feat: add MCP SSE stateful session load balancer support (#2818)

test/e2e/conformance/tests/ingress-loadbalance-mcp-sse.go

@@ -0,0 +1,67 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tests
+
+import (
+	"testing"
+
+	"github.com/alibaba/higress/test/e2e/conformance/utils/envoy"
+	"github.com/alibaba/higress/test/e2e/conformance/utils/suite"
+)
+
+func init() {
+	Register(IngressLoadBalanceMcpSse)
+}
+
+var IngressLoadBalanceMcpSse = suite.ConformanceTest{
+	ShortName:   "IngressLoadBalanceMcpSse",
+	Description: "The Envoy config should contain MCP SSE stateful session filter when load-balance annotation is set to mcp-sse",
+	Manifests:   []string{"tests/ingress-loadbalance-mcp-sse.yaml"},
+	Features:    []suite.SupportedFeature{suite.EnvoyConfigConformanceFeature},
+	Test: func(t *testing.T, suite *suite.ConformanceTestSuite) {
+		testCases := []struct {
+			name           string
+			envoyAssertion []envoy.Assertion
+		}{
+			{
+				name: "MCP SSE stateful session global filter should be added",
+				envoyAssertion: []envoy.Assertion{
+					{
+						Path:            "configs.#.dynamic_listeners.#.active_state.listener.filter_chains.#.filters.#.typed_config.http_filters",
+						CheckType:       envoy.CheckTypeMatch,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"name": "envoy.filters.http.mcp_sse_stateful_session",
+							"typed_config": map[string]interface{}{
+								"@type":    "type.googleapis.com/udpa.type.v1.TypedStruct",
+								"type_url": "type.googleapis.com/envoy.extensions.filters.http.mcp_sse_stateful_session.v3alpha.McpSseStatefulSession",
+							},
+						},
+					},
+				},
+			},
+			// TODO: add per router filter check
+		}
+
+		t.Run("Ingress LoadBalance MCP SSE", func(t *testing.T) {
+			for _, testcase := range testCases {
+				t.Logf("Test Case %s", testcase.name)
+				for _, assertion := range testcase.envoyAssertion {
+					envoy.AssertEnvoyConfig(t, suite.TimeoutConfig, assertion)
+				}
+			}
+		})
+	},
+}

test/e2e/conformance/tests/ingress-loadbalance-mcp-sse.yaml

@@ -0,0 +1,34 @@
+# Copyright (c) 2022 Alibaba Group Holding Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: higress-conformance-infra-ingress-loadbalance-mcp-sse-test
+  namespace: higress-conformance-infra
+  annotations:
+    higress.io/load-balance: "mcp-sse"
+spec:
+  ingressClassName: higress
+  rules:
+    - host: "mcp-sse.example.com"
+      http:
+        paths:
+          - pathType: Prefix
+            path: "/api"
+            backend:
+              service:
+                name: infra-backend-v3
+                port:
+                  number: 8080