feat: implement telemetry blocking

Proper Linux support for telemetry blocking now.

vollerei/common/telemetry.py

@@ -0,0 +1,31 @@
+import requests
+import concurrent
+from vollerei.utils import write_hosts
+from vollerei.constants import TELEMETRY_HOSTS
+
+
+def _check_telemetry(host: str) -> str | None:
+    try:
+        requests.get(f"https://{host}/", timeout=15)
+    except (requests.ConnectionError, requests.Timeout, requests.HTTPError):
+        return
+    return host
+
+
+def check_telemetry() -> list[str]:
+    futures = []
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        for host in TELEMETRY_HOSTS:
+            futures.append(executor.submit(_check_telemetry, host))
+    hosts = []
+    for future in concurrent.futures.as_completed(futures):
+        host = future.result()
+        if host:
+            hosts.append(host)
+    return hosts
+
+
+def block_telemetry(telemetry_list: list[str] = None):
+    if not telemetry_list:
+        telemetry_list = check_telemetry()
+    write_hosts(telemetry_list)