/* mtest.c - memory-mapped database tester/toy */
/*
 * Copyright 2011-2018 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 "lmdb.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()))

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 = 20000;
	char sval[32] = "";
	char shortkey[8], longkey[32];

		E(mdb_env_create(&env));
		E(mdb_env_set_maxreaders(env, 1));
		E(mdb_env_set_mapsize(env, 10485760));
		E(mdb_env_open(env, "./testdb", 0 /*|MDB_NOSYNC*/, 0664));

		E(mdb_txn_begin(env, NULL, 0, &txn));
		E(mdb_dbi_open(txn, NULL, 0, &dbi));
   
		key.mv_size = sizeof(shortkey);
		key.mv_data = shortkey;

		printf("Adding %d short keys\n", count);
		sprintf(sval, "short");
		data.mv_size = sizeof(sval);
		data.mv_data = sval;
	    for (i=0;i<count;i++) {	
			sprintf(shortkey, "%08d", i);
			/* Set <data> in each iteration, since MDB_NOOVERWRITE may modify it */
			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));

		key.mv_size = sizeof(longkey);
		key.mv_data = longkey;

		printf("Adding %d long keys\n", count);
		E(mdb_txn_begin(env, NULL, 0, &txn));
		sprintf(sval, "long");
		data.mv_size = sizeof(sval);
		data.mv_data = sval;

		j = 0;
	    for (i=0;i<count;i++) {	
			sprintf(longkey, "%08dlong key", i);
			/* Set <data> in each iteration, since MDB_NOOVERWRITE may modify it */
			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));

		printf("Deleting %d short keys\n", count);
		key.mv_size = sizeof(shortkey);
		key.mv_data = shortkey;
	    for (i= 0; i<count; i++) {
			txn=NULL;
			E(mdb_txn_begin(env, NULL, 0, &txn));
			sprintf(shortkey, "%08d ", i);
			if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) {
				j--;
				mdb_txn_abort(txn);
			} else {
				E(mdb_txn_commit(txn));
			}
	    }
		printf("Deleted %d values\n", i);

		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);

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

	return 0;
}