/* 
   standalone ctdb daemon

   Copyright (C) Andrew Tridgell  2006

   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 "includes.h"
#include "system/filesys.h"
#include "popt.h"
#include "system/time.h"
#include "system/wait.h"
#include "system/network.h"
#include "cmdline.h"
#include "../include/ctdb_private.h"

static struct {
	const char *nlist;
	const char *transport;
	const char *myaddress;
	const char *public_address_list;
	const char *event_script_dir;
	const char *notification_script;
	const char *debug_hung_script;
	const char *logfile;
	const char *recovery_lock_file;
	const char *db_dir;
	const char *db_dir_persistent;
	const char *db_dir_state;
	const char *public_interface;
	const char *single_public_ip;
	int         valgrinding;
	int         nosetsched;
	int         use_syslog;
	int         start_as_disabled;
	int         start_as_stopped;
	int         no_lmaster;
	int         no_recmaster;
	int         lvs;
	int	    script_log_level;
	int         no_publicipcheck;
	int         max_persistent_check_errors;
} options = {
	.nlist = ETCDIR "/ctdb/nodes",
	.transport = "tcp",
	.event_script_dir = ETCDIR "/ctdb/events.d",
	.logfile = LOGDIR "/log.ctdb",
	.db_dir = VARDIR "/ctdb",
	.db_dir_persistent = VARDIR "/ctdb/persistent",
	.db_dir_state = VARDIR "/ctdb/state",
	.script_log_level = DEBUG_ERR,
	.debug_hung_script = ETCDIR "/ctdb/debug-hung-script.sh",
};

int script_log_level;
bool fast_start;

/*
  called by the transport layer when a packet comes in
*/
static void ctdb_recv_pkt(struct ctdb_context *ctdb, uint8_t *data, uint32_t length)
{
	struct ctdb_req_header *hdr = (struct ctdb_req_header *)data;

	CTDB_INCREMENT_STAT(ctdb, node_packets_recv);

	/* up the counter for this source node, so we know its alive */
	if (ctdb_validate_pnn(ctdb, hdr->srcnode)) {
		/* as a special case, redirected calls don't increment the rx_cnt */
		if (hdr->operation != CTDB_REQ_CALL ||
		    ((struct ctdb_req_call *)hdr)->hopcount == 0) {
			ctdb->nodes[hdr->srcnode]->rx_cnt++;
		}
	}

	ctdb_input_pkt(ctdb, hdr);
}

void ctdb_load_nodes_file(struct ctdb_context *ctdb)
{
	int ret;

	ret = ctdb_set_nlist(ctdb, options.nlist);
	if (ret == -1) {
		DEBUG(DEBUG_ALERT,("ctdb_set_nlist failed - %s\n", ctdb_errstr(ctdb)));
		exit(1);
	}
}

static const struct ctdb_upcalls ctdb_upcalls = {
	.recv_pkt       = ctdb_recv_pkt,
	.node_dead      = ctdb_node_dead,
	.node_connected = ctdb_node_connected
};



/*
  main program
*/
int main(int argc, const char *argv[])
{
	struct ctdb_context *ctdb;
	int interactive = 0;

	struct poptOption popt_options[] = {
		POPT_AUTOHELP
		POPT_CTDB_CMDLINE
		{ "interactive", 'i', POPT_ARG_NONE, &interactive, 0, "don't fork", NULL },
		{ "public-addresses", 0, POPT_ARG_STRING, &options.public_address_list, 0, "public address list file", "filename" },
		{ "public-interface", 0, POPT_ARG_STRING, &options.public_interface, 0, "public interface", "interface"},
		{ "single-public-ip", 0, POPT_ARG_STRING, &options.single_public_ip, 0, "single public ip", "ip-address"},
		{ "event-script-dir", 0, POPT_ARG_STRING, &options.event_script_dir, 0, "event script directory", "dirname" },
		{ "logfile", 0, POPT_ARG_STRING, &options.logfile, 0, "log file location", "filename" },
		{ "nlist", 0, POPT_ARG_STRING, &options.nlist, 0, "node list file", "filename" },
		{ "notification-script", 0, POPT_ARG_STRING, &options.notification_script, 0, "notification script", "filename" },
		{ "debug-hung-script", 0, POPT_ARG_STRING, &options.debug_hung_script, 0, "debug script for hung eventscripts", "filename" },
		{ "listen", 0, POPT_ARG_STRING, &options.myaddress, 0, "address to listen on", "address" },
		{ "transport", 0, POPT_ARG_STRING, &options.transport, 0, "protocol transport", NULL },
		{ "dbdir", 0, POPT_ARG_STRING, &options.db_dir, 0, "directory for the tdb files", NULL },
		{ "dbdir-persistent", 0, POPT_ARG_STRING, &options.db_dir_persistent, 0, "directory for persistent tdb files", NULL },
		{ "dbdir-state", 0, POPT_ARG_STRING, &options.db_dir_state, 0, "directory for internal state tdb files", NULL },
		{ "reclock", 0, POPT_ARG_STRING, &options.recovery_lock_file, 0, "location of recovery lock file", "filename" },
		{ "valgrinding", 0, POPT_ARG_NONE, &options.valgrinding, 0, "disable setscheduler SCHED_FIFO call, use mmap for tdbs", NULL },
		{ "nosetsched", 0, POPT_ARG_NONE, &options.nosetsched, 0, "disable setscheduler SCHED_FIFO call, use mmap for tdbs", NULL },
		{ "syslog", 0, POPT_ARG_NONE, &options.use_syslog, 0, "log messages to syslog", NULL },
		{ "start-as-disabled", 0, POPT_ARG_NONE, &options.start_as_disabled, 0, "Node starts in disabled state", NULL },
		{ "start-as-stopped", 0, POPT_ARG_NONE, &options.start_as_stopped, 0, "Node starts in stopped state", NULL },
		{ "no-lmaster", 0, POPT_ARG_NONE, &options.no_lmaster, 0, "disable lmaster role on this node", NULL },
		{ "no-recmaster", 0, POPT_ARG_NONE, &options.no_recmaster, 0, "disable recmaster role on this node", NULL },
		{ "lvs", 0, POPT_ARG_NONE, &options.lvs, 0, "lvs is enabled on this node", NULL },
		{ "script-log-level", 0, POPT_ARG_INT, &options.script_log_level, DEBUG_ERR, "log level of event script output", NULL },
		{ "nopublicipcheck", 0, POPT_ARG_NONE, &options.no_publicipcheck, 0, "don't check we have/don't have the correct public ip addresses", NULL },
		{ "max-persistent-check-errors", 0, POPT_ARG_INT,
		  &options.max_persistent_check_errors, 0,
		  "max allowed persistent check errors (default 0)", NULL },
		{ "log-ringbuf-size", 0, POPT_ARG_INT, &log_ringbuf_size, DEBUG_ERR, "Number of log messages we can store in the memory ringbuffer", NULL },
		{ "sloppy-start", 0, POPT_ARG_NONE, &fast_start, 0, "Do not perform full recovery on start", NULL },
		POPT_TABLEEND
	};
	int opt, ret;
	const char **extra_argv;
	int extra_argc = 0;
	poptContext pc;
	struct event_context *ev;

	pc = poptGetContext(argv[0], argc, argv, popt_options, POPT_CONTEXT_KEEP_FIRST);

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		default:
			fprintf(stderr, "Invalid option %s: %s\n", 
				poptBadOption(pc, 0), poptStrerror(opt));
			exit(1);
		}
	}

	/* setup the remaining options for the main program to use */
	extra_argv = poptGetArgs(pc);
	if (extra_argv) {
		extra_argv++;
		while (extra_argv[extra_argc]) extra_argc++;
	}

	talloc_enable_null_tracking();

	ctdb_block_signal(SIGPIPE);
	fault_setup("ctdbd");

	ev = event_context_init(NULL);
	tevent_loop_allow_nesting(ev);

	ctdb = ctdb_cmdline_init(ev);

	ctdb->start_as_disabled = options.start_as_disabled;
	ctdb->start_as_stopped  = options.start_as_stopped;

	script_log_level = options.script_log_level;

	ret = ctdb_set_logfile(ctdb, options.logfile, options.use_syslog);
	if (ret == -1) {
		printf("ctdb_set_logfile to %s failed - %s\n", 
		       options.use_syslog?"syslog":options.logfile, ctdb_errstr(ctdb));
		exit(1);
	}

	DEBUG(DEBUG_NOTICE,("CTDB starting on node\n"));

	gettimeofday(&ctdb->ctdbd_start_time, NULL);
	gettimeofday(&ctdb->last_recovery_started, NULL);
	gettimeofday(&ctdb->last_recovery_finished, NULL);
	ctdb->recovery_mode    = CTDB_RECOVERY_NORMAL;
	ctdb->recovery_master  = (uint32_t)-1;
	ctdb->upcalls          = &ctdb_upcalls;
	ctdb->idr              = idr_init(ctdb);
	ctdb->recovery_lock_fd = -1;

	ctdb_tunables_set_defaults(ctdb);

	ret = ctdb_set_recovery_lock_file(ctdb, options.recovery_lock_file);
	if (ret == -1) {
		DEBUG(DEBUG_ALERT,("ctdb_set_recovery_lock_file failed - %s\n", ctdb_errstr(ctdb)));
		exit(1);
	}

	ret = ctdb_set_transport(ctdb, options.transport);
	if (ret == -1) {
		DEBUG(DEBUG_ALERT,("ctdb_set_transport failed - %s\n", ctdb_errstr(ctdb)));
		exit(1);
	}

	/* tell ctdb what address to listen on */
	if (options.myaddress) {
		ret = ctdb_set_address(ctdb, options.myaddress);
		if (ret == -1) {
			DEBUG(DEBUG_ALERT,("ctdb_set_address failed - %s\n", ctdb_errstr(ctdb)));
			exit(1);
		}
	}

	/* set ctdbd capabilities */
	ctdb->capabilities = 0;
	if (options.no_lmaster == 0) {
		ctdb->capabilities |= CTDB_CAP_LMASTER;
	}
	if (options.no_recmaster == 0) {
		ctdb->capabilities |= CTDB_CAP_RECMASTER;
	}
	if (options.lvs != 0) {
		ctdb->capabilities |= CTDB_CAP_LVS;
	}

	/* Initialise this node's PNN to the unknown value.  This will
	 * be set to the correct value by either ctdb_add_node() as
	 * part of loading the nodes file or by
	 * ctdb_tcp_listen_automatic() when the transport is
	 * initialised.  At some point we should de-optimise this and
	 * pull it out into ctdb_start_daemon() so it is done clearly
	 * and only in one place.
	 */
	ctdb->pnn = -1;

	/* tell ctdb what nodes are available */
	ctdb_load_nodes_file(ctdb);

	if (options.db_dir) {
		ret = ctdb_set_tdb_dir(ctdb, options.db_dir);
		if (ret == -1) {
			DEBUG(DEBUG_ALERT,("ctdb_set_tdb_dir failed - %s\n", ctdb_errstr(ctdb)));
			exit(1);
		}
	}
	if (options.db_dir_persistent) {
		ret = ctdb_set_tdb_dir_persistent(ctdb, options.db_dir_persistent);
		if (ret == -1) {
			DEBUG(DEBUG_ALERT,("ctdb_set_tdb_dir_persistent failed - %s\n", ctdb_errstr(ctdb)));
			exit(1);
		}
	}
	if (options.db_dir_state) {
		ret = ctdb_set_tdb_dir_state(ctdb, options.db_dir_state);
		if (ret == -1) {
			DEBUG(DEBUG_ALERT,("ctdb_set_tdb_dir_state failed - %s\n", ctdb_errstr(ctdb)));
			exit(1);
		}
	}

	if (options.public_interface) {
		ctdb->default_public_interface = talloc_strdup(ctdb, options.public_interface);
		CTDB_NO_MEMORY(ctdb, ctdb->default_public_interface);
	}

	if (options.single_public_ip) {
		if (options.public_interface == NULL) {
			DEBUG(DEBUG_ALERT,("--single_public_ip used but --public_interface is not specified. You must specify the public interface when using single public ip. Exiting\n"));
			exit(10);
		}

		ret = ctdb_set_single_public_ip(ctdb, options.public_interface,
						options.single_public_ip);
		if (ret != 0) {
			DEBUG(DEBUG_ALERT,("Invalid --single-public-ip argument : %s . This is not a valid ip address. Exiting.\n", options.single_public_ip));
			exit(10);
		}
	}

	ret = ctdb_set_event_script_dir(ctdb, options.event_script_dir);
	if (ret == -1) {
		DEBUG(DEBUG_ALERT,("Unable to setup event script directory\n"));
		exit(1);
	}

	if (options.notification_script != NULL) {
		ret = ctdb_set_notification_script(ctdb, options.notification_script);
		if (ret == -1) {
			DEBUG(DEBUG_ALERT,("Unable to setup notification script\n"));
			exit(1);
		}
	}

	if (options.debug_hung_script != NULL) {
		ret = ctdb_set_debug_hung_script(ctdb, options.debug_hung_script);
	}
	if (ret == -1) {
		DEBUG(DEBUG_ALERT,("Unable to setup script to debug hung eventscripts\n"));
		exit(1);
	}

	ctdb->valgrinding = options.valgrinding;
	if (options.valgrinding || options.nosetsched) {
		ctdb->do_setsched = 0;
	} else {
		ctdb->do_setsched = 1;
	}

	ctdb->do_checkpublicip = !options.no_publicipcheck;

	if (options.max_persistent_check_errors < 0) {
		ctdb->max_persistent_check_errors = 0xFFFFFFFFFFFFFFFFLL;
	} else {
		ctdb->max_persistent_check_errors = (uint64_t)options.max_persistent_check_errors;
	}

	if (getenv("CTDB_BASE") == NULL) {
		/* setup a environment variable for the event scripts to use
		   to find the installation directory */
		setenv("CTDB_BASE", ETCDIR "/ctdb", 1);
	}

	/* start the protocol running (as a child) */
	return ctdb_start_daemon(ctdb, interactive?false:true, options.use_syslog, options.public_address_list);
}
