google.golang.org/grpc@v1.72.2/xds/internal/xdsclient/transport/grpctransport/grpctransport_ext_test.go (about)

     1  /*
     2   *
     3   * Copyright 2024 gRPC authors.
     4   *
     5   * Licensed under the Apache License, Version 2.0 (the "License");
     6   * you may not use this file except in compliance with the License.
     7   * You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package grpctransport_test
    19  
    20  import (
    21  	"testing"
    22  
    23  	"google.golang.org/grpc"
    24  	"google.golang.org/grpc/internal/grpctest"
    25  	internalbootstrap "google.golang.org/grpc/internal/xds/bootstrap"
    26  	"google.golang.org/grpc/xds/internal/xdsclient/internal"
    27  	"google.golang.org/grpc/xds/internal/xdsclient/transport"
    28  	"google.golang.org/grpc/xds/internal/xdsclient/transport/grpctransport"
    29  )
    30  
    31  type s struct {
    32  	grpctest.Tester
    33  }
    34  
    35  func Test(t *testing.T) {
    36  	grpctest.RunSubTests(t, s{})
    37  }
    38  
    39  // Tests that the grpctransport.Builder creates a new grpc.ClientConn every time
    40  // Build() is called.
    41  func (s) TestBuild_CustomDialer(t *testing.T) {
    42  	// Override the dialer with a custom one.
    43  	customDialerCalled := false
    44  	origDialer := internal.GRPCNewClient
    45  	internal.GRPCNewClient = func(target string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
    46  		customDialerCalled = true
    47  		return grpc.NewClient(target, opts...)
    48  	}
    49  	defer func() { internal.GRPCNewClient = origDialer }()
    50  
    51  	serverCfg, err := internalbootstrap.ServerConfigForTesting(internalbootstrap.ServerConfigTestingOptions{URI: "server-address"})
    52  	if err != nil {
    53  		t.Fatalf("Failed to create server config for testing: %v", err)
    54  	}
    55  
    56  	// Create a new transport and ensure that the custom dialer was called.
    57  	opts := transport.BuildOptions{ServerConfig: serverCfg}
    58  	builder := &grpctransport.Builder{}
    59  	tr, err := builder.Build(opts)
    60  	if err != nil {
    61  		t.Fatalf("Builder.Build(%+v) failed: %v", opts, err)
    62  	}
    63  	defer tr.Close()
    64  
    65  	if !customDialerCalled {
    66  		t.Fatalf("Builder.Build(%+v): custom dialer called = false, want true", opts)
    67  	}
    68  	customDialerCalled = false
    69  
    70  	// Create another transport and ensure that the custom dialer was called.
    71  	tr, err = builder.Build(opts)
    72  	if err != nil {
    73  		t.Fatalf("Builder.Build(%+v) failed: %v", opts, err)
    74  	}
    75  	defer tr.Close()
    76  
    77  	if !customDialerCalled {
    78  		t.Fatalf("Builder.Build(%+v): custom dialer called = false, want true", opts)
    79  	}
    80  }
    81  
    82  // Tests that the grpctransport.Builder fails to build a transport when the
    83  // provided BuildOptions do not contain a ServerConfig.
    84  func (s) TestBuild_EmptyServerConfig(t *testing.T) {
    85  	builder := &grpctransport.Builder{}
    86  	opts := transport.BuildOptions{}
    87  	if tr, err := builder.Build(opts); err == nil {
    88  		tr.Close()
    89  		t.Fatalf("Builder.Build(%+v) succeeded when expected to fail", opts)
    90  	}
    91  }