add: cache (WIP)

src/models/controller.c

@@ -2,6 +2,7 @@
 #include <string.h>
 #include <sqlite3.h>
 
+#include <cache.h>
 #include <cJSON.h>
 #include <logger.h>
 #include <database.h>
@@ -144,6 +145,9 @@ controller_save(controller_t *controller)
             controller->id = sqlite3_last_insert_rowid(global_database);
         }
     }
+
+    cache_invalidate_controller(controller->id);
+
     return result;
 }
 
@@ -183,9 +187,15 @@ controller_free_list(controller_t **controllers)
     free(controllers);
 }
 
-cJSON*
+char*
 controller_to_json(controller_t *controller)
 {
+    char *cached = cache_get_json_controller(controller->id);
+    if(cached)
+    {
+        return cached;
+    }
+
     char uuid_str[UUID_STR_LEN];
     uuid_unparse(controller->uid, uuid_str);
 
@@ -245,12 +255,17 @@ controller_to_json(controller_t *controller)
     cJSON *json_relays = cJSON_CreateArray();
     for(int i = 0; relays[i] != NULL; ++i)
     {
-        cJSON_AddItemToArray(json_relays, relay_to_json(relays[i]));
+        cJSON *json_relay = cJSON_CreateRaw(relay_to_json(relays[i]));
+        cJSON_AddItemToArray(json_relays, json_relay);
     }
     cJSON_AddItemToObject(json, "relays", json_relays);
     relay_free_list(relays);
 
-    return json;
+    char *result = cJSON_Print(json);
+    cJSON_Delete(json);
+
+    cache_put_json_controller(controller->id, result);
+    return result;
 }
 
 controller_t*