.dockerignore

@@ -0,0 +1,9 @@
+.git
+.gitignore
+*.md
+LICENSE
+renovate.json
+*_test.go
+e2e_test.go
+__pycache__
+.env*

Dockerfile

@@ -10,7 +10,7 @@ RUN go mod download
 
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /voice-assistant .
+RUN CGO_ENABLED=0 GOOS=linux GOAMD64=v3 go build -ldflags="-w -s" -o /voice-assistant .
 
 # Runtime stage
 FROM scratch

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"encoding/base64"
 	"fmt"
 	"log/slog"
 	"os"
@@ -15,6 +14,8 @@ import (
 	"git.daviestechlabs.io/daviestechlabs/handler-base/clients"
 	"git.daviestechlabs.io/daviestechlabs/handler-base/config"
 	"git.daviestechlabs.io/daviestechlabs/handler-base/handler"
+	"git.daviestechlabs.io/daviestechlabs/handler-base/messages"
+	"git.daviestechlabs.io/daviestechlabs/handler-base/natsutil"
 )
 
 func main() {
@@ -42,31 +43,47 @@ func main() {
 
 	h := handler.New("voice.request", cfg)
 
-	h.OnMessage(func(ctx context.Context, msg *nats.Msg, data map[string]any) (map[string]any, error) {
-		requestID := strVal(data, "request_id", "unknown")
-		audioB64 := strVal(data, "audio", "")
-		language := strVal(data, "language", sttLanguage)
-		collection := strVal(data, "collection", ragCollection)
+	h.OnTypedMessage(func(ctx context.Context, msg *nats.Msg) (any, error) {
+		req, err := natsutil.Decode[messages.VoiceRequest](msg.Data)
+		if err != nil {
+			return &messages.VoiceResponse{Error: "Invalid request encoding"}, nil
+		}
+
+		requestID := req.RequestID
+		if requestID == "" {
+			requestID = "unknown"
+		}
+		language := req.Language
+		if language == "" {
+			language = sttLanguage
+		}
+		collection := req.Collection
+		if collection == "" {
+			collection = ragCollection
+		}
 
 		slog.Info("processing voice request", "request_id", requestID)
 
-		// 1. Decode audio
-		audioBytes, err := base64.StdEncoding.DecodeString(audioB64)
-		if err != nil {
-			return map[string]any{"request_id": requestID, "error": "Invalid audio encoding"}, nil
+		errResp := func(msg string) (any, error) {
+			return &messages.VoiceResponse{RequestID: requestID, Error: msg}, nil
+		}
+
+		// 1. Audio arrives as raw bytes — no base64 decode needed
+		if len(req.Audio) == 0 {
+			return errResp("No audio data")
 		}
 
 		// 2. Transcribe audio → text
-		transcription, err := stt.Transcribe(ctx, audioBytes, language)
+		transcription, err := stt.Transcribe(ctx, req.Audio, language)
 		if err != nil {
 			slog.Error("STT failed", "error", err)
-			return map[string]any{"request_id": requestID, "error": "Transcription failed"}, nil
+			return errResp("Transcription failed")
 		}
 
 		query := strings.TrimSpace(transcription.Text)
 		if query == "" {
 			slog.Warn("empty transcription", "request_id", requestID)
-			return map[string]any{"request_id": requestID, "error": "Could not transcribe audio"}, nil
+			return errResp("Could not transcribe audio")
 		}
 
 		slog.Info("transcribed", "text", truncate(query, 50))
@@ -75,7 +92,7 @@ func main() {
 		embedding, err := embeddings.EmbedSingle(ctx, query)
 		if err != nil {
 			slog.Error("embedding failed", "error", err)
-			return map[string]any{"request_id": requestID, "error": "Embedding failed"}, nil
+			return errResp("Embedding failed")
 		}
 
 		// 4. Search Milvus for context (placeholder — requires Milvus SDK)
@@ -83,23 +100,25 @@ func main() {
 		_ = collection
 		_ = embedding
 		_ = ragTopK
-		var documents []map[string]any // Milvus results placeholder
+		type docResult struct {
+			Document string
+			Score    float64
+		}
+		var documents []docResult // Milvus results placeholder
 
 		// 5. Rerank documents
 		if len(documents) > 0 {
 			texts := make([]string, len(documents))
 			for i, d := range documents {
-				if t, ok := d["text"].(string); ok {
-					texts[i] = t
-				}
+				texts[i] = d.Document
 			}
 			reranked, err := reranker.Rerank(ctx, query, texts, ragRerankTopK)
 			if err != nil {
 				slog.Error("rerank failed", "error", err)
 			} else {
-				documents = make([]map[string]any, len(reranked))
+				documents = make([]docResult, len(reranked))
 				for i, r := range reranked {
-					documents[i] = map[string]any{"document": r.Document, "score": r.Score}
+					documents[i] = docResult{Document: r.Document, Score: r.Score}
 				}
 			}
 		}
@@ -107,9 +126,7 @@ func main() {
 		// 6. Build context
 		var contextParts []string
 		for _, d := range documents {
-			if t, ok := d["document"].(string); ok {
-				contextParts = append(contextParts, t)
-			}
+			contextParts = append(contextParts, d.Document)
 		}
 		contextText := strings.Join(contextParts, "\n\n")
 
@@ -117,47 +134,40 @@ func main() {
 		responseText, err := llm.Generate(ctx, query, contextText, "")
 		if err != nil {
 			slog.Error("LLM generation failed", "error", err)
-			return map[string]any{"request_id": requestID, "error": "Generation failed"}, nil
+			return errResp("Generation failed")
 		}
 
-		// 8. Synthesize speech
-		responseAudioBytes, err := tts.Synthesize(ctx, responseText, ttsLanguage, "")
+		// 8. Synthesize speech — response audio is raw bytes
+		responseAudio, err := tts.Synthesize(ctx, responseText, ttsLanguage, "")
 		if err != nil {
 			slog.Error("TTS failed", "error", err)
-			return map[string]any{"request_id": requestID, "error": "Speech synthesis failed"}, nil
+			return errResp("Speech synthesis failed")
 		}
-		responseAudioB64 := base64.StdEncoding.EncodeToString(responseAudioBytes)
 
-		// Build response
-		result := map[string]any{
-			"request_id": requestID,
-			"response":   responseText,
-			"audio":      responseAudioB64,
+		// Build typed response
+		result := &messages.VoiceResponse{
+			RequestID: requestID,
+			Response:  responseText,
+			Audio:     responseAudio,
 		}
 
 		if includeTranscription {
-			result["transcription"] = query
+			result.Transcription = query
 		}
 
 		if includeSources && len(documents) > 0 {
-			sources := make([]map[string]any, 0, 3)
-			for i, d := range documents {
-				if i >= 3 {
-					break
+			limit := 3
+			if len(documents) < limit {
+				limit = len(documents)
 			}
-				text := ""
-				if t, ok := d["document"].(string); ok && len(t) > 200 {
-					text = t[:200]
-				} else if t, ok := d["document"].(string); ok {
-					text = t
+			result.Sources = make([]messages.DocumentSource, limit)
+			for i := 0; i < limit; i++ {
+				text := documents[i].Document
+				if len(text) > 200 {
+					text = text[:200]
 				}
-				score := 0.0
-				if s, ok := d["score"].(float64); ok {
-					score = s
+				result.Sources[i] = messages.DocumentSource{Text: text, Score: documents[i].Score}
 			}
-				sources = append(sources, map[string]any{"text": text, "score": score})
-			}
-			result["sources"] = sources
 		}
 
 		// Publish to response subject
@@ -176,24 +186,6 @@ func main() {
 
 // Helpers
 
-func strVal(m map[string]any, key, fallback string) string {
-	if v, ok := m[key]; ok {
-		if s, ok := v.(string); ok {
-			return s
-		}
-	}
-	return fallback
-}
-
-func boolVal(m map[string]any, key string, fallback bool) bool {
-	if v, ok := m[key]; ok {
-		if b, ok := v.(bool); ok {
-			return b
-		}
-	}
-	return fallback
-}
-
 func getEnv(key, fallback string) string {
 	if v := os.Getenv(key); v != "" {
 		return v

main_test.go

@@ -2,25 +2,59 @@ package main
 
 import (
 	"testing"
+
+	"git.daviestechlabs.io/daviestechlabs/handler-base/messages"
+	"git.daviestechlabs.io/daviestechlabs/handler-base/natsutil"
+	"github.com/vmihailenco/msgpack/v5"
 )
 
-func TestStrVal(t *testing.T) {
-	m := map[string]any{"key": "value"}
-	if got := strVal(m, "key", ""); got != "value" {
-		t.Errorf("strVal(key) = %q", got)
+func TestVoiceRequestDecode(t *testing.T) {
+	req := messages.VoiceRequest{
+		RequestID:  "req-123",
+		Audio:      []byte{0x01, 0x02, 0x03},
+		Language:   "en",
+		Collection: "docs",
 	}
-	if got := strVal(m, "missing", "def"); got != "def" {
-		t.Errorf("strVal(missing) = %q", got)
+	data, err := msgpack.Marshal(&req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	decoded, err := natsutil.Decode[messages.VoiceRequest](data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if decoded.RequestID != "req-123" {
+		t.Errorf("RequestID = %q", decoded.RequestID)
+	}
+	if len(decoded.Audio) != 3 {
+		t.Errorf("Audio len = %d", len(decoded.Audio))
 	}
 }
 
-func TestBoolVal(t *testing.T) {
-	m := map[string]any{"flag": true}
-	if got := boolVal(m, "flag", false); !got {
-		t.Error("expected true")
+func TestVoiceResponseRoundtrip(t *testing.T) {
+	resp := messages.VoiceResponse{
+		RequestID:     "req-456",
+		Response:      "It is sunny today.",
+		Audio:         make([]byte, 8000),
+		Transcription: "What is the weather?",
+		Sources:       []messages.DocumentSource{{Text: "weather doc", Score: 0.9}},
 	}
-	if got := boolVal(m, "missing", false); got {
-		t.Error("expected false fallback")
+	data, err := msgpack.Marshal(&resp)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var got messages.VoiceResponse
+	if err := msgpack.Unmarshal(data, &got); err != nil {
+		t.Fatal(err)
+	}
+	if got.Response != "It is sunny today." {
+		t.Errorf("Response = %q", got.Response)
+	}
+	if len(got.Audio) != 8000 {
+		t.Errorf("Audio len = %d", len(got.Audio))
+	}
+	if len(got.Sources) != 1 || got.Sources[0].Text != "weather doc" {
+		t.Errorf("Sources = %v", got.Sources)
 	}
 }