Wait for GeoIP databases to be ready before starting monitor

Replaces one-shot os.path.exists() check with a retry loop that attempts
to open the geoip2 Readers directly. If the files are missing or still
being written (e.g. geoipupdate container still downloading), the monitor
waits 5s and retries. A successful Reader open guarantees the file is
complete and valid, since geoip2 reads the MMDB header on open.

Author: djkurlander

monitor.py

@@ -153,8 +153,15 @@ def get_geo_maximal(ip, city_reader, asn_reader):
 def monitor(save_knocks=False):
     init_db()
     r = redis.Redis(host=os.environ.get('REDIS_HOST', 'localhost'), port=6379, db=0, decode_responses=True)
-    c_reader = geoip2.database.Reader(GEOIP_CITY_PATH) if os.path.exists(GEOIP_CITY_PATH) else None
-    a_reader = geoip2.database.Reader(GEOIP_ASN_PATH) if os.path.exists(GEOIP_ASN_PATH) else None
+    while True:
+        try:
+            c_reader = geoip2.database.Reader(GEOIP_CITY_PATH)
+            a_reader = geoip2.database.Reader(GEOIP_ASN_PATH)
+            print("✅ GeoIP databases loaded")
+            break
+        except Exception as e:
+            print(f"⏳ Waiting for GeoIP databases... ({e})")
+            time.sleep(5)
 
     # Seed Redis totals from SQLite on startup to stay in sync
     try: