feat: OTelのHTTPサーバ自動計装を追加 (#17711)

packages/backend/test/unit/server/http-server-instrumentation.ts

@@ -0,0 +1,53 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { describe, expect, test, vi } from 'vitest';
+import { shouldRegisterHttpServerInstrumentation, registerHttpServerInstrumentation } from '@/server/http-server-instrumentation.js';
+
+const mocks = vi.hoisted(() => ({
+	plugin: vi.fn(),
+	instrumentation: vi.fn(),
+}));
+
+vi.mock('@fastify/otel', () => ({
+	FastifyOtelInstrumentation: class {
+		public plugin = mocks.plugin;
+
+		public constructor(options: unknown) {
+			mocks.instrumentation(options);
+		}
+	},
+}));
+
+describe('http-server-instrumentation', () => {
+	test('registers Fastify instrumentation when only OpenTelemetry is configured', async () => {
+		const plugin = vi.fn();
+		const fastify = { register: vi.fn().mockResolvedValue(undefined) };
+		mocks.plugin.mockReturnValue(plugin);
+
+		await registerHttpServerInstrumentation(fastify as any, { otelForBackend: {} } as any);
+
+		expect(mocks.instrumentation).toHaveBeenCalledTimes(1);
+		expect(fastify.register).toHaveBeenCalledWith(plugin);
+
+		const requestHook = mocks.instrumentation.mock.calls[0][0].requestHook;
+		const span = { updateName: vi.fn() };
+		requestHook(span, { method: 'POST', routeOptions: { url: '/notes/create' } });
+		expect(span.updateName).toHaveBeenCalledWith('POST /notes/create');
+	});
+
+	test('does not register duplicate request instrumentation with Sentry', async () => {
+		const fastify = { register: vi.fn() };
+
+		await registerHttpServerInstrumentation(fastify as any, { otelForBackend: {}, sentryForBackend: {} } as any);
+
+		expect(fastify.register).not.toHaveBeenCalled();
+		expect(shouldRegisterHttpServerInstrumentation({ otelForBackend: {}, sentryForBackend: {} } as any)).toBe(false);
+	});
+
+	test('does not register instrumentation without OpenTelemetry', () => {
+		expect(shouldRegisterHttpServerInstrumentation({} as any)).toBe(false);
+	});
+});