add: faster broadcast on status change

src/main.c

@@ -1,7 +1,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
-#include <time.h>
 #include <syslog.h>
 
 #include <mongoose.h>
@@ -142,16 +141,10 @@ main(int argc, const char** argv)
 
     /******************** START MAIN LOOP ********************/
 
-    time_t timer = time(NULL);
-
     for (;;)
     {
         mg_mgr_poll(&mgr, 200);
-        if(time(NULL) - timer >= 10)
+        status_broadcast(&mgr);
-        {
-            status_broadcast(&mgr);
-            timer = time(NULL);
-        }
     }
 
     terminate(0);

src/status.c

@@ -1,3 +1,5 @@
+#include <time.h>
+
 #include <cJSON.h>
 
 #include <cache.h>
@@ -8,56 +10,7 @@ relay_t **global_relay_status_list;
 char *relay_status_list_json_str;
 size_t relay_status_list_json_str_len;
 
-void
+time_t timer;
-status_init()
-{
-    global_relay_status_list = relay_get_all();
-    relay_status_list_json_str = NULL;
-    relay_status_list_json_str_len = 0;
-}
-
-void
-status_reload_entry(int relay_id)
-{
-    LOGGER_DEBUG("reloading relay status\n");
-    relay_t **relays = global_relay_status_list;
-    for(int i = 0; relays[i] != NULL; ++i)
-    {
-        if(relays[i]->id != relay_id)
-        {
-            continue;
-        }
-
-        int is_on_backup = relays[i]->is_on;
-        relay_t *updated_relay = relay_get_by_id(relay_id);
-        relay_free(relays[i]);
-        relays[i] = updated_relay;
-        relays[i]->is_on = is_on_backup;
-        relay_status_list_json_str = NULL;
-        relay_status_list_json_str_len = 0;
-
-        cache_invalidate_relay(relay_id);
-    }
-}
-
-void
-status_update_entry(int relay_id, int is_on)
-{
-    LOGGER_DEBUG("updating relay status ([%d] = %d)\n", relay_id, is_on);
-    relay_t **relays = global_relay_status_list;
-    for(int i = 0; relays[i] != NULL; ++i)
-    {
-        if(relays[i]->id != relay_id)
-        {
-            continue;
-        }
-        relays[i]->is_on = is_on;
-        relay_status_list_json_str = NULL;
-        relay_status_list_json_str_len = 0;
-
-        cache_invalidate_relay(relay_id);
-    }
-}
 
 static int
 is_websocket(const struct mg_connection *nc)
@@ -65,6 +18,14 @@ is_websocket(const struct mg_connection *nc)
     return nc->flags & MG_F_IS_WEBSOCKET;
 }
 
+static void
+invalidate_json_str_cache()
+{
+    relay_status_list_json_str = NULL;
+    relay_status_list_json_str_len = 0;
+    timer = 0;
+}
+
 static void
 validate_json_str_cache()
 {
@@ -83,13 +44,70 @@ validate_json_str_cache()
 
         cJSON_Delete(json);
     }
-
 }
 
 
+void
+status_init()
+{
+    global_relay_status_list = relay_get_all();
+
+    invalidate_json_str_cache();
+    timer = time(NULL);
+}
+
+void
+status_reload_entry(int relay_id)
+{
+    LOGGER_DEBUG("reloading relay status\n");
+    relay_t **relays = global_relay_status_list;
+    for(int i = 0; relays[i] != NULL; ++i)
+    {
+        if(relays[i]->id != relay_id)
+        {
+            continue;
+        }
+
+        int is_on_backup = relays[i]->is_on;
+        relay_t *updated_relay = relay_get_by_id(relay_id);
+        relay_free(relays[i]);
+        relays[i] = updated_relay;
+        relays[i]->is_on = is_on_backup;
+
+        invalidate_json_str_cache();
+
+        cache_invalidate_relay(relay_id);
+    }
+}
+
+void
+status_update_entry(int relay_id, int is_on)
+{
+    LOGGER_DEBUG("updating relay status ([%d] = %d)\n", relay_id, is_on);
+    relay_t **relays = global_relay_status_list;
+    for(int i = 0; relays[i] != NULL; ++i)
+    {
+        if(relays[i]->id != relay_id)
+        {
+            continue;
+        }
+        relays[i]->is_on = is_on;
+
+        invalidate_json_str_cache();
+
+        cache_invalidate_relay(relay_id);
+    }
+}
+
 void
 status_broadcast(struct mg_mgr *mgr)
 {
+    if(timer && (timer - time(NULL) < 10))
+    {
+        return;
+    }
+    timer = time(NULL);
+
     struct mg_connection *c;
     validate_json_str_cache();