From 8760833820e03a21900afda2d2f5785610c59ac9 Mon Sep 17 00:00:00 2001
From: Daniel Playfair Cal <daniel.playfair.cal@gmail.com>
Date: Sat, 28 Jul 2018 13:38:00 +1000
Subject: [PATCH 5/5] Engine: Add comprehensive unit tests for subscription
counting behaviour
Use g_assert_false instead of g_assert in unit tests
---
tests/engine.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 206 insertions(+)
diff --git a/tests/engine.c b/tests/engine.c
index 038c04c..f2e57b2 100644
--- a/tests/engine.c
+++ b/tests/engine.c
@@ -1232,6 +1232,185 @@ test_watch_fast (void)
g_variant_unref (triv);
}
+static void
+test_watch_fast_simultaneous_subscriptions (void)
+{
+ /**
+ * Test that creating multiple subscriptions to the same path
+ * simultaneously (before receiving replies from D-Bus) only results in
+ * a single D-Bus match rule, and that it is removed at the right time.
+ */
+ DConfEngine *engine;
+ GvdbTable *table;
+ GVariant *triv;
+
+ /* Set up */
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/HOME/.config/dconf/user", table);
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/etc/dconf/db/site", table);
+
+ triv = g_variant_ref_sink (g_variant_new ("()"));
+
+ change_log = g_string_new (NULL);
+
+ engine = dconf_engine_new (SRCDIR "/profile/dos", NULL, NULL);
+
+
+ /* Subscribe to the same path 3 times. Both AddMatch results succeed
+ * (one for each source). There is only one for each source*path.
+ */
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_engine_watch_fast (engine, "/a/b/c");
+
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_assert_no_async ();
+
+ /* Unsubscribe twice, after the AddMatch succeeds. There is still one
+ * active subscription, so no RemoveMatch request is sent. */
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+
+ dconf_mock_dbus_assert_no_async ();
+
+ /* Unsubscribe once more. The number of active subscriptions falls to 0
+ * and the D-Bus match rule is removed */
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_assert_no_async ();
+
+ /* The shm was not flagged at any point - so no change notifications
+ * should not have been sent */
+ g_assert_cmpstr (change_log->str, ==, "");
+
+ /* Clean up */
+ dconf_engine_unref (engine);
+ g_string_free (change_log, TRUE);
+ change_log = NULL;
+ g_variant_unref (triv);
+}
+
+static void
+test_watch_fast_successive_subscriptions (void)
+{
+ /**
+ * Test that subscribing to the same path multiple times successively
+ * (after waiting for any expected replies from D-Bus) results in only
+ * a single D-Bus match rule being created, and that it is created and
+ * destroyed at the right times.
+ */
+ DConfEngine *engine;
+ GvdbTable *table;
+ GVariant *triv;
+
+ /* Set up */
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/HOME/.config/dconf/user", table);
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/etc/dconf/db/site", table);
+
+ triv = g_variant_ref_sink (g_variant_new ("()"));
+
+ change_log = g_string_new (NULL);
+
+ engine = dconf_engine_new (SRCDIR "/profile/dos", NULL, NULL);
+
+ /* Subscribe to a path, and simulate a change to the database while the
+ * AddMatch request is in progress */
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_mock_shm_flag ("user");
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+
+ /* When the AddMatch requests succeeds, expect a change notification
+ * for the path */
+ dconf_mock_dbus_assert_no_async ();
+ g_assert_cmpstr (change_log->str, ==, "/a/b/c:1::nil;");
+
+ /* Subscribe to a path twice again, and simulate a change to the
+ * database */
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_mock_shm_flag ("user");
+
+ /* There was already a match rule in place, so there should be no D-Bus
+ * requests and no change notifications */
+ dconf_mock_dbus_assert_no_async ();
+ g_assert_cmpstr (change_log->str, ==, "/a/b/c:1::nil;");
+
+ /* Unsubscribe */
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_mock_dbus_assert_no_async ();
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_assert_no_async ();
+
+
+ /* Clean up */
+ dconf_engine_unref (engine);
+ g_string_free (change_log, TRUE);
+ change_log = NULL;
+ g_variant_unref (triv);
+}
+
+static void
+test_watch_fast_short_lived_subscriptions (void)
+{
+ /**
+ * Test that subscribing and then immediately unsubscribing (without
+ * waiting for replies from D-Bus) multiple times to the same path
+ * correctly triggers D-Bus requests and change notifications in cases
+ * where the D-Bus match rule was not in place when the database was
+ * changed.
+ */
+ DConfEngine *engine;
+ GvdbTable *table;
+ GVariant *triv;
+
+ /* Set up */
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/HOME/.config/dconf/user", table);
+ table = dconf_mock_gvdb_table_new ();
+ dconf_mock_gvdb_install ("/etc/dconf/db/site", table);
+
+ triv = g_variant_ref_sink (g_variant_new ("()"));
+
+ change_log = g_string_new (NULL);
+
+ engine = dconf_engine_new (SRCDIR "/profile/dos", NULL, NULL);
+
+ /* Subscribe to a path twice, and simulate a change to the database
+ * while the AddMatch request is in progress */
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_engine_watch_fast (engine, "/a/b/c");
+ dconf_mock_shm_flag ("user");
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_engine_unwatch_fast (engine, "/a/b/c");
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_async_reply (triv, NULL);
+ dconf_mock_dbus_assert_no_async ();
+
+ /* When the AddMatch requests succeed, expect a change notification
+ * to have been sent for the path, even though the client has since
+ * unsubscribed. */
+ g_assert_cmpstr (change_log->str, ==, "/a/b/c:1::nil;");
+
+
+ /* Clean up */
+ dconf_engine_unref (engine);
+ g_string_free (change_log, TRUE);
+ change_log = NULL;
+ g_variant_unref (triv);
+}
+
static const gchar *match_request_type;
static gboolean got_match_request[5];
@@ -1270,13 +1449,37 @@ test_watch_sync (void)
engine = dconf_engine_new (SRCDIR "/profile/dos", NULL, NULL);
match_request_type = "AddMatch";
+
+ /* A match rule should be added when the first subscription is established */
dconf_engine_watch_sync (engine, "/a/b/c");
g_assert (got_match_request[G_BUS_TYPE_SESSION]);
g_assert (got_match_request[G_BUS_TYPE_SYSTEM]);
got_match_request[G_BUS_TYPE_SESSION] = FALSE;
got_match_request[G_BUS_TYPE_SYSTEM] = FALSE;
+ /* The match rule is now already in place, so more are not needed */
+ dconf_engine_watch_sync (engine, "/a/b/c");
+ g_assert_false (got_match_request[G_BUS_TYPE_SESSION]);
+ g_assert_false (got_match_request[G_BUS_TYPE_SYSTEM]);
+
+ dconf_engine_watch_sync (engine, "/a/b/c");
+ g_assert_false (got_match_request[G_BUS_TYPE_SESSION]);
+ g_assert_false (got_match_request[G_BUS_TYPE_SYSTEM]);
+
match_request_type = "RemoveMatch";
+
+ /* There are 3 subscriptions, so removing 2 should not remove
+ * the match rule */
+ dconf_engine_unwatch_sync (engine, "/a/b/c");
+ g_assert_false (got_match_request[G_BUS_TYPE_SESSION]);
+ g_assert_false (got_match_request[G_BUS_TYPE_SYSTEM]);
+
+ dconf_engine_unwatch_sync (engine, "/a/b/c");
+ g_assert_false (got_match_request[G_BUS_TYPE_SESSION]);
+ g_assert_false (got_match_request[G_BUS_TYPE_SYSTEM]);
+
+ /* The match rule should be removed when the last subscription is
+ * removed */
dconf_engine_unwatch_sync (engine, "/a/b/c");
g_assert (got_match_request[G_BUS_TYPE_SESSION]);
g_assert (got_match_request[G_BUS_TYPE_SYSTEM]);
@@ -1773,6 +1976,9 @@ main (int argc, char **argv)
g_test_add_func ("/engine/sources/service", test_service_source);
g_test_add_func ("/engine/read", test_read);
g_test_add_func ("/engine/watch/fast", test_watch_fast);
+ g_test_add_func ("/engine/watch/fast/simultaneous", test_watch_fast_simultaneous_subscriptions);
+ g_test_add_func ("/engine/watch/fast/successive", test_watch_fast_successive_subscriptions);
+ g_test_add_func ("/engine/watch/fast/short_lived", test_watch_fast_short_lived_subscriptions);
g_test_add_func ("/engine/watch/sync", test_watch_sync);
g_test_add_func ("/engine/change/fast", test_change_fast);
g_test_add_func ("/engine/change/sync", test_change_sync);
--
2.20.1