/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2007-2009 Oracle.  All rights reserved.
 *
 * $Id$ 
 */

#include "TpcbExample.h"

#define	HISTORY_LEN	    100
#define	RECLEN		    100
#define	BEGID		1000000

struct Defrec {
	u_int32_t   id;
	u_int32_t   balance;
	u_int8_t    pad[RECLEN - sizeof(u_int32_t) - sizeof(u_int32_t)];
};

struct Histrec {
	u_int32_t   aid;
	u_int32_t   bid;
	u_int32_t   tid;
	u_int32_t   amount;
	u_int8_t    pad[RECLEN - 4 * sizeof(u_int32_t)];
};

const char *progname = "wce_tpcb";

TpcbExample::TpcbExample()
:	dbenv(0), accounts(ACCOUNTS), branches(BRANCHES),
	tellers(TELLERS), history(HISTORY), fast_mode(1), verbose(0),
	cachesize(0)
{
	rand_seed = GetTickCount();
	setHomeDir(TESTDIR);
}

int TpcbExample::createEnv(int flags)
{
	int ret;
	u_int32_t local_flags;

	// If the env object already exists, close and re-open
	// don't just return immediately, since advanced options
	// may have been altered (cachesize, NOSYNC..)
	if (dbenv != NULL)
		closeEnv();

	srand(rand_seed);

	if ((ret = db_env_create(&dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "%s: db_env_create: %s\n", progname, db_strerror(ret));
		return (1);
	}
	dbenv->set_errcall(dbenv, &tpcb_errcallback);
	dbenv->set_errpfx(dbenv, "TpcbExample");
	dbenv->set_cachesize(dbenv, 0, cachesize == 0 ?
			    1 * 1024 * 1024 : (u_int32_t)cachesize, 0);

	if (fast_mode)
		dbenv->set_flags(dbenv, DB_TXN_NOSYNC, 1);

	local_flags = DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG |
	    DB_INIT_MPOOL | DB_INIT_TXN;
	dbenv->open(dbenv, homeDirName, local_flags, 0);
	return (0);
}

void TpcbExample::closeEnv()
{
	if (dbenv != NULL) {
		dbenv->close(dbenv, 0);
		dbenv = 0;
	}
}

//
// Initialize the database to the specified number of accounts, branches,
// history records, and tellers.
//
int
TpcbExample::populate()
{
	DB *dbp;

	int err;
	u_int32_t balance, idnum;
	u_int32_t end_anum, end_bnum, end_tnum;
	u_int32_t start_anum, start_bnum, start_tnum;

	idnum = BEGID;
	balance = 500000;

	if ((err = db_create(&dbp, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of accounts db failed.");
		return (1);
	}
	dbp->set_h_nelem(dbp, (unsigned int)accounts);

	if ((err = dbp->open(dbp, NULL, "account", NULL, DB_HASH,
			     DB_CREATE, 0644)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Account file create failed. error: %s.", db_strerror(err));
		return (1);
	}

	start_anum = idnum;
	if ((err =
	    populateTable(dbp, idnum, balance, accounts, "account")) != 0)
		return (1);
	idnum += accounts;
	end_anum = idnum - 1;
	if ((err = dbp->close(dbp, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Account file close failed. error: %s.", db_strerror(err));
		return (1);
	}

	if ((err = db_create(&dbp, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of branches db failed.");
		return (1);
	}
	//
	// Since the number of branches is very small, we want to use very
	// small pages and only 1 key per page.  This is the poor-man's way
	// of getting key locking instead of page locking.
	//
	dbp->set_h_ffactor(dbp, 1);
	dbp->set_h_nelem(dbp, (unsigned int)branches);
	dbp->set_pagesize(dbp, 512);

	if ((err = dbp->open(dbp, NULL, "branch", NULL, DB_HASH,
			     DB_CREATE, 0644)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Branch file create failed. error: %s.", db_strerror(err));
		return (1);
	}
	start_bnum = idnum;
	if ((err = populateTable(dbp, idnum, balance, branches, "branch")) != 0)
		return (1);
	idnum += branches;
	end_bnum = idnum - 1;
	if ((err = dbp->close(dbp, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Close of branch file failed. error: %s.",
		    db_strerror(err));
		return (1);
	}

	if ((err = db_create(&dbp, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of teller db failed.");
		return (1);
	}
	//
	// In the case of tellers, we also want small pages, but we'll let
	// the fill factor dynamically adjust itself.
	//
	dbp->set_h_ffactor(dbp, 0);
	dbp->set_h_nelem(dbp, (unsigned int)tellers);
	dbp->set_pagesize(dbp, 512);

	if ((err = dbp->open(dbp, NULL, "teller", NULL, DB_HASH,
			     DB_CREATE, 0644)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Teller file create failed. error: %s.", db_strerror(err));
		return (1);
	}

	start_tnum = idnum;
	if ((err = populateTable(dbp, idnum, balance, tellers, "teller")) != 0)
		return (1);
	idnum += tellers;
	end_tnum = idnum - 1;
	if ((err = dbp->close(dbp, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Close of teller file failed. error: %s.",
		    db_strerror(err));
		return (1);
	}

	if ((err = db_create(&dbp, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of history db failed.");
		return (1);
	}
	dbp->set_re_len(dbp, HISTORY_LEN);
	if ((err = dbp->open(dbp, NULL, "history", NULL, DB_RECNO,
			     DB_CREATE, 0644)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Create of history file failed. error: %s.",
		    db_strerror(err));
		return (1);
	}

	populateHistory(dbp, history, accounts, branches, tellers);
	if ((err = dbp->close(dbp, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Close of history file failed. error: %s.",
		    db_strerror(err));
		return (1);
	}

	_snprintf(msgString, ERR_STRING_MAX, "Populated OK.");
	return (0);
}

int
TpcbExample::populateTable(DB *dbp,
			   u_int32_t start_id, u_int32_t balance,
			   int nrecs, const char *msg)
{
	DBT kdbt, ddbt;
	Defrec drec;
	memset(&drec.pad[0], 1, sizeof(drec.pad));

	memset(&kdbt, 0, sizeof(kdbt));
	memset(&ddbt, 0, sizeof(ddbt));
	kdbt.data = &drec.id;
	kdbt.size = sizeof(u_int32_t);
	ddbt.data = &drec;
	ddbt.size = sizeof(drec);

	for (int i = 0; i < nrecs; i++) {
		drec.id = start_id + (u_int32_t)i;
		drec.balance = balance;
		int err;
		if ((err =
		    dbp->put(dbp, NULL, &kdbt, &ddbt, DB_NOOVERWRITE)) != 0) {
			_snprintf(msgString, ERR_STRING_MAX,
		"Failure initializing %s file: %s. Likely re-initializing.",
			    msg, db_strerror(err));
			return (1);
		}
	}
	return (0);
}

int
TpcbExample::populateHistory(DB *dbp, int nrecs, u_int32_t accounts,
			     u_int32_t branches, u_int32_t tellers)
{
	DBT kdbt, ddbt;
	Histrec hrec;
	memset(&hrec.pad[0], 1, sizeof(hrec.pad));
	hrec.amount = 10;
	db_recno_t key;

	memset(&kdbt, 0, sizeof(kdbt));
	memset(&ddbt, 0, sizeof(ddbt));
	kdbt.data = &key;
	kdbt.size = sizeof(u_int32_t);
	ddbt.data = &hrec;
	ddbt.size = sizeof(hrec);

	for (int i = 1; i <= nrecs; i++) {
		hrec.aid = randomId(ACCOUNT, accounts, branches, tellers);
		hrec.bid = randomId(BRANCH, accounts, branches, tellers);
		hrec.tid = randomId(TELLER, accounts, branches, tellers);

		int err;
		key = (db_recno_t)i;
		if ((err = dbp->put(dbp, NULL, &kdbt, &ddbt, DB_APPEND)) != 0) {
			_snprintf(msgString, ERR_STRING_MAX,
			    "Failure initializing history file: %s.",
			    db_strerror(err));
			return (1);
		}
	}
	return (0);
}

int
TpcbExample::run(int n)
{
	DB *adb, *bdb, *hdb, *tdb;
	int failed, ret, txns;
	DWORD start_time, end_time;
	double elapsed_secs;

	//
	// Open the database files.
	//

	int err;
	if ((err = db_create(&adb, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of account db failed. Error: %s",
		    db_strerror(err));
		return (1);
	}
	if ((err = adb->open(adb, NULL, "account", NULL, DB_UNKNOWN,
			     DB_AUTO_COMMIT, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Open of account file failed. Error: %s", db_strerror(err));
		return (1);
	}

	if ((err = db_create(&bdb, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of branch db failed. Error: %s",
		    db_strerror(err));
		return (1);
	}
	if ((err = bdb->open(bdb, NULL, "branch", NULL, DB_UNKNOWN,
			     DB_AUTO_COMMIT, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Open of branch file failed. Error: %s", db_strerror(err));
		return (1);
	}

	if ((err = db_create(&tdb, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of teller db failed. Error: %s",
		    db_strerror(err));
		return (1);
	}
	if ((err = tdb->open(tdb, NULL, "teller", NULL, DB_UNKNOWN,
			     DB_AUTO_COMMIT, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Open of teller file failed. Error: %s", db_strerror(err));
		return (1);
	}

	if ((err = db_create(&hdb, dbenv, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "db_create of teller db failed. Error: %s",
		    db_strerror(err));
		return (1);
	}
	if ((err = hdb->open(hdb, NULL, "history", NULL, DB_UNKNOWN,
			     DB_AUTO_COMMIT, 0)) != 0) {
		_snprintf(msgString, ERR_STRING_MAX,
		    "Open of history file failed. Error: %s", db_strerror(err));
		return (1);
	}

	start_time = GetTickCount();
	for (txns = n, failed = 0; n-- > 0;)
		if ((ret = txn(adb, bdb, tdb, hdb,
		    accounts, branches, tellers)) != 0)
			++failed;
	end_time = GetTickCount();
	if (end_time == start_time)
		++end_time;
#define MILLISECS_PER_SEC 1000
	elapsed_secs = (double)((end_time - start_time))/MILLISECS_PER_SEC;
	_snprintf(msgString, ERR_STRING_MAX,
		"%s: %d txns: %d failed, %.2f TPS\n", progname, txns, failed,
	    (txns - failed) / elapsed_secs);

	(void)adb->close(adb, 0);
	(void)bdb->close(bdb, 0);
	(void)tdb->close(tdb, 0);
	(void)hdb->close(hdb, 0);

	return (0);
}

//
// XXX Figure out the appropriate way to pick out IDs.
//
int
TpcbExample::txn(DB *adb, DB *bdb, DB *tdb, DB *hdb,
		 int accounts, int branches, int tellers)
{
	DBC *acurs, *bcurs, *tcurs;
	DB_TXN *t;
	DBT d_dbt, d_histdbt, k_dbt, k_histdbt;

	db_recno_t key;
	Defrec rec;
	Histrec hrec;
	int account, branch, teller, ret;

	memset(&d_dbt, 0, sizeof(d_dbt));
	memset(&d_histdbt, 0, sizeof(d_histdbt));
	memset(&k_dbt, 0, sizeof(k_dbt));
	memset(&k_histdbt, 0, sizeof(k_histdbt));
	k_histdbt.data = &key;
	k_histdbt.size = sizeof(key);

	// !!!
	// This is sample code -- we could move a lot of this into the driver
	// to make it faster.
	//
	account = randomId(ACCOUNT, accounts, branches, tellers);
	branch = randomId(BRANCH, accounts, branches, tellers);
	teller = randomId(TELLER, accounts, branches, tellers);

	k_dbt.size = sizeof(int);

	d_dbt.flags |= DB_DBT_USERMEM;
	d_dbt.data = &rec;
	d_dbt.ulen = sizeof(rec);

	hrec.aid = account;
	hrec.bid = branch;
	hrec.tid = teller;
	hrec.amount = 10;
	// Request 0 bytes since we're just positioning.
	d_histdbt.flags |= DB_DBT_PARTIAL;

	// START PER-TRANSACTION TIMING.
	//
	// Technically, TPCB requires a limit on response time, you only get
	// to count transactions that complete within 2 seconds.  That's not
	// an issue for this sample application -- regardless, here's where
	// the transaction begins.
	if (dbenv->txn_begin(dbenv, NULL, &t, 0) != 0)
		goto err;

	if (adb->cursor(adb, t, &acurs, 0) != 0 ||
	    bdb->cursor(bdb, t, &bcurs, 0) != 0 ||
	    tdb->cursor(tdb, t, &tcurs, 0) != 0)
		goto err;

	// Account record
	k_dbt.data = &account;
	if (acurs->get(acurs, &k_dbt, &d_dbt, DB_SET) != 0)
		goto err;
	rec.balance += 10;
	if (acurs->put(acurs, &k_dbt, &d_dbt, DB_CURRENT) != 0)
		goto err;

	// Branch record
	k_dbt.data = &branch;
	if (bcurs->get(bcurs, &k_dbt, &d_dbt, DB_SET) != 0)
		goto err;
	rec.balance += 10;
	if (bcurs->put(bcurs, &k_dbt, &d_dbt, DB_CURRENT) != 0)
		goto err;

	// Teller record
	k_dbt.data = &teller;
	if (tcurs->get(tcurs, &k_dbt, &d_dbt, DB_SET) != 0)
		goto err;
	rec.balance += 10;
	if (tcurs->put(tcurs, &k_dbt, &d_dbt, DB_CURRENT) != 0)
		goto err;

	// History record
	d_histdbt.flags = 0;
	d_histdbt.data = &hrec;
	d_histdbt.ulen = sizeof(hrec);
	if (hdb->put(hdb, t, &k_histdbt, &d_histdbt, DB_APPEND) != 0)
		goto err;

	if (acurs->close(acurs) != 0 || bcurs->close(bcurs) != 0
	    || tcurs->close(tcurs) != 0)
		goto err;

	ret = t->commit(t, 0);
	t = NULL;
	if (ret != 0)
		goto err;

	// END PER-TRANSACTION TIMING.
	return (0);

err:
	if (acurs != NULL)
		(void)acurs->close(acurs);
	if (bcurs != NULL)
		(void)bcurs->close(bcurs);
	if (tcurs != NULL)
		(void)tcurs->close(tcurs);
	if (t != NULL)
		(void)t->abort(t);

	return (-1);
}

// Utility functions

u_int32_t
TpcbExample::randomInt(u_int32_t lo, u_int32_t hi)
{
	u_int32_t ret;
	int t;

	t = rand();
	ret = (u_int32_t)(((double)t / ((double)(RAND_MAX) + 1)) *
			  (hi - lo + 1));
	ret += lo;
	return (ret);
}

u_int32_t
TpcbExample::randomId(FTYPE type, u_int32_t accounts,
		      u_int32_t branches, u_int32_t tellers)
{
	u_int32_t min, max, num;

	max = min = BEGID;
	num = accounts;
	switch (type) {
	case TELLER:
		min += branches;
		num = tellers;
		// Fallthrough
	case BRANCH:
		if (type == BRANCH)
			num = branches;
		min += accounts;
		// Fallthrough
	case ACCOUNT:
		max = min + num - 1;
	}
	return (randomInt(min, max));
}

char *
TpcbExample::getHomeDir(char *path, int max)
{
	memcpy(path, homeDirName, min(max, MAX_PATH));
	return path;
}

wchar_t *
TpcbExample::getHomeDirW(wchar_t *path, int max)
{
	memcpy(path, wHomeDirName, min(max, MAX_PATH)*sizeof(wchar_t));
	return path;
}

void
TpcbExample::setHomeDir(char *path)
{
	int path_len;

	path_len = strlen(path);
	strncpy(homeDirName, path, MAX_PATH);
	MultiByteToWideChar(CP_ACP, 0, path, path_len, wHomeDirName, MAX_PATH);
	wHomeDirName[path_len] = L'\0';
}

void
TpcbExample::setHomeDirW(wchar_t *path)
{
	int path_len;

	path_len = wcslen(path);
	wcsncpy(wHomeDirName, path, MAX_PATH);
	WideCharToMultiByte(CP_ACP, 0, path, path_len, homeDirName,
	    MAX_PATH, 0, 0);
	homeDirName[path_len] = '\0';
}