fix(wasm): resolve stale route_name in wasm context after reroute (#3576)

Signed-off-by: jingze <daijingze.djz@alibaba-inc.com>

test/e2e/conformance/tests/go-wasm-reroute-match-rule.go

@@ -0,0 +1,101 @@
+// 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/v2/test/e2e/conformance/utils/http"
+	"github.com/alibaba/higress/v2/test/e2e/conformance/utils/suite"
+)
+
+func init() {
+	Register(WasmPluginsRerouteMatchRule)
+}
+
+// WasmPluginsRerouteMatchRule tests that wasm plugin matchRules work correctly
+// after a reroute triggered by a previous plugin (issue #3571).
+//
+// Scenario:
+//   - Ingress "reroute-match-default": host reroute-match.com, path /, no header constraint
+//   - Ingress "reroute-match-target": host reroute-match.com, path /, header x-user-id: 1
+//   - Plugin A (transformer, priority 400): matchRule for "reroute-match-default",
+//     maps query param "userId" to header "x-user-id", causing reroute
+//   - Plugin B (custom-response, priority 200): matchRule for "reroute-match-target",
+//     returns custom response {"hello":"world"}
+//
+// When sending GET /?userId=1, plugin A adds x-user-id:1 header and triggers reroute.
+// Plugin B should see the NEW route "reroute-match-target" and return the custom response.
+var WasmPluginsRerouteMatchRule = suite.ConformanceTest{
+	ShortName:   "WasmPluginsRerouteMatchRule",
+	Description: "Tests that wasm plugin matchRules work correctly after reroute triggered by a previous plugin (issue #3571).",
+	Manifests:   []string{"tests/go-wasm-reroute-match-rule.yaml"},
+	Features:    []suite.SupportedFeature{suite.WASMGoConformanceFeature},
+	Test: func(t *testing.T, suite *suite.ConformanceTestSuite) {
+		testcases := []http.Assertion{
+			{
+				Meta: http.AssertionMeta{
+					TestCaseName:  "case 1: matchRule should work after reroute - custom response expected",
+					CompareTarget: http.CompareTargetResponse,
+				},
+				Request: http.AssertionRequest{
+					ActualRequest: http.Request{
+						Host: "reroute-match.com",
+						Path: "/?userId=1",
+					},
+				},
+				Response: http.AssertionResponse{
+					ExpectedResponse: http.Response{
+						StatusCode: 200,
+						Headers: map[string]string{
+							"x-matched": "rerouted",
+						},
+						ContentType: http.ContentTypeApplicationJson,
+						Body:        []byte("{\"hello\":\"world\"}"),
+					},
+				},
+			},
+			{
+				Meta: http.AssertionMeta{
+					TestCaseName:    "case 2: no reroute without userId param - normal backend response",
+					TargetBackend:   "infra-backend-v1",
+					TargetNamespace: "higress-conformance-infra",
+				},
+				Request: http.AssertionRequest{
+					ActualRequest: http.Request{
+						Host: "reroute-match.com",
+						Path: "/get",
+					},
+					ExpectedRequest: &http.ExpectedRequest{
+						Request: http.Request{
+							Host: "reroute-match.com",
+							Path: "/get",
+						},
+					},
+				},
+				Response: http.AssertionResponse{
+					ExpectedResponse: http.Response{
+						StatusCode: 200,
+					},
+				},
+			},
+		}
+		t.Run("WasmPlugins reroute match rule", func(t *testing.T) {
+			for _, testcase := range testcases {
+				http.MakeRequestAndExpectEventuallyConsistentResponse(t, suite.RoundTripper, suite.TimeoutConfig, suite.GatewayAddress, testcase)
+			}
+		})
+	},
+}