adding firewall function to firegex!

backend/modules/firewall/firewall.py

@@ -0,0 +1,24 @@
+import asyncio
+from modules.firewall.nftables import FiregexTables
+from modules.firewall.models import Rule
+from utils.sqlite import SQLite
+
+nft = FiregexTables()
+
+class FirewallManager:
+    def __init__(self, db:SQLite):
+        self.db = db
+        self.lock = asyncio.Lock()
+
+    async def close(self):
+        async with self.lock:
+            nft.reset()
+    
+    async def init(self):
+        FiregexTables().init()
+        await self.reload()
+
+    async def reload(self):
+        async with self.lock:
+            nft.set(map(Rule.from_dict, self.db.query('SELECT * FROM rules WHERE active = 1 ORDER BY rule_id;')))
+