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device: Add API for perstistent data storage

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API consumers should fetch the persistent data when they are done and
store it to disk. It is undefined when this data is updated by the
driver, but in general, it should only be updated once the first time
a device is used.
This commit is contained in:
Benjamin Berg
2022-07-11 19:41:43 +02:00
parent 24e7e1f100
commit afa37cbcbf
5 changed files with 220 additions and 0 deletions
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48
tests/test-fp-device.c
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@@ -232,6 +232,53 @@ test_device_has_storage (void)
G_GNUC_END_IGNORE_DEPRECATIONS
}
static void
test_device_persistent_data (void)
{
g_autoptr(FptContext) tctx = fpt_context_new_with_virtual_device (FPT_VIRTUAL_DEVICE_IMAGE);
g_autoptr(GVariant) initial = NULL;
g_autoptr(GVariant) loaded = NULL;
g_autoptr(GError) error = NULL;
guint8 *data = (guint8 *) 0xdeadbeef;
gsize length = 1;
initial = g_variant_ref_sink (g_variant_new ("(s)", "stored data"));
g_assert_true (fp_device_get_persistent_data (tctx->device, &data, &length, &error));
g_assert_cmpint (length, ==, 0);
g_assert_null (data);
g_assert_no_error (error);
/* Use the fact that this is a property that we can poke from the outside. */
g_object_set (tctx->device, "fpi-persistent-data", initial, NULL);
/* Works now */
g_assert_true (fp_device_get_persistent_data (tctx->device, &data, &length, &error));
g_assert_cmpint (length, !=, 0);
g_assert_nonnull (data);
g_assert_no_error (error);
/* We can't load the data, as data has been set already. */
g_assert_false (fp_device_set_persistent_data (tctx->device, data, length, &error));
g_assert_error (error, G_IO_ERROR, G_IO_ERROR_EXISTS);
g_clear_pointer (&error, g_error_free);
/* Abuse that we can "load" again if the data is set to NULL.
* This is an implementation detail and just a lack of error checking. */
g_object_set (tctx->device, "fpi-persistent-data", NULL, NULL);
/* Incomplete data, causes parsing error */
g_assert_false (fp_device_set_persistent_data (tctx->device, data, 5, &error));
g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA);
g_clear_pointer (&error, g_error_free);
g_assert_true (fp_device_set_persistent_data (tctx->device, data, length, &error));
g_assert_no_error (error);
g_object_get (tctx->device, "fpi-persistent-data", &loaded, NULL);
g_assert_cmpvariant (initial, loaded);
}
int
main (int argc, char *argv[])
{
@@ -252,6 +299,7 @@ main (int argc, char *argv[])
g_test_add_func ("/device/sync/supports_identify", test_device_supports_identify);
g_test_add_func ("/device/sync/supports_capture", test_device_supports_capture);
g_test_add_func ("/device/sync/has_storage", test_device_has_storage);
g_test_add_func ("/device/persistent_data", test_device_persistent_data);
return g_test_run ();
}