headlamp-tns-csi-plugin/CLAUDE.md

headlamp-tns-csi-plugin

Headlamp plugin for tns-csi CSI driver visibility and kbench benchmarking.

Project

• Plugin name: headlamp-tns-csi-plugin
• Provisioner: tns.csi.io
• Upstream driver: https://github.com/fenio/tns-csi
• Benchmark tool: https://github.com/longhorn/kbench
• Reference plugin: ../headlamp-polaris-plugin

Commands

npm start          # dev server with hot reload
npm run build      # production build
npm run package    # package for headlamp
npm run tsc        # TypeScript type check (no emit)
npm run lint       # ESLint
npm test           # vitest run
npm run test:watch # vitest watch mode

Architecture

src/
├── index.tsx                    # Plugin entry: registerRoute, registerSidebarEntry, etc.
├── api/
│   ├── k8s.ts                   # Types + filtering helpers (provisioner: tns.csi.io)
│   ├── metrics.ts               # Prometheus text format parser
│   ├── kbench.ts                # kbench Job/PVC lifecycle + FIO log parser
│   └── TnsCsiDataContext.tsx    # Shared React context provider
└── components/
    ├── OverviewPage.tsx
    ├── StorageClassesPage.tsx
    ├── VolumesPage.tsx
    ├── SnapshotsPage.tsx
    ├── MetricsPage.tsx
    ├── BenchmarkPage.tsx        # ONLY write operation in the plugin
    ├── DriverStatusCard.tsx
    └── PVCDetailSection.tsx     # Injected into Headlamp PVC detail view

Key constants

• Provisioner: tns.csi.io
• Controller pod selector: app.kubernetes.io/name=tns-csi-driver,app.kubernetes.io/component=controller
• Node pod selector: app.kubernetes.io/name=tns-csi-driver,app.kubernetes.io/component=node
• Driver namespace: kube-system
• Metrics port: 8080
• kbench image: yasker/kbench:latest
• kbench managed-by label: app.kubernetes.io/managed-by=headlamp-tns-csi-plugin

Code conventions

• Functional React components only — no class components
• All imports from @kinvolk/headlamp-plugin/lib and @kinvolk/headlamp-plugin/lib/CommonComponents
• No additional UI libraries (no MUI direct imports, no Ant Design, etc.)
• TypeScript strict mode — no any, use unknown + type guards at API boundaries
• Slide-in detail panels follow the polaris plugin pattern: URL hash state, Escape to close, backdrop overlay
• Context provider (TnsCsiDataProvider) wraps each route component in index.tsx
• Tests: vitest + @testing-library/react, mock with vi.mock('@kinvolk/headlamp-plugin/lib', ...)

Subagent guidance

When launching subagents for tasks in this repo:

• Research tasks (reading files, searching code, exploring GitHub): use subagent_type: Explore with tools: Read, Glob, Grep, Bash, WebFetch, GitHub MCP
• Implementation tasks (writing/editing files): use subagent_type: general-purpose
• Debugging: use subagent_type: debugger
• Avoid launching background agents for open-ended research — do research in the main session using Glob, Grep, Read, and GitHub MCP directly, then delegate scoped write tasks to agents
• The main session has broader tool approvals than subagent sandboxes; use it for exploration

Testing

All tests must pass before committing:

npm test        # 67 tests across 4 test files
npm run tsc     # must exit 0

Mock pattern for headlamp APIs:

vi.mock('@kinvolk/headlamp-plugin/lib', () => ({
  ApiProxy: { request: vi.fn().mockResolvedValue({ items: [] }) },
  K8s: {
    ResourceClasses: {
      StorageClass: { useList: vi.fn(() => [[], null]) },
      PersistentVolume: { useList: vi.fn(() => [[], null]) },
      PersistentVolumeClaim: { useList: vi.fn(() => [[], null]) },
    },
  },
}));