github.com/lfch/etcd-io/tests/v3@v3.0.0-20221004140520-eac99acd3e9d/integration/clientv3/naming/resolver_test.go (about)

     1  // Copyright 2016 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package naming_test
    16  
    17  import (
    18  	"bytes"
    19  	"context"
    20  	"testing"
    21  	"time"
    22  
    23  	"github.com/lfch/etcd-io/client/v3/naming/endpoints"
    24  	"github.com/lfch/etcd-io/client/v3/naming/resolver"
    25  	"github.com/lfch/etcd-io/pkg/v3/grpc_testing"
    26  	integration2 "github.com/lfch/etcd-io/tests/v3/framework/integration"
    27  	"google.golang.org/grpc"
    28  	testpb "google.golang.org/grpc/test/grpc_testing"
    29  )
    30  
    31  // This test mimics scenario described in grpc_naming.md doc.
    32  
    33  func TestEtcdGrpcResolver(t *testing.T) {
    34  	integration2.BeforeTest(t)
    35  
    36  	s1PayloadBody := []byte{'1'}
    37  	s1 := grpc_testing.NewDummyStubServer(s1PayloadBody)
    38  	if err := s1.Start(nil); err != nil {
    39  		t.Fatal("failed to start dummy grpc server (s1)", err)
    40  	}
    41  	defer s1.Stop()
    42  
    43  	s2PayloadBody := []byte{'2'}
    44  	s2 := grpc_testing.NewDummyStubServer(s2PayloadBody)
    45  	if err := s2.Start(nil); err != nil {
    46  		t.Fatal("failed to start dummy grpc server (s2)", err)
    47  	}
    48  	defer s2.Stop()
    49  
    50  	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 3})
    51  	defer clus.Terminate(t)
    52  
    53  	em, err := endpoints.NewManager(clus.Client(0), "foo")
    54  	if err != nil {
    55  		t.Fatal("failed to create EndpointManager", err)
    56  	}
    57  
    58  	e1 := endpoints.Endpoint{Addr: s1.Addr()}
    59  	e2 := endpoints.Endpoint{Addr: s2.Addr()}
    60  
    61  	err = em.AddEndpoint(context.TODO(), "foo/e1", e1)
    62  	if err != nil {
    63  		t.Fatal("failed to add foo", err)
    64  	}
    65  
    66  	b, err := resolver.NewBuilder(clus.Client(1))
    67  	if err != nil {
    68  		t.Fatal("failed to new resolver builder", err)
    69  	}
    70  
    71  	conn, err := grpc.Dial("etcd:///foo", grpc.WithInsecure(), grpc.WithResolvers(b))
    72  	if err != nil {
    73  		t.Fatal("failed to connect to foo", err)
    74  	}
    75  	defer conn.Close()
    76  
    77  	c := testpb.NewTestServiceClient(conn)
    78  	resp, err := c.UnaryCall(context.TODO(), &testpb.SimpleRequest{}, grpc.WaitForReady(true))
    79  	if err != nil {
    80  		t.Fatal("failed to invoke rpc to foo (e1)", err)
    81  	}
    82  	if resp.GetPayload() == nil || !bytes.Equal(resp.GetPayload().GetBody(), s1PayloadBody) {
    83  		t.Fatalf("unexpected response from foo (e1): %s", resp.GetPayload().GetBody())
    84  	}
    85  
    86  	em.DeleteEndpoint(context.TODO(), "foo/e1")
    87  	em.AddEndpoint(context.TODO(), "foo/e2", e2)
    88  
    89  	// We use a loop with deadline of 30s to avoid test getting flake
    90  	// as it's asynchronous for gRPC Client to update underlying connections.
    91  	maxRetries := 300
    92  	retryPeriod := 100 * time.Millisecond
    93  	retries := 0
    94  	for {
    95  		time.Sleep(retryPeriod)
    96  		retries++
    97  
    98  		resp, err = c.UnaryCall(context.TODO(), &testpb.SimpleRequest{})
    99  		if err != nil {
   100  			if retries < maxRetries {
   101  				continue
   102  			}
   103  			t.Fatal("failed to invoke rpc to foo (e2)", err)
   104  		}
   105  		if resp.GetPayload() == nil || !bytes.Equal(resp.GetPayload().GetBody(), s2PayloadBody) {
   106  			if retries < maxRetries {
   107  				continue
   108  			}
   109  			t.Fatalf("unexpected response from foo (e2): %s", resp.GetPayload().GetBody())
   110  		}
   111  		break
   112  	}
   113  }