[MOD/WIP] Move caching in the StateResolve func.

src/Room.c

@@ -443,63 +443,23 @@ RoomStateGet(Room * room)
     return StateDeserialise(database_state);
 }
 HashMap *
-RoomStateGetID(Room * room, char *event_id, HashMap *e)
+RoomStateGetID(Room * room, char *event_id)
 {
     HashMap *event, *state;
-    if (!room)
+    if (!room || !event_id)
     {
         return NULL;
     }
-    if (!e && !event_id)
-    {
-        return NULL;
-    }
-    if (!event_id)
-    {
-        event_id = JsonValueAsString(HashMapGet(e, "event_id"));
-    }
 
-    if (DbExists(room->db, 4, "rooms", room->id, "state", event_id))
-    {
-        DbRef *ref = DbLock(room->db, 4, 
-            "rooms", room->id, "state", event_id
-        );
-        state = StateDeserialise(DbJson(ref));
-        DbUnlock(room->db, ref);
-        if (state)
-        {
-            return state;
-        }
-        
-        /* If a DB error stops us from getting an existing state, 
-         * recompute it. */
-    }
-
-    event = e;
+    event = RoomEventFetch(room, event_id);
     if (!event)
     {
-        event = RoomEventFetch(room, event_id);
-        if (!event)
-        {
-            return NULL;
-        }
+        return NULL;
     }
 
     state = StateResolve(room, event);
-    if (state)
-    {
-        HashMap *json = StateSerialise(state);
-        char *id = room->id;
-        DbRef *ref = DbCreate(room->db, 4, "rooms", id, "state", event_id);
-        DbJsonSet(ref, json);
-        JsonFree(json);
-        DbUnlock(room->db, ref);
 
-    }
-    if (!e)
-    {
-        JsonFree(event);
-    }
+    JsonFree(event);
 
     return state;
 }
@@ -1598,7 +1558,7 @@ RoomEventSendV1(Room * room, HashMap * event)
     client_event = !PopulateEventV1(room, event, &pdu, RoomGetCreator(room));
     pdu_object = PduV1ToJson(&pdu);
 
-    state = RoomStateGetID(room, NULL, pdu_object);
+    state = StateResolve(room, pdu_object);
     if (client_event)
     {
         char *ev_id;
@@ -2065,3 +2025,12 @@ RoomSendInvite(User *sender, bool direct, char *user, Room *room)
     ConfigUnlock(&conf);
     Free(senderStr);
 }
+Db *
+RoomGetDB(Room *room)
+{
+    if (!room)
+    {
+        return NULL;
+    }
+    return room->db;
+}

src/State.c

@@ -247,12 +247,35 @@ StateResolve(Room * room, HashMap * event)
 
     HashMap *ret_state;
 
+    char *room_id, *event_id;
+
+    Db *db;
+
     if (!room || !event)
     {
         return NULL;
     }
 
     /* TODO: Return cached state if it exists */
+    db = RoomGetDB(room);
+    room_id = JsonValueAsString(HashMapGet(event, "room_id"));
+    event_id = JsonValueAsString(HashMapGet(event, "event_id"));
+    if (DbExists(db, 4, "rooms", room_id, "state", event_id))
+    {
+        DbRef *ref = DbLock(db, 4,
+            "rooms", room_id, "state", event_id
+        );
+        ret_state = StateDeserialise(DbJson(ref));
+        DbUnlock(db, ref);
+        if (ret_state)
+        {
+            return ret_state;
+        }
+
+        /* If a DB error stops us from getting an existing state,
+         * recompute it. */
+    }
+
 
     states = ArrayCreate();
     if (!states)
@@ -298,6 +321,15 @@ StateResolve(Room * room, HashMap * event)
     }
     ArrayFree(states);
 
+    if (ret_state)
+    {
+        HashMap *json = StateSerialise(ret_state);
+        DbRef *ref = DbCreate(db, 4, "rooms", room_id, "state", event_id);
+        DbJsonSet(ref, json);
+        JsonFree(json);
+        DbUnlock(db, ref);
+    }
+
     return ret_state;
 }
 bool StateIterate(HashMap *state, char **type, char **key, void **event)

src/include/Room.h

@@ -67,6 +67,11 @@ extern Room * RoomCreate(Db *, User *, RoomCreateRequest *, ServerPart);
  */
 extern Room * RoomLock(Db *, char *);
 
+/** 
+ * Returns the database structure a room is tied to.
+ */
+extern Db * RoomGetDB(Room *);
+
 /**
  * Unlock a room handle, returning it to the database.
  * This function returns the result of calling
@@ -106,7 +111,7 @@ extern HashMap * RoomStateGet(Room *);
  * like
  * .Fn RoomStateGet .
  */
-extern HashMap * RoomStateGetID(Room *, char *, HashMap *);
+extern HashMap * RoomStateGetID(Room *, char *);
 
 /**
  * Get a list of the most recent events in the