/* 
   simple ctdb benchmark

   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 "lib/events/events.h"
#include "system/filesys.h"
#include "popt.h"
#include "cmdline.h"

#include <sys/time.h>
#include <time.h>

static struct timeval tp1,tp2;

static void start_timer(void)
{
	gettimeofday(&tp1,NULL);
}

static double end_timer(void)
{
	gettimeofday(&tp2,NULL);
	return (tp2.tv_sec + (tp2.tv_usec*1.0e-6)) - 
		(tp1.tv_sec + (tp1.tv_usec*1.0e-6));
}


static int timelimit = 10;
static int num_records = 10;
static int num_nodes;

enum my_functions {FUNC_INCR=1, FUNC_FETCH=2};

/*
  ctdb call function to increment an integer
*/
static int incr_func(struct ctdb_call_info *call)
{
	if (call->record_data.dsize == 0) {
		call->new_data = talloc(call, TDB_DATA);
		if (call->new_data == NULL) {
			return CTDB_ERR_NOMEM;
		}
		call->new_data->dptr = talloc_size(call, 4);
		call->new_data->dsize = 4;
		*(uint32_t *)call->new_data->dptr = 0;
	} else {
		call->new_data = &call->record_data;
	}
	(*(uint32_t *)call->new_data->dptr)++;
	return 0;
}

/*
  ctdb call function to fetch a record
*/
static int fetch_func(struct ctdb_call_info *call)
{
	call->reply_data = &call->record_data;
	return 0;
}


static int msg_count;
static int msg_plus, msg_minus;

/*
  handler for messages in bench_ring()
*/
static void ring_message_handler(struct ctdb_context *ctdb, uint64_t srvid, 
				 TDB_DATA data, void *private_data)
{
	int incr = *(int *)data.dptr;
	int *count = (int *)private_data;
	int dest;
	(*count)++;
	dest = (ctdb_get_vnn(ctdb) + incr) % num_nodes;
	ctdb_send_message(ctdb, dest, srvid, data);
	if (incr == 1) {
		msg_plus++;
	} else {
		msg_minus++;
	}
}

/*
  benchmark sending messages in a ring around the nodes
*/
static void bench_ring(struct ctdb_context *ctdb, struct event_context *ev)
{
	int vnn=ctdb_get_vnn(ctdb);

	if (vnn == 0) {
		/* two messages are injected into the ring, moving
		   in opposite directions */
		int dest, incr;
		TDB_DATA data;
		
		data.dptr = (uint8_t *)&incr;
		data.dsize = sizeof(incr);

		incr = 1;
		dest = (ctdb_get_vnn(ctdb) + incr) % num_nodes;
		ctdb_send_message(ctdb, dest, 0, data);
		
		incr = -1;
		dest = (ctdb_get_vnn(ctdb) + incr) % num_nodes;
		ctdb_send_message(ctdb, dest, 0, data);
	}
	
	start_timer();

	while (end_timer() < timelimit) {
		if (vnn == 0 && msg_count % 10000 == 0) {
			printf("Ring: %.2f msgs/sec (+ve=%d -ve=%d)\r", 
			       msg_count/end_timer(), msg_plus, msg_minus);
			fflush(stdout);
		}
		event_loop_once(ev);
	}

	printf("Ring: %.2f msgs/sec (+ve=%d -ve=%d)\n", 
	       msg_count/end_timer(), msg_plus, msg_minus);
}

/*
  handler for reconfigure message
*/
static void reconfigure_handler(struct ctdb_context *ctdb, uint64_t srvid, 
				TDB_DATA data, void *private_data)
{
	int *ready = (int *)private_data;
	*ready = 1;
}


/*
  main program
*/
int main(int argc, const char *argv[])
{
	struct ctdb_context *ctdb;
	struct ctdb_db_context *ctdb_db;

	struct poptOption popt_options[] = {
		POPT_AUTOHELP
		POPT_CTDB_CMDLINE
		{ "timelimit", 't', POPT_ARG_INT, &timelimit, 0, "timelimit", "integer" },
		{ "num-records", 'r', POPT_ARG_INT, &num_records, 0, "num_records", "integer" },
		{ NULL, 'n', POPT_ARG_INT, &num_nodes, 0, "num_nodes", "integer" },
		POPT_TABLEEND
	};
	int opt;
	const char **extra_argv;
	int extra_argc = 0;
	int ret;
	poptContext pc;
	struct event_context *ev;
	int cluster_ready=0;

	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++;
	}

	ev = s4_event_context_init(NULL);

	/* initialise ctdb */
	ctdb = ctdb_cmdline_client(ev);

	ctdb_set_message_handler(ctdb, CTDB_SRVID_RECONFIGURE, reconfigure_handler, 
				 &cluster_ready);

	/* attach to a specific database */
	ctdb_db = ctdb_attach(ctdb, "test.tdb");
	if (!ctdb_db) {
		printf("ctdb_attach failed - %s\n", ctdb_errstr(ctdb));
		exit(1);
	}

	/* setup a ctdb call function */
	ret = ctdb_set_call(ctdb_db, incr_func,  FUNC_INCR);
	ret = ctdb_set_call(ctdb_db, fetch_func, FUNC_FETCH);

	if (ctdb_set_message_handler(ctdb, 0, ring_message_handler,&msg_count))
		goto error;

	printf("Waiting for cluster\n");
	while (1) {
		uint32_t recmode=1;
		ctdb_ctrl_getrecmode(ctdb, timeval_zero(), CTDB_CURRENT_NODE, &recmode);
		if (recmode == 0) break;
		event_loop_once(ev);
	}

	bench_ring(ctdb, ev);
       
error:
	return 0;
}
