/
googlec2p_test.go
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/
googlec2p_test.go
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// +build go1.12
/*
*
* Copyright 2021 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 googledirectpath
import (
"strconv"
"testing"
"time"
v3corepb "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"google.golang.org/grpc"
"google.golang.org/grpc/internal/xds/env"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/xds/internal/version"
"google.golang.org/grpc/xds/internal/xdsclient/bootstrap"
"google.golang.org/protobuf/testing/protocmp"
"google.golang.org/protobuf/types/known/structpb"
)
type emptyResolver struct {
resolver.Resolver
scheme string
}
func (er *emptyResolver) Build(_ resolver.Target, _ resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
return er, nil
}
func (er *emptyResolver) Scheme() string {
return er.scheme
}
func (er *emptyResolver) Close() {}
var (
testDNSResolver = &emptyResolver{scheme: "dns"}
testXDSResolver = &emptyResolver{scheme: "xds"}
)
func replaceResolvers() func() {
var registerForTesting bool
if resolver.Get(c2pScheme) == nil {
// If env var to enable c2p is not set, the resolver isn't registered.
// Need to register and unregister in defer.
registerForTesting = true
resolver.Register(&c2pResolverBuilder{})
}
oldDNS := resolver.Get("dns")
resolver.Register(testDNSResolver)
oldXDS := resolver.Get("xds")
resolver.Register(testXDSResolver)
return func() {
if oldDNS != nil {
resolver.Register(oldDNS)
} else {
resolver.UnregisterForTesting("dns")
}
if oldXDS != nil {
resolver.Register(oldXDS)
} else {
resolver.UnregisterForTesting("xds")
}
if registerForTesting {
resolver.UnregisterForTesting(c2pScheme)
}
}
}
// Test that when bootstrap env is set, fallback to DNS.
func TestBuildWithBootstrapEnvSet(t *testing.T) {
defer replaceResolvers()()
builder := resolver.Get(c2pScheme)
for i, envP := range []*string{&env.BootstrapFileName, &env.BootstrapFileContent} {
t.Run(strconv.Itoa(i), func(t *testing.T) {
// Set bootstrap config env var.
oldEnv := *envP
*envP = "does not matter"
defer func() { *envP = oldEnv }()
// Build should return DNS, not xDS.
r, err := builder.Build(resolver.Target{}, nil, resolver.BuildOptions{})
if err != nil {
t.Fatalf("failed to build resolver: %v", err)
}
if r != testDNSResolver {
t.Fatalf("want dns resolver, got %#v", r)
}
})
}
}
// Test that when not on GCE, fallback to DNS.
func TestBuildNotOnGCE(t *testing.T) {
defer replaceResolvers()()
builder := resolver.Get(c2pScheme)
oldOnGCE := onGCE
onGCE = func() bool { return false }
defer func() { onGCE = oldOnGCE }()
// Build should return DNS, not xDS.
r, err := builder.Build(resolver.Target{}, nil, resolver.BuildOptions{})
if err != nil {
t.Fatalf("failed to build resolver: %v", err)
}
if r != testDNSResolver {
t.Fatalf("want dns resolver, got %#v", r)
}
}
type testXDSClient struct {
closed chan struct{}
}
func (c *testXDSClient) Close() {
c.closed <- struct{}{}
}
// Test that when xDS is built, the client is built with the correct config.
func TestBuildXDS(t *testing.T) {
defer replaceResolvers()()
builder := resolver.Get(c2pScheme)
oldOnGCE := onGCE
onGCE = func() bool { return true }
defer func() { onGCE = oldOnGCE }()
const testZone = "test-zone"
oldGetZone := getZone
getZone = func(time.Duration) string { return testZone }
defer func() { getZone = oldGetZone }()
for _, tt := range []struct {
name string
ipv6 bool
tdURI string // traffic director URI will be overridden if this is set.
}{
{name: "ipv6 true", ipv6: true},
{name: "ipv6 false", ipv6: false},
{name: "override TD URI", ipv6: true, tdURI: "test-uri"},
} {
t.Run(tt.name, func(t *testing.T) {
oldGetIPv6Capability := getIPv6Capable
getIPv6Capable = func(time.Duration) bool { return tt.ipv6 }
defer func() { getIPv6Capable = oldGetIPv6Capability }()
if tt.tdURI != "" {
oldURI := env.C2PResolverTestOnlyTrafficDirectorURI
env.C2PResolverTestOnlyTrafficDirectorURI = tt.tdURI
defer func() {
env.C2PResolverTestOnlyTrafficDirectorURI = oldURI
}()
}
tXDSClient := &testXDSClient{closed: make(chan struct{}, 1)}
configCh := make(chan *bootstrap.Config, 1)
oldNewClient := newClientWithConfig
newClientWithConfig = func(config *bootstrap.Config) (xdsClient, error) {
configCh <- config
return tXDSClient, nil
}
defer func() { newClientWithConfig = oldNewClient }()
// Build should return DNS, not xDS.
r, err := builder.Build(resolver.Target{}, nil, resolver.BuildOptions{})
if err != nil {
t.Fatalf("failed to build resolver: %v", err)
}
rr := r.(*c2pResolver)
if rrr := rr.Resolver; rrr != testXDSResolver {
t.Fatalf("want xds resolver, got %#v, ", rrr)
}
wantNode := &v3corepb.Node{
Id: id,
Metadata: nil,
Locality: &v3corepb.Locality{Zone: testZone},
UserAgentName: gRPCUserAgentName,
UserAgentVersionType: &v3corepb.Node_UserAgentVersion{UserAgentVersion: grpc.Version},
ClientFeatures: []string{clientFeatureNoOverprovisioning},
}
if tt.ipv6 {
wantNode.Metadata = &structpb.Struct{
Fields: map[string]*structpb.Value{
ipv6CapableMetadataName: {
Kind: &structpb.Value_BoolValue{BoolValue: true},
},
},
}
}
wantConfig := &bootstrap.Config{
BalancerName: tdURL,
TransportAPI: version.TransportV3,
NodeProto: wantNode,
}
if tt.tdURI != "" {
wantConfig.BalancerName = tt.tdURI
}
cmpOpts := cmp.Options{
cmpopts.IgnoreFields(bootstrap.Config{}, "Creds"),
protocmp.Transform(),
}
select {
case c := <-configCh:
if diff := cmp.Diff(c, wantConfig, cmpOpts); diff != "" {
t.Fatalf("%v", diff)
}
case <-time.After(time.Second):
t.Fatalf("timeout waiting for client config")
}
r.Close()
select {
case <-tXDSClient.closed:
case <-time.After(time.Second):
t.Fatalf("timeout waiting for client close")
}
})
}
}