// limitations under the License.

package echo

// WorkloadClass is the class of workload in the echo instance
type WorkloadClass = string

const (
	Proxyless   WorkloadClass = "proxyless"
	VM          WorkloadClass = "vm"
	Sotw        WorkloadClass = "sotw"
	TProxy      WorkloadClass = "tproxy"
	Naked       WorkloadClass = "naked"
	External    WorkloadClass = "external"

apiVersion: release-notes/v2
kind: feature
area: traffic-management
releaseNotes:
  - |

# grpc-echo

This sample demonstrates Istio's Proxyless gRPC support with a special injection template `grpc-agent`.
The template injects the `istio-proxy` sidecar, but the sidecar will only run `pilot-agent` and not envoy.

See the [gRPC xDS feature status](https://github.com/grpc/grpc/blob/master/doc/grpc_xds_features.md) for more

        module.pom.expectDownload()
        module.artifact.expectDownload()

        when:
        executer.withArguments(
                "-Dorg.gradle.s3.endpoint=${server.uri}",
                "-Dhttp.proxyHost=localhost",
                "-Dhttp.proxyPort=${proxyServer.port}",
                "-Dhttp.nonProxyHosts=foo",
                "-Dhttp.proxyUser=proxyUser",
                "-Dhttp.proxyPassword=proxyPassword"
        )

        given:
        proxyServer.start()

        // Note that the HTTPS protocol handler uses the same nonProxyHosts property as the HTTP protocol.
        file("gradle.properties") << """
    systemProp.https.proxyHost=localhost
    systemProp.https.proxyPort=${proxyServer.port}
    systemProp.http.nonProxyHosts=
"""
        server.expect(server.head("/$TEST_DISTRIBUTION_URL"))
        prepareWrapper(getAuthenticatedBaseUrl())

        }
    }

    void configureProxyHost(GradleExecuter executer, String proxyScheme) {
        assert port > 0
        executer.withArgument("-D${proxyScheme}.proxyHost=localhost")
        executer.withArgument("-D${proxyScheme}.proxyPort=${port}")
        // use proxy even when accessing localhost
        executer.withArgument("-Dhttp.nonProxyHosts=")
    }

// using the generic structures. "Classical" CDS/LDS/RDS/EDS use separate logic -
// this is used for the API-based LDS and generic messages.

var log = istiolog.RegisterScope("grpcgen", "xDS Generator for Proxyless gRPC")

type GrpcConfigGenerator struct{}

func clusterKey(hostname string, port int) string {
	return subsetClusterKey("", hostname, port)
}

func subsetClusterKey(subset, hostname string, port int) string {

	CSvc             = "c"
	DSvc             = "d"
	ESvc             = "e"
	TproxySvc        = "tproxy"
	VMSvc            = "vm"
	HeadlessSvc      = "headless"
	StatefulSetSvc   = "statefulset"
	ProxylessGRPCSvc = "proxyless-grpc"
	NakedSvc         = "naked"
	SotwSvc          = "sotw"
	WaypointSvc      = "waypoint"
	CapturedSvc      = "captured"
)

// EchoNamespace contains the echo instances for a single namespace.

func (r *Runner) EnvoyGet(namespace, pod, url string, dryRun bool) (string, error) {
	if dryRun {
		return fmt.Sprintf("Dry run: would be running client.EnvoyDo(%s, %s, %s)", pod, namespace, url), nil
	}
	task := fmt.Sprintf("ProxyGet %s/%s:%s", namespace, pod, url)
	r.addRunningTask(task)
	defer r.removeRunningTask(task)
	out, err := r.Client.EnvoyDo(context.TODO(), pod, namespace, "GET", url)
	return string(out), err
}