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reflection.go
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reflection.go
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// Copyright (c) 2022 The Jaeger Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpctest
import (
"context"
"testing"
"github.com/stretchr/testify/require"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
grpc_reflection "google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
)
// ReflectionServiceValidator verifies that a gRPC service at a given address
// supports reflection service. Called must invoke Execute func.
type ReflectionServiceValidator struct {
Server *grpc.Server
HostPort string
ExpectedServices []string
}
// Execute performs validation.
func (v ReflectionServiceValidator) Execute(t *testing.T) {
conn, err := grpc.NewClient(
v.HostPort,
grpc.WithTransportCredentials(insecure.NewCredentials()))
require.NoError(t, err)
defer conn.Close()
client := grpc_reflection.NewServerReflectionClient(conn)
r, err := client.ServerReflectionInfo(context.Background())
require.NoError(t, err)
require.NotNil(t, r)
err = r.Send(&grpc_reflection.ServerReflectionRequest{
MessageRequest: &grpc_reflection.ServerReflectionRequest_ListServices{},
})
require.NoError(t, err)
m, err := r.Recv()
require.NoError(t, err)
require.IsType(t,
new(grpc_reflection.ServerReflectionResponse_ListServicesResponse),
m.MessageResponse)
resp := m.MessageResponse.(*grpc_reflection.ServerReflectionResponse_ListServicesResponse)
for _, svc := range v.ExpectedServices {
var found string
for _, s := range resp.ListServicesResponse.Service {
if svc == s.Name {
found = s.Name
break
}
}
require.Equalf(t, svc, found,
"service not found, got '%+v'",
resp.ListServicesResponse.Service)
}
}