vici: Add function to test if an event should be generated

Useful to avoid generating vici messages if they are not needed and their
generation is heavy operation.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>

diff --git a/src/libcharon/plugins/vici/vici_dispatcher.c b/src/libcharon/plugins/vici/vici_dispatcher.c
index 6db36fbe004c5d76ebe603fbad9277f430477b99..31292d6b3ff0933ada62b1708ee991cb06af4f48 100644 (file)
--- a/src/libcharon/plugins/vici/vici_dispatcher.c
+++ b/src/libcharon/plugins/vici/vici_dispatcher.c
@@ -13,6 +13,28 @@
  * for more details.
  */
 
+/*
+ * Copyright (C) 2014 Timo Teräs <timo.teras@iki.fi>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
 #include "vici_dispatcher.h"
 #include "vici_socket.h"
 
@@ -446,6 +468,24 @@ METHOD(vici_dispatcher_t, manage_event, void,
        this->mutex->unlock(this->mutex);
 }
 
+METHOD(vici_dispatcher_t, has_event_listeners, bool,
+       private_vici_dispatcher_t *this, char *name)
+{
+       bool retval = FALSE;
+
+       this->mutex->lock(this->mutex);
+       if (this->events->get(this->events, name))
+       {
+               /* the entry might be getting destroyed, but returning
+                * false positive is not a problem as a later raise_event
+                * will check things again. */
+               retval = TRUE;
+       }
+       this->mutex->unlock(this->mutex);
+
+       return retval;
+}
+
 METHOD(vici_dispatcher_t, raise_event, void,
        private_vici_dispatcher_t *this, char *name, u_int id,
        vici_message_t *message)
@@ -504,6 +544,7 @@ vici_dispatcher_t *vici_dispatcher_create(char *uri)
                .public = {
                        .manage_command = _manage_command,
                        .manage_event = _manage_event,
+                       .has_event_listeners = _has_event_listeners,
                        .raise_event = _raise_event,
                        .destroy = _destroy,
                },

diff --git a/src/libcharon/plugins/vici/vici_dispatcher.h b/src/libcharon/plugins/vici/vici_dispatcher.h
index 2297a80bd2ca4b1c57fb8d67c7d7a1cddb0264ab..e48cf3bd17968a17b8692413a16c0c9f0265e6dd 100644 (file)
--- a/src/libcharon/plugins/vici/vici_dispatcher.h
+++ b/src/libcharon/plugins/vici/vici_dispatcher.h
@@ -13,6 +13,28 @@
  * for more details.
  */
 
+/*
+ * Copyright (C) 2014 Timo Teräs <timo.teras@iki.fi>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
 /**
  * @defgroup vici_dispatcher vici_dispatcher
  * @{ @ingroup vici
@@ -95,6 +117,17 @@ struct vici_dispatcher_t {
         */
        void (*manage_event)(vici_dispatcher_t *this, char *name, bool reg);
 
+       /**
+        * Check if an event has listeners.
+        *
+        * This can be used to check if a vici message needs to be generated or not,
+        * as in some cases the generation can be a heavy operation.
+        *
+        * @param name                  event name to check
+        * @return                              TRUE if event has listeners
+        */
+       bool (*has_event_listeners)(vici_dispatcher_t *this, char *name);
+
        /**
         * Raise an event to a specific or all clients registered to that event.
         *