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grpc_mock.go
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grpc_mock.go
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// Copyright 2021 Layotto 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 pluggable
import (
"context"
"fmt"
"net"
"os"
"github.com/pkg/errors"
guuid "github.com/google/uuid"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/test/bufconn"
)
const bufSize = 1024 * 1024
// TestServerFor returns a grpcServer factory that bootstraps a grpcserver backed by a buf connection (in memory), and returns the given clientFactory instance to communicate with it.
// it also provides cleanup function for close the grpcserver and client connection.
//
// usage,
// serverFactory := TestServerFor(proto.RegisterMyService, proto.NewMyServiceClient)
// client, cleanup, err := serverFactory(&your_service{})
// require.NoError(t, err)
// defer cleanup()
func TestServerFor[TServer any, TClient any](registersvc func(grpc.ServiceRegistrar, TServer), clientFactory func(grpc.ClientConnInterface) TClient) func(svc TServer) (client TClient, cleanup func(), err error) {
return func(srv TServer) (client TClient, cleanup func(), err error) {
lis := bufconn.Listen(bufSize)
s := grpc.NewServer()
registersvc(s, srv)
go func() {
if serveErr := s.Serve(lis); serveErr != nil && serveErr.Error() != "closed" {
panic(serveErr)
}
}()
ctx := context.Background()
conn, err := grpc.DialContext(
ctx,
"bufnet",
grpc.WithContextDialer(dial(lis)),
grpc.WithTransportCredentials(insecure.NewCredentials()),
)
if err != nil {
var zero TClient
return zero, nil, err
}
return clientFactory(conn), func() {
lis.Close()
conn.Close()
}, nil
}
}
// TestSocketServerFor returns a grpcServer factory that bootstraps a grpcserver backed by grpc socket, and returns the given clientFactory instance to communicate with it.
// it also provides cleanup function for close the grpcserver and client connection. The closure of dial needs to be handled by the user themselves
//
// usage,
// serverFactory := TestSocketServerFor(proto.RegisterMyService, NewGRPCHello) // (func NewGRPCHello(dialer pluggable.GRPCConnectionDialer) *grpcHello)
// client, cleanup, err := serverFactory(&your_service{})
// require.NoError(t, err)
// defer cleanup()
//
func TestSocketServerFor[TServer any, TClient any](registersvc func(grpc.ServiceRegistrar, TServer), clientFactory func(GRPCConnectionDialer) TClient) func(svc TServer) (client TClient, cleanup func(), err error) {
return func(srv TServer) (client TClient, cleanup func(), err error) {
const fakeSocketFolder = "/tmp"
uniqueID := guuid.New().String()
socket := fmt.Sprintf("%s/%s.sock", fakeSocketFolder, uniqueID)
lis, err := net.Listen("unix", socket)
if err != nil {
var zero TClient
return zero, nil, err
}
s := grpc.NewServer()
registersvc(s, srv)
go func() {
if serveErr := s.Serve(lis); serveErr != nil && !errors.Is(serveErr, net.ErrClosed) {
panic(err)
}
}()
dialer := SocketDialer(socket)
return clientFactory(dialer), func() {
lis.Close()
os.Remove(socket)
}, nil
}
}
func dial(lis *bufconn.Listener) func(ctx context.Context, s string) (net.Conn, error) {
return func(ctx context.Context, s string) (net.Conn, error) {
return lis.Dial()
}
}