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authorDaniel P. Berrange <berrange@redhat.com>2015-03-18 17:25:45 +0000
committerDaniel P. Berrange <berrange@redhat.com>2015-12-18 12:18:30 +0000
commitb02db2d9203ccfd1c26e55f7d975f0c05caee0ce (patch)
tree0fda9f2f8d4c39d9c44a6fcff16f64faac4aa7ca /tests/test-io-task.c
parent1c809fa01df0c638417480dfd446415615bfd217 (diff)
io: add QIOTask class for async operations
A number of I/O operations need to be performed asynchronously to avoid blocking the main loop. The caller of such APIs need to provide a callback to be invoked on completion/error and need access to the error, if any. The small QIOTask provides a simple framework for dealing with such probes. The API docs inline provide an outline of how this is to be used. Some functions don't have the ability to run asynchronously (eg getaddrinfo always blocks), so to facilitate their use, the task class provides a mechanism to run a blocking function in a thread, while triggering the completion callback in the main event loop thread. This easily allows any synchronous function to be made asynchronous, albeit at the cost of spawning a thread. In this series, the QIOTask class will be used for things like the TLS handshake, the websockets handshake and TCP connect() progress. The concept of QIOTask is inspired by the GAsyncResult interface / GTask class in the GIO libraries. The min version requirements on glib don't allow those to be used from QEMU, so QIOTask provides a facsimilie which can be easily switched to GTask in the future if the min version is increased. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'tests/test-io-task.c')
-rw-r--r--tests/test-io-task.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/tests/test-io-task.c b/tests/test-io-task.c
new file mode 100644
index 0000000000..3344382c7f
--- /dev/null
+++ b/tests/test-io-task.c
@@ -0,0 +1,268 @@
+/*
+ * QEMU I/O task tests
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <glib.h>
+
+#include "io/task.h"
+
+#define TYPE_DUMMY "qemu:dummy"
+
+typedef struct DummyObject DummyObject;
+typedef struct DummyObjectClass DummyObjectClass;
+
+struct DummyObject {
+ Object parent;
+};
+
+struct DummyObjectClass {
+ ObjectClass parent;
+};
+
+static const TypeInfo dummy_info = {
+ .parent = TYPE_OBJECT,
+ .name = TYPE_DUMMY,
+ .instance_size = sizeof(DummyObject),
+ .class_size = sizeof(DummyObjectClass),
+};
+
+struct TestTaskData {
+ Object *source;
+ Error *err;
+ bool freed;
+};
+
+
+static void task_callback(Object *source,
+ Error *err,
+ gpointer opaque)
+{
+ struct TestTaskData *data = opaque;
+
+ data->source = source;
+ data->err = err;
+}
+
+
+static void test_task_complete(void)
+{
+ QIOTask *task;
+ Object *obj = object_new(TYPE_DUMMY);
+ Object *src;
+ struct TestTaskData data = { NULL, NULL, false };
+
+ task = qio_task_new(obj, task_callback, &data, NULL);
+ src = qio_task_get_source(task);
+
+ qio_task_complete(task);
+
+ g_assert(obj == src);
+
+ object_unref(obj);
+ object_unref(src);
+
+ g_assert(data.source == obj);
+ g_assert(data.err == NULL);
+ g_assert(data.freed == false);
+}
+
+
+static void task_data_free(gpointer opaque)
+{
+ struct TestTaskData *data = opaque;
+
+ data->freed = true;
+}
+
+
+static void test_task_data_free(void)
+{
+ QIOTask *task;
+ Object *obj = object_new(TYPE_DUMMY);
+ struct TestTaskData data = { NULL, NULL, false };
+
+ task = qio_task_new(obj, task_callback, &data, task_data_free);
+
+ qio_task_complete(task);
+
+ object_unref(obj);
+
+ g_assert(data.source == obj);
+ g_assert(data.err == NULL);
+ g_assert(data.freed == true);
+}
+
+
+static void test_task_error(void)
+{
+ QIOTask *task;
+ Object *obj = object_new(TYPE_DUMMY);
+ struct TestTaskData data = { NULL, NULL, false };
+ Error *err = NULL;
+
+ task = qio_task_new(obj, task_callback, &data, NULL);
+
+ error_setg(&err, "Some error");
+
+ qio_task_abort(task, err);
+
+ error_free(err);
+ object_unref(obj);
+
+ g_assert(data.source == obj);
+ g_assert(data.err == err);
+ g_assert(data.freed == false);
+
+}
+
+
+struct TestThreadWorkerData {
+ Object *source;
+ Error *err;
+ bool fail;
+ GThread *worker;
+ GThread *complete;
+ GMainLoop *loop;
+};
+
+static int test_task_thread_worker(QIOTask *task,
+ Error **errp,
+ gpointer opaque)
+{
+ struct TestThreadWorkerData *data = opaque;
+
+ data->worker = g_thread_self();
+
+ if (data->fail) {
+ error_setg(errp, "Testing fail");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static void test_task_thread_callback(Object *source,
+ Error *err,
+ gpointer opaque)
+{
+ struct TestThreadWorkerData *data = opaque;
+
+ data->source = source;
+ data->err = err;
+
+ data->complete = g_thread_self();
+
+ g_main_loop_quit(data->loop);
+}
+
+
+static void test_task_thread_complete(void)
+{
+ QIOTask *task;
+ Object *obj = object_new(TYPE_DUMMY);
+ struct TestThreadWorkerData data = { 0 };
+ GThread *self;
+
+ data.loop = g_main_loop_new(g_main_context_default(),
+ TRUE);
+
+ task = qio_task_new(obj,
+ test_task_thread_callback,
+ &data,
+ NULL);
+
+ qio_task_run_in_thread(task,
+ test_task_thread_worker,
+ &data,
+ NULL);
+
+ g_main_loop_run(data.loop);
+
+ g_main_loop_unref(data.loop);
+ object_unref(obj);
+
+ g_assert(data.source == obj);
+ g_assert(data.err == NULL);
+
+ self = g_thread_self();
+
+ /* Make sure the test_task_thread_worker actually got
+ * run in a different thread */
+ g_assert(data.worker != self);
+
+ /* And that the test_task_thread_callback got rnu in
+ * the main loop thread (ie this one) */
+ g_assert(data.complete == self);
+}
+
+
+static void test_task_thread_error(void)
+{
+ QIOTask *task;
+ Object *obj = object_new(TYPE_DUMMY);
+ struct TestThreadWorkerData data = { 0 };
+ GThread *self;
+
+ data.loop = g_main_loop_new(g_main_context_default(),
+ TRUE);
+ data.fail = true;
+
+ task = qio_task_new(obj,
+ test_task_thread_callback,
+ &data,
+ NULL);
+
+ qio_task_run_in_thread(task,
+ test_task_thread_worker,
+ &data,
+ NULL);
+
+ g_main_loop_run(data.loop);
+
+ g_main_loop_unref(data.loop);
+ object_unref(obj);
+
+ g_assert(data.source == obj);
+ g_assert(data.err != NULL);
+
+ self = g_thread_self();
+
+ /* Make sure the test_task_thread_worker actually got
+ * run in a different thread */
+ g_assert(data.worker != self);
+
+ /* And that the test_task_thread_callback got rnu in
+ * the main loop thread (ie this one) */
+ g_assert(data.complete == self);
+}
+
+
+int main(int argc, char **argv)
+{
+ g_test_init(&argc, &argv, NULL);
+ module_call_init(MODULE_INIT_QOM);
+ type_register_static(&dummy_info);
+ g_test_add_func("/crypto/task/complete", test_task_complete);
+ g_test_add_func("/crypto/task/datafree", test_task_data_free);
+ g_test_add_func("/crypto/task/error", test_task_error);
+ g_test_add_func("/crypto/task/thread_complete", test_task_thread_complete);
+ g_test_add_func("/crypto/task/thread_error", test_task_thread_error);
+ return g_test_run();
+}