"time"

	"go.uber.org/atomic"

	"istio.io/istio/pkg/env"
	"istio.io/istio/pkg/log"
)

// Define experimental features here.
var (
	// FilterGatewayClusterConfig controls if a subset of clusters(only those required) should be pushed to gateways
	FilterGatewayClusterConfig = env.Register("PILOT_FILTER_GATEWAY_CLUSTER_CONFIG", false,

				t.Fatalf("Got needs push = %v, expected %v", got, tt.want)
			}
		})
	}

	// test for gateway proxy dependencies with PILOT_FILTER_GATEWAY_CLUSTER_CONFIG enabled.
	test.SetForTest(t, &features.FilterGatewayClusterConfig, true)
	test.SetForTest(t, &features.JwksFetchMode, jwt.Envoy)

	const (
		fooSvc       = "foo"
		extensionSvc = "extension"
		jwksSvc      = "jwks"
	)

func (configgen *ConfigGeneratorImpl) BuildClusters(proxy *model.Proxy, req *model.PushRequest) ([]*discovery.Resource, model.XdsLogDetails) {
	// In Sotw, we care about all services.
	var services []*model.Service
	if features.FilterGatewayClusterConfig && proxy.Type == model.Router {
		services = req.Push.GatewayServices(proxy)
	} else {
		services = proxy.SidecarScope.Services()
	}
	return configgen.buildClusters(proxy, req, services)
}