dev_1.0.0_yuyr_2：重新提交 PR，增加 master/agent 以及系统集成测试 (#17)

Reviewed-on: #17
Reviewed-by: sundapeng <sundp@mail.zgclab.edu.cn>
Reviewed-by: xuxt <xuxt@zgclab.edu.cn>

src/agent/app/state.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+import json
+import os
+import tempfile
+from pathlib import Path
+from typing import Any, Dict, Optional
+
+from .log import get_logger
+
+LOGGER = get_logger("argus.agent.state")
+
+
+def load_node_state(path: str) -> Optional[Dict[str, Any]]:
+    """读取本地 node.json，容器重启后沿用之前的 ID。"""
+    try:
+        with open(path, "r", encoding="utf-8") as handle:
+            return json.load(handle)
+    except FileNotFoundError:
+        return None
+    except json.JSONDecodeError as exc:
+        LOGGER.warning("node.json is invalid JSON; ignoring", extra={"error": str(exc)})
+        return None
+
+
+def save_node_state(path: str, data: Dict[str, Any]) -> None:
+    """原子化写入 node.json，避免并发读取坏数据。"""
+    directory = Path(path).parent
+    directory.mkdir(parents=True, exist_ok=True)
+    with tempfile.NamedTemporaryFile("w", dir=directory, delete=False, encoding="utf-8") as tmp:
+        json.dump(data, tmp, separators=(",", ":"))
+        tmp.flush()
+        os.fsync(tmp.fileno())
+        temp_path = tmp.name
+    os.replace(temp_path, path)
+
+
+def clear_node_state(path: str) -> None:
+    try:
+        os.remove(path)
+    except FileNotFoundError:
+        return
+    except OSError as exc:
+        LOGGER.warning("Failed to remove node state file", extra={"error": str(exc), "path": path})