feat(metrics): add blockstats + netstat client wrappers

backend/tests/test_metrics_client.py

@@ -0,0 +1,37 @@
+from unittest.mock import MagicMock
+from app.proxmox.client import ProxmoxClient
+
+
+def _client_with_mock(proxmox):
+    c = ProxmoxClient.__new__(ProxmoxClient)
+    c.proxmox = proxmox
+    return c
+
+
+def test_get_vm_blockstats_returns_text():
+    px = MagicMock()
+    px.nodes.return_value.qemu.return_value.monitor.post.return_value = "drive-scsi0: rd_operations=5 wr_operations=2"
+    c = _client_with_mock(px)
+    assert "rd_operations=5" in c.get_vm_blockstats("prod", 114)
+    px.nodes.return_value.qemu.return_value.monitor.post.assert_called_once_with(command="info blockstats")
+
+
+def test_get_vm_blockstats_swallows_errors():
+    px = MagicMock()
+    px.nodes.return_value.qemu.return_value.monitor.post.side_effect = RuntimeError("nope")
+    c = _client_with_mock(px)
+    assert c.get_vm_blockstats("prod", 114) == ""
+
+
+def test_get_node_netstat_returns_rows():
+    px = MagicMock()
+    px.nodes.return_value.netstat.get.return_value = [{"dev": "tap114i0", "vmid": "114", "in": "1", "out": "2"}]
+    c = _client_with_mock(px)
+    assert c.get_node_netstat("prod")[0]["dev"] == "tap114i0"
+
+
+def test_get_node_netstat_swallows_errors():
+    px = MagicMock()
+    px.nodes.return_value.netstat.get.side_effect = RuntimeError("nope")
+    c = _client_with_mock(px)
+    assert c.get_node_netstat("prod") == []