mirror of https://github.com/grpc/grpc-go.git
test: cleanup roundrobin tests to use stubserver (#5236)
This commit is contained in:
Easwar Swaminathan
GitHub
parent
23cc28fd63
commit
94ee3865e1
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@ -1,591 +0,0 @@
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/*
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*
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* Copyright 2017 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package roundrobin_test
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"sync"
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"testing"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/balancer/roundrobin"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/internal/grpctest"
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imetadata "google.golang.org/grpc/internal/metadata"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/peer"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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"google.golang.org/grpc/status"
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testpb "google.golang.org/grpc/test/grpc_testing"
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)
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const (
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testMDKey = "test-md"
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)
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type s struct {
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grpctest.Tester
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}
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func Test(t *testing.T) {
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grpctest.RunSubTests(t, s{})
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}
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type testServer struct {
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testpb.UnimplementedTestServiceServer
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testMDChan chan []string
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}
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func newTestServer(mdchan bool) *testServer {
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t := &testServer{}
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if mdchan {
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t.testMDChan = make(chan []string, 1)
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}
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return t
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}
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func (s *testServer) EmptyCall(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
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if s.testMDChan == nil {
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return &testpb.Empty{}, nil
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}
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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return nil, status.Errorf(codes.Internal, "no metadata in context")
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}
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select {
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case s.testMDChan <- md[testMDKey]:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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return &testpb.Empty{}, nil
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}
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func (s *testServer) FullDuplexCall(stream testpb.TestService_FullDuplexCallServer) error {
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return nil
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}
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type test struct {
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servers []*grpc.Server
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serverImpls []*testServer
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addresses []string
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}
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func (t *test) cleanup() {
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for _, s := range t.servers {
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s.Stop()
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}
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}
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func startTestServers(count int, mdchan bool) (_ *test, err error) {
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t := &test{}
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defer func() {
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if err != nil {
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t.cleanup()
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}
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}()
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for i := 0; i < count; i++ {
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lis, err := net.Listen("tcp", "localhost:0")
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if err != nil {
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return nil, fmt.Errorf("failed to listen %v", err)
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}
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s := grpc.NewServer()
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sImpl := newTestServer(mdchan)
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testpb.RegisterTestServiceServer(s, sImpl)
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t.servers = append(t.servers, s)
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t.serverImpls = append(t.serverImpls, sImpl)
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t.addresses = append(t.addresses, lis.Addr().String())
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go func(s *grpc.Server, l net.Listener) {
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s.Serve(l)
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}(s, lis)
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}
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return t, nil
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}
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func (s) TestOneBackend(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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test, err := startTestServers(1, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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defer cc.Close()
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testc := testpb.NewTestServiceClient(cc)
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// The first RPC should fail because there's no address.
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
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t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
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}
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: test.addresses[0]}}})
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// The second RPC should succeed.
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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}
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func (s) TestBackendsRoundRobin(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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backendCount := 5
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test, err := startTestServers(backendCount, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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defer cc.Close()
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testc := testpb.NewTestServiceClient(cc)
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// The first RPC should fail because there's no address.
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
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t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
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}
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var resolvedAddrs []resolver.Address
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for i := 0; i < backendCount; i++ {
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resolvedAddrs = append(resolvedAddrs, resolver.Address{Addr: test.addresses[i]})
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}
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r.UpdateState(resolver.State{Addresses: resolvedAddrs})
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var p peer.Peer
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// Make sure connections to all servers are up.
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for si := 0; si < backendCount; si++ {
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var connected bool
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for i := 0; i < 1000; i++ {
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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if p.Addr.String() == test.addresses[si] {
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connected = true
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break
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}
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time.Sleep(time.Millisecond)
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}
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if !connected {
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t.Fatalf("Connection to %v was not up after more than 1 second", test.addresses[si])
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}
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}
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for i := 0; i < 3*backendCount; i++ {
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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if p.Addr.String() != test.addresses[i%backendCount] {
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t.Fatalf("Index %d: want peer %v, got peer %v", i, test.addresses[i%backendCount], p.Addr.String())
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}
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}
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}
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func (s) TestAddressesRemoved(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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test, err := startTestServers(1, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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defer cc.Close()
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testc := testpb.NewTestServiceClient(cc)
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// The first RPC should fail because there's no address.
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
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t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
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}
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: test.addresses[0]}}})
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// The second RPC should succeed.
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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r.UpdateState(resolver.State{Addresses: []resolver.Address{}})
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ctx2, cancel2 := context.WithTimeout(context.Background(), 500*time.Millisecond)
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defer cancel2()
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// Wait for state to change to transient failure.
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for src := cc.GetState(); src != connectivity.TransientFailure; src = cc.GetState() {
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if !cc.WaitForStateChange(ctx2, src) {
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t.Fatalf("timed out waiting for state change. got %v; want %v", src, connectivity.TransientFailure)
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}
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}
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const msgWant = "produced zero addresses"
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if _, err := testc.EmptyCall(ctx2, &testpb.Empty{}); !strings.Contains(status.Convert(err).Message(), msgWant) {
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t.Fatalf("EmptyCall() = _, %v, want _, Contains(Message(), %q)", err, msgWant)
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}
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}
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func (s) TestCloseWithPendingRPC(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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test, err := startTestServers(1, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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testc := testpb.NewTestServiceClient(cc)
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var wg sync.WaitGroup
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for i := 0; i < 3; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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// This RPC blocks until cc is closed.
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) == codes.DeadlineExceeded {
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t.Errorf("RPC failed because of deadline after cc is closed; want error the client connection is closing")
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}
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cancel()
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}()
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}
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cc.Close()
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wg.Wait()
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}
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func (s) TestNewAddressWhileBlocking(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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test, err := startTestServers(1, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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defer cc.Close()
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testc := testpb.NewTestServiceClient(cc)
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// The first RPC should fail because there's no address.
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
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t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
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}
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: test.addresses[0]}}})
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// The second RPC should succeed.
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ctx, cancel = context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, nil", err)
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}
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r.UpdateState(resolver.State{Addresses: []resolver.Address{}})
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var wg sync.WaitGroup
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for i := 0; i < 3; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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// This RPC blocks until NewAddress is called.
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testc.EmptyCall(context.Background(), &testpb.Empty{})
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}()
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}
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time.Sleep(50 * time.Millisecond)
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: test.addresses[0]}}})
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wg.Wait()
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}
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func (s) TestOneServerDown(t *testing.T) {
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r := manual.NewBuilderWithScheme("whatever")
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backendCount := 3
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test, err := startTestServers(backendCount, false)
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if err != nil {
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t.Fatalf("failed to start servers: %v", err)
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}
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defer test.cleanup()
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cc, err := grpc.Dial(r.Scheme()+":///test.server",
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
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if err != nil {
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t.Fatalf("failed to dial: %v", err)
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}
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defer cc.Close()
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testc := testpb.NewTestServiceClient(cc)
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// The first RPC should fail because there's no address.
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
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defer cancel()
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if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
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t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
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}
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var resolvedAddrs []resolver.Address
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for i := 0; i < backendCount; i++ {
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resolvedAddrs = append(resolvedAddrs, resolver.Address{Addr: test.addresses[i]})
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}
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r.UpdateState(resolver.State{Addresses: resolvedAddrs})
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var p peer.Peer
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// Make sure connections to all servers are up.
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for si := 0; si < backendCount; si++ {
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var connected bool
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for i := 0; i < 1000; i++ {
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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if p.Addr.String() == test.addresses[si] {
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connected = true
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break
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}
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time.Sleep(time.Millisecond)
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}
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if !connected {
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t.Fatalf("Connection to %v was not up after more than 1 second", test.addresses[si])
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}
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}
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for i := 0; i < 3*backendCount; i++ {
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
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t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
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}
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if p.Addr.String() != test.addresses[i%backendCount] {
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t.Fatalf("Index %d: want peer %v, got peer %v", i, test.addresses[i%backendCount], p.Addr.String())
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}
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}
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// Stop one server, RPCs should roundrobin among the remaining servers.
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backendCount--
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test.servers[backendCount].Stop()
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// Loop until see server[backendCount-1] twice without seeing server[backendCount].
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var targetSeen int
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for i := 0; i < 1000; i++ {
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
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targetSeen = 0
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t.Logf("EmptyCall() = _, %v, want _, <nil>", err)
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// Due to a race, this RPC could possibly get the connection that
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// was closing, and this RPC may fail. Keep trying when this
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// happens.
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continue
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}
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switch p.Addr.String() {
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case test.addresses[backendCount-1]:
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targetSeen++
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case test.addresses[backendCount]:
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// Reset targetSeen if peer is server[backendCount].
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targetSeen = 0
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}
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// Break to make sure the last picked address is server[-1], so the following for loop won't be flaky.
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if targetSeen >= 2 {
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break
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}
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}
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if targetSeen != 2 {
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t.Fatal("Failed to see server[backendCount-1] twice without seeing server[backendCount]")
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}
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for i := 0; i < 3*backendCount; i++ {
|
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if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
|
||||
}
|
||||
if p.Addr.String() != test.addresses[i%backendCount] {
|
||||
t.Errorf("Index %d: want peer %v, got peer %v", i, test.addresses[i%backendCount], p.Addr.String())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (s) TestAllServersDown(t *testing.T) {
|
||||
r := manual.NewBuilderWithScheme("whatever")
|
||||
|
||||
backendCount := 3
|
||||
test, err := startTestServers(backendCount, false)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to start servers: %v", err)
|
||||
}
|
||||
defer test.cleanup()
|
||||
|
||||
cc, err := grpc.Dial(r.Scheme()+":///test.server",
|
||||
grpc.WithTransportCredentials(insecure.NewCredentials()),
|
||||
grpc.WithResolvers(r),
|
||||
grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
|
||||
if err != nil {
|
||||
t.Fatalf("failed to dial: %v", err)
|
||||
}
|
||||
defer cc.Close()
|
||||
testc := testpb.NewTestServiceClient(cc)
|
||||
// The first RPC should fail because there's no address.
|
||||
ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
|
||||
defer cancel()
|
||||
if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
|
||||
}
|
||||
|
||||
var resolvedAddrs []resolver.Address
|
||||
for i := 0; i < backendCount; i++ {
|
||||
resolvedAddrs = append(resolvedAddrs, resolver.Address{Addr: test.addresses[i]})
|
||||
}
|
||||
|
||||
r.UpdateState(resolver.State{Addresses: resolvedAddrs})
|
||||
var p peer.Peer
|
||||
// Make sure connections to all servers are up.
|
||||
for si := 0; si < backendCount; si++ {
|
||||
var connected bool
|
||||
for i := 0; i < 1000; i++ {
|
||||
if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
|
||||
}
|
||||
if p.Addr.String() == test.addresses[si] {
|
||||
connected = true
|
||||
break
|
||||
}
|
||||
time.Sleep(time.Millisecond)
|
||||
}
|
||||
if !connected {
|
||||
t.Fatalf("Connection to %v was not up after more than 1 second", test.addresses[si])
|
||||
}
|
||||
}
|
||||
|
||||
for i := 0; i < 3*backendCount; i++ {
|
||||
if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Peer(&p)); err != nil {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
|
||||
}
|
||||
if p.Addr.String() != test.addresses[i%backendCount] {
|
||||
t.Fatalf("Index %d: want peer %v, got peer %v", i, test.addresses[i%backendCount], p.Addr.String())
|
||||
}
|
||||
}
|
||||
|
||||
// All servers are stopped, failfast RPC should fail with unavailable.
|
||||
for i := 0; i < backendCount; i++ {
|
||||
test.servers[i].Stop()
|
||||
}
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
for i := 0; i < 1000; i++ {
|
||||
if _, err := testc.EmptyCall(context.Background(), &testpb.Empty{}); status.Code(err) == codes.Unavailable {
|
||||
return
|
||||
}
|
||||
time.Sleep(time.Millisecond)
|
||||
}
|
||||
t.Fatalf("Failfast RPCs didn't fail with Unavailable after all servers are stopped")
|
||||
}
|
||||
|
||||
func (s) TestUpdateAddressAttributes(t *testing.T) {
|
||||
r := manual.NewBuilderWithScheme("whatever")
|
||||
|
||||
test, err := startTestServers(1, true)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to start servers: %v", err)
|
||||
}
|
||||
defer test.cleanup()
|
||||
|
||||
cc, err := grpc.Dial(r.Scheme()+":///test.server",
|
||||
grpc.WithTransportCredentials(insecure.NewCredentials()),
|
||||
grpc.WithResolvers(r),
|
||||
grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingConfig": [{"%s":{}}]}`, roundrobin.Name)))
|
||||
if err != nil {
|
||||
t.Fatalf("failed to dial: %v", err)
|
||||
}
|
||||
defer cc.Close()
|
||||
testc := testpb.NewTestServiceClient(cc)
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||||
defer cancel()
|
||||
|
||||
// The first RPC should fail because there's no address.
|
||||
ctxShort, cancel2 := context.WithTimeout(ctx, time.Millisecond)
|
||||
defer cancel2()
|
||||
if _, err := testc.EmptyCall(ctxShort, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, DeadlineExceeded", err)
|
||||
}
|
||||
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: test.addresses[0]}}})
|
||||
// The second RPC should succeed.
|
||||
if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); err != nil {
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
|
||||
}
|
||||
// The second RPC should not set metadata, so there's no md in the channel.
|
||||
md1 := <-test.serverImpls[0].testMDChan
|
||||
if md1 != nil {
|
||||
t.Fatalf("got md: %v, want empty metadata", md1)
|
||||
}
|
||||
|
||||
const testMDValue = "test-md-value"
|
||||
// Update metadata in address.
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{
|
||||
imetadata.Set(resolver.Address{Addr: test.addresses[0]}, metadata.Pairs(testMDKey, testMDValue)),
|
||||
}})
|
||||
|
||||
// A future RPC should send metadata with it. The update doesn't
|
||||
// necessarily happen synchronously, so we wait some time before failing if
|
||||
// some RPCs do not contain it.
|
||||
for {
|
||||
if _, err := testc.EmptyCall(ctx, &testpb.Empty{}); err != nil {
|
||||
if status.Code(err) == codes.DeadlineExceeded {
|
||||
t.Fatalf("timed out waiting for metadata in response")
|
||||
}
|
||||
t.Fatalf("EmptyCall() = _, %v, want _, <nil>", err)
|
||||
}
|
||||
md2 := <-test.serverImpls[0].testMDChan
|
||||
if len(md2) == 1 && md2[0] == testMDValue {
|
||||
return
|
||||
}
|
||||
time.Sleep(10 * time.Millisecond)
|
||||
}
|
||||
}
|
||||
|
|
@ -23,7 +23,6 @@ import (
|
|||
"net"
|
||||
"strings"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"google.golang.org/grpc"
|
||||
"google.golang.org/grpc/codes"
|
||||
|
|
@ -36,8 +35,6 @@ import (
|
|||
testpb "google.golang.org/grpc/test/grpc_testing"
|
||||
)
|
||||
|
||||
const defaultTestTimeout = 5 * time.Second
|
||||
|
||||
// testLegacyPerRPCCredentials is a PerRPCCredentials that has yet incorporated security level.
|
||||
type testLegacyPerRPCCredentials struct{}
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,411 @@
|
|||
/*
|
||||
*
|
||||
* Copyright 2022 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 test
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"strings"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"google.golang.org/grpc"
|
||||
"google.golang.org/grpc/codes"
|
||||
"google.golang.org/grpc/connectivity"
|
||||
"google.golang.org/grpc/credentials/insecure"
|
||||
"google.golang.org/grpc/internal/grpcsync"
|
||||
imetadata "google.golang.org/grpc/internal/metadata"
|
||||
"google.golang.org/grpc/internal/stubserver"
|
||||
"google.golang.org/grpc/metadata"
|
||||
"google.golang.org/grpc/peer"
|
||||
"google.golang.org/grpc/resolver"
|
||||
"google.golang.org/grpc/resolver/manual"
|
||||
"google.golang.org/grpc/stats"
|
||||
"google.golang.org/grpc/status"
|
||||
testgrpc "google.golang.org/grpc/test/grpc_testing"
|
||||
testpb "google.golang.org/grpc/test/grpc_testing"
|
||||
)
|
||||
|
||||
const rrServiceConfig = `{"loadBalancingConfig": [{"round_robin":{}}]}`
|
||||
|
||||
func statsHandlerDialOption(funcs statsHandlerFuncs) grpc.DialOption {
|
||||
return grpc.WithStatsHandler(&statsHandler{funcs: funcs})
|
||||
}
|
||||
|
||||
type statsHandlerFuncs struct {
|
||||
TagRPC func(context.Context, *stats.RPCTagInfo) context.Context
|
||||
HandleRPC func(context.Context, stats.RPCStats)
|
||||
TagConn func(context.Context, *stats.ConnTagInfo) context.Context
|
||||
HandleConn func(context.Context, stats.ConnStats)
|
||||
}
|
||||
|
||||
type statsHandler struct {
|
||||
funcs statsHandlerFuncs
|
||||
}
|
||||
|
||||
func (s *statsHandler) TagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
|
||||
if s.funcs.TagRPC != nil {
|
||||
return s.funcs.TagRPC(ctx, info)
|
||||
}
|
||||
return ctx
|
||||
}
|
||||
|
||||
func (s *statsHandler) HandleRPC(ctx context.Context, stats stats.RPCStats) {
|
||||
if s.funcs.HandleRPC != nil {
|
||||
s.funcs.HandleRPC(ctx, stats)
|
||||
}
|
||||
}
|
||||
|
||||
func (s *statsHandler) TagConn(ctx context.Context, info *stats.ConnTagInfo) context.Context {
|
||||
if s.funcs.TagConn != nil {
|
||||
return s.funcs.TagConn(ctx, info)
|
||||
}
|
||||
return ctx
|
||||
}
|
||||
|
||||
func (s *statsHandler) HandleConn(ctx context.Context, stats stats.ConnStats) {
|
||||
if s.funcs.HandleConn != nil {
|
||||
s.funcs.HandleConn(ctx, stats)
|
||||
}
|
||||
}
|
||||
|
||||
func checkRoundRobin(ctx context.Context, client testgrpc.TestServiceClient, addrs []resolver.Address) error {
|
||||
var peer peer.Peer
|
||||
// Make sure connections to all backends are up.
|
||||
backendCount := len(addrs)
|
||||
for i := 0; i < backendCount; i++ {
|
||||
for {
|
||||
time.Sleep(time.Millisecond)
|
||||
if ctx.Err() != nil {
|
||||
return fmt.Errorf("timeout waiting for connection to %q to be up", addrs[i].Addr)
|
||||
}
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}, grpc.Peer(&peer)); err != nil {
|
||||
// Some tests remove backends and check if round robin is happening
|
||||
// across the remaining backends. In such cases, RPCs can initially fail
|
||||
// on the connection using the removed backend. Just keep retrying and
|
||||
// eventually the connection using the removed backend will shutdown and
|
||||
// will be removed.
|
||||
continue
|
||||
}
|
||||
if peer.Addr.String() == addrs[i].Addr {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
// Make sure RPCs are sent to all backends.
|
||||
for i := 0; i < 3*backendCount; i++ {
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}, grpc.Peer(&peer)); err != nil {
|
||||
return fmt.Errorf("EmptyCall() = %v, want <nil>", err)
|
||||
}
|
||||
if gotPeer, wantPeer := addrs[i%backendCount].Addr, peer.Addr.String(); gotPeer != wantPeer {
|
||||
return fmt.Errorf("rpc sent to peer %q, want peer %q", gotPeer, wantPeer)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func testRoundRobinBasic(ctx context.Context, t *testing.T, opts ...grpc.DialOption) (*grpc.ClientConn, *manual.Resolver, []*stubserver.StubServer) {
|
||||
t.Helper()
|
||||
r := manual.NewBuilderWithScheme("whatever")
|
||||
|
||||
const backendCount = 5
|
||||
backends := make([]*stubserver.StubServer, backendCount)
|
||||
addrs := make([]resolver.Address, backendCount)
|
||||
for i := 0; i < backendCount; i++ {
|
||||
backend := &stubserver.StubServer{
|
||||
EmptyCallF: func(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) { return &testpb.Empty{}, nil },
|
||||
}
|
||||
if err := backend.StartServer(); err != nil {
|
||||
t.Fatalf("Failed to start backend: %v", err)
|
||||
}
|
||||
t.Logf("Started TestService backend at: %q", backend.Address)
|
||||
t.Cleanup(func() { backend.Stop() })
|
||||
|
||||
backends[i] = backend
|
||||
addrs[i] = resolver.Address{Addr: backend.Address}
|
||||
}
|
||||
|
||||
dopts := []grpc.DialOption{
|
||||
grpc.WithTransportCredentials(insecure.NewCredentials()),
|
||||
grpc.WithResolvers(r),
|
||||
grpc.WithDefaultServiceConfig(rrServiceConfig),
|
||||
}
|
||||
dopts = append(dopts, opts...)
|
||||
cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
|
||||
if err != nil {
|
||||
t.Fatalf("grpc.Dial() failed: %v", err)
|
||||
}
|
||||
t.Cleanup(func() { cc.Close() })
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
|
||||
// At this point, the resolver has not returned any addresses to the channel.
|
||||
// This RPC must block until the context expires.
|
||||
sCtx, sCancel := context.WithTimeout(context.Background(), defaultTestShortTimeout)
|
||||
defer sCancel()
|
||||
if _, err := client.EmptyCall(sCtx, &testpb.Empty{}); status.Code(err) != codes.DeadlineExceeded {
|
||||
t.Fatalf("EmptyCall() = %s, want %s", status.Code(err), codes.DeadlineExceeded)
|
||||
}
|
||||
|
||||
r.UpdateState(resolver.State{Addresses: addrs})
|
||||
if err := checkRoundRobin(ctx, client, addrs); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
return cc, r, backends
|
||||
}
|
||||
|
||||
// TestRoundRobin_Basic tests the most basic scenario for round_robin. It brings
|
||||
// up a bunch of backends and verifies that RPCs are getting round robin-ed
|
||||
// across these backends.
|
||||
func (s) TestRoundRobin_Basic(t *testing.T) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
testRoundRobinBasic(ctx, t)
|
||||
}
|
||||
|
||||
// TestRoundRobin_AddressesRemoved tests the scenario where a bunch of backends
|
||||
// are brought up, and round_robin is configured as the LB policy and RPCs are
|
||||
// being correctly round robin-ed across these backends. We then send a resolver
|
||||
// update with no addresses and verify that the channel enters TransientFailure
|
||||
// and RPCs fail with an expected error message.
|
||||
func (s) TestRoundRobin_AddressesRemoved(t *testing.T) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
cc, r, _ := testRoundRobinBasic(ctx, t)
|
||||
|
||||
// Send a resolver update with no addresses. This should push the channel into
|
||||
// TransientFailure.
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{}})
|
||||
for state := cc.GetState(); state != connectivity.TransientFailure; state = cc.GetState() {
|
||||
if !cc.WaitForStateChange(ctx, state) {
|
||||
t.Fatalf("timeout waiting for state change. got %v; want %v", state, connectivity.TransientFailure)
|
||||
}
|
||||
}
|
||||
|
||||
const msgWant = "produced zero addresses"
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); !strings.Contains(status.Convert(err).Message(), msgWant) {
|
||||
t.Fatalf("EmptyCall() = %v, want Contains(Message(), %q)", err, msgWant)
|
||||
}
|
||||
}
|
||||
|
||||
// TestRoundRobin_NewAddressWhileBlocking tests the case where round_robin is
|
||||
// configured on a channel, things are working as expected and then a resolver
|
||||
// updates removes all addresses. An RPC attempted at this point in time will be
|
||||
// blocked because there are no valid backends. This test verifies that when new
|
||||
// backends are added, the RPC is able to complete.
|
||||
func (s) TestRoundRobin_NewAddressWhileBlocking(t *testing.T) {
|
||||
// Register a stats handler which writes to `rpcCh` when an RPC is started.
|
||||
// The stats handler starts writing to `rpcCh` only after `begin` has fired.
|
||||
// We are not interested in being notified about initial RPCs which ensure
|
||||
// that round_robin is working as expected. We are only interested in being
|
||||
// notified when we have an RPC which is blocked because there are no
|
||||
// backends, and will become unblocked when the resolver reports new backends.
|
||||
begin := grpcsync.NewEvent()
|
||||
rpcCh := make(chan struct{}, 1)
|
||||
shOption := statsHandlerDialOption(statsHandlerFuncs{
|
||||
HandleRPC: func(ctx context.Context, rpcStats stats.RPCStats) {
|
||||
if !begin.HasFired() {
|
||||
return
|
||||
}
|
||||
select {
|
||||
case rpcCh <- struct{}{}:
|
||||
default:
|
||||
}
|
||||
},
|
||||
})
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
cc, r, backends := testRoundRobinBasic(ctx, t, shOption)
|
||||
|
||||
// Send a resolver update with no addresses. This should push the channel into
|
||||
// TransientFailure.
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{}})
|
||||
for state := cc.GetState(); state != connectivity.TransientFailure; state = cc.GetState() {
|
||||
if !cc.WaitForStateChange(ctx, state) {
|
||||
t.Fatalf("timeout waiting for state change. got %v; want %v", state, connectivity.TransientFailure)
|
||||
}
|
||||
}
|
||||
|
||||
begin.Fire()
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
doneCh := make(chan struct{})
|
||||
go func() {
|
||||
// The channel is currently in TransientFailure and this RPC will block
|
||||
// until the channel becomes Ready, which will only happen when we push a
|
||||
// resolver update with a valid backend address.
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}, grpc.WaitForReady(true)); err != nil {
|
||||
t.Errorf("EmptyCall() = %v, want <nil>", err)
|
||||
}
|
||||
close(doneCh)
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
t.Fatal("Timeout when waiting for RPC to start and block")
|
||||
case <-rpcCh:
|
||||
}
|
||||
// Send a resolver update with a valid backend to push the channel to Ready
|
||||
// and unblock the above RPC.
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backends[0].Address}}})
|
||||
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
t.Fatal("Timeout when waiting for blocked RPC to complete")
|
||||
case <-doneCh:
|
||||
}
|
||||
}
|
||||
|
||||
// TestRoundRobin_OneServerDown tests the scenario where a channel is configured
|
||||
// to round robin across a set of backends, and things are working correctly.
|
||||
// One backend goes down. The test verifies that going forward, RPCs are round
|
||||
// robin-ed across the remaining set of backends.
|
||||
func (s) TestRoundRobin_OneServerDown(t *testing.T) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
cc, _, backends := testRoundRobinBasic(ctx, t)
|
||||
|
||||
// Stop one backend. RPCs should round robin across the remaining backends.
|
||||
backends[len(backends)-1].Stop()
|
||||
|
||||
addrs := make([]resolver.Address, len(backends)-1)
|
||||
for i := 0; i < len(backends)-1; i++ {
|
||||
addrs[i] = resolver.Address{Addr: backends[i].Address}
|
||||
}
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
if err := checkRoundRobin(ctx, client, addrs); err != nil {
|
||||
t.Fatalf("RPCs are not being round robined across remaining servers: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestRoundRobin_AllServersDown tests the scenario where a channel is
|
||||
// configured to round robin across a set of backends, and things are working
|
||||
// correctly. Then, all backends go down. The test verifies that the channel
|
||||
// moves to TransientFailure and failfast RPCs fail with Unavailable.
|
||||
func (s) TestRoundRobin_AllServersDown(t *testing.T) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
cc, _, backends := testRoundRobinBasic(ctx, t)
|
||||
|
||||
// Stop all backends.
|
||||
for _, b := range backends {
|
||||
b.Stop()
|
||||
}
|
||||
|
||||
// Wait for TransientFailure.
|
||||
for state := cc.GetState(); state != connectivity.TransientFailure; state = cc.GetState() {
|
||||
if !cc.WaitForStateChange(ctx, state) {
|
||||
t.Fatalf("timeout waiting for state change. got %v; want %v", state, connectivity.TransientFailure)
|
||||
}
|
||||
}
|
||||
|
||||
// Failfast RPCs should fail with Unavailable.
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
if _, err := client.EmptyCall(context.Background(), &testpb.Empty{}); status.Code(err) == codes.Unavailable {
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// TestRoundRobin_UpdateAddressAttributes tests the scenario where the addresses
|
||||
// returned by the resolver contain attributes. The test verifies that the
|
||||
// attributes contained in the addresses show up as RPC metadata in the backend.
|
||||
func (s) TestRoundRobin_UpdateAddressAttributes(t *testing.T) {
|
||||
const (
|
||||
testMDKey = "test-md"
|
||||
testMDValue = "test-md-value"
|
||||
)
|
||||
r := manual.NewBuilderWithScheme("whatever")
|
||||
|
||||
// Spin up a StubServer to serve as a backend. The implementation verifies
|
||||
// that the expected metadata is received.
|
||||
testMDChan := make(chan []string, 1)
|
||||
backend := &stubserver.StubServer{
|
||||
EmptyCallF: func(ctx context.Context, _ *testpb.Empty) (*testpb.Empty, error) {
|
||||
md, ok := metadata.FromIncomingContext(ctx)
|
||||
if ok {
|
||||
select {
|
||||
case testMDChan <- md[testMDKey]:
|
||||
case <-ctx.Done():
|
||||
return nil, ctx.Err()
|
||||
}
|
||||
}
|
||||
return &testpb.Empty{}, nil
|
||||
},
|
||||
}
|
||||
if err := backend.StartServer(); err != nil {
|
||||
t.Fatalf("Failed to start backend: %v", err)
|
||||
}
|
||||
t.Logf("Started TestService backend at: %q", backend.Address)
|
||||
t.Cleanup(func() { backend.Stop() })
|
||||
|
||||
// Dial the backend with round_robin as the LB policy.
|
||||
dopts := []grpc.DialOption{
|
||||
grpc.WithTransportCredentials(insecure.NewCredentials()),
|
||||
grpc.WithResolvers(r),
|
||||
grpc.WithDefaultServiceConfig(rrServiceConfig),
|
||||
}
|
||||
cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
|
||||
if err != nil {
|
||||
t.Fatalf("grpc.Dial() failed: %v", err)
|
||||
}
|
||||
t.Cleanup(func() { cc.Close() })
|
||||
|
||||
// Send a resolver update with no address attributes.
|
||||
addr := resolver.Address{Addr: backend.Address}
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{addr}})
|
||||
|
||||
// Make an RPC and ensure it does not contain the metadata we are looking for.
|
||||
client := testpb.NewTestServiceClient(cc)
|
||||
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
|
||||
defer cancel()
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
|
||||
t.Fatalf("EmptyCall() = %v, want <nil>", err)
|
||||
}
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
t.Fatalf("Timeout when waiting for metadata received in RPC")
|
||||
case md := <-testMDChan:
|
||||
if len(md) != 0 {
|
||||
t.Fatalf("received metadata %v, want nil", md)
|
||||
}
|
||||
}
|
||||
|
||||
// Send a resolver update with address attributes.
|
||||
addrWithAttributes := imetadata.Set(addr, metadata.Pairs(testMDKey, testMDValue))
|
||||
r.UpdateState(resolver.State{Addresses: []resolver.Address{addrWithAttributes}})
|
||||
|
||||
// Make an RPC and ensure it contains the metadata we are looking for. The
|
||||
// resolver update isn't processed synchronously, so we wait some time before
|
||||
// failing if some RPCs do not contain it.
|
||||
Done:
|
||||
for {
|
||||
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
|
||||
t.Fatalf("EmptyCall() = %v, want <nil>", err)
|
||||
}
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
t.Fatalf("Timeout when waiting for metadata received in RPC")
|
||||
case md := <-testMDChan:
|
||||
if len(md) == 1 && md[0] == testMDValue {
|
||||
break Done
|
||||
}
|
||||
}
|
||||
time.Sleep(defaultTestShortTimeout)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
/*
|
||||
*
|
||||
* 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 test
|
||||
|
||||
import "time"
|
||||
|
||||
const (
|
||||
// Default timeout for tests in this package.
|
||||
defaultTestTimeout = 10 * time.Second
|
||||
// Default short timeout, to be used when waiting for events which are not
|
||||
// expected to happen.
|
||||
defaultTestShortTimeout = 100 * time.Millisecond
|
||||
)
|
||||
Loading…
Reference in New Issue