package log_test import ( "context" "fmt" "io" "gitoa.ru/go-4devs/log" "gitoa.ru/go-4devs/log/field" "gitoa.ru/go-4devs/log/handler/otel" sdktrace "go.opentelemetry.io/otel/sdk/trace" "go.opentelemetry.io/otel/trace" ) func ExampleNew_withTrace() { logger := log.New(log.WithStdout()).With(otel.Middleware()) sctx, span := startSpan(ctx) logger.Err(sctx, "log logrus") logger.ErrKV(sctx, "log logrus kv", field.Int("int", 42)) logger.ErrKVs(sctx, "log logrus kv sugar", "err", io.EOF) span.End() // Output: // msg="log logrus" // msg="log logrus kv" int=42 // msg="log logrus kv sugar" err=EOF // event: log logrus, SeverityText = ERROR, SeverityNumber = 17 // event: log logrus kv, SeverityText = ERROR, SeverityNumber = 17, int = 42 // event: log logrus kv sugar, SeverityText = ERROR, SeverityNumber = 17, err = EOF } func startSpan(ctx context.Context) (context.Context, trace.Span) { tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter{})) return tp.Tracer("logger").Start(ctx, "operation") } type exporter struct{} func (e exporter) Shutdown(_ context.Context) error { return nil } func (e exporter) ExportSpans(ctx context.Context, spanData []*sdktrace.SpanSnapshot) error { for _, data := range spanData { for _, events := range data.MessageEvents { fmt.Print("event: ", events.Name) for _, attr := range events.Attributes { fmt.Printf(", %v = %v", attr.Key, attr.Value.AsInterface()) } fmt.Print("\n") } } return nil }