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| 1 | +package a2a |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "net/http" |
| 6 | + "net/http/httptest" |
| 7 | + "testing" |
| 8 | + |
| 9 | + "go.opentelemetry.io/otel" |
| 10 | + "go.opentelemetry.io/otel/propagation" |
| 11 | + sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| 12 | + "go.opentelemetry.io/otel/sdk/trace/tracetest" |
| 13 | + semconv "go.opentelemetry.io/otel/semconv/v1.39.0" |
| 14 | + "go.opentelemetry.io/otel/trace" |
| 15 | + "k8s.io/apimachinery/pkg/types" |
| 16 | +) |
| 17 | + |
| 18 | +// mockHTTPReqHandler captures the request passed to Handle for inspection. |
| 19 | +type mockHTTPReqHandler struct { |
| 20 | + capturedReq *http.Request |
| 21 | +} |
| 22 | + |
| 23 | +func (m *mockHTTPReqHandler) Handle(_ context.Context, _ *http.Client, req *http.Request) (*http.Response, error) { |
| 24 | + m.capturedReq = req |
| 25 | + return &http.Response{StatusCode: http.StatusOK}, nil |
| 26 | +} |
| 27 | + |
| 28 | +func TestTraceInjectHandler_InjectsHeader(t *testing.T) { |
| 29 | + const rawTraceparent = "00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01" |
| 30 | + |
| 31 | + ctx := propagation.TraceContext{}.Extract( |
| 32 | + context.Background(), |
| 33 | + propagation.MapCarrier{"traceparent": rawTraceparent}, |
| 34 | + ) |
| 35 | + |
| 36 | + mock := &mockHTTPReqHandler{} |
| 37 | + h := &traceInjectHandler{next: mock} |
| 38 | + |
| 39 | + req := httptest.NewRequest(http.MethodPost, "/", nil) |
| 40 | + if _, err := h.Handle(ctx, nil, req); err != nil { |
| 41 | + t.Fatalf("unexpected error: %v", err) |
| 42 | + } |
| 43 | + |
| 44 | + got := mock.capturedReq.Header.Get("traceparent") |
| 45 | + if got == "" { |
| 46 | + t.Fatal("expected traceparent header on outgoing request, got none") |
| 47 | + } |
| 48 | + |
| 49 | + // The injected header must carry the same trace ID as the incoming context. |
| 50 | + outCtx := propagation.TraceContext{}.Extract(context.Background(), propagation.HeaderCarrier(mock.capturedReq.Header)) |
| 51 | + wantTraceID := trace.SpanContextFromContext(ctx).TraceID() |
| 52 | + gotTraceID := trace.SpanContextFromContext(outCtx).TraceID() |
| 53 | + if wantTraceID != gotTraceID { |
| 54 | + t.Errorf("trace ID: want %s, got %s", wantTraceID, gotTraceID) |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +func TestTraceInjectHandler_NoHeaderWhenNoTrace(t *testing.T) { |
| 59 | + mock := &mockHTTPReqHandler{} |
| 60 | + h := &traceInjectHandler{next: mock} |
| 61 | + |
| 62 | + req := httptest.NewRequest(http.MethodPost, "/", nil) |
| 63 | + if _, err := h.Handle(context.Background(), nil, req); err != nil { |
| 64 | + t.Fatalf("unexpected error: %v", err) |
| 65 | + } |
| 66 | + |
| 67 | + if got := mock.capturedReq.Header.Get("traceparent"); got != "" { |
| 68 | + t.Errorf("expected no traceparent header, got %q", got) |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +func TestA2ATracingMiddleware_SetsGenAIAttributes(t *testing.T) { |
| 73 | + exporter := tracetest.NewInMemoryExporter() |
| 74 | + tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter)) |
| 75 | + prev := otel.GetTracerProvider() |
| 76 | + otel.SetTracerProvider(tp) |
| 77 | + t.Cleanup(func() { |
| 78 | + otel.SetTracerProvider(prev) |
| 79 | + _ = tp.Shutdown(context.Background()) |
| 80 | + }) |
| 81 | + |
| 82 | + agentRef := types.NamespacedName{Namespace: "default", Name: "my-agent"} |
| 83 | + mw := newA2ATracingMiddleware(agentRef, semconv.GenAIProviderNameOpenAI) |
| 84 | + |
| 85 | + called := false |
| 86 | + inner := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 87 | + called = true |
| 88 | + w.WriteHeader(http.StatusOK) |
| 89 | + }) |
| 90 | + |
| 91 | + req := httptest.NewRequest(http.MethodPost, "/", nil) |
| 92 | + rr := httptest.NewRecorder() |
| 93 | + mw.Wrap(inner).ServeHTTP(rr, req) |
| 94 | + |
| 95 | + if !called { |
| 96 | + t.Fatal("inner handler was not called") |
| 97 | + } |
| 98 | + |
| 99 | + spans := exporter.GetSpans() |
| 100 | + if len(spans) != 1 { |
| 101 | + t.Fatalf("expected 1 span, got %d", len(spans)) |
| 102 | + } |
| 103 | + |
| 104 | + wantAttrs := map[string]string{ |
| 105 | + "gen_ai.operation.name": "invoke_agent", |
| 106 | + "gen_ai.provider.name": "openai", |
| 107 | + "gen_ai.agent.name": "my-agent", |
| 108 | + "gen_ai.agent.id": "default/my-agent", |
| 109 | + } |
| 110 | + gotAttrs := make(map[string]string) |
| 111 | + for _, a := range spans[0].Attributes { |
| 112 | + gotAttrs[string(a.Key)] = a.Value.AsString() |
| 113 | + } |
| 114 | + for k, want := range wantAttrs { |
| 115 | + if got := gotAttrs[k]; got != want { |
| 116 | + t.Errorf("attribute %s: want %q, got %q", k, want, got) |
| 117 | + } |
| 118 | + } |
| 119 | + |
| 120 | + if spans[0].Name != "invoke_agent" { |
| 121 | + t.Errorf("span name: want %q, got %q", "invoke_agent", spans[0].Name) |
| 122 | + } |
| 123 | +} |
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