/* mtest.c - memory-mapped database tester/toy */

/*
 * Copyright (c) 2015,2016 Leonid Yuriev <leo@yuriev.ru>.
 * Copyright (c) 2015,2016 Peter-Service R&D LLC.
 * Copyright 2011-2016 Howard Chu, Symas Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include "mdbx.h"

#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
	"%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))

#ifndef DBPATH
#	define DBPATH "./testdb"
#endif

int main(int argc,char * argv[])
{
	int i = 0, j = 0, rc;
	MDB_env *env;
	MDB_dbi dbi;
	MDB_val key, data;
	MDB_txn *txn;
	MDB_stat mst;
	MDB_cursor *cursor, *cur2;
	MDB_cursor_op op;
	int count;
	int *values;
	char sval[32] = "";
	int env_oflags;
	struct stat db_stat, exe_stat;

	(void) argc;
	(void) argv;
	srand(time(NULL));

	count = (rand()%384) + 64;
	values = (int *)malloc(count*sizeof(int));

	for(i = 0;i<count;i++) {
		values[i] = rand()%1024;
	}

	E(mdb_env_create(&env));
	E(mdb_env_set_maxreaders(env, 1));
	E(mdb_env_set_mapsize(env, 10485760));

	E(stat("/proc/self/exe", &exe_stat)?errno:0);
	E(stat(DBPATH "/.", &db_stat)?errno:0);
	env_oflags = MDB_FIXEDMAP | MDB_NOSYNC;
	if (major(db_stat.st_dev) != major(exe_stat.st_dev)) {
		/* LY: Assume running inside a CI-environment:
		 *  1) don't use FIXEDMAP to avoid EBUSY in case collision,
		 *     which could be inspired by address space randomisation feature.
		 *  2) drop MDB_NOSYNC expecting that DBPATH is at a tmpfs or some dedicated storage.
		 */
		env_oflags = 0;
	}
	E(mdb_env_open(env, DBPATH, env_oflags, 0664));

	E(mdb_txn_begin(env, NULL, 0, &txn));
	E(mdb_dbi_open(txn, NULL, 0, &dbi));

	key.mv_size = sizeof(int);
	key.mv_data = sval;

	printf("Adding %d values\n", count);
	for (i=0;i<count;i++) {
		sprintf(sval, "%03x %d foo bar", values[i], values[i]);
		/* Set <data> in each iteration, since MDB_NOOVERWRITE may modify it */
		data.mv_size = sizeof(sval);
		data.mv_data = sval;
		if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE))) {
			j++;
			data.mv_size = sizeof(sval);
			data.mv_data = sval;
		}
	}
	if (j) printf("%d duplicates skipped\n", j);
	E(mdb_txn_commit(txn));
	E(mdb_env_stat(env, &mst));

	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
	E(mdb_cursor_open(txn, dbi, &cursor));
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
		printf("key: %p %.*s, data: %p %.*s\n",
			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
	}
	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
	mdb_cursor_close(cursor);
	mdb_txn_abort(txn);

	j=0;
	key.mv_data = sval;
	for (i= count - 1; i > -1; i-= (rand()%5)) {
		j++;
		txn=NULL;
		E(mdb_txn_begin(env, NULL, 0, &txn));
		sprintf(sval, "%03x ", values[i]);
		if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) {
			j--;
			mdb_txn_abort(txn);
		} else {
			E(mdb_txn_commit(txn));
		}
	}
	free(values);
	printf("Deleted %d values\n", j);

	E(mdb_env_stat(env, &mst));
	E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
	E(mdb_cursor_open(txn, dbi, &cursor));
	printf("Cursor next\n");
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	}
	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
	printf("Cursor last\n");
	E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
	printf("key: %.*s, data: %.*s\n",
		(int) key.mv_size,  (char *) key.mv_data,
		(int) data.mv_size, (char *) data.mv_data);
	printf("Cursor prev\n");
	while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	}
	CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
	printf("Cursor last/prev\n");
	E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);
	E(mdb_cursor_get(cursor, &key, &data, MDB_PREV));
		printf("key: %.*s, data: %.*s\n",
			(int) key.mv_size,  (char *) key.mv_data,
			(int) data.mv_size, (char *) data.mv_data);

	mdb_cursor_close(cursor);
	mdb_txn_abort(txn);

	printf("Deleting with cursor\n");
	E(mdb_txn_begin(env, NULL, 0, &txn));
	E(mdb_cursor_open(txn, dbi, &cur2));
	for (i=0; i<50; i++) {
		if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, MDB_NEXT)))
			break;
		printf("key: %p %.*s, data: %p %.*s\n",
			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
		E(mdb_del(txn, dbi, &key, NULL));
	}

	printf("Restarting cursor in txn\n");
	for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
		if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, op)))
			break;
		printf("key: %p %.*s, data: %p %.*s\n",
			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
	}
	mdb_cursor_close(cur2);
	E(mdb_txn_commit(txn));

	printf("Restarting cursor outside txn\n");
	E(mdb_txn_begin(env, NULL, 0, &txn));
	E(mdb_cursor_open(txn, dbi, &cursor));
	for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
		if (RES(MDB_NOTFOUND, mdb_cursor_get(cursor, &key, &data, op)))
			break;
		printf("key: %p %.*s, data: %p %.*s\n",
			key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
			data.mv_data, (int) data.mv_size, (char *) data.mv_data);
	}
	mdb_cursor_close(cursor);
	mdb_txn_abort(txn);

	mdb_dbi_close(env, dbi);
	mdb_env_close(env);

	return 0;
}