## Proxy Configuration

Istiod's primary role - and most code - is to dynamically configure proxies (Envoy sidecars and ingress, gRPC, ztunnel, and more). This roughly consists of 3 parts:
1. Config ingestion (inputs to the system)
1. Config translation
1. Config serving (XDS)

### Config Ingestion

		Address: net.IPNet{
			IP: fakeIP,
		},
		Gateway: fakeGW,
	}
)

func TestPushCNIAddEventSucceed(t *testing.T) {
	// Fake out a test HTTP server and use that instead of a real HTTP server over gRPC to validate  req/resp flows
	testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
		res.WriteHeader(http.StatusOK)
		res.Write([]byte("server happy"))
	}))

}

message GRPCAction {
  // Port number of the gRPC service. Number must be in the range 1 to 65535.
  optional int32 port = 1;

  // Service is the name of the service to place in the gRPC HealthCheckRequest
  // (see https://github.com/grpc/grpc/blob/master/doc/health-checking.md).
  //
  // If this is not specified, the default behavior is defined by gRPC.
  // +optional
  // +default=""

      "state": "Unavailable: the identity is no longer needed",
      "certChain": []
    },
    {
      "identity": "spiffe://cluster.local/ns/istio-system/sa/istiod",
      "state": "Unavailable: signing gRPC error (The service is currently unavailable): error trying to connect: TLS handshake failed: cert verification failed - unable to get local issuer certificate [CERTIFICATE_VERIFY_FAILED]",
      "certChain": []
    }
  ]

import (
	"bytes"
	"context"
	"fmt"
	"net/http"
	"strings"
	"testing"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
	"github.com/spf13/cobra"
	"google.golang.org/grpc"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/cli-runtime/pkg/resource"
	"k8s.io/client-go/rest/fake"
	cmdtesting "k8s.io/kubectl/pkg/cmd/testing"

    operator.istio.io/component: "Pilot"
    app: istiod
    istio: pilot
    release: {{ .Release.Name }}
spec:
  ports:
    - port: 15010
      name: grpc-xds # plaintext
      protocol: TCP
    - port: 15012
      name: https-dns # mTLS with k8s-signed cert
      protocol: TCP
    - port: 443
      name: https-webhook # validation and injection
      targetPort: 15017

// See the License for the specific language governing permissions and
// limitations under the License.

package cli

import (
	"context"
	"fmt"

	"google.golang.org/grpc/credentials"

	"istio.io/istio/pkg/kube"
)

type MockPortForwarder struct{}

func (m MockPortForwarder) Start() error {
	return nil
}

func (m MockPortForwarder) Address() string {

              }
             }
            ],
            "host_selection_retry_max_attempts": "5",
            "retriable_status_codes": [
             503
            ]
           },
           "max_grpc_timeout": "0s"
          },
          "metadata": {
           "filter_metadata": {
            "istio": {
             "config": "/apis/networking.istio.io/v1alpha3/namespaces/default/virtual-service/httpbin"

              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "expr": "sum(irate(envoy_cluster_upstream_cx_total{cluster_name=\"xds-grpc\"}[1m]))",
              "format": "time_series",
              "hide": false,
              "intervalFactor": 1,
              "legendFormat": "XDS Connections",
              "refId": "C"
            },

    # This is not helpful. The new function is not very usable and the current function will not be removed
    - linters:
        - staticcheck
      text: 'SA1019: grpc.Dial is deprecated: use NewClient instead'
    - linters:
        - staticcheck
      text: 'SA1019: grpc.DialContext is deprecated: use NewClient instead'
  # Independently from option `exclude` we use default exclude patterns,
  # it can be disabled by this option. To list all