho Raatikka Added necessary headers, example functions and * calls to log manager and to query classifier. * Put example code behind SS_DEBUG macros. * * @endverbatim */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include # include # include /* * Server options are passed to the mysql_server_init. Each gateway must have a unique * data directory that is passed to the mysql_server_init, therefore the data directory * is not fixed here and will be updated elsewhere. */ static char* server_options[] = { "SkySQL Gateway", "--datadir=", "--skip-innodb", "--default-storage-engine=myisam", NULL }; const int num_elements = (sizeof(server_options) / sizeof(char *)) - 1; static char* server_groups[] = { "embedded", "server", "server", "server", NULL }; /* The data directory we created for this gateway instance */ static char datadir[1024] = ""; /** * exit flag for log flusher. */ static bool do_exit = FALSE; /** * Flag to indicate whether libmysqld is successfully initialized. */ static bool libmysqld_started = FALSE; static void log_flush_shutdown(void); static void log_flush_cb(void* arg); static void libmysqld_done(void); /** * Handler for SIGHUP signal. Reload the configuration for the * gateway. */ static void sighup_handler (int i) { skygw_log_write( LOGFILE_MESSAGE, "Refreshing configuration following SIGHUP\n"); config_reload(); } static void sigterm_handler (int i) { extern void shutdown_gateway(); skygw_log_write_flush( LOGFILE_ERROR, "Error : Signal SIGTERM %i received ...Exiting!", i); shutdown_gateway(); } static void sigint_handler (int i) { extern void shutdown_gateway(); skygw_log_write_flush( LOGFILE_ERROR, "Error : Signal SIGINT %i received ...Exiting!", i); shutdown_gateway(); fprintf(stderr, "Shuting down MaxScale\n"); } /* wrapper for sigaction */ static void signal_set (int sig, void (*handler)(int)) { static struct sigaction sigact; static int err; memset(&sigact, 0, sizeof(struct sigaction)); sigact.sa_handler = handler; GW_NOINTR_CALL(err = sigaction(sig, &sigact, NULL)); if (err < 0) { skygw_log_write_flush( LOGFILE_ERROR, "Error : sigaction() error %s.", strerror(errno)); exit(1); } } /** * Cleanup the temporary data directory we created for the gateway */ void datadir_cleanup() { char buf[1024]; if (datadir[0] && access(datadir, F_OK) == 0) { sprintf(buf, "rm -rf %s", datadir); system(buf); } } static void libmysqld_done(void) { if (libmysqld_started) { mysql_library_end(); } } #if 0 static char* set_home_and_variables( int argc, char** argv) { int i; int n; char* home = NULL; bool home_set = FALSE; for (i=1; i 0 && access(&argv[n][j], R_OK) == 0) { home = strdup(&argv[n][j]); goto return_home; } } } if ((home = getenv("MAXSCALE_HOME")) != NULL) { sprintf(mysql_home, "%s/mysql", home); setenv("MYSQL_HOME", mysql_home, 1); } return_home: return home; } #endif /** * The main entry point into the gateway * * @param argc The argument count * @param argv The arguments themselves */ int main(int argc, char **argv) { int daemon_mode = 1; sigset_t sigset; int i, n, n_threads, n_services; void **threads; char mysql_home[1024], buf[1024], *home, *cnf_file = NULL; char ddopt[1024]; void* log_flush_thr = NULL; ssize_t log_flush_timeout_ms = 0; int l; #if defined(SS_DEBUG) memset(conn_open, 0, sizeof(bool)*1024); memset(dcb_fake_write_errno, 0, sizeof(unsigned char)*1024); memset(dcb_fake_write_ev, 0, sizeof(__int32_t)*1024); fail_next_backend_fd = false; fail_next_client_fd = false; fail_next_accept = 0; fail_accept_errno = 0; #endif l = atexit(skygw_logmanager_exit); if (l != 0) { fprintf(stderr, "Couldn't register exit function.\n"); } atexit(datadir_cleanup); for (n = 0; n < argc; n++) { if (strcmp(argv[n], "-d") == 0) { /** Debug mode, maxscale runs in this same process */ daemon_mode = 0; } /** * 1. Resolve config file location from command-line argument. */ if (strncmp(argv[n], "-c", 2) == 0) { int s=2; while (argv[n][s] == 0 && s<10) s++; if (s==10) { skygw_log_write_flush( LOGFILE_ERROR, "Fatal : Unable to find a MaxScale " "configuration file, either install one in " "/etc/MaxScale.cnf, " "$MAXSCALE_HOME/etc/MaxScale.cnf " "or use the -c option. Exiting."); } cnf_file = &argv[n][s]; } } /** * Maxscale must be daemonized before opening files, initializing * embedded MariaDB and in general, as early as possible. */ if (daemon_mode == 1) { if (sigfillset(&sigset) != 0) { skygw_log_write_flush( LOGFILE_ERROR, "Error : sigfillset() error %s", strerror(errno)); return 1; } if (sigdelset(&sigset, SIGHUP) != 0) { skygw_log_write_flush( LOGFILE_ERROR, "Error : sigdelset(SIGHUP) error %s", strerror(errno)); } if (sigdelset(&sigset, SIGTERM) != 0) { skygw_log_write_flush( LOGFILE_ERROR, "Error : sigdelset(SIGTERM) error %s", strerror(errno)); } if (sigprocmask(SIG_SETMASK, &sigset, NULL) != 0) { skygw_log_write_flush( LOGFILE_ERROR, "Error : sigprocmask() error %s", strerror(errno)); } gw_daemonize(); } signal_set(SIGHUP, sighup_handler); signal_set(SIGTERM, sigterm_handler); signal_set(SIGINT, sigint_handler); l = atexit(libmysqld_done); if (l != 0) { fprintf(stderr, "Couldn't register exit function.\n"); skygw_log_write_flush( LOGFILE_ERROR, "Error : Couldn't register exit function."); } if ((home = getenv("MAXSCALE_HOME")) != NULL) { if (access(home, R_OK) != 0) { fprintf(stderr, "The configured value of MAXSCALE_HOME '%s' does not " "exist.\n", home); skygw_log_write_flush( LOGFILE_ERROR, "Fatal : The configured value of MAXSCALE_HOME '%s' does " "not exist.", home); exit(1); } sprintf(mysql_home, "%s/mysql", home); setenv("MYSQL_HOME", mysql_home, 1); /** * 2. Resolve config file location from $MAXSCALE_HOME/etc. */ if (cnf_file == NULL) { sprintf(buf, "%s/etc/MaxScale.cnf", home); if (access(buf, R_OK) == 0) { cnf_file = buf; } } } /** * If not done yet, * 3. Resolve config file location from /etc/MaxScale. */ if (cnf_file == NULL && access("/etc/MaxScale.cnf", R_OK) == 0) cnf_file = "/etc/MaxScale.cnf"; /* * Set a data directory for the mysqld library, we use * a unique directory name to avoid clauses if multiple * instances of the gateway are beign run on the same * machine. */ if (home) { sprintf(datadir, "%s/data%d", home, getpid()); mkdir(datadir, 0777); } else { sprintf(datadir, "/tmp/MaxScale/data%d", getpid()); mkdir("/tmp/MaxScale", 0777); mkdir(datadir, 0777); } /* * If $MAXSCALE_HOME is set then write the logs into $MAXSCALE_HOME/log. * The skygw_logmanager_init expects to take arguments as passed to main * and proesses them with getopt, therefore we need to give it a dummy * argv[0] */ if (home) { char buf[1024]; char *argv[4]; sprintf(buf, "%s/log", home); mkdir(buf, 0777); argv[0] = "MaxScale"; argv[1] = "-g"; argv[2] = buf; argv[3] = NULL; skygw_logmanager_init(3, argv); } if (cnf_file == NULL) { skygw_log_write_flush( LOGFILE_ERROR, "Fatal : Unable to find a MaxScale configuration " "file, either install one in /etc/MaxScale.cnf, " "$MAXSCALE_HOME/etc/MaxScale.cnf " "or use the -c option. Exiting."); fprintf(stderr, "Unable to find MaxScale configuration file. " "Exiting.\n"); exit(1); } /* Update the server options */ for (i = 0; server_options[i]; i++) { if (!strcmp(server_options[i], "--datadir=")) { sprintf(ddopt, "--datadir=%s", datadir); server_options[i] = ddopt; } } if (mysql_library_init(num_elements, server_options, server_groups)) { skygw_log_write_flush( LOGFILE_ERROR, "Fatal : mysql_library_init failed. It is a " "mandatory component, required by router services and " "the MaxScale core. Error %s, %s : %d. Exiting.", mysql_error(NULL), __FILE__, __LINE__); fprintf(stderr, "Failed to initialise the MySQL library. Exiting.\n"); exit(1); } libmysqld_started = TRUE; if (!config_load(cnf_file)) { skygw_log_write_flush( LOGFILE_ERROR, "Fatal : Failed to load MaxScale configuration file %s. " "Exiting.", cnf_file); fprintf(stderr, "Failed to load MaxScale configuration file. " "Exiting.\n"); exit(1); } skygw_log_write( LOGFILE_MESSAGE, "SkySQL MaxScale (C) SkySQL Ab 2013"); skygw_log_write( LOGFILE_MESSAGE, "MaxScale is starting, PID %i", getpid()); poll_init(); /* * Start the services that were created above */ n_services = serviceStartAll(); if (n_services == 0) { skygw_log_write_flush( LOGFILE_ERROR, "Fatal : Failed to start any MaxScale services. " "Exiting."); fprintf(stderr, "Failed to start any MaxScale services. Exiting.\n"); exit(1); } skygw_log_write( LOGFILE_MESSAGE, "Started %d services succesfully.", n_services); /** * Start periodic log flusher thread. */ log_flush_timeout_ms = 1000; log_flush_thr = thread_start(log_flush_cb, (void *)&log_flush_timeout_ms); /* * Start the polling threads, note this is one less than is * configured as the main thread will also poll. */ n_threads = config_threadcount(); threads = (void **)calloc(n_threads, sizeof(void *)); for (n = 0; n < n_threads - 1; n++) threads[n] = thread_start(poll_waitevents, (void *)(n + 1)); poll_waitevents((void *)0); for (n = 0; n < n_threads - 1; n++) thread_wait(threads[n]); free(threads); /** * Wait the flush thread. */ thread_wait(log_flush_thr); /* Stop all the monitors */ monitorStopAll(); skygw_log_write( LOGFILE_MESSAGE, "MaxScale shutdown, PID %i\n", getpid()); datadir_cleanup(); return 0; } // End of main /** * Shutdown the gateway */ void shutdown_gateway() { poll_shutdown(); log_flush_shutdown(); } static void log_flush_shutdown(void) { do_exit = TRUE; } static void log_flush_cb( void* arg) { ssize_t timeout_ms = *(ssize_t *)arg; skygw_log_write(LOGFILE_MESSAGE, "Started MaxScale log flusher."); while (!do_exit) { skygw_log_flush(LOGFILE_ERROR); skygw_log_flush(LOGFILE_MESSAGE); skygw_log_flush(LOGFILE_TRACE); usleep(timeout_ms*1000); } skygw_log_write(LOGFILE_MESSAGE, "Finished MaxScale log flusher."); }