first commit

pkg/tracing/otel.go

@@ -0,0 +1,35 @@
+package tracing
+
+import (
+	"context"
+	"log/slog"
+
+	"go.opentelemetry.io/otel/trace"
+)
+
+type OtelContextHandler struct {
+	Handler slog.Handler
+}
+
+func (h OtelContextHandler) Handle(ctx context.Context, r slog.Record) error {
+	if span := trace.SpanFromContext(ctx); span.SpanContext().IsValid() {
+		sc := span.SpanContext()
+		r.AddAttrs(
+			slog.String("trace_id", sc.TraceID().String()),
+			slog.String("span_id", sc.SpanID().String()),
+		)
+	}
+	return h.Handler.Handle(ctx, r)
+}
+
+func (h OtelContextHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return h.Handler.Enabled(ctx, level)
+}
+
+func (h OtelContextHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return OtelContextHandler{Handler: h.Handler.WithAttrs(attrs)}
+}
+
+func (h OtelContextHandler) WithGroup(name string) slog.Handler {
+	return OtelContextHandler{Handler: h.Handler.WithGroup(name)}
+}