feat: add optional Langfuse observability integration

- Add session tracking with unique sessionId per conversation - Add user tracking via IP address (x-forwarded-for header) - Make telemetry conditional - only enabled if LANGFUSE_PUBLIC_KEY is set - Add environment variable validation in instrumentation.ts - Add sessionId validation (type check + 200 char limit) - Update env.example with Langfuse configuration docs - Remove unused langfuse-vercel and @vercel/otel packages
2026-01-02 22:32:27 +08:00 · 2025-12-04 00:13:42 +09:00
parent d84edb529c
commit 30b598d960
6 changed files with 265 additions and 138 deletions
--- a/app/api/chat/route.ts
+++ b/app/api/chat/route.ts
@@ -30,7 +30,16 @@ function createCachedStreamResponse(xml: string): Response {

 export async function POST(req: Request) {
  try {
-    const { messages, xml } = await req.json();
+    const { messages, xml, sessionId } = await req.json();
+
+    // Get user IP for Langfuse tracking
+    const forwardedFor = req.headers.get('x-forwarded-for');
+    const userId = forwardedFor?.split(',')[0]?.trim() || 'anonymous';
+
+    // Validate sessionId for Langfuse (must be string, max 200 chars)
+    const validSessionId = sessionId && typeof sessionId === 'string' && sessionId.length <= 200
+      ? sessionId
+      : undefined;

    // === CACHE CHECK START ===
    const isFirstMessage = messages.length === 1;
@@ -257,7 +266,16 @@ ${lastMessageText}
      messages: [systemMessageWithCache, ...enhancedMessages],
      ...(providerOptions && { providerOptions }),
      ...(headers && { headers }),
-      experimental_telemetry: { isEnabled: true },
+      // Only enable telemetry if Langfuse is configured
+      ...(process.env.LANGFUSE_PUBLIC_KEY && {
+        experimental_telemetry: {
+          isEnabled: true,
+          metadata: {
+            sessionId: validSessionId,
+            userId: userId,
+          },
+        },
+      }),
      onFinish: ({ usage, providerMetadata }) => {
        console.log('[Cache] Usage:', JSON.stringify({
          inputTokens: usage?.inputTokens,
--- a/components/chat-panel.tsx
+++ b/components/chat-panel.tsx
@@ -61,6 +61,9 @@ export default function ChatPanel({
    const [showHistory, setShowHistory] = useState(false);
    const [input, setInput] = useState("");

+    // Generate a unique session ID for Langfuse tracing
+    const [sessionId, setSessionId] = useState(() => `session-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`);
+
    const { messages, sendMessage, addToolResult, status, error, setMessages } =
        useChat({
            transport: new DefaultChatTransport({
@@ -177,6 +180,7 @@ Please retry with an adjusted search pattern or use display_diagram if retries a
                    {
                        body: {
                            xml: chartXml,
+                            sessionId,
                        },
                    }
                );
@@ -293,6 +297,7 @@ Please retry with an adjusted search pattern or use display_diagram if retries a
                    onClearChat={() => {
                        setMessages([]);
                        clearDiagram();
+                        setSessionId(`session-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`);
                    }}
                    files={files}
                    onFileChange={handleFileChange}
--- a/env.example
+++ b/env.example
@@ -41,3 +41,9 @@ AI_MODEL=global.anthropic.claude-sonnet-4-5-20250929-v1:0
 # DeepSeek Configuration
 # DEEPSEEK_API_KEY=sk-...
 # DEEPSEEK_BASE_URL=https://api.deepseek.com/v1  # Optional: Custom endpoint
+
+# Langfuse Observability (Optional)
+# Enable LLM tracing and analytics - https://langfuse.com
+# LANGFUSE_PUBLIC_KEY=pk-lf-...
+# LANGFUSE_SECRET_KEY=sk-lf-...
+# LANGFUSE_BASEURL=https://cloud.langfuse.com  # EU region, use https://us.cloud.langfuse.com for US
--- a/instrumentation.ts
+++ b/instrumentation.ts
@@ -1,9 +1,22 @@
-import { registerOTel } from '@vercel/otel';
-import { LangfuseExporter } from 'langfuse-vercel';
+import { LangfuseSpanProcessor } from '@langfuse/otel';
+import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';

 export function register() {
-  registerOTel({
-    serviceName: 'next-ai-draw-io',
-    traceExporter: new LangfuseExporter(),
+  // Skip telemetry if Langfuse env vars are not configured
+  if (!process.env.LANGFUSE_PUBLIC_KEY || !process.env.LANGFUSE_SECRET_KEY) {
+    console.warn('[Langfuse] Environment variables not configured - telemetry disabled');
+    return;
+  }
+
+  const langfuseSpanProcessor = new LangfuseSpanProcessor({
+    publicKey: process.env.LANGFUSE_PUBLIC_KEY,
+    secretKey: process.env.LANGFUSE_SECRET_KEY,
+    baseUrl: process.env.LANGFUSE_BASEURL,
  });
+
+  const tracerProvider = new NodeTracerProvider({
+    spanProcessors: [langfuseSpanProcessor],
+  });
+
+  tracerProvider.register();
 }
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,24 +15,21 @@
                "@ai-sdk/google": "^2.0.0",
                "@ai-sdk/openai": "^2.0.19",
                "@ai-sdk/react": "^2.0.22",
+                "@langfuse/otel": "^4.4.4",
                "@next/third-parties": "^16.0.6",
                "@openrouter/ai-sdk-provider": "^1.2.3",
-                "@opentelemetry/api-logs": "^0.208.0",
-                "@opentelemetry/instrumentation": "^0.208.0",
-                "@opentelemetry/sdk-logs": "^0.208.0",
+                "@opentelemetry/sdk-trace-node": "^2.2.0",
                "@radix-ui/react-dialog": "^1.1.6",
                "@radix-ui/react-scroll-area": "^1.2.3",
                "@radix-ui/react-slot": "^1.1.2",
                "@radix-ui/react-tooltip": "^1.1.8",
                "@vercel/analytics": "^1.5.0",
-                "@vercel/otel": "^2.1.0",
                "@xmldom/xmldom": "^0.9.8",
                "ai": "^5.0.89",
                "base-64": "^1.0.0",
                "class-variance-authority": "^0.7.1",
                "clsx": "^2.1.1",
                "jsdom": "^26.0.0",
-                "langfuse-vercel": "^3.38.6",
                "lucide-react": "^0.483.0",
                "next": "15.2.3",
                "ollama-ai-provider-v2": "^1.5.4",
@@ -1597,6 +1594,33 @@
                "@jridgewell/sourcemap-codec": "^1.4.14"
            }
        },
+        "node_modules/@langfuse/core": {
+            "version": "4.4.4",
+            "resolved": "https://registry.npmjs.org/@langfuse/core/-/core-4.4.4.tgz",
+            "integrity": "sha512-hmtMNAOIsvDwT/xld0CJPXrIsakETbelSmAOGEY07faKtKdJy/BGjxexBbfAWLPgAC6wqC2fK2ByaYCGgC7MBw==",
+            "license": "MIT",
+            "peerDependencies": {
+                "@opentelemetry/api": "^1.9.0"
+            }
+        },
+        "node_modules/@langfuse/otel": {
+            "version": "4.4.4",
+            "resolved": "https://registry.npmjs.org/@langfuse/otel/-/otel-4.4.4.tgz",
+            "integrity": "sha512-b6VfVZUf5U1HrbPicUNZ0jYuR2QmnGhJpOV85Kbonzkslu60XggzjKi1UzTAVCA0sVzABK7WvqWvojpk02bfAw==",
+            "license": "MIT",
+            "dependencies": {
+                "@langfuse/core": "^4.4.4"
+            },
+            "engines": {
+                "node": ">=20"
+            },
+            "peerDependencies": {
+                "@opentelemetry/api": "^1.9.0",
+                "@opentelemetry/core": "^2.0.1",
+                "@opentelemetry/exporter-trace-otlp-http": ">=0.202.0 <1.0.0",
+                "@opentelemetry/sdk-trace-base": "^2.0.1"
+            }
+        },
        "node_modules/@napi-rs/wasm-runtime": {
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@@ -1870,6 +1894,7 @@
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            "license": "Apache-2.0",
+            "peer": true,
            "dependencies": {
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@@ -1877,6 +1902,18 @@
                "node": ">=8.0.0"
            }
        },
+        "node_modules/@opentelemetry/context-async-hooks": {
+            "version": "2.2.0",
+            "resolved": "https://registry.npmjs.org/@opentelemetry/context-async-hooks/-/context-async-hooks-2.2.0.tgz",
+            "integrity": "sha512-qRkLWiUEZNAmYapZ7KGS5C4OmBLcP/H2foXeOEaowYCR0wi89fHejrfYfbuLVCMLp/dWZXKvQusdbUEZjERfwQ==",
+            "license": "Apache-2.0",
+            "engines": {
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@@ -1892,15 +1929,57 @@
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-        "node_modules/@opentelemetry/instrumentation": {
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@@ -1977,6 +2056,23 @@
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@@ -1986,6 +2082,80 @@
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@@ -3524,24 +3693,6 @@
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@@ -3563,15 +3715,6 @@
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@@ -7592,27 +7684,12 @@
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@@ -8124,6 +8201,31 @@
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@@ -8362,19 +8464,6 @@
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--- a/package.json
+++ b/package.json
@@ -16,24 +16,21 @@
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