Add client notification API

[lttng-tools.git] / src / common / action.c

diff --git a/src/common/action.c b/src/common/action.c
new file mode 100644 (file)
index 0000000..3abdfaf
--- /dev/null
+++ b/src/common/action.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * 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, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <lttng/action/action-internal.h>
+#include <lttng/action/notify-internal.h>
+#include <common/error.h>
+#include <assert.h>
+
+enum lttng_action_type lttng_action_get_type(struct lttng_action *action)
+{
+       return action ? action->type : LTTNG_ACTION_TYPE_UNKNOWN;
+}
+
+void lttng_action_destroy(struct lttng_action *action)
+{
+       if (!action) {
+               return;
+       }
+
+       assert(action->destroy);
+       action->destroy(action);
+}
+
+LTTNG_HIDDEN
+bool lttng_action_validate(struct lttng_action *action)
+{
+       bool valid;
+
+       if (!action) {
+               valid = false;
+               goto end;
+       }
+
+       if (!action->validate) {
+               /* Sub-class guarantees that it can never be invalid. */
+               valid = true;
+               goto end;
+       }
+
+       valid = action->validate(action);
+end:
+       return valid;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_action_serialize(struct lttng_action *action, char *buf)
+{
+       ssize_t ret, action_size;
+       struct lttng_action_comm action_comm;
+
+       if (!action) {
+               ret = -1;
+               goto end;
+       }
+
+       action_comm.action_type = (int8_t) action->type;
+       ret = sizeof(struct lttng_action_comm);
+       if (buf) {
+               memcpy(buf, &action_comm, ret);
+               buf += ret;
+       }
+
+       action_size = action->serialize(action, buf);
+       if (action_size < 0) {
+               ret = action_size;
+               goto end;
+       }
+       ret += action_size;
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view,
+               struct lttng_action **_action)
+{
+       ssize_t ret, action_size = sizeof(struct lttng_action_comm);
+       struct lttng_action *action;
+       const struct lttng_action_comm *action_comm;
+
+       if (!view || !_action) {
+               ret = -1;
+               goto end;
+       }
+
+       action_comm = (const struct lttng_action_comm *) view->data;
+       DBG("Deserializing action from buffer");
+       switch (action_comm->action_type) {
+       case LTTNG_ACTION_TYPE_NOTIFY:
+               action = lttng_action_notify_create();
+               break;
+       default:
+               ret = -1;
+               goto end;
+       }
+
+       if (!action) {
+               ret = -1;
+               goto end;
+       }
+       ret = action_size;
+       *_action = action;
+end:
+       return ret;
+}