Add URL health checks from config

services/http_checks.py

@@ -0,0 +1,38 @@
+import time
+from typing import Iterable, Tuple
+from urllib.error import HTTPError, URLError
+from urllib.request import Request, urlopen
+
+
+def get_url_checks(cfg) -> Iterable[Tuple[str, str]]:
+    docker_cfg = cfg.get("docker", {})
+    containers = docker_cfg.get("containers", {})
+    for alias, value in containers.items():
+        if isinstance(value, str):
+            continue
+        if isinstance(value, dict):
+            url = value.get("url")
+            if url:
+                yield alias, url
+
+
+def check_url(url: str, timeout: int = 5) -> Tuple[bool, int | None, int | None, str | None]:
+    start = time.time()
+    req = Request(url, headers={"User-Agent": "tg-admin-bot"})
+    try:
+        with urlopen(req, timeout=timeout) as resp:
+            status = int(resp.status)
+    except HTTPError as e:
+        status = int(e.code)
+        elapsed_ms = int((time.time() - start) * 1000)
+        return False, status, elapsed_ms, None
+    except URLError as e:
+        elapsed_ms = int((time.time() - start) * 1000)
+        return False, None, elapsed_ms, str(e.reason)
+    except Exception as e:
+        elapsed_ms = int((time.time() - start) * 1000)
+        return False, None, elapsed_ms, str(e)
+
+    elapsed_ms = int((time.time() - start) * 1000)
+    ok = status < 400
+    return ok, status, elapsed_ms, None