feat(gateway): add initial Gateway API support to Kubernetes

[michaelbeaumont]

Summary

Adds support for creating gatewayapi.Gateways and gatewayapi.HTTPRoutes in k8s. Upon creating a Gateway and GatewayClass, a kuma-dp deployment is created which uses a Dataplane with type: BUILTIN, created, like all dataplanes in k8s, by the Pod controller.

For example:

---
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: GatewayClass
metadata:
  name: kuma
spec:
  controllerName: "gateways.kuma.io/controller"
---
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: Gateway
metadata:
  name: foo-gateway
  namespace: default
spec:
  gatewayClassName: 'kuma'
  listeners:
  - name: prod-web
    port: 80
    protocol: HTTP
---
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: HTTPRoute
metadata:
  name: foo-gateway
  namespace: default
spec:
  parentRefs:
  - name: foo-gateway
    sectionName: prod-web
  rules:
    - matches:
      - path:
          type: PathPrefix
          value: "/"
      backendRefs:
        - name: httpbin
          port: 8000

$ kubectl apply -f https://raw.githubusercontent.com/istio/istio/master/samples/httpbin/httpbin.yaml
$ IP=$(kubectl get gateways.gateway.networking.k8s.io foo-gateway -o json | jq -r '.status.addresses[0].value')
$ curl -i "$IP/get"
HTTP/1.1 200 OK
server: Kuma Gateway
date: Tue, 09 Nov 2021 12:36:49 GMT
content-type: application/json
content-length: 232
access-control-allow-origin: *
access-control-allow-credentials: true
x-envoy-upstream-service-time: 1

{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Host": "192.168.49.2",
    "User-Agent": "curl/7.79.1",
    "X-Envoy-Expected-Rq-Timeout-Ms": "15000"
  },
  "origin": "127.0.0.1",
  "url": "http://192.168.49.2/get"
}

TODO

• annotation to Gateway resource to enable behavior check for GatewayClass
• add gateway Service creation
• gatewayapi object support
• ExternalService backendRefs

Post merge TODO

• separate packge for converting from k8s to kuma types with tests

Testing

• Unit tests
• E2E tests
• Manual testing on Kubernetes

[codecov-commenter]

Codecov Report

Merging #3109 (e4cfc43) into master (ff7a55f) will decrease coverage by 0.39%.
The diff coverage is 33.11%.

@@            Coverage Diff             @@
##           master    #3109      +/-   ##
==========================================
- Coverage   52.15%   51.76%   -0.40%     
==========================================
  Files         938      945       +7     
  Lines       54587    55001     +414     
==========================================
  Hits        28470    28470              
- Misses      23886    24306     +420     
+ Partials     2231     2225       -6     

Impacted Files	Coverage Δ
api/mesh/v1alpha1/dataplane_helpers.go	81.74% <ø> (ø)
pkg/plugins/bootstrap/k8s/scheme.go	23.07% <0.00%> (-4.20%)	⬇️
...ns/runtime/k8s/controllers/gatewayapi/condition.go	0.00% <0.00%> (ø)
...ns/runtime/k8s/controllers/gatewayapi/converter.go	0.00% <0.00%> (ø)
...s/runtime/k8s/controllers/gatewayapi/deployment.go	0.00% <0.00%> (ø)
...e/k8s/controllers/gatewayapi/gateway_controller.go	0.00% <0.00%> (ø)
...8s/controllers/gatewayapi/http_route_controller.go	0.00% <0.00%> (ø)
pkg/plugins/runtime/k8s/plugin.go	1.11% <0.00%> (-0.02%)	⬇️
pkg/plugins/runtime/k8s/plugin_gateway.go	0.00% <0.00%> (ø)
pkg/plugins/runtime/k8s/containers/factory.go	96.57% <96.57%> (ø)
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ff7a55f...e4cfc43. Read the comment docs.

[jpeach]

Part-way through :)

[jpeach]

I'm happy to land this and deal with the install and deployment changes later, if that's your preference :)