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grpc.go
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grpc.go
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// Copyright 2020 Anapaya Systems
//
// 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 xtest
import (
"context"
"errors"
"net"
"testing"
"github.com/stretchr/testify/assert"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/test/bufconn"
)
type grpcServiceOptions struct {
clientCredentials credentials.TransportCredentials
serverCredentials credentials.TransportCredentials
}
type GRPCServiceOption func(*grpcServiceOptions)
func WithCredentials(client, server credentials.TransportCredentials) func(*grpcServiceOptions) {
return func(opts *grpcServiceOptions) {
opts.clientCredentials = client
opts.serverCredentials = server
}
}
func WithInsecureCredentials() func(*grpcServiceOptions) {
return func(opts *grpcServiceOptions) {
opts.clientCredentials = insecure.NewCredentials()
}
}
type GRPCService struct {
listener *bufconn.Listener
server *grpc.Server
clientCredentials credentials.TransportCredentials
}
func NewGRPCService(options ...GRPCServiceOption) *GRPCService {
opts := grpcServiceOptions{}
for _, opt := range options {
opt(&opts)
}
return &GRPCService{
listener: bufconn.Listen(1024 * 1024),
server: grpc.NewServer(grpc.Creds(opts.serverCredentials)),
clientCredentials: opts.clientCredentials,
}
}
func (s *GRPCService) Server() *grpc.Server {
return s.server
}
func (s *GRPCService) Start(t *testing.T) {
var bg errgroup.Group
bg.Go(func() error {
return s.server.Serve(s.listener)
})
t.Cleanup(func() {
s.server.Stop()
err := bg.Wait()
if errors.Is(err, grpc.ErrServerStopped) {
// Can (only) occur if Stop in the test cleanup is called before
// server has started. This can happen if the test does not
// actually use the server.
return
}
assert.NoError(t, err)
})
}
func (s *GRPCService) Dial(ctx context.Context, addr net.Addr) (*grpc.ClientConn, error) {
transportSecurity := grpc.WithInsecure()
if s.clientCredentials != nil {
transportSecurity = grpc.WithTransportCredentials(s.clientCredentials)
}
return grpc.DialContext(ctx, addr.String(),
grpc.WithContextDialer(
func(context.Context, string) (net.Conn, error) {
return s.listener.Dial()
},
),
transportSecurity,
)
}