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feat: add trace-level input/output to Langfuse observability (#69)

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* feat: add trace-level input/output to Langfuse observability

- Add @langfuse/client and @langfuse/tracing dependencies
- Wrap POST handler with observe() for proper tracing
- Use updateActiveTrace() to set trace input, output, sessionId, userId
- Filter Next.js HTTP spans in shouldExportSpan so AI SDK spans become root traces
- Enable recordInputs/recordOutputs in experimental_telemetry

* refactor: extract Langfuse logic to separate lib/langfuse.ts module
This commit is contained in:
Dayuan Jiang
2025-12-04 11:24:26 +09:00
committed by GitHub
parent bed04c82f8
commit 9d9613a8d1
5 changed files with 172 additions and 39 deletions
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47
package-lock.json generated
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@@ -7,6 +7,7 @@
"": {
"name": "next-ai-draw-io",
"version": "0.2.0",
"license": "Apache-2.0",
"dependencies": {
"@ai-sdk/amazon-bedrock": "^3.0.62",
"@ai-sdk/anthropic": "^2.0.44",
@@ -15,7 +16,9 @@
"@ai-sdk/google": "^2.0.0",
"@ai-sdk/openai": "^2.0.19",
"@ai-sdk/react": "^2.0.22",
"@langfuse/client": "^4.4.9",
"@langfuse/otel": "^4.4.4",
"@langfuse/tracing": "^4.4.9",
"@next/third-parties": "^16.0.6",
"@openrouter/ai-sdk-provider": "^1.2.3",
"@opentelemetry/sdk-trace-node": "^2.2.0",
@@ -1594,10 +1597,24 @@
"@jridgewell/sourcemap-codec": "^1.4.14"
}
},
"node_modules/@langfuse/client": {
"version": "4.4.9",
"resolved": "https://registry.npmjs.org/@langfuse/client/-/client-4.4.9.tgz",
"integrity": "sha512-Y7bU70tMx/lYOU/A7NGvXXVZoL3AiFigbf7EwS5PVFc0xd34eRUmvwdLwEtuK7CnYTyxIZTzVVP2KEaicWCYZg==",
"license": "MIT",
"dependencies": {
"@langfuse/core": "^4.4.9",
"@langfuse/tracing": "^4.4.9",
"mustache": "^4.2.0"
},
"peerDependencies": {
"@opentelemetry/api": "^1.9.0"
}
},
"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==",
"version": "4.4.9",
"resolved": "https://registry.npmjs.org/@langfuse/core/-/core-4.4.9.tgz",
"integrity": "sha512-9Hz/eH6dkOP8E/FLt1fsAQR8RE/TF8Ag/39GmY8JjN1o/Tl/MFJfK2QvqRGrkjDkIkMJGOSD+iQmV2pYm4upDA==",
"license": "MIT",
"peerDependencies": {
"@opentelemetry/api": "^1.9.0"
@@ -1621,6 +1638,21 @@
"@opentelemetry/sdk-trace-base": "^2.0.1"
}
},
"node_modules/@langfuse/tracing": {
"version": "4.4.9",
"resolved": "https://registry.npmjs.org/@langfuse/tracing/-/tracing-4.4.9.tgz",
"integrity": "sha512-if+G/v9NsyTKj40KKX96bRSdMXwyDbVL4GJQvmwQ9SxvGYF+d99pGFB7L6QOeCd1KBHMdmDe733ncmvCnSHJ9w==",
"license": "MIT",
"dependencies": {
"@langfuse/core": "^4.4.9"
},
"engines": {
"node": ">=20"
},
"peerDependencies": {
"@opentelemetry/api": "^1.9.0"
}
},
"node_modules/@napi-rs/wasm-runtime": {
"version": "0.2.12",
"resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.12.tgz",
@@ -7690,6 +7722,15 @@
"integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
"license": "MIT"
},
"node_modules/mustache": {
"version": "4.2.0",
"resolved": "https://registry.npmjs.org/mustache/-/mustache-4.2.0.tgz",
"integrity": "sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ==",
"license": "MIT",
"bin": {
"mustache": "bin/mustache"
}
},
"node_modules/nanoid": {
"version": "3.3.11",
"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",