github.com/m3db/m3@v1.5.0/src/query/remote/static_resolver_test.go (about)

     1  // Copyright (c) 2022 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
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     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package remote
    22  
    23  import (
    24  	"context"
    25  	"net"
    26  	"testing"
    27  	"time"
    28  
    29  	"github.com/stretchr/testify/require"
    30  	"google.golang.org/grpc"
    31  )
    32  
    33  // Test_staticResolver is a very basic test that staticResolver works. See TestRoundRobinClientRpc
    34  // for a test of round-robin behavior.
    35  func Test_staticResolver(t *testing.T) {
    36  	// startGRPCServer starts a server on a random port. It handles cleanup as well.
    37  	startGRPCServer := func(t *testing.T) net.Addr {
    38  		lis, err := net.Listen("tcp", "127.0.0.1:0")
    39  		require.NoError(t, err)
    40  
    41  		// N.B.: server.Stop closes the listener too.
    42  
    43  		server := grpc.NewServer()
    44  		// No need to explicitly wait for server to be up; GRPC dial will do that for us (retry until up)
    45  		go func() {
    46  			require.NoError(t, server.Serve(lis))
    47  		}()
    48  		t.Cleanup(server.Stop)
    49  		return lis.Addr()
    50  	}
    51  
    52  	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    53  	defer cancel()
    54  	addr := startGRPCServer(t)
    55  	_, err := grpc.DialContext(
    56  		ctx,
    57  		_staticResolverURL,
    58  		grpc.WithResolvers(newStaticResolverBuilder([]string{addr.String()})),
    59  		grpc.WithInsecure(),
    60  		grpc.WithBlock(),
    61  	)
    62  
    63  	require.NoError(t, err)
    64  }