Add Kubernetes Gateway Provider

Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com>

integration/fixtures/k8s/03-gateway.yml

@@ -0,0 +1,42 @@
+---
+kind: GatewayClass
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: my-gateway-class
+spec:
+  controller: traefik.io/gateway-controller
+
+---
+kind: Gateway
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: my-gateway
+  namespace: default
+spec:
+  gatewayClassName: my-gateway-class
+  listeners:
+    - protocol: HTTP
+      port: 8180
+      routes:
+        kind: HTTPRoute
+
+---
+kind: HTTPRoute
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: http-app-1
+  namespace: default
+  labels:
+    app: foo
+spec:
+  hostnames:
+    - "foo.com"
+  rules:
+    - matches:
+        - path:
+            type: Exact
+            value: /bar
+      forwardTo:
+        - serviceName: whoami
+          port: 80
+          weight: 1

integration/fixtures/k8s_gateway.toml

@@ -0,0 +1,22 @@
+[global]
+  checkNewVersion = false
+  sendAnonymousUsage = false
+
+[log]
+  level = "DEBUG"
+
+[api]
+  insecure = true
+
+[experimental]
+  kubernetesGateway = true
+
+[entryPoints]
+  [entryPoints.footcp]
+    address = ":8193"
+  [entryPoints.fooudp]
+    address = ":8190/udp"
+  [entryPoints.web]
+    address = ":8180"
+
+[providers.kubernetesGateway]

integration/k8s_test.go

@@ -108,6 +108,17 @@ func (s *K8sSuite) TestCRDLabelSelector(c *check.C) {
 	testConfiguration(c, "testdata/rawdata-crd-label-selector.json", "8000")
 }
 
+func (s *K8sSuite) TestGatewayConfiguration(c *check.C) {
+	cmd, display := s.traefikCmd(withConfigFile("fixtures/k8s_gateway.toml"))
+	defer display(c)
+
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer s.killCmd(cmd)
+
+	testConfiguration(c, "testdata/rawdata-gateway.json", "8080")
+}
+
 func testConfiguration(c *check.C, path, apiPort string) {
 	err := try.GetRequest("http://127.0.0.1:"+apiPort+"/api/entrypoints", 20*time.Second, try.BodyContains(`"name":"web"`))
 	c.Assert(err, checker.IsNil)

integration/testdata/rawdata-gateway.json

@@ -0,0 +1,117 @@
+{
+	"routers": {
+		"api@internal": {
+			"entryPoints": [
+				"traefik"
+			],
+			"service": "api@internal",
+			"rule": "PathPrefix(`/api`)",
+			"priority": 2147483646,
+			"status": "enabled",
+			"using": [
+				"traefik"
+			]
+		},
+		"dashboard@internal": {
+			"entryPoints": [
+				"traefik"
+			],
+			"middlewares": [
+				"dashboard_redirect@internal",
+				"dashboard_stripprefix@internal"
+			],
+			"service": "dashboard@internal",
+			"rule": "PathPrefix(`/`)",
+			"priority": 2147483645,
+			"status": "enabled",
+			"using": [
+				"traefik"
+			]
+		},
+		"default-http-app-1-my-gateway-web-1c0cf64bde37d9d0df06@kubernetesgateway": {
+			"entryPoints": [
+				"web"
+			],
+			"service": "default-http-app-1-my-gateway-web-1c0cf64bde37d9d0df06-wrr",
+			"rule": "Host(`foo.com`) \u0026\u0026 Path(`/bar`)",
+			"status": "enabled",
+			"using": [
+				"web"
+			]
+		}
+	},
+	"middlewares": {
+		"dashboard_redirect@internal": {
+			"redirectRegex": {
+				"regex": "^(http:\\/\\/(\\[[\\w:.]+\\]|[\\w\\._-]+)(:\\d+)?)\\/$",
+				"replacement": "${1}/dashboard/",
+				"permanent": true
+			},
+			"status": "enabled",
+			"usedBy": [
+				"dashboard@internal"
+			]
+		},
+		"dashboard_stripprefix@internal": {
+			"stripPrefix": {
+				"prefixes": [
+					"/dashboard/",
+					"/dashboard"
+				]
+			},
+			"status": "enabled",
+			"usedBy": [
+				"dashboard@internal"
+			]
+		}
+	},
+	"services": {
+		"api@internal": {
+			"status": "enabled",
+			"usedBy": [
+				"api@internal"
+			]
+		},
+		"dashboard@internal": {
+			"status": "enabled",
+			"usedBy": [
+				"dashboard@internal"
+			]
+		},
+		"default-http-app-1-my-gateway-web-1c0cf64bde37d9d0df06-wrr@kubernetesgateway": {
+			"weighted": {
+				"services": [
+					{
+						"name": "default-whoami-80",
+						"weight": 1
+					}
+				]
+			},
+			"status": "enabled",
+			"usedBy": [
+				"default-http-app-1-my-gateway-web-1c0cf64bde37d9d0df06@kubernetesgateway"
+			]
+		},
+		"default-whoami-80@kubernetesgateway": {
+			"loadBalancer": {
+				"servers": [
+					{
+						"url": "http://10.42.0.3:80"
+					},
+					{
+						"url": "http://10.42.0.7:80"
+					}
+				],
+				"passHostHeader": true
+			},
+			"status": "enabled",
+			"serverStatus": {
+				"http://10.42.0.3:80": "UP",
+				"http://10.42.0.7:80": "UP"
+			}
+		},
+		"noop@internal": {
+			"status": "enabled"
+		}
+	}
+}