forked from grpc/grpc-go
/
balancer_test.go
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/
balancer_test.go
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/*
*
* Copyright 2019 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 lrs
import (
"fmt"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"google.golang.org/grpc/attributes"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/balancer/roundrobin"
"google.golang.org/grpc/connectivity"
internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
"google.golang.org/grpc/resolver"
xdsinternal "google.golang.org/grpc/xds/internal"
"google.golang.org/grpc/xds/internal/testutils"
)
var (
testBackendAddrs = []resolver.Address{
{Addr: "1.1.1.1:1"},
}
testLocality = &xdsinternal.LocalityID{
Region: "test-region",
Zone: "test-zone",
SubZone: "test-sub-zone",
}
)
// This is a subset of testutils.fakeclient. Cannot use testutils.fakeclient
// because testutils imports package lrs.
//
// TODO: after refactoring xdsclient to support load reporting, the testutils
// package won't need to depend on lrs package for the store. And we can use the
// testutils for this.
type fakeXDSClient struct {
loadReportCh chan *reportLoadArgs
}
func newFakeXDSClient() *fakeXDSClient {
return &fakeXDSClient{
loadReportCh: make(chan *reportLoadArgs, 10),
}
}
// reportLoadArgs wraps the arguments passed to ReportLoad.
type reportLoadArgs struct {
// server is the name of the server to which the load is reported.
server string
// cluster is the name of the cluster for which load is reported.
cluster string
// loadStore is the store where loads are stored.
loadStore interface{}
}
// ReportLoad starts reporting load about clusterName to server.
func (xdsC *fakeXDSClient) ReportLoad(server string, clusterName string, loadStore Store) (cancel func()) {
xdsC.loadReportCh <- &reportLoadArgs{server: server, cluster: clusterName, loadStore: loadStore}
return func() {}
}
// waitForReportLoad waits for ReportLoad to be invoked on this client within a
// reasonable timeout, and returns the arguments passed to it.
func (xdsC *fakeXDSClient) waitForReportLoad() (*reportLoadArgs, error) {
select {
case <-time.After(time.Second):
return nil, fmt.Errorf("timeout")
case a := <-xdsC.loadReportCh:
return a, nil
}
}
// Close closes the xds client.
func (xdsC *fakeXDSClient) Close() {
}
// TestLoadReporting verifies that the lrs balancer starts the loadReport
// stream when the lbConfig passed to it contains a valid value for the LRS
// server (empty string).
func TestLoadReporting(t *testing.T) {
builder := balancer.Get(lrsBalancerName)
cc := testutils.NewTestClientConn(t)
lrsB := builder.Build(cc, balancer.BuildOptions{})
defer lrsB.Close()
xdsC := newFakeXDSClient()
if err := lrsB.UpdateClientConnState(balancer.ClientConnState{
ResolverState: resolver.State{
Addresses: testBackendAddrs,
Attributes: attributes.New(xdsinternal.XDSClientID, xdsC),
},
BalancerConfig: &lbConfig{
EdsServiceName: testClusterName,
LrsLoadReportingServerName: testLRSServerName,
Locality: testLocality,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
got, err := xdsC.waitForReportLoad()
if err != nil {
t.Fatalf("xdsClient.ReportLoad failed with error: %v", err)
}
if got.server != testLRSServerName || got.cluster != testClusterName {
t.Fatalf("xdsClient.ReportLoad called with {%q, %q}: want {%q, %q}", got.server, got.cluster, testLRSServerName, testClusterName)
}
sc1 := <-cc.NewSubConnCh
lrsB.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
lrsB.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Ready})
// Test pick with one backend.
p1 := <-cc.NewPickerCh
const successCount = 5
for i := 0; i < successCount; i++ {
gotSCSt, _ := p1.Pick(balancer.PickInfo{})
if !cmp.Equal(gotSCSt.SubConn, sc1, cmp.AllowUnexported(testutils.TestSubConn{})) {
t.Fatalf("picker.Pick, got %v, want SubConn=%v", gotSCSt, sc1)
}
gotSCSt.Done(balancer.DoneInfo{})
}
const errorCount = 5
for i := 0; i < errorCount; i++ {
gotSCSt, _ := p1.Pick(balancer.PickInfo{})
if !cmp.Equal(gotSCSt.SubConn, sc1, cmp.AllowUnexported(testutils.TestSubConn{})) {
t.Fatalf("picker.Pick, got %v, want SubConn=%v", gotSCSt, sc1)
}
gotSCSt.Done(balancer.DoneInfo{Err: fmt.Errorf("error")})
}
loads := make(map[xdsinternal.LocalityID]*rpcCountData)
got.loadStore.(*lrsStore).localityRPCCount.Range(
func(key, value interface{}) bool {
loads[key.(xdsinternal.LocalityID)] = value.(*rpcCountData)
return true
},
)
countData, ok := loads[*testLocality]
if !ok {
t.Fatalf("loads for %v not found in store", testLocality)
}
if *countData.succeeded != successCount {
t.Errorf("got succeeded %v, want %v", *countData.succeeded, successCount)
}
if *countData.errored != errorCount {
t.Errorf("got errord %v, want %v", *countData.errored, errorCount)
}
if *countData.inProgress != 0 {
t.Errorf("got inProgress %v, want %v", *countData.inProgress, 0)
}
}