1 files changed, 41 insertions, 6 deletions
diff --git a/searx/engines/radio_browser.py b/searx/engines/radio_browser.py
index 64208304e..70aecd476 100644
--- a/searx/engines/radio_browser.py
+++ b/searx/engines/radio_browser.py
@@ -5,7 +5,9 @@
    https://de1.api.radio-browser.info/#Advanced_station_search
 
 """
+from __future__ import annotations
 
+import typing
 import random
 import socket
 from urllib.parse import urlencode
@@ -13,9 +15,15 @@ import babel
 from flask_babel import gettext
 
 from searx.network import get
+from searx.enginelib import EngineCache
 from searx.enginelib.traits import EngineTraits
 from searx.locales import language_tag
 
+if typing.TYPE_CHECKING:
+    import logging
+
+    logger = logging.getLogger()
+
 traits: EngineTraits
 
 about = {
@@ -52,11 +60,24 @@ none filters are applied. Valid filters are:
 
 """
 
-servers = []
+CACHE: EngineCache
+"""Persistent (SQLite) key/value cache that deletes its values after ``expire``
+seconds."""
 
 
 def init(_):
-    # see https://api.radio-browser.info
+    global CACHE  # pylint: disable=global-statement
+    CACHE = EngineCache("radio_browser")
+    server_list()
+
+
+def server_list() -> list[str]:
+
+    servers = CACHE.get("servers", [])
+    if servers:
+        return servers
+
+    # hint: can take up to 40sec!
     ips = socket.getaddrinfo("all.api.radio-browser.info", 80, 0, 0, socket.IPPROTO_TCP)
     for ip_tuple in ips:
         _ip: str = ip_tuple[4][0]  # type: ignore
@@ -65,8 +86,22 @@ def init(_):
         if srv not in servers:
             servers.append(srv)
 
+    # update server list once in 24h
+    CACHE.set(key="servers", value=servers, expire=60 * 60 * 24)
+
+    return servers
+
 
 def request(query, params):
+
+    servers = server_list()
+    if not servers:
+        logger.error("Fetched server list is empty!")
+        params["url"] = None
+        return
+
+    server = random.choice(servers)
+
     args = {
         'name': query,
         'order': 'votes',
@@ -87,8 +122,7 @@ def request(query, params):
             if countrycode in traits.custom['countrycodes']:  # type: ignore
                 args['countrycode'] = countrycode
 
-    params['url'] = f"{random.choice(servers)}/json/stations/search?{urlencode(args)}"
-    return params
+    params['url'] = f"{server}/json/stations/search?{urlencode(args)}"
 
 
 def response(resp):
@@ -154,8 +188,9 @@ def fetch_traits(engine_traits: EngineTraits):
 
     babel_reg_list = get_global("territory_languages").keys()
 
-    language_list = get(f'{servers[0]}/json/languages').json()  # type: ignore
-    country_list = get(f'{servers[0]}/json/countries').json()  # type: ignore
+    server = server_list()[0]
+    language_list = get(f'{server}/json/languages').json()  # type: ignore
+    country_list = get(f'{server}/json/countries').json()  # type: ignore
 
     for lang in language_list: