Update app.py

app.py

@@ -93,8 +93,14 @@ if missing:
 
 KNOWN_EXTERNAL_USERS = {}
 RATE_LIMIT = defaultdict(list)
+METRICS = defaultdict(int)
 
 CACHE_FILE = "/app/cache/known_users.json"
+CACHE_DIRTY = False
+
+# ============================================================
+# CACHE HANDLING
+# ============================================================
 
 def load_cache():
     global KNOWN_EXTERNAL_USERS
@@ -107,13 +113,24 @@ def load_cache():
             KNOWN_EXTERNAL_USERS = {}
 
 def save_cache():
+    global CACHE_DIRTY
+
+    if not CACHE_DIRTY:
+        return
+
     try:
         os.makedirs(os.path.dirname(CACHE_FILE), exist_ok=True)
         with open(CACHE_FILE, "w") as f:
             json.dump(KNOWN_EXTERNAL_USERS, f)
+        CACHE_DIRTY = False
     except Exception as e:
         logger.error(f"Failed to save cache: {e}")
 
+def periodic_cache_save():
+    while True:
+        save_cache()
+        time.sleep(30)
+
 # ============================================================
 # HELPERS
 # ============================================================
@@ -134,14 +151,14 @@ def is_known_user(user_id):
 
     if time.time() - ts > config.cache_ttl:
         del KNOWN_EXTERNAL_USERS[user_id]
-        save_cache()
         return False
 
     return True
 
 def remember_user(user_id):
+    global CACHE_DIRTY
     KNOWN_EXTERNAL_USERS[user_id] = time.time()
-    save_cache()
+    CACHE_DIRTY = True
 
 def is_local_room(room_id):
     try:
@@ -153,21 +170,19 @@ def get_role(user_id):
     return "admin" if user_id in config.admin_users else "user"
 
 # ============================================================
-# RATE LIMIT
+# RATE LIMIT (IMPROVED)
 # ============================================================
 
-def is_rate_limited(domain):
+def is_rate_limited(domain, sender):
+    key = f"{domain}:{sender}"
     now = time.time()
 
-    RATE_LIMIT[domain] = [
-        t for t in RATE_LIMIT[domain]
-        if now - t < 60
-    ]
+    RATE_LIMIT[key] = [t for t in RATE_LIMIT[key] if now - t < 60]
 
-    if len(RATE_LIMIT[domain]) >= config.rate_limit_per_minute:
+    if len(RATE_LIMIT[key]) >= config.rate_limit_per_minute:
         return True
 
-    RATE_LIMIT[domain].append(now)
+    RATE_LIMIT[key].append(now)
     return False
 
 # ============================================================
@@ -290,7 +305,15 @@ def is_likely_dm_event(event):
 
 @app.route("/healthz")
 def health():
-    return {"status": "ok"}
+    return {
+        "status": "ok",
+        "known_users": len(KNOWN_EXTERNAL_USERS),
+        "metrics": dict(METRICS)
+    }
+
+@app.route("/metrics")
+def metrics():
+    return dict(METRICS)
 
 @app.route('/_matrix/client/v3/createRoom', methods=['POST'])
 def create_room():
@@ -309,6 +332,7 @@ def create_room():
     )
 
     if not allowed:
+        METRICS["create_room_blocked"] += 1
         log_event(
             "create_room_blocked",
             actor=user_id,
@@ -319,6 +343,7 @@ def create_room():
         return Response(json.dumps({"errcode": "M_FORBIDDEN"}), status=403)
 
     if is_dm:
+        METRICS["create_room_allowed"] += 1
         log_event(
             "create_room_allowed",
             actor=user_id,
@@ -346,7 +371,7 @@ def invite(room_id, event_id):
 
     domain = extract_domain(sender)
 
-    if is_rate_limited(domain):
+    if is_rate_limited(domain, sender):
         return Response(status=429)
 
     if domain in config.domain_whitelist:
@@ -365,6 +390,7 @@ def invite(room_id, event_id):
             if is_user_in_local_rooms(sender):
                 remember_user(sender)
             else:
+                METRICS["invite_blocked"] += 1
                 log_event(
                     "invite_blocked",
                     actor=sender,
@@ -374,6 +400,7 @@ def invite(room_id, event_id):
                 return Response(status=403)
 
     remember_user(sender)
+    METRICS["invite_allowed"] += 1
 
     return forward_request(
         "PUT",
@@ -421,5 +448,6 @@ if __name__ == '__main__':
     seed_known_users()
 
     threading.Thread(target=periodic_seed, daemon=True).start()
+    threading.Thread(target=periodic_cache_save, daemon=True).start()
 
     app.run(host='0.0.0.0', port=5000)