wizardchen
492e92580b
Closes #620 #497. Add opt-in Langfuse observability covering all five model types (chat, embedding, rerank, VLM, ASR) with HTTP-request-scoped traces and Docker Compose support (both cloud and self-hosted). Core package internal/tracing/langfuse: - HTTP client with batched async ingestion (non-blocking in request path) - Sampling, environment / release tagging, and graceful fallback when LANGFUSE_* env vars are absent (wrappers become no-ops) - Gin middleware opens one trace per traced request and finishes it after the handler chain returns, attaching method / path / user / session - Trace context is stored under a typed key exported from internal/types so logger.CloneContext can preserve it across handler / goroutine boundaries (otherwise each LLM call auto-created an orphan trace, fragmenting one request into many) Per-model generation wrappers (opt-in via NewChat/NewEmbedder/...): - chat: captures prompt, streaming output, token usage + TTFT - embedding: approximates tokens when the provider omits usage - rerank: previews query/docs, summarizes results to keep payload small - vlm: records image count and total bytes, never uploads raw pixels - asr: records file size and audio duration, never uploads audio bytes Async title generation (GenerateTitleAsync) now forwards the trace key into the goroutine so title calls appear under the parent chat trace. Docker Compose: - LANGFUSE_* env passthrough on the `app` service for cloud deployments - Optional `langfuse` profile spins up a self-hosted Langfuse stack that reuses WeKnora's existing PostgreSQL (separate database via an idempotent init container that fixes ICU collation drift) and Redis (separate DB number), adding only ClickHouse, MinIO, web and worker containers - web/worker entrypoints URL-encode DB_PASSWORD / REDIS_PASSWORD at start to avoid Prisma P1013 when passwords contain @ / # / etc. Docs: docs/Langfuse集成.md covers cloud vs self-hosted, per-model usage strategy, code map, and resource footprint.
80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package asr
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import (
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"context"
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"github.com/Tencent/WeKnora/internal/tracing/langfuse"
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)
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// langfuseASR wraps an ASR implementation and reports each Transcribe call
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// as a Langfuse generation observation. Audio bytes are not uploaded — we
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// record file name, audio size and duration (derived from segment end times)
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// so usage can be billed by second/minute, which is how most ASR providers
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// price their services.
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type langfuseASR struct {
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inner ASR
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}
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func (l *langfuseASR) GetModelName() string { return l.inner.GetModelName() }
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func (l *langfuseASR) GetModelID() string { return l.inner.GetModelID() }
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func (l *langfuseASR) Transcribe(ctx context.Context, audioBytes []byte, fileName string) (*TranscriptionResult, error) {
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mgr := langfuse.GetManager()
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if !mgr.Enabled() {
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return l.inner.Transcribe(ctx, audioBytes, fileName)
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}
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genCtx, gen := mgr.StartGeneration(ctx, langfuse.GenerationOptions{
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Name: "asr.transcribe",
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Model: l.inner.GetModelName(),
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Input: map[string]interface{}{
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"file_name": fileName,
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"audio_size": len(audioBytes),
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},
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Metadata: map[string]interface{}{
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"model_id": l.inner.GetModelID(),
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"audio_size": len(audioBytes),
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},
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})
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result, err := l.inner.Transcribe(genCtx, audioBytes, fileName)
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output := map[string]interface{}{}
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var duration float64
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if result != nil {
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output["text"] = result.Text
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output["segment_count"] = len(result.Segments)
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if n := len(result.Segments); n > 0 {
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duration = result.Segments[n-1].End
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output["duration_seconds"] = duration
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}
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}
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// ASR is billed per second; we emit the audio duration (when available)
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// in the "Output" side of usage so users can configure per-model pricing
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// in Langfuse (e.g. $0.006 per minute for Whisper-1).
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var usage *langfuse.TokenUsage
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if duration > 0 {
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seconds := int(duration + 0.5)
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usage = &langfuse.TokenUsage{
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Output: seconds,
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Total: seconds,
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Unit: "SECONDS",
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}
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}
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gen.Finish(output, usage, err)
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return result, err
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}
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// wrapASRLangfuse applies the Langfuse decorator when the manager is enabled.
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func wrapASRLangfuse(a ASR, err error) (ASR, error) {
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if err != nil || a == nil {
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return a, err
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}
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if !langfuse.GetManager().Enabled() {
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return a, nil
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}
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return &langfuseASR{inner: a}, nil
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}
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