/*
 * $Header: /cvsroot/pgsql/contrib/pgbench/pgbench.c,v 1.1 2000/01/15 12:38:09 ishii Exp $
 *
 * pgbench: a simple TPC-B like benchmark program for PostgreSQL
 * written by Tatsuo Ishii
 *
 * Copyright (c) 2000  Tatsuo Ishii
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that the above copyright notice appear in all
 * copies and that both that copyright notice and this permission
 * notice appear in supporting documentation, and that the name of the
 * author not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior
 * permission. The author makes no representations about the
 * suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 */

#include "config.h"

#include <stdio.h>
#include "postgres.h"
#include "libpq-fe.h"

#include <errno.h>

#ifdef WIN32
#include "win32.h"
#else
#include <sys/time.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

/* for getrlimit */
#include <sys/resource.h>

#endif	 /* WIN32 */

/********************************************************************
 * some configurable parameters */

#define MAXCLIENTS 1024	/* max number of clients allowed */

int nclients = 1;	/* default number of simulated clients */
int nxacts = 10;	/* default number of transactions per clients */

/*
 * scaling factor. for example, tps = 10 will make 1000000 tuples of
 * accounts table.
 */
int tps = 1;

/*
 * end of configurable parameters
 *********************************************************************/

#define nbranches	1
#define ntellers	10
#define	naccounts	100000

int remains;		/* number of remained clients */

typedef struct {
  PGconn	*con;	/* connection handle to DB */
  int	state;	/* state No. */
  int	cnt;	/* xacts count */
  int	ecnt;	/* error count */
  int	listen;	/* none 0 indicates that an async query has been sent */
  int	aid;	/* account id for this transaction */
  int	bid;	/* branch id for this transaction */
  int	tid;	/* teller id for this transaction */
  int	delta;
  int	abalance;
} CState;

static void usage() {
  fprintf(stderr,"usage: pgbench [-h hostname][-p port][-c nclients][-t ntransactions][-s scaling_factor][-n][-v][-S][-d][dbname]\n");
  fprintf(stderr,"(initialize mode): pgbench -i [-h hostname][-p port][-s scaling_factor][-d][dbname]\n");
}

/* random number generator */
static int getrand(int min, int max) {
  return(min+(int)(max*1.0*rand()/(RAND_MAX+1.0)));
}

/* throw away response from backend */
static void discard_response(CState *state) {
  PGresult *res;
  do {
    res = PQgetResult(state->con);
    if (res)
      PQclear(res);
  } while(res);
}

static int check(CState *state, PGresult *res, int n, int good)
{
  CState *st = &state[n];

  if (res && PQresultStatus(res) != good) {
    fprintf(stderr,"Client %d aborted in state %d: %s",n,st->state,PQerrorMessage(st->con));
    remains--;	/* I've aborted */
    PQfinish(st->con);
    st->con = NULL;
    return(-1);
  }
  return(0);
}

/* process a transaction */
static void doOne(CState *state, int n, int debug) {
  char sql[256];
  PGresult   *res;
  CState *st = &state[n];

  if (st->listen) {	/* are we receiver? */
    if (debug) {
      fprintf(stderr,"client %d receiving\n",n);
    }
    while (PQisBusy(st->con) == TRUE) {
      if (!PQconsumeInput(st->con)) {	/* there's something wrong */
	fprintf(stderr, "Client %d aborted in state %d. Probably the backend died while processing.\n",n, st->state);
	remains--;	/* I've aborted */
	PQfinish(st->con);
	st->con = NULL;
	return;
      }
    }

    switch (st->state) {
    case 0:	/* response to "begin" */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 1:	/* response to "update accounts..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 2:	/* response to "select abalance ..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_TUPLES_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 3:	/* response to "update tellers ..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 4:	/* response to "update branches ..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 5:	/* response to "insert into history ..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);
      break;
    case 6:	/* response to "end" */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_COMMAND_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);

      if (++st->cnt >= nxacts) {
	remains--;	/* I've done */
	PQfinish(st->con);
	st->con = NULL;
	return;
      }
      break;
    }

    /* increment state counter */
    st->state++;
    if (st->state > 6) {
      st->state = 0;
    }
  }

  switch (st->state) {
  case 0:	/* about to start */
    strcpy(sql,"begin");
    st->aid = getrand(1,naccounts*tps);
    st->bid = getrand(1,nbranches*tps);
    st->tid = getrand(1,ntellers*tps);
    st->delta = getrand(1,1000);
    break;
  case 1:
    sprintf(sql,"update accounts set abalance = abalance + %d where aid = %d\n",st->delta,st->aid);
      break;
  case 2:
    sprintf(sql,"select abalance from accounts where aid = %d",st->aid);
    break;
  case 3:
    sprintf(sql,"update tellers set tbalance = tbalance + %d where tid = %d\n",
	    st->delta,st->tid);
    break;
  case 4:
    sprintf(sql,"update branches set bbalance = bbalance + %d where bid = %d",st->delta,st->bid);
    break;
  case 5:
    sprintf(sql,"insert into history(tid,bid,aid,delta,time) values(%d,%d,%d,%d,'now')",
	    st->tid,st->bid,st->aid,st->delta);
    break;
  case 6:
    strcpy(sql,"end");
    break;
  }

  if (debug) {
    fprintf(stderr,"client %d sending %s\n",n,sql);
  }
  if (PQsendQuery(st->con, sql) == 0) {
    if (debug) {
      fprintf(stderr, "PQsendQuery(%s)failed\n",sql);
    }
    st->ecnt++;
  } else {
    st->listen++;	/* flags that should be listned */
  }
}

/* process a select only transaction */
static void doSelectOnly(CState *state, int n, int debug) {
  char sql[256];
  PGresult   *res;
  CState *st = &state[n];

  if (st->listen) {	/* are we receiver? */
    if (debug) {
      fprintf(stderr,"client %d receiving\n",n);
    }
    while (PQisBusy(st->con) == TRUE) {
      if (!PQconsumeInput(st->con)) {	/* there's something wrong */
	fprintf(stderr, "Client %d aborted in state %d. Probably the backend died while processing.\n",n, st->state);
	remains--;	/* I've aborted */
	PQfinish(st->con);
	st->con = NULL;
	return;
      }
    }

    switch (st->state) {
    case 0:	/* response to "select abalance ..." */
      res = PQgetResult(st->con);
      if (check(state, res, n, PGRES_TUPLES_OK)) {
	return;
      }
      PQclear(res);
      discard_response(st);

      if (++st->cnt >= nxacts) {
	remains--;	/* I've done */
	PQfinish(st->con);
	st->con = NULL;
	return;
      }
      break;
    }

    /* increment state counter */
    st->state++;
    if (st->state > 0) {
      st->state = 0;
    }
  }

  switch (st->state) {
  case 0:
    st->aid = getrand(1,naccounts*tps);
    sprintf(sql,"select abalance from accounts where aid = %d",st->aid);
    break;
  }

  if (debug) {
    fprintf(stderr,"client %d sending %s\n",n,sql);
  }

  if (PQsendQuery(st->con, sql) == 0) {
    if (debug) {
      fprintf(stderr, "PQsendQuery(%s)failed\n",sql);
    }
    st->ecnt++;
  } else {
    st->listen++;	/* flags that should be listned */
  }
}

/* discard connections */
static void disconnect_all(CState *state) {
  int i;
  for (i=0;i<nclients;i++) {
    if (state[i].con) {
      PQfinish(state[i].con);
    }
  }
}

/* create tables and setup data */
static void init(char *pghost, char *pgport,char *dbName) {
  PGconn *con;
  PGresult *res;
  static char *DDLs[] = {
    "drop table branches",
    "create table branches(bid int, primary key(bid),bbalance int,filler char(88))",
    "drop table tellers",
    "create table tellers(tid int, primary key(tid),bid int,tbalance int,filler char(84))",
    "drop table accounts",
    "create table accounts(aid int,primary key(aid),bid int,abalance int,filler char(84))",
    "drop table history",
    "create table history(tid int,bid int,aid int,delta int,time timestamp,filler char(22))"};
  char sql[256];

  int i;

  con = PQsetdb(pghost, pgport, NULL, NULL, dbName);
  if (PQstatus(con) == CONNECTION_BAD) {
    fprintf(stderr, "Connection to database '%s' on %s failed.\n", dbName,pghost);
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }

  for (i=0;i<(sizeof(DDLs)/sizeof(char *));i++) {
    res = PQexec(con,DDLs[i]);
    if (strncmp(DDLs[i],"drop",4) && PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);
  }

  res = PQexec(con,"begin");
  if (PQresultStatus(res) != PGRES_COMMAND_OK) {
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }

  for(i = 0; i < nbranches * tps; i++) {
    sprintf(sql,"insert into branches(bid,bbalance) values(%d,0)",i+1);
    res = PQexec(con,sql);
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);
  }

  for(i = 0; i < ntellers * tps; i++) {
    sprintf(sql,"insert into tellers(tid,bid,tbalance) values (%d,%d,0)"
	    ,i+1,i/ntellers+1);
    res = PQexec(con,sql);
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);
  }

  res = PQexec(con,"copy accounts from stdin");
  if (PQresultStatus(res) != PGRES_COPY_IN) {
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }
  PQclear(res);

  fprintf(stderr,"creating tables...\n");
  for(i = 0; i < naccounts*tps; i++) {
    int j = i + 1;
    sprintf(sql,"%d\t%d\t%d\t\n",i+1,(i+1)/naccounts,0);
    if (PQputline(con,sql)) {
      fprintf(stderr,"PQputline failed\n");
      exit(1);
    }
    if (j % 10000 == 0) {
      fprintf(stderr,"%d tuples done.\n",j);
    }
  }
  if (PQputline(con,"\\.\n")) {
    fprintf(stderr,"very last PQputline failed\n");
    exit(1);
  }

  if (PQendcopy(con)) {
    fprintf(stderr,"PQendcopy failed\n");
    exit(1);
  }

  res = PQexec(con,"end");
  if (PQresultStatus(res) != PGRES_COMMAND_OK) {
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }

  /* vacuum */
  fprintf(stderr,"vacuum...");
  res = PQexec(con,"vacuum analyze");
  if (PQresultStatus(res) != PGRES_COMMAND_OK) {
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }
  fprintf(stderr,"done.\n");

  PQfinish(con);
}

/* print out results */
static void printResults(
			 int ttype, CState *state, 
			 struct timeval *tv1,struct timeval *tv2,
			 struct timeval *tv3) {
  double t1,t2;
  int i;
  int normal_xacts = 0;

  for (i=0;i<nclients;i++) {
    normal_xacts += state[i].cnt;
  }

  t1 = (tv3->tv_sec - tv1->tv_sec)*1000000.0+(tv3->tv_usec - tv1->tv_usec);
  t1 = normal_xacts*1000000.0/t1;

  t2 = (tv3->tv_sec - tv2->tv_sec)*1000000.0+(tv3->tv_usec - tv2->tv_usec);
  t2 = normal_xacts*1000000.0/t2;

  printf("transaction type: %s\n",ttype==0?"TPC-B (sort of)":"SELECT only");
  printf("scaling factor: %d\n",tps);
  printf("number of clients: %d\n",nclients);
  printf("number of transactions per client: %d\n",nxacts);
  printf("number of transactions actually processed: %d/%d\n",normal_xacts,nxacts*nclients);
  printf("tps = %f(including connections establishing)\n",t1);
  printf("tps = %f(excluding connections establishing)\n",t2);
}

int main(int argc, char **argv) {
  extern char *optarg;
  extern int optind, opterr, optopt;
  int c;
  char *pghost = "";
  char *pgport = "";
  char *dbName;
  int is_init_mode = 0;	/* initialize mode? */
  int is_no_vacuum = 0;	/* no vacuum at all before testing? */
  int is_full_vacuum = 0;	/* do full vacuum before testing? */
  int debug = 0;	/* debug flag */
  int ttype = 0;	/* transaction type. 0: TPC-B, 1: SELECT only */

  static CState	   state[MAXCLIENTS];	/* clients status */

  struct timeval tv1;	/* start up time */
  struct timeval tv2;	/* after establishing all connections to the backend */
  struct timeval tv3;	/* end time */

  int	i;

  fd_set	input_mask;
  int nsocks;	/* return from select(2) */
  int maxsock;	/* max socket number to be waited */

#ifndef __CYGWIN32__
  struct rlimit rlim;
#endif

  PGconn *con;
  PGresult *res;

  while ((c = getopt(argc, argv, "ih:nvp:dc:t:s:S")) != EOF) {
    switch (c) {
    case 'i':
      is_init_mode++;
      break;
    case 'h':
      pghost = optarg;
      break;
    case 'n':
      is_no_vacuum++;
      break;
    case 'v':
      is_full_vacuum++;
      break;
    case 'p':
      pgport = optarg;
      break;
    case 'd':
      debug++;
      break;
    case 'S':
      ttype = 1;
      break;
    case 'c':
      nclients = atoi(optarg);
      if (nclients <= 0 || nclients > MAXCLIENTS) {
	fprintf(stderr,"wrong number of clients: %d\n",nclients);
	exit(1);
      }
#ifndef __CYGWIN32__
#ifdef HAVE_RLIMIT_NOFILE	/* most platform uses RLIMIT_NOFILE */
      if (getrlimit(RLIMIT_NOFILE,&rlim) == -1) {
#else	/* but BSD doesn't ... */
      if (getrlimit(RLIMIT_OFILE,&rlim) == -1) {
#endif /* HAVE_RLIMIT_NOFILE */
	fprintf(stderr,"getrlimit failed. reason: %s\n",strerror(errno));
	exit(1);
      }
      if (rlim.rlim_cur <= (nclients+2)) {
	fprintf(stderr,"You need at least %d open files resource but you are only allowed to use %ld.\n",nclients+2,rlim.rlim_cur);
	fprintf(stderr,"Use limit/ulimt to increase the limit before using pgbench.\n");
	exit(1);
      }
#endif /* #ifndef __CYGWIN32__ */
      break;
    case 's':
      tps = atoi(optarg);
      if (tps <= 0) {
	fprintf(stderr,"wrong scaling factor: %d\n",tps);
	exit(1);
      }
      break;
    case 't':
      nxacts = atoi(optarg);
      if (nxacts <= 0) {
	fprintf(stderr,"wrong number of transactions: %d\n",nxacts);
	exit(1);
      }
      break;
    default:
      usage();
      exit(1);
      break;
    }
  }

  if (argc > optind) {
    dbName = argv[optind];
  } else {
    dbName = getenv("USER");
    if (dbName == NULL) {
      dbName = "";
    }
  }

  if (is_init_mode) {
    init(pghost, pgport, dbName);
    exit(0);
  }

  remains = nclients;

  if (debug) {
    printf("pghost: %s pgport: %s nclients: %d nxacts: %d dbName: %s\n",
	   pghost, pgport, nclients, nxacts, dbName);
  }

  /* opening connection... */
  con = PQsetdb(pghost, pgport, NULL, NULL, dbName);
  if (PQstatus(con) == CONNECTION_BAD) {
    fprintf(stderr, "Connection to database '%s' failed.\n", dbName);
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }

  /* get the scaling factor that should be same as count(*) from branches... */
  res = PQexec(con,"select count(*) from branches");
  if (PQresultStatus(res) != PGRES_TUPLES_OK) {
    fprintf(stderr, "%s", PQerrorMessage(con));
    exit(1);
  }
  tps = atoi(PQgetvalue(res, 0, 0));
  if (tps < 0) {
    fprintf(stderr,"count(*) from branches invalid (%d)\n",tps);
    exit(1);
  }
  PQclear(res);

  if (!is_no_vacuum) {
    fprintf(stderr,"starting vacuum...");
    res = PQexec(con,"vacuum branches");
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);

    res = PQexec(con,"vacuum tellers");
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);

    res = PQexec(con,"delete from history");
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);
    res = PQexec(con,"vacuum history");
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
      fprintf(stderr, "%s", PQerrorMessage(con));
      exit(1);
    }
    PQclear(res);

    fprintf(stderr,"end.\n");

    if (is_full_vacuum) {
      fprintf(stderr,"starting full vacuum...");
      res = PQexec(con,"vacuum analyze accounts");
      if (PQresultStatus(res) != PGRES_COMMAND_OK) {
	fprintf(stderr, "%s", PQerrorMessage(con));
	exit(1);
      }
      PQclear(res);
      fprintf(stderr,"end.\n");
    }
  }
  PQfinish(con);

  /* set random seed */
  gettimeofday(&tv1, 0);
  srand((uint)tv1.tv_usec);

  /* get start up time */
  gettimeofday(&tv1, 0);

  /* make connections to the database */
  for (i=0;i<nclients;i++) {
    state[i].con = PQsetdb(pghost, pgport, NULL, NULL, dbName);
    if (PQstatus(state[i].con) == CONNECTION_BAD) {
      fprintf(stderr, "Connection to database '%s' failed.\n", dbName);
      fprintf(stderr, "%s", PQerrorMessage(state[i].con));
      exit(1);
    }
  }

  /* time after connections set up */
  gettimeofday(&tv2, 0);

  /* send start up quries in async manner */
  for (i=0;i<nclients;i++) {
    if (ttype == 0) {
      doOne(state, i, debug);
    } else if (ttype == 1) {
      doSelectOnly(state, i, debug);
    }
  }

  for (;;) {
    if (remains <= 0) {	/* all done ? */
      disconnect_all(state);
      /* get end time */
      gettimeofday(&tv3, 0);
      printResults(ttype, state, &tv1,&tv2,&tv3);
      exit(0);
    }

    FD_ZERO(&input_mask);

    maxsock = 0;
    for (i=0;i<nclients;i++) {
      if (state[i].con) {
	int sock = PQsocket(state[i].con);
	if (sock < 0) {
	  fprintf(stderr,"Client %d: PQsock failed\n",i);
	  disconnect_all(state);
	  exit(1);
	}
	FD_SET(sock, &input_mask);
	if (maxsock < sock) {
	  maxsock = sock;
	}
      }
    }

    if ((nsocks = select(maxsock +1, &input_mask, (fd_set *)NULL,
			 (fd_set *)NULL, (struct timeval *)NULL)) < 0) {
      if (errno == EINTR) {
	continue;
      }
      /* must be something wrong */
      disconnect_all(state);
      fprintf(stderr,"select failed: %s\n",strerror(errno));
      exit(1);
    } else if (nsocks == 0) { /* timeout */
      fprintf(stderr,"select timeout\n");
      for (i=0;i<nclients;i++) {
	fprintf(stderr,"client %d:state %d cnt %d ecnt %d listen %d\n",
		i,state[i].state,state[i].cnt,state[i].ecnt,state[i].listen);
      }
      exit(0);
    }

    /* ok, backend returns reply */
    for (i=0;i<nclients;i++) {
      if (state[i].con && FD_ISSET(PQsocket(state[i].con), &input_mask)) {
	if (ttype == 0) {
	  doOne(state, i, debug);
	} else if (ttype == 1) {
	  doSelectOnly(state, i, debug);
	}
      }
    }
  }
}