common: compile libcommon as C++

[lttng-tools.git] / src / common / notification.cpp

diff --git a/src/common/notification.cpp b/src/common/notification.cpp
new file mode 100644 (file)
index 0000000..989c20a
--- /dev/null
+++ b/src/common/notification.cpp
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <lttng/notification/notification-internal.h>
+#include <lttng/condition/condition-internal.h>
+#include <lttng/condition/evaluation-internal.h>
+#include <lttng/condition/condition.h>
+#include <lttng/condition/evaluation.h>
+#include <lttng/trigger/trigger-internal.h>
+#include <common/payload.h>
+#include <common/payload-view.h>
+
+struct lttng_notification *lttng_notification_create(
+               struct lttng_trigger *trigger,
+               struct lttng_evaluation *evaluation)
+{
+       struct lttng_notification *notification = NULL;
+
+       if (!trigger || !evaluation) {
+               goto end;
+       }
+
+       notification = (lttng_notification *) zmalloc(sizeof(struct lttng_notification));
+       if (!notification) {
+               goto end;
+       }
+
+       notification->trigger = trigger;
+       notification->evaluation = evaluation;
+end:
+       return notification;
+}
+
+int lttng_notification_serialize(const struct lttng_notification *notification,
+               struct lttng_payload *payload)
+{
+       int ret;
+       size_t header_offset, size_before_payload;
+       struct lttng_notification_comm notification_comm = { 0 };
+       struct lttng_notification_comm *header;
+
+       header_offset = payload->buffer.size;
+       ret = lttng_dynamic_buffer_append(&payload->buffer, &notification_comm,
+                       sizeof(notification_comm));
+       if (ret) {
+               goto end;
+       }
+
+       size_before_payload = payload->buffer.size;
+       ret = lttng_trigger_serialize(notification->trigger,
+                       payload);
+       if (ret) {
+               goto end;
+       }
+
+       ret = lttng_evaluation_serialize(notification->evaluation, payload);
+       if (ret) {
+               goto end;
+       }
+
+       /* Update payload size. */
+       header = (typeof(header)) (payload->buffer.data + header_offset);
+       header->length = (uint32_t) (payload->buffer.size - size_before_payload);
+end:
+       return ret;
+
+}
+
+ssize_t lttng_notification_create_from_payload(
+               struct lttng_payload_view *src_view,
+               struct lttng_notification **notification)
+{
+       ssize_t ret, notification_size = 0, trigger_size, evaluation_size;
+       struct lttng_trigger *trigger = NULL;
+       struct lttng_evaluation *evaluation = NULL;
+       const struct lttng_notification_comm *notification_comm;
+       const struct lttng_payload_view notification_comm_view =
+                       lttng_payload_view_from_view(
+                                       src_view, 0, sizeof(*notification_comm));
+
+       if (!src_view || !notification) {
+               ret = -1;
+               goto error;
+       }
+
+       if (!lttng_payload_view_is_valid(&notification_comm_view)) {
+               /* Payload not large enough to contain the header. */
+               ret = -1;
+               goto error;
+       }
+
+       notification_comm = (typeof(notification_comm)) notification_comm_view.buffer.data;
+       notification_size += sizeof(*notification_comm);
+       {
+               /* struct lttng_condition */
+               struct lttng_payload_view condition_view =
+                               lttng_payload_view_from_view(src_view,
+                                               notification_size, -1);
+
+               trigger_size = lttng_trigger_create_from_payload(
+                               &condition_view, &trigger);
+       }
+
+       if (trigger_size < 0) {
+               ret = trigger_size;
+               goto error;
+       }
+
+       notification_size += trigger_size;
+
+       {
+               /* struct lttng_evaluation */
+               struct lttng_payload_view evaluation_view =
+                               lttng_payload_view_from_view(src_view,
+                                               notification_size, -1);
+
+               evaluation_size = lttng_evaluation_create_from_payload(
+                               lttng_trigger_get_const_condition(trigger),
+                               &evaluation_view, &evaluation);
+       }
+
+       if (evaluation_size < 0) {
+               ret = evaluation_size;
+               goto error;
+       }
+
+       notification_size += evaluation_size;
+
+       /* Unexpected size of inner-elements; the buffer is corrupted. */
+       if ((ssize_t) notification_comm->length !=
+                       trigger_size + evaluation_size) {
+               ret = -1;
+               goto error;
+       }
+
+       *notification = lttng_notification_create(trigger, evaluation);
+       if (!*notification) {
+               ret = -1;
+               goto error;
+       }
+
+       ret = notification_size;
+       return ret;
+
+error:
+       lttng_trigger_destroy(trigger);
+       lttng_evaluation_destroy(evaluation);
+       return ret;
+}
+
+void lttng_notification_destroy(struct lttng_notification *notification)
+{
+       if (!notification) {
+               return;
+       }
+
+       lttng_trigger_destroy(notification->trigger);
+       lttng_evaluation_destroy(notification->evaluation);
+       free(notification);
+}
+
+const struct lttng_condition *lttng_notification_get_condition(
+               struct lttng_notification *notification)
+{
+       return notification ? lttng_trigger_get_const_condition(notification->trigger) : NULL;
+}
+
+const struct lttng_evaluation *lttng_notification_get_evaluation(
+               struct lttng_notification *notification)
+{
+       return notification ? notification->evaluation : NULL;
+}
+
+const struct lttng_trigger *lttng_notification_get_trigger(
+               struct lttng_notification *notification)
+{
+       return notification ? notification->trigger : NULL;
+}