Crea servizio watchdog configurabile

src/bakrest/server_check.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+import json
+import socket
+from dataclasses import asdict, dataclass
+from datetime import datetime, timezone
+from pathlib import Path
+
+from .config import BackupConfig
+
+
+@dataclass(frozen=True)
+class ServerStatus:
+    reachable: bool
+    checked_at: str
+    message: str
+
+
+def check_server(config: BackupConfig) -> ServerStatus:
+    checked_at = datetime.now(timezone.utc).isoformat()
+    if config.server_check.type != "tcp":
+        return ServerStatus(False, checked_at, f"Unsupported check type: {config.server_check.type}")
+
+    try:
+        with socket.create_connection(
+            (config.server_host, config.server_check.port),
+            timeout=config.server_check.timeout_seconds,
+        ):
+            return ServerStatus(True, checked_at, "Server reachable")
+    except OSError as exc:
+        return ServerStatus(False, checked_at, str(exc))
+
+
+def write_status(path: Path, status: ServerStatus, pending_count: int) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    payload = asdict(status)
+    payload["pending_count"] = pending_count
+    path.write_text(json.dumps(payload, indent=2), encoding="utf-8")