mirror of https://github.com/grpc/grpc-go.git
127 lines
4.1 KiB
Go
127 lines
4.1 KiB
Go
/*
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*
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* Copyright 2023 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 test
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import (
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"context"
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"errors"
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"fmt"
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"testing"
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"google.golang.org/grpc"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/balancer/base"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/internal/balancer/stub"
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"google.golang.org/grpc/internal/stubserver"
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"google.golang.org/grpc/internal/testutils"
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testpb "google.golang.org/grpc/interop/grpc_testing"
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"google.golang.org/grpc/resolver"
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)
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type tsccPicker struct {
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sc balancer.SubConn
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}
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func (p *tsccPicker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
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return balancer.PickResult{SubConn: p.sc}, nil
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}
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// TestSubConnEmpty tests that removing all addresses from a SubConn and then
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// re-adding them does not cause a panic and properly reconnects.
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func (s) TestSubConnEmpty(t *testing.T) {
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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// sc is the one SubConn used throughout the test. Created on demand and
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// re-used on every update.
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var sc balancer.SubConn
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// Simple custom balancer that sets the address list to empty if the
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// resolver produces no addresses. Pickfirst, by default, will remove the
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// SubConn in this case instead.
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bal := stub.BalancerFuncs{
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UpdateClientConnState: func(d *stub.BalancerData, ccs balancer.ClientConnState) error {
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if sc == nil {
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var err error
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sc, err = d.ClientConn.NewSubConn(ccs.ResolverState.Addresses, balancer.NewSubConnOptions{
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StateListener: func(state balancer.SubConnState) {
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switch state.ConnectivityState {
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case connectivity.Ready:
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d.ClientConn.UpdateState(balancer.State{
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ConnectivityState: connectivity.Ready,
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Picker: &tsccPicker{sc: sc},
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})
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case connectivity.TransientFailure:
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d.ClientConn.UpdateState(balancer.State{
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ConnectivityState: connectivity.TransientFailure,
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Picker: base.NewErrPicker(fmt.Errorf("error connecting: %v", state.ConnectionError)),
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})
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}
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},
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})
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if err != nil {
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t.Errorf("error creating initial subconn: %v", err)
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}
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} else {
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d.ClientConn.UpdateAddresses(sc, ccs.ResolverState.Addresses)
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}
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sc.Connect()
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if len(ccs.ResolverState.Addresses) == 0 {
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d.ClientConn.UpdateState(balancer.State{
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ConnectivityState: connectivity.TransientFailure,
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Picker: base.NewErrPicker(errors.New("no addresses")),
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})
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} else {
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d.ClientConn.UpdateState(balancer.State{
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ConnectivityState: connectivity.Connecting,
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Picker: &tsccPicker{sc: sc},
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})
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}
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return nil
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},
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}
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stub.Register("tscc", bal)
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// Start the stub server with our stub balancer.
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ss := &stubserver.StubServer{
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EmptyCallF: func(context.Context, *testpb.Empty) (*testpb.Empty, error) {
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return &testpb.Empty{}, nil
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},
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}
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if err := ss.Start(nil, grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"tscc":{}}]}`)); err != nil {
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t.Fatalf("Error starting server: %v", err)
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}
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defer ss.Stop()
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if _, err := ss.Client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall failed: %v", err)
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}
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t.Log("Removing addresses from resolver and SubConn")
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ss.R.UpdateState(resolver.State{Addresses: []resolver.Address{}})
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testutils.AwaitState(ctx, t, ss.CC, connectivity.TransientFailure)
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t.Log("Re-adding addresses to resolver and SubConn")
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ss.R.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: ss.Address}}})
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if _, err := ss.Client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall failed: %v", err)
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}
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}
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