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/client.py

@@ -0,0 +1,60 @@
+from __future__ import annotations
+
+import json
+from typing import Any, Dict, Optional
+
+import requests
+
+from .log import get_logger
+
+LOGGER = get_logger("argus.agent.client")
+
+
+class MasterAPIError(Exception):
+    def __init__(self, message: str, status_code: int, payload: Optional[Dict[str, Any]] = None) -> None:
+        super().__init__(message)
+        self.status_code = status_code
+        self.payload = payload or {}
+
+
+class AgentClient:
+    def __init__(self, base_url: str, *, timeout: int = 10) -> None:
+        self._base_url = base_url.rstrip("/")
+        self._timeout = timeout
+        self._session = requests.Session()
+
+    def register_node(self, body: Dict[str, Any]) -> Dict[str, Any]:
+        """调用 master 注册接口，返回节点对象。"""
+        url = f"{self._base_url}/api/v1/master/nodes"
+        response = self._session.post(url, json=body, timeout=self._timeout)
+        return self._parse_response(response, "Failed to register node")
+
+    def update_status(self, node_id: str, body: Dict[str, Any]) -> Dict[str, Any]:
+        """上报健康信息，由 master 更新 last_report。"""
+        url = f"{self._base_url}/api/v1/master/nodes/{node_id}/status"
+        response = self._session.put(url, json=body, timeout=self._timeout)
+        return self._parse_response(response, "Failed to update node status")
+
+    def _parse_response(self, response: requests.Response, error_prefix: str) -> Dict[str, Any]:
+        content_type = response.headers.get("Content-Type", "")
+        payload: Dict[str, Any] | None = None
+        if "application/json" in content_type:
+            try:
+                payload = response.json()
+            except json.JSONDecodeError:
+                LOGGER.warning("Response contained invalid JSON", extra={"status": response.status_code})
+
+        if response.status_code >= 400:
+            message = payload.get("error") if isinstance(payload, dict) else response.text
+            raise MasterAPIError(
+                f"{error_prefix}: {message}",
+                status_code=response.status_code,
+                payload=payload if isinstance(payload, dict) else None,
+            )
+
+        if payload is None:
+            try:
+                payload = response.json()
+            except json.JSONDecodeError as exc:
+                raise MasterAPIError("Master returned non-JSON payload", response.status_code) from exc
+        return payload