snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

internal/xds/resolver/serviceconfig_test.go

@@ -0,0 +1,187 @@
+/*
+ *
+ * Copyright 2020 gRPC authors.
+ *
+ * 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 resolver
+
+import (
+	"context"
+	"regexp"
+	"testing"
+	"time"
+
+	xxhash "github.com/cespare/xxhash/v2"
+	"github.com/google/go-cmp/cmp"
+	"google.golang.org/grpc/internal/grpctest"
+	"google.golang.org/grpc/internal/grpcutil"
+	iresolver "google.golang.org/grpc/internal/resolver"
+	_ "google.golang.org/grpc/internal/xds/balancer/cdsbalancer" // To parse LB config
+	"google.golang.org/grpc/internal/xds/xdsclient/xdsresource"
+	"google.golang.org/grpc/metadata"
+)
+
+var defaultTestTimeout = 10 * time.Second
+
+type s struct {
+	grpctest.Tester
+}
+
+func Test(t *testing.T) {
+	grpctest.RunSubTests(t, s{})
+}
+
+func (s) TestPruneActiveClusters(t *testing.T) {
+	newClusterInfo := func(ref int32, unsubscribe func()) *clusterInfo {
+		ci := &clusterInfo{unsubscribe: unsubscribe}
+		ci.refCount.Store(ref)
+		return ci
+	}
+	r := &xdsResolver{
+		activeClusters: map[string]*clusterInfo{
+			"zero":        newClusterInfo(0, func() {}),
+			"one":         newClusterInfo(1, func() {}),
+			"two":         newClusterInfo(2, func() {}),
+			"anotherzero": newClusterInfo(0, func() {}),
+		},
+		activePlugins: map[string]*clusterInfo{
+			"zero":        newClusterInfo(0, nil),
+			"one":         newClusterInfo(1, nil),
+			"two":         newClusterInfo(2, nil),
+			"anotherzero": newClusterInfo(0, nil),
+		},
+	}
+	wantActiveClusters := map[string]int32{
+		"one": 1,
+		"two": 2,
+	}
+	wantActivePlugins := map[string]int32{
+		"one": 1,
+		"two": 2,
+	}
+	r.pruneActiveClustersAndPlugins()
+
+	getRefCounts := func(m map[string]*clusterInfo) map[string]int32 {
+		res := make(map[string]int32)
+		for k, v := range m {
+			res[k] = v.refCount.Load()
+		}
+		return res
+	}
+
+	if d := cmp.Diff(getRefCounts(r.activeClusters), wantActiveClusters); d != "" {
+		t.Fatalf("r.activeClusters refCounts mismatch (-got +want):\n%s", d)
+	}
+	if d := cmp.Diff(getRefCounts(r.activePlugins), wantActivePlugins); d != "" {
+		t.Fatalf("r.activePlugins refCounts mismatch (-got +want):\n%s", d)
+	}
+}
+
+func (s) TestGenerateRequestHash(t *testing.T) {
+	const channelID = 12378921
+	cs := &configSelector{channelID: channelID}
+
+	ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
+	defer cancel()
+	tests := []struct {
+		name            string
+		hashPolicies    []*xdsresource.HashPolicy
+		requestHashWant uint64
+		rpcInfo         iresolver.RPCInfo
+	}{
+		// TestGenerateRequestHashHeaders tests generating request hashes for
+		// hash policies that specify to hash headers.
+		{
+			name: "test-generate-request-hash-headers",
+			hashPolicies: []*xdsresource.HashPolicy{{
+				HashPolicyType:    xdsresource.HashPolicyTypeHeader,
+				HeaderName:        ":path",
+				Regex:             func() *regexp.Regexp { return regexp.MustCompile("/products") }(), // Will replace /products with /new-products, to test find and replace functionality.
+				RegexSubstitution: "/new-products",
+			}},
+			requestHashWant: xxhash.Sum64String("/new-products"),
+			rpcInfo: iresolver.RPCInfo{
+				Context: metadata.NewOutgoingContext(ctx, metadata.Pairs(":path", "/products")),
+				Method:  "/some-method",
+			},
+		},
+		// TestGenerateHashChannelID tests generating request hashes for hash
+		// policies that specify to hash something that uniquely identifies the
+		// ClientConn (the pointer).
+		{
+			name: "test-generate-request-hash-channel-id",
+			hashPolicies: []*xdsresource.HashPolicy{{
+				HashPolicyType: xdsresource.HashPolicyTypeChannelID,
+			}},
+			requestHashWant: channelID,
+			rpcInfo:         iresolver.RPCInfo{},
+		},
+		// TestGenerateRequestHashEmptyString tests generating request hashes
+		// for hash policies that specify to hash headers and replace empty
+		// strings in the headers.
+		{
+			name: "test-generate-request-hash-empty-string",
+			hashPolicies: []*xdsresource.HashPolicy{{
+				HashPolicyType:    xdsresource.HashPolicyTypeHeader,
+				HeaderName:        ":path",
+				Regex:             func() *regexp.Regexp { return regexp.MustCompile("") }(),
+				RegexSubstitution: "e",
+			}},
+			requestHashWant: xxhash.Sum64String("eaebece"),
+			rpcInfo: iresolver.RPCInfo{
+				Context: metadata.NewOutgoingContext(ctx, metadata.Pairs(":path", "abc")),
+				Method:  "/some-method",
+			},
+		},
+		// Tests that bin headers are skipped.
+		{
+			name: "skip-bin",
+			hashPolicies: []*xdsresource.HashPolicy{{
+				HashPolicyType: xdsresource.HashPolicyTypeHeader,
+				HeaderName:     "something-bin",
+			}, {
+				HashPolicyType: xdsresource.HashPolicyTypeChannelID,
+			}},
+			requestHashWant: channelID,
+			rpcInfo: iresolver.RPCInfo{
+				Context: metadata.NewOutgoingContext(ctx, metadata.Pairs("something-bin", "xyz")),
+			},
+		},
+		// Tests that extra metadata takes precedence over the user's metadata.
+		{
+			name: "extra-metadata",
+			hashPolicies: []*xdsresource.HashPolicy{{
+				HashPolicyType: xdsresource.HashPolicyTypeHeader,
+				HeaderName:     "content-type",
+			}},
+			requestHashWant: xxhash.Sum64String("grpc value"),
+			rpcInfo: iresolver.RPCInfo{
+				Context: grpcutil.WithExtraMetadata(
+					metadata.NewOutgoingContext(ctx, metadata.Pairs("content-type", "user value")),
+					metadata.Pairs("content-type", "grpc value"),
+				),
+			},
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			requestHashGot := cs.generateHash(test.rpcInfo, test.hashPolicies)
+			if requestHashGot != test.requestHashWant {
+				t.Fatalf("requestHashGot = %v, requestHashWant = %v", requestHashGot, test.requestHashWant)
+			}
+		})
+	}
+}