refactor/channel & ipc (#349)

Co-authored-by: paisley <8197966+su8su@users.noreply.github.com>
Co-authored-by: zuolingxuan <zuolingxuan@bytedance.com>

tests/unit/host-api.test.ts

@@ -0,0 +1,88 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const invokeIpcMock = vi.fn();
+
+vi.mock('@/lib/api-client', () => ({
+  invokeIpc: (...args: unknown[]) => invokeIpcMock(...args),
+}));
+
+describe('host-api', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+  });
+
+  it('uses IPC proxy and returns unified envelope json', async () => {
+    invokeIpcMock.mockResolvedValueOnce({
+      ok: true,
+      data: {
+        status: 200,
+        ok: true,
+        json: { success: true },
+      },
+    });
+
+    const { hostApiFetch } = await import('@/lib/host-api');
+    const result = await hostApiFetch<{ success: boolean }>('/api/settings');
+
+    expect(result.success).toBe(true);
+    expect(invokeIpcMock).toHaveBeenCalledWith(
+      'hostapi:fetch',
+      expect.objectContaining({ path: '/api/settings', method: 'GET' }),
+    );
+  });
+
+  it('supports legacy proxy envelope response', async () => {
+    invokeIpcMock.mockResolvedValueOnce({
+      success: true,
+      status: 200,
+      ok: true,
+      json: { ok: 1 },
+    });
+
+    const { hostApiFetch } = await import('@/lib/host-api');
+    const result = await hostApiFetch<{ ok: number }>('/api/settings');
+    expect(result.ok).toBe(1);
+  });
+
+  it('throws proxy error from unified envelope', async () => {
+    invokeIpcMock.mockResolvedValueOnce({
+      ok: false,
+      error: { message: 'No handler registered for hostapi:fetch' },
+    });
+
+    const { hostApiFetch } = await import('@/lib/host-api');
+    await expect(hostApiFetch('/api/test')).rejects.toThrow('No handler registered for hostapi:fetch');
+  });
+
+  it('throws message from legacy non-ok envelope', async () => {
+    invokeIpcMock.mockResolvedValueOnce({
+      success: true,
+      ok: false,
+      status: 401,
+      json: { error: 'Invalid Authentication' },
+    });
+
+    const { hostApiFetch } = await import('@/lib/host-api');
+    await expect(hostApiFetch('/api/test')).rejects.toThrow('Invalid Authentication');
+  });
+
+  it('falls back to browser fetch only when IPC channel is unavailable', async () => {
+    const fetchMock = vi.fn().mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({ fallback: true }),
+    });
+    vi.stubGlobal('fetch', fetchMock);
+
+    invokeIpcMock.mockRejectedValueOnce(new Error('Invalid IPC channel: hostapi:fetch'));
+
+    const { hostApiFetch } = await import('@/lib/host-api');
+    const result = await hostApiFetch<{ fallback: boolean }>('/api/test');
+
+    expect(result.fallback).toBe(true);
+    expect(fetchMock).toHaveBeenCalledWith(
+      'http://127.0.0.1:3210/api/test',
+      expect.objectContaining({ headers: expect.any(Object) }),
+    );
+  });
+});