Calculate checksum by default in ReplicateRepositoryjc-replicate-checksums

5 files changed, 260 insertions, 59 deletions

diff --git a/internal/service/repository/replicate.go b/internal/service/repository/replicate.go
index 35080fafc..df07ea58c 100644
--- a/internal/service/repository/replicate.go
+++ b/internal/service/repository/replicate.go
@@ -44,8 +44,8 @@ func (s *server) ReplicateRepository(ctx context.Context, in *gitalypb.Replicate
 		}
 	}
 
-	g, ctx := errgroup.WithContext(ctx)
-	outgoingCtx := helper.IncomingToOutgoing(ctx)
+	g, replCtx := errgroup.WithContext(ctx)
+	outgoingCtx := helper.IncomingToOutgoing(replCtx)
 
 	for _, f := range syncFuncs {
 		f := f // rescoping f
@@ -56,6 +56,15 @@ func (s *server) ReplicateRepository(ctx context.Context, in *gitalypb.Replicate
 		return nil, helper.ErrInternal(err)
 	}
 
+	checksumsMatch, err := s.verifyChecksums(ctx, in)
+	if err != nil {
+		return nil, helper.ErrInternal(err)
+	}
+
+	if !checksumsMatch {
+		return nil, helper.ErrInternal(errors.New("checksums do not match after replication"))
+	}
+
 	return &gitalypb.ReplicateRepositoryResponse{}, nil
 }
 
@@ -223,6 +232,68 @@ func (s *server) syncInfoAttributes(ctx context.Context, in *gitalypb.ReplicateR
 	return os.Rename(attributesPath, attributesPath)
 }
 
+func (s *server) verifyChecksums(ctx context.Context, in *gitalypb.ReplicateRepositoryRequest) (bool, error) {
+	g, checksumCtx := errgroup.WithContext(ctx)
+	outgoingCtx := helper.IncomingToOutgoing(checksumCtx)
+
+	var checksums [2]string
+	if !in.GetSkipChecksum() {
+		g.Go(func() error {
+			client, err := s.newInternalRepoClient()
+			if err != nil {
+				return err
+			}
+
+			checksum, err := getChecksum(outgoingCtx, client, in.GetRepository())
+			if err != nil {
+				return err
+			}
+
+			checksums[0] = checksum
+			return nil
+		})
+		g.Go(func() error {
+			client, err := s.newRepoClient(outgoingCtx, in.GetSource().GetStorageName())
+			if err != nil {
+				return err
+			}
+
+			checksum, err := getChecksum(outgoingCtx, client, in.GetSource())
+			if err != nil {
+				return err
+			}
+
+			checksums[1] = checksum
+			return nil
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		return false, err
+	}
+
+	return checksumsMatch(checksums), nil
+}
+
+func checksumsMatch(checksums [2]string) bool {
+	if checksums[0] == "" || checksums[1] == "" {
+		return false
+	}
+
+	return checksums[0] == checksums[1]
+}
+
+func getChecksum(ctx context.Context, client gitalypb.RepositoryServiceClient, repository *gitalypb.Repository) (string, error) {
+	resp, err := client.CalculateChecksum(ctx, &gitalypb.CalculateChecksumRequest{
+		Repository: repository,
+	})
+	if err != nil {
+		return "", err
+	}
+
+	return resp.Checksum, nil
+}
+
 // newRemoteClient creates a new RemoteClient that talks to the same gitaly server
 func (s *server) newRemoteClient() (gitalypb.RemoteServiceClient, error) {
 	cc, err := s.getOrCreateConnection(fmt.Sprintf("unix:%s", s.internalGitalySocket), "")
@@ -233,6 +304,15 @@ func (s *server) newRemoteClient() (gitalypb.RemoteServiceClient, error) {
 	return gitalypb.NewRemoteServiceClient(cc), nil
 }
 
+func (s *server) newInternalRepoClient() (gitalypb.RepositoryServiceClient, error) {
+	cc, err := s.getOrCreateConnection(fmt.Sprintf("unix:%s", s.internalGitalySocket), "")
+	if err != nil {
+		return nil, err
+	}
+
+	return gitalypb.NewRepositoryServiceClient(cc), nil
+}
+
 // newRepoClient creates a new RepositoryClient that talks to the gitaly of the source repository
 func (s *server) newRepoClient(ctx context.Context, storageName string) (gitalypb.RepositoryServiceClient, error) {
 	conn, err := s.getConnectionByStorage(ctx, storageName)
diff --git a/internal/service/repository/replicate_test.go b/internal/service/repository/replicate_test.go
index 2dd9a8fbf..cfea9aea0 100644
--- a/internal/service/repository/replicate_test.go
+++ b/internal/service/repository/replicate_test.go
@@ -3,6 +3,7 @@ package repository_test
 import (
 	"bytes"
 	"context"
+	"crypto/sha1"
 	"fmt"
 	"io/ioutil"
 	"net"
@@ -15,6 +16,8 @@ import (
 	"gitlab.com/gitlab-org/gitaly/internal/config"
 	"gitlab.com/gitlab-org/gitaly/internal/helper"
 	"gitlab.com/gitlab-org/gitaly/internal/helper/text"
+	"gitlab.com/gitlab-org/gitaly/internal/rubyserver"
+	"gitlab.com/gitlab-org/gitaly/internal/service/remote"
 	"gitlab.com/gitlab-org/gitaly/internal/service/repository"
 	"gitlab.com/gitlab-org/gitaly/internal/testhelper"
 	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
@@ -315,6 +318,58 @@ func TestReplicateRepository_FailedFetchInternalRemote(t *testing.T) {
 	require.Error(t, err)
 }
 
+func TestReplicateRepository_BadChecksum(t *testing.T) {
+	tmpPath, cleanup := testhelper.TempDir(t, t.Name())
+	defer cleanup()
+
+	replicaPath := filepath.Join(tmpPath, "replica")
+	require.NoError(t, os.MkdirAll(replicaPath, 0755))
+
+	defer func(storages []config.Storage) {
+		config.Config.Storages = storages
+	}(config.Config.Storages)
+
+	config.Config.Storages = []config.Storage{
+		config.Storage{
+			Name: "default",
+			Path: testhelper.GitlabTestStoragePath(),
+		},
+		config.Storage{
+			Name: "replica",
+			Path: replicaPath,
+		},
+	}
+
+	server, serverSocketPath := runServerWithBadChecksum(t)
+	defer server.Stop()
+
+	testRepo, _, cleanupRepo := testhelper.NewTestRepo(t)
+	defer cleanupRepo()
+
+	config.Config.SocketPath = serverSocketPath
+
+	repoClient, conn := repository.NewRepositoryClient(t, serverSocketPath)
+	defer conn.Close()
+
+	targetRepo := *testRepo
+	targetRepo.StorageName = "replica"
+
+	ctx, cancel := testhelper.Context()
+	defer cancel()
+
+	md := testhelper.GitalyServersMetadata(t, serverSocketPath)
+	injectedCtx := metadata.NewOutgoingContext(ctx, md)
+
+	// first ReplicateRepository call will replicate via snapshot
+	_, err := repoClient.ReplicateRepository(injectedCtx, &gitalypb.ReplicateRepositoryRequest{
+		Repository: &targetRepo,
+		Source:     testRepo,
+	})
+	require.Error(t, err)
+	testhelper.RequireGrpcError(t, err, codes.Internal)
+	testhelper.GrpcErrorHasMessage(err, "checksums do not match after replication")
+}
+
 func runServerWithBadFetchInternalRemote(t *testing.T) (*grpc.Server, string) {
 	server := testhelper.NewTestGrpcServer(t, nil, nil)
 	serverSocketPath := testhelper.GetTemporaryGitalySocketFileName()
@@ -335,6 +390,61 @@ func runServerWithBadFetchInternalRemote(t *testing.T) (*grpc.Server, string) {
 	return server, "unix://" + serverSocketPath
 }
 
+func runServerWithBadChecksum(t *testing.T) (*grpc.Server, string) {
+	server := testhelper.NewTestGrpcServer(t, nil, nil)
+	serverSocketPath := testhelper.GetTemporaryGitalySocketFileName()
+
+	listener, err := net.Listen("unix", serverSocketPath)
+	require.NoError(t, err)
+	internalListener, err := net.Listen("unix", config.GitalyInternalSocketPath())
+	require.NoError(t, err)
+
+	repositoryServer := repository.NewServer(repository.RubyServer, config.GitalyInternalSocketPath())
+
+	gitalypb.RegisterRepositoryServiceServer(server, &mockRepoServer{
+		repositoryServer: repositoryServer,
+	})
+	gitalypb.RegisterRemoteServiceServer(server, remote.NewServer(&rubyserver.Server{}))
+	reflection.Register(server)
+
+	go server.Serve(listener)
+	go server.Serve(internalListener)
+
+	return server, "unix://" + serverSocketPath
+}
+
+type mockRepoServer struct {
+	repositoryServer gitalypb.RepositoryServiceServer
+	gitalypb.UnimplementedRepositoryServiceServer
+}
+
+func (m *mockRepoServer) GetSnapshot(in *gitalypb.GetSnapshotRequest, stream gitalypb.RepositoryService_GetSnapshotServer) error {
+	return m.repositoryServer.GetSnapshot(in, stream)
+}
+
+func (m *mockRepoServer) GetInfoAttributes(in *gitalypb.GetInfoAttributesRequest, stream gitalypb.RepositoryService_GetInfoAttributesServer) error {
+	return m.repositoryServer.GetInfoAttributes(in, stream)
+}
+
+func (m *mockRepoServer) ReplicateRepository(ctx context.Context, in *gitalypb.ReplicateRepositoryRequest) (*gitalypb.ReplicateRepositoryResponse, error) {
+	return m.repositoryServer.ReplicateRepository(ctx, in)
+}
+
+// CalculateChecksum returns random checksums
+func (m *mockRepoServer) CalculateChecksum(ctx context.Context, in *gitalypb.CalculateChecksumRequest) (*gitalypb.CalculateChecksumResponse, error) {
+	// generate a random checksum
+	h := sha1.New()
+	rand, err := text.RandomHex(2)
+	if err != nil {
+		return nil, err
+	}
+	h.Write([]byte(rand))
+
+	return &gitalypb.CalculateChecksumResponse{
+		Checksum: fmt.Sprintf("%x", h.Sum(nil)),
+	}, nil
+}
+
 type mockRemoteServer struct {
 	gitalypb.UnimplementedRemoteServiceServer
 }
diff --git a/proto/go/gitalypb/repository-service.pb.go b/proto/go/gitalypb/repository-service.pb.go
index 6761f8307..2a7c893a1 100644
--- a/proto/go/gitalypb/repository-service.pb.go
+++ b/proto/go/gitalypb/repository-service.pb.go
@@ -3659,6 +3659,7 @@ var xxx_messageInfo_RenameRepositoryResponse proto.InternalMessageInfo
 type ReplicateRepositoryRequest struct {
 	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	Source               *Repository `protobuf:"bytes,2,opt,name=source,proto3" json:"source,omitempty"`
+	SkipChecksum         bool        `protobuf:"varint,3,opt,name=skip_checksum,json=skipChecksum,proto3" json:"skip_checksum,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
 	XXX_unrecognized     []byte      `json:"-"`
 	XXX_sizecache        int32       `json:"-"`
@@ -3703,6 +3704,13 @@ func (m *ReplicateRepositoryRequest) GetSource() *Repository {
 	return nil
 }
 
+func (m *ReplicateRepositoryRequest) GetSkipChecksum() bool {
+	if m != nil {
+		return m.SkipChecksum
+	}
+	return false
+}
+
 type ReplicateRepositoryResponse struct {
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
@@ -3825,19 +3833,19 @@ func init() {
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor_e9b1768cf174c79b) }
 
 var fileDescriptor_e9b1768cf174c79b = []byte{
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 	0x2c, 0x00, 0x00,
 }
 
diff --git a/proto/repository-service.proto b/proto/repository-service.proto
index 62e774127..dec8f20e7 100644
--- a/proto/repository-service.proto
+++ b/proto/repository-service.proto
@@ -602,6 +602,7 @@ message RenameRepositoryResponse{
 message ReplicateRepositoryRequest {
   Repository repository = 1 [(target_repository)=true];
   Repository source = 2;
+  bool skip_checksum = 3;
 }
 
 message ReplicateRepositoryResponse{}
diff --git a/ruby/proto/gitaly/repository-service_pb.rb b/ruby/proto/gitaly/repository-service_pb.rb
index cfec493d6..fe9068289 100644
--- a/ruby/proto/gitaly/repository-service_pb.rb
+++ b/ruby/proto/gitaly/repository-service_pb.rb
@@ -313,6 +313,7 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
   add_message "gitaly.ReplicateRepositoryRequest" do
     optional :repository, :message, 1, "gitaly.Repository"
     optional :source, :message, 2, "gitaly.Repository"
+    optional :skip_checksum, :bool, 3
   end
   add_message "gitaly.ReplicateRepositoryResponse" do
   end