v2.5.0: wait for telemt readiness in web admin

admin-web/server.py

@@ -16,6 +16,7 @@ import mimetypes
 import os
 import re
 import secrets
+import socket
 import subprocess
 import time
 import urllib.error
@@ -152,7 +153,11 @@ def write_telemt_users(users: dict[str, str]) -> None:
 
 def restart_service(name: str) -> bool:
     code, _, _ = run(["systemctl", "restart", name], timeout=25)
-    return code == 0
+    if code != 0:
+        return False
+    if name == "telemt":
+        return wait_tcp_port(read_telemt_port(), timeout=90)
+    return True
 
 
 def service_status(name: str) -> str:
@@ -168,6 +173,38 @@ def service_status(name: str) -> str:
     return "stopped"
 
 
+def read_telemt_port() -> int:
+    if not TELEMT_CONFIG.exists():
+        return 443
+    in_server = False
+    for raw in TELEMT_CONFIG.read_text(encoding="utf-8", errors="ignore").splitlines():
+        line = raw.strip()
+        if line == "[server]":
+            in_server = True
+            continue
+        if in_server and line.startswith("["):
+            break
+        if in_server and line.startswith("port") and "=" in line:
+            try:
+                return int(line.split("=", 1)[1].strip().split("#", 1)[0])
+            except ValueError:
+                return 443
+    return 443
+
+
+def wait_tcp_port(port: int, timeout: int = 90) -> bool:
+    deadline = time.monotonic() + timeout
+    while time.monotonic() < deadline:
+        if service_status("telemt") not in {"running", "activating"}:
+            return False
+        try:
+            with socket.create_connection(("127.0.0.1", port), timeout=0.6):
+                return True
+        except OSError:
+            time.sleep(1)
+    return False
+
+
 def public_ip() -> str:
     code, stdout, _ = run(["curl", "-s", "-4", "--max-time", "3", "https://api.ipify.org"], timeout=5)
     ip = stdout.strip()