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/* GLib testing framework examples and tests
* Copyright (C) 2009 Red Hat, Inc.
*
* SPDX-License-Identifier: LicenseRef-old-glib-tests
*
* This work is provided "as is"; redistribution and modification
* in whole or in part, in any medium, physical or electronic is
* permitted without restriction.
*
* This work 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.
*
* In no event shall the authors or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*/
#include <glib/glib.h>
#include <gio/gio.h>
#include <stdlib.h>
#include <string.h>
#define NUM_TRIALS 250000
struct {
const char *order;
int expected, seen;
} ordering[] = {
/* There are 32 legitimate orderings; the result always has to start
* with either "fe" (usually) or "ef" (rarely). For the remaining
* letters, "cbda" is the most likely, with various other orders
* possible, down to "adbc" being the most improbable. However,
* almost all "fe" orderings are more likely than almost any "ef"
* orderings. The complete probability ordering, from most-likely
* to least-likely is something roughly like:
*/
{ "fecbda", 0.2468 * NUM_TRIALS, 0},
{ "febcda", 0.1885 * NUM_TRIALS, 0},
{ "fecdba", 0.1346 * NUM_TRIALS, 0},
{ "fedcba", 0.0830 * NUM_TRIALS, 0},
{ "febdca", 0.0706 * NUM_TRIALS, 0},
{ "fedbca", 0.0571 * NUM_TRIALS, 0},
{ "fecbad", 0.0496 * NUM_TRIALS, 0},
{ "febcad", 0.0374 * NUM_TRIALS, 0},
{ "fecabd", 0.0185 * NUM_TRIALS, 0},
{ "fecdab", 0.0136 * NUM_TRIALS, 0},
{ "fecadb", 0.0110 * NUM_TRIALS, 0},
{ "febacd", 0.0108 * NUM_TRIALS, 0},
{ "feacbd", 0.0096 * NUM_TRIALS, 0},
{ "fedcab", 0.0083 * NUM_TRIALS, 0},
{ "feabcd", 0.0073 * NUM_TRIALS, 0},
{ "feacdb", 0.0058 * NUM_TRIALS, 0},
{ "efcbda", 0.0049 * NUM_TRIALS, 0},
{ "febdac", 0.0048 * NUM_TRIALS, 0},
{ "febadc", 0.0043 * NUM_TRIALS, 0},
{ "fedbac", 0.0038 * NUM_TRIALS, 0},
{ "efbcda", 0.0038 * NUM_TRIALS, 0},
{ "feadcb", 0.0036 * NUM_TRIALS, 0},
{ "fedacb", 0.0035 * NUM_TRIALS, 0},
{ "feabdc", 0.0029 * NUM_TRIALS, 0},
{ "feadbc", 0.0026 * NUM_TRIALS, 0},
{ "fedabc", 0.0026 * NUM_TRIALS, 0},
{ "efcdba", 0.0026 * NUM_TRIALS, 0},
{ "efdcba", 0.0017 * NUM_TRIALS, 0},
{ "efbdca", 0.0014 * NUM_TRIALS, 0},
{ "efdbca", 0.0011 * NUM_TRIALS, 0},
{ "efcbad", 0.0010 * NUM_TRIALS, 0},
{ "efbcad", 0.0008 * NUM_TRIALS, 0},
{ "efcabd", 0.0004 * NUM_TRIALS, 0},
{ "efcdab", 0.0003 * NUM_TRIALS, 0},
{ "efcadb", 0.0002 * NUM_TRIALS, 0},
{ "efbacd", 0.0002 * NUM_TRIALS, 0},
{ "efacbd", 0.0002 * NUM_TRIALS, 0},
{ "efdcab", 0.0002 * NUM_TRIALS, 0},
{ "efabcd", 0.0002 * NUM_TRIALS, 0},
{ "efacdb", 0.0001 * NUM_TRIALS, 0},
{ "efbdac", 0.0001 * NUM_TRIALS, 0},
{ "efadcb", 0.0001 * NUM_TRIALS, 0},
{ "efdbac", 0.0001 * NUM_TRIALS, 0},
{ "efbadc", 0.0001 * NUM_TRIALS, 0},
{ "efdacb", 0.0001 * NUM_TRIALS, 0},
{ "efabdc", 0.0001 * NUM_TRIALS, 0},
{ "efadbc", 0.00005 * NUM_TRIALS, 0},
{ "efdabc", 0.00005 * NUM_TRIALS, 0}
};
#define NUM_ORDERINGS G_N_ELEMENTS (ordering)
static void
test_srv_target_ordering (void)
{
GList *targets, *sorted, *t;
char result[7], *p;
int i;
guint o;
targets = NULL;
/* name, port, priority, weight */
targets = g_list_append (targets, g_srv_target_new ("a", 0, 2, 0));
targets = g_list_append (targets, g_srv_target_new ("b", 0, 2, 10));
targets = g_list_append (targets, g_srv_target_new ("c", 0, 2, 15));
targets = g_list_append (targets, g_srv_target_new ("d", 0, 2, 5));
targets = g_list_append (targets, g_srv_target_new ("e", 0, 1, 0));
targets = g_list_append (targets, g_srv_target_new ("f", 0, 1, 50));
for (i = 0; i < NUM_TRIALS; i++)
{
g_random_set_seed (i);
sorted = g_srv_target_list_sort (g_list_copy (targets));
for (t = sorted, p = result; t; t = t->next)
*(p++) = *g_srv_target_get_hostname (t->data);
*p = '\0';
g_list_free (sorted);
for (o = 0; o < NUM_ORDERINGS; o++)
{
if (!strcmp (result, ordering[o].order))
{
ordering[o].seen++;
break;
}
}
/* Assert that @result matched one of the valid orderings */
if (o == NUM_ORDERINGS)
{
char *msg = g_strdup_printf ("result '%s' is invalid", result);
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, msg);
}
}
/* Assert that each ordering appeared roughly the expected
* number of times.
*/
for (o = 0; o < NUM_ORDERINGS; o++)
{
g_assert_cmpint (ordering[o].seen, >, ordering[o].expected / 2);
g_assert_cmpint (ordering[o].seen, <, ordering[o].expected * 2);
}
g_resolver_free_targets (targets);
}
int
main (int argc, char **argv)
{
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/srvtarget/srv-target-ordering", test_srv_target_ordering);
return g_test_run();
}
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