add otel module based on uptrace-go

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

otel/internal_test.go

@@ -0,0 +1,28 @@
+package otel
+
+import (
+	"context"
+	"math"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIDGenerator(t *testing.T) {
+	ctx := context.Background()
+	gen := newIDGenerator()
+
+	traceID1, spanID1 := gen.NewIDs(ctx)
+	traceID2, spanID2 := gen.NewIDs(ctx)
+	require.NotEqual(t, traceID1, traceID2)
+	require.NotEqual(t, spanID1, spanID2)
+
+	spanID3 := gen.NewSpanID(ctx, traceID1)
+	require.NotEqual(t, spanID1, spanID3)
+}
+
+func TestSpanPrecision(t *testing.T) {
+	dur := time.Duration(math.MaxUint32) * time.Duration(spanIDPrec)
+	require.Equal(t, "1193h2m47.295s", dur.String())
+}