Gateway API 将是 Kubernetes 中流量管理的未来吗？

// An Ingress is a way to give services externally-reachable urls. Each Ingress is a
// collection of rules that allow inbound connections to reach the endpoints defined by
// a backend.
type Ingress struct {
	unversioned.TypeMeta `json:",inline"`
	// Standard object's metadata.
	// More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#metadata
	v1.ObjectMeta `json:"metadata,omitempty"`

	// Spec is the desired state of the Ingress.
	// More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#spec-and-status
	Spec IngressSpec `json:"spec,omitempty"`

	// Status is the current state of the Ingress.
	// More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#spec-and-status
	Status IngressStatus `json:"status,omitempty"`
}

// IngressSpec describes the Ingress the user wishes to exist.
type IngressSpec struct {
	// TODO: Add the ability to specify load-balancer IP just like what Service has already done?
	// A list of rules used to configure the Ingress.
	// http://<host>:<port>/<path>?<searchpart> -> IngressBackend
	// Where parts of the url conform to RFC 1738.
	Rules []IngressRule `json:"rules"`
}

// IngressRule represents the rules mapping the paths under a specified host to the related backend services.
type IngressRule struct {
	// Host is the fully qualified domain name of a network host, or its IP
	// address as a set of four decimal digit groups separated by ".".
	// Conforms to RFC 1738.
	Host string `json:"host,omitempty"`

	// Paths describe a list of load-balancer rules under the specified host.
	Paths []IngressPath `json:"paths"`
}

// IngressPath associates a path regex with an IngressBackend.
// Incoming urls matching the Path are forwarded to the Backend.
type IngressPath struct {
	// Path is a regex matched against the url of an incoming request.
	Path string `json:"path,omitempty"`

	// Define the referenced service endpoint which the traffic will be forwarded to.
	Backend IngressBackend `json:"backend"`
}

// IngressBackend describes all endpoints for a given Service, port and protocol.
type IngressBackend struct {
	// Specifies the referenced service.
	ServiceRef v1.LocalObjectReference `json:"serviceRef"`

	// Specifies the port of the referenced service.
	ServicePort util.IntOrString `json:"servicePort,omitempty"`

	// Specifies the protocol of the referenced service.
	Protocol v1.Protocol `json:"protocol,omitempty"`
}

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/use-regex: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: rewrite
  namespace: default
spec:
  ingressClassName: nginx
  rules:
  - host: rewrite.bar.com
    http:
      paths:
      - path: /something(/|$)(.*)
        pathType: ImplementationSpecific
        backend:
          service:
            name: http-svc
            port: 
              number: 80

➜  ~ kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.43.0.1    <none>        443/TCP   9d
➜  ~ kubectl get endpoints
NAME         ENDPOINTS              AGE
kubernetes   131.83.127.119:6443   9d
➜  ~ kubectl get endpointslices
NAME         ADDRESSTYPE   PORTS   ENDPOINTS         AGE
kubernetes   IPv4          6443    131.83.127.119   9d

apiVersion: kuma.io/v1alpha1
kind: TrafficRoute
mesh: default
metadata:
  name: api-split
spec:
  sources:
    - match:
        kuma.io/service: frontend_default_svc_80
  destinations:
    - match:
        kuma.io/service: backend_default_svc_80
  conf:
    http:
    - match:
        path:
          prefix: "/api"
      split:
      - weight: 90
        destination:
          kuma.io/service: backend_default_svc_80
          version: '1.0'
      - weight: 10
        destination:
          kuma.io/service: backend_default_svc_80
          version: '2.0'
    destination: # default rule is applied when endpoint does not match any rules in http section
      kuma.io/service: backend_default_svc_80
      version: '1.0'

apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: internet
spec:
  controllerName: "example.net/gateway-controller"
  parametersRef:
    group: example.net/v1alpha1
    kind: Config
    name: internet-gateway-config
---
apiVersion: example.net/v1alpha1
kind: Config
metadata:
  name: internet-gateway-config
spec:
  ip-address-pool: internet-vips

apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: kong-http
spec:
  gatewayClassName: kong
  listeners:
  - name: proxy
    port: 80
    protocol: HTTP

apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: echo
spec:
  parentRefs:
  - name: kong
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /echo
    backendRefs:
    - name: echo
      kind: Service
      port: 1027

apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: http-filter-rewrite
spec:
  hostnames:
    - rewrite.example
  rules:
    - filters:
        - type: URLRewrite
          urlRewrite:
            hostname: elsewhere.example
            path:
              type: ReplacePrefixMatch
              replacePrefixMatch: /fennel
      backendRefs:
        - name: example-svc
          weight: 1
          port: 80

apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: internet
spec:
  controllerName: "example.net/gateway-controller"
  parametersRef:
    group: example.net/v1alpha1
    kind: Config
    name: internet-gateway-config
---
apiVersion: example.net/v1alpha1
kind: Config
metadata:
  name: internet-gateway-config
spec:
  ip-address-pool: internet-vips