actions: introduce start session action
[lttng-tools.git] / src / common / actions / action.c
index dc72d37b4a88f75e6bf0575e16bf0c8c911435d3..bd11301cc8ba1ae0f1062b120247f7aa043958bd 100644 (file)
@@ -5,10 +5,25 @@
  *
  */
 
+#include <assert.h>
+#include <common/error.h>
 #include <lttng/action/action-internal.h>
 #include <lttng/action/notify-internal.h>
-#include <common/error.h>
-#include <assert.h>
+#include <lttng/action/start-session-internal.h>
+
+static const char *lttng_action_type_string(enum lttng_action_type action_type)
+{
+       switch (action_type) {
+       case LTTNG_ACTION_TYPE_UNKNOWN:
+               return "UNKNOWN";
+       case LTTNG_ACTION_TYPE_NOTIFY:
+               return "NOTIFY";
+       case LTTNG_ACTION_TYPE_START_SESSION:
+               return "START_SESSION";
+       default:
+               return "???";
+       }
+}
 
 enum lttng_action_type lttng_action_get_type(struct lttng_action *action)
 {
@@ -22,6 +37,22 @@ enum lttng_action_type lttng_action_get_type_const(
        return action->type;
 }
 
+LTTNG_HIDDEN
+void lttng_action_init(
+               struct lttng_action *action,
+               enum lttng_action_type type,
+               action_validate_cb validate,
+               action_serialize_cb serialize,
+               action_equal_cb equal,
+               action_destroy_cb destroy)
+{
+       action->type = type;
+       action->validate = validate;
+       action->serialize = serialize;
+       action->equal = equal;
+       action->destroy = destroy;
+}
+
 void lttng_action_destroy(struct lttng_action *action)
 {
        if (!action) {
@@ -78,34 +109,83 @@ end:
 
 LTTNG_HIDDEN
 ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view,
-               struct lttng_action **_action)
+               struct lttng_action **action)
 {
-       ssize_t ret, action_size = sizeof(struct lttng_action_comm);
-       struct lttng_action *action;
+       ssize_t consumed_len, specific_action_consumed_len;
        const struct lttng_action_comm *action_comm;
+       action_create_from_buffer_cb create_from_buffer_cb;
+       struct lttng_buffer_view specific_action_view;
 
-       if (!view || !_action) {
-               ret = -1;
+       if (!view || !action) {
+               consumed_len = -1;
                goto end;
        }
 
        action_comm = (const struct lttng_action_comm *) view->data;
-       DBG("Deserializing action from buffer");
+
+       DBG("Create action from buffer: action-type=%s",
+                       lttng_action_type_string(action_comm->action_type));
+
        switch (action_comm->action_type) {
        case LTTNG_ACTION_TYPE_NOTIFY:
-               action = lttng_action_notify_create();
+               create_from_buffer_cb = lttng_action_notify_create_from_buffer;
+               break;
+       case LTTNG_ACTION_TYPE_START_SESSION:
+               create_from_buffer_cb =
+                               lttng_action_start_session_create_from_buffer;
                break;
        default:
-               ret = -1;
+               ERR("Failed to create action from buffer, unhandled action type: action-type=%u (%s)",
+                               action_comm->action_type,
+                               lttng_action_type_string(
+                                               action_comm->action_type));
+               consumed_len = -1;
                goto end;
        }
 
-       if (!action) {
-               ret = -1;
+       /* Create buffer view for the action-type-specific data. */
+       specific_action_view = lttng_buffer_view_from_view(view,
+                       sizeof(struct lttng_action_comm),
+                       view->size - sizeof(struct lttng_action_comm));
+
+       specific_action_consumed_len =
+                       create_from_buffer_cb(&specific_action_view, action);
+       if (specific_action_consumed_len < 0) {
+               ERR("Failed to create specific action from buffer.");
+               consumed_len = -1;
                goto end;
        }
-       ret = action_size;
-       *_action = action;
+
+       assert(*action);
+
+       consumed_len = sizeof(struct lttng_action_comm) +
+                      specific_action_consumed_len;
+
 end:
-       return ret;
+       return consumed_len;
+}
+
+LTTNG_HIDDEN
+bool lttng_action_is_equal(const struct lttng_action *a,
+               const struct lttng_action *b)
+{
+       bool is_equal = false;
+
+       if (!a || !b) {
+               goto end;
+       }
+
+       if (a->type != b->type) {
+               goto end;
+       }
+
+       if (a == b) {
+               is_equal = true;
+               goto end;
+       }
+
+       assert(a->equal);
+       is_equal = a->equal(a, b);
+end:
+       return is_equal;
 }
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