Add benchmarks

Author: sesposito

server/runtime_javascript_test.go

@@ -15,12 +15,12 @@
 package server
 
 import (
-	"strings"
-	"testing"
-
+	"encoding/json"
 	"github.com/dop251/goja"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zaptest/observer"
+	"strings"
+	"testing"
 )
 
 func TestJsObjectFreeze(t *testing.T) {
@@ -112,3 +112,61 @@ m.get('a');
 		}
 	})
 }
+
+const data = `{"title_data":{"ads_config": [1,2,3]}}`
+
+// go test -run=XXX -bench=BenchmarkParse ./...
+// go test -run=XXX -bench=BenchmarkParse ./... -benchmem
+func BenchmarkParseJsonGo(b *testing.B) {
+	vm := goja.New()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		v, err := jsJsonParse(vm, data)
+		if err != nil {
+			b.Fatal(err)
+		}
+		vm.Set("data", v)
+		vm.RunString(`data.foo = []; data.foo.push(3)`)
+	}
+}
+func BenchmarkParseJsonGoja(b *testing.B) {
+	vm := goja.New()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		var out map[string]any
+		if err := json.Unmarshal([]byte(data), &out); err != nil {
+			b.Fatal(err)
+		}
+		pointerizeSlices(out)
+		vm.Set("data", out)
+		vm.RunString(`data.foo = []; data.foo.push(3)`)
+	}
+}
+
+// pointerizeSlices recursively walks a map[string]interface{} and replaces any []interface{} references for *[]interface{}.
+// This is needed to allow goja operations that resize a JS wrapped Go slice to work as expected, otherwise
+// such operations won't reflect on the original slice as it would be passed by value and not by reference.
+func pointerizeSlices(m interface{}) {
+	switch i := m.(type) {
+	case map[string]interface{}:
+		for k, v := range i {
+			if s, ok := v.([]interface{}); ok {
+				i[k] = &s
+				pointerizeSlices(&s)
+			}
+			if mi, ok := v.(map[string]interface{}); ok {
+				pointerizeSlices(mi)
+			}
+		}
+	case *[]interface{}:
+		for idx, v := range *i {
+			if s, ok := v.([]interface{}); ok {
+				(*i)[idx] = &s
+				pointerizeSlices(&s)
+			}
+			if mi, ok := v.(map[string]interface{}); ok {
+				pointerizeSlices(mi)
+			}
+		}
+	}
+}