perf: optimize request metadata extraction and disabled field filtering (#5009)

* perf: optimize request metadata extraction and disabled field filtering

* perf: optimize stream usage estimation path

relay/common/override_test.go

@@ -2054,6 +2054,17 @@ func TestRemoveDisabledFieldsDefaultFiltering(t *testing.T) {
 	assertJSONEqual(t, `{"cache_control":{"type":"ephemeral"},"store":true}`, string(out))
 }
 
+func TestRemoveDisabledFieldsNoControlledFieldsKeepsBody(t *testing.T) {
+	input := `{"model":"gpt-4o","messages":[{"role":"user","content":"hi"}]}`
+	settings := dto.ChannelOtherSettings{}
+
+	out, err := RemoveDisabledFields([]byte(input), settings, false)
+	if err != nil {
+		t.Fatalf("RemoveDisabledFields returned error: %v", err)
+	}
+	require.Equal(t, input, string(out))
+}
+
 func TestRemoveDisabledFieldsAllowInferenceGeo(t *testing.T) {
 	input := `{
 		"inference_geo":"eu",

relay/common/relay_info.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/gorilla/websocket"
+	"github.com/tidwall/gjson"
 )
 
 type ThinkingContentInfo struct {
@@ -785,6 +786,9 @@ func RemoveDisabledFields(jsonData []byte, channelOtherSettings dto.ChannelOther
 	if model_setting.GetGlobalSettings().PassThroughRequestEnabled || channelPassThroughEnabled {
 		return jsonData, nil
 	}
+	if !hasRemovableDisabledField(jsonData, channelOtherSettings) {
+		return jsonData, nil
+	}
 
 	var data map[string]interface{}
 	if err := common.Unmarshal(jsonData, &data); err != nil {
@@ -851,6 +855,25 @@ func RemoveDisabledFields(jsonData []byte, channelOtherSettings dto.ChannelOther
 	return jsonDataAfter, nil
 }
 
+func hasRemovableDisabledField(jsonData []byte, channelOtherSettings dto.ChannelOtherSettings) bool {
+	values := gjson.GetManyBytes(
+		jsonData,
+		"service_tier",
+		"inference_geo",
+		"speed",
+		"store",
+		"safety_identifier",
+		"stream_options.include_obfuscation",
+	)
+
+	return (!channelOtherSettings.AllowServiceTier && values[0].Exists()) ||
+		(!channelOtherSettings.AllowInferenceGeo && values[1].Exists()) ||
+		(!channelOtherSettings.AllowSpeed && values[2].Exists()) ||
+		(channelOtherSettings.DisableStore && values[3].Exists()) ||
+		(!channelOtherSettings.AllowSafetyIdentifier && values[4].Exists()) ||
+		(!channelOtherSettings.AllowIncludeObfuscation && values[5].Exists())
+}
+
 // RemoveGeminiDisabledFields removes disabled fields from Gemini request JSON data
 // Currently supports removing functionResponse.id field which Vertex AI does not support
 func RemoveGeminiDisabledFields(jsonData []byte) ([]byte, error) {