mirror of https://github.com/grpc/grpc-go.git
122 lines
4.1 KiB
Go
122 lines
4.1 KiB
Go
/*
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*
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* Copyright 2019 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 grpc
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import (
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"fmt"
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"net"
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"testing"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/balancer/roundrobin"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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)
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var _ balancer.V2Balancer = &funcBalancer{}
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type funcBalancer struct {
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updateClientConnState func(s balancer.ClientConnState) error
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}
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func (*funcBalancer) HandleSubConnStateChange(balancer.SubConn, connectivity.State) {
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panic("unimplemented") // v1 API
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}
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func (*funcBalancer) HandleResolvedAddrs([]resolver.Address, error) {
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panic("unimplemented") // v1 API
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}
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func (b *funcBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
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return b.updateClientConnState(s)
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}
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func (*funcBalancer) ResolverError(error) {}
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func (*funcBalancer) UpdateSubConnState(balancer.SubConn, balancer.SubConnState) {
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panic("unimplemented") // we never have sub-conns
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}
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func (*funcBalancer) Close() {}
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type funcBalancerBuilder struct {
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name string
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instance *funcBalancer
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}
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func (b *funcBalancerBuilder) Build(balancer.ClientConn, balancer.BuildOptions) balancer.Balancer {
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return b.instance
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}
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func (b *funcBalancerBuilder) Name() string { return b.name }
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// TestBalancerErrorResolverPolling injects balancer errors and verifies
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// ResolveNow is called on the resolver with the appropriate backoff strategy
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// being consulted between ResolveNow calls.
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func (s) TestBalancerErrorResolverPolling(t *testing.T) {
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// The test balancer will return ErrBadResolverState iff the
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// ClientConnState contains no addresses.
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fb := &funcBalancer{
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updateClientConnState: func(s balancer.ClientConnState) error {
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if len(s.ResolverState.Addresses) == 0 {
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return balancer.ErrBadResolverState
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}
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return nil
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},
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}
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const balName = "BalancerErrorResolverPolling"
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balancer.Register(&funcBalancerBuilder{name: balName, instance: fb})
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testResolverErrorPolling(t,
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func(r *manual.Resolver) {
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// No addresses so the balancer will fail.
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r.CC.UpdateState(resolver.State{})
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}, func(r *manual.Resolver) {
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// UpdateState will block if ResolveNow is being called (which blocks on
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// rn), so call it in a goroutine. Include some address so the balancer
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// will be happy.
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go r.CC.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: "x"}}})
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},
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WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, balName)))
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}
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// TestRoundRobinZeroAddressesResolverPolling reports no addresses to the round
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// robin balancer and verifies ResolveNow is called on the resolver with the
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// appropriate backoff strategy being consulted between ResolveNow calls.
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func (s) TestRoundRobinZeroAddressesResolverPolling(t *testing.T) {
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// We need to start a real server or else the connecting loop will call
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// ResolveNow after every iteration, even after a valid resolver result is
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// returned.
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lis, err := net.Listen("tcp", "localhost:0")
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if err != nil {
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t.Fatalf("Error while listening. Err: %v", err)
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}
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defer lis.Close()
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s := NewServer()
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defer s.Stop()
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go s.Serve(lis)
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testResolverErrorPolling(t,
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func(r *manual.Resolver) {
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// No addresses so the balancer will fail.
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r.CC.UpdateState(resolver.State{})
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}, func(r *manual.Resolver) {
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// UpdateState will block if ResolveNow is being called (which
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// blocks on rn), so call it in a goroutine. Include a valid
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// address so the balancer will be happy.
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go r.CC.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: lis.Addr().String()}}})
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},
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WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, roundrobin.Name)))
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}
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