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device: Prefer older prints when garbage collecting

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This makes garbage collection a bit more predictable overall. Note that
we'll first delete prints that we do not know the age of.

If we cannot sort them by age, then randomize the order so that we don't
end up deleting in the order that the device returned the prints.
This commit is contained in:
Benjamin Berg
2021-01-07 14:03:50 +01:00
parent 6fd1aa51cd
commit 00fbf19079
1 changed files with 48 additions and 0 deletions
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48
src/device.c
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@ -1445,6 +1445,50 @@ enroll_progress_cb (FpDevice *dev,
g_signal_emit (rdev, signals[SIGNAL_ENROLL_STATUS], 0, name, FALSE);
}
static gint
garbage_collect_sort (gconstpointer a, gconstpointer b)
{
/* Prefer */
FpPrint *print_a = *((FpPrint **) a);
FpPrint *print_b = *((FpPrint **) b);
const GDate *date_a, *date_b;
guint32 julian_a = 0;
guint32 julian_b = 0;
gint32 rand_a, rand_b;
date_a = fp_print_get_enroll_date (print_a);
date_b = fp_print_get_enroll_date (print_b);
if (date_a && g_date_valid (date_a))
julian_a = g_date_get_julian (date_a);
if (date_b && g_date_valid (date_b))
julian_b = g_date_get_julian (date_b);
/* Sort older prints first. */
if (julian_a != julian_b)
return julian_b - julian_a;
/* Randomize the order,
* do so by sorting on a random number we assign to each print.
* Not nice, but gets the job done.
*/
rand_a = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (print_a), "sort-rand"));
rand_b = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (print_b), "sort-rand"));
if (rand_a == 0)
{
rand_a = g_random_int_range (1, G_MAXINT32);
g_object_set_data (G_OBJECT (print_a), "sort-rand", GINT_TO_POINTER (rand_a));
}
if (rand_b == 0)
{
rand_b = g_random_int_range (1, G_MAXINT32);
g_object_set_data (G_OBJECT (print_b), "sort-rand", GINT_TO_POINTER (rand_b));
}
return rand_b - rand_a;
}
static gboolean
try_delete_print (FprintDevice *rdev)
{
@ -1462,6 +1506,10 @@ try_delete_print (FprintDevice *rdev)
g_debug ("Device has %d prints stored", device_prints->len);
/* Sort in order of preferred garbage collection.
* With randomization if we can't sort them. */
g_ptr_array_sort (device_prints, garbage_collect_sort);
users = store.discover_users ();
for (user = users; user; user = user->next)