Implement RepositorySize RPC

Closes #436

9 files changed, 236 insertions, 28 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7d9134b1..f53d96aef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ UNRELEASED
 
 - Increase gitaly-ruby connection timeout to 20s
   https://gitlab.com/gitlab-org/gitaly/merge_requests/265
+- Implement RepositorySize RPC
+  https://gitlab.com/gitlab-org/gitaly/merge_requests/262
 
 v0.27.0
 
diff --git a/internal/service/repository/size.go b/internal/service/repository/size.go
new file mode 100644
index 000000000..a54440097
--- /dev/null
+++ b/internal/service/repository/size.go
@@ -0,0 +1,57 @@
+package repository
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os/exec"
+	"strconv"
+
+	"gitlab.com/gitlab-org/gitaly/internal/helper"
+
+	pb "gitlab.com/gitlab-org/gitaly-proto/go"
+
+	"github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus"
+	"golang.org/x/net/context"
+)
+
+func (s *server) RepositorySize(ctx context.Context, in *pb.RepositorySizeRequest) (*pb.RepositorySizeResponse, error) {
+	path, err := helper.GetPath(in.Repository)
+	if err != nil {
+		return nil, err
+	}
+
+	cmd, err := helper.NewCommand(ctx, exec.Command("du", "-sk", path), nil, nil, nil)
+	if err != nil {
+		grpc_logrus.Extract(ctx).WithError(err).Warn("ignoring du command error")
+		return repositorySizeResponse(0), nil
+	}
+
+	sizeLine, err := ioutil.ReadAll(cmd)
+	if err != nil {
+		grpc_logrus.Extract(ctx).WithError(err).Warn("ignoring command read error")
+		return repositorySizeResponse(0), nil
+	}
+
+	if err := cmd.Wait(); err != nil {
+		grpc_logrus.Extract(ctx).WithError(err).Warn("ignoring du wait error")
+		return repositorySizeResponse(0), nil
+	}
+
+	sizeParts := bytes.Split(sizeLine, []byte("\t"))
+	if len(sizeParts) != 2 {
+		grpc_logrus.Extract(ctx).Warn("ignoring du malformed output: %q", sizeLine)
+		return repositorySizeResponse(0), nil
+	}
+
+	size, err := strconv.ParseInt(string(sizeParts[0]), 10, 0)
+	if err != nil {
+		grpc_logrus.Extract(ctx).WithError(err).Warn("ignoring parsing size error")
+		return repositorySizeResponse(0), nil
+	}
+
+	return repositorySizeResponse(size), nil
+}
+
+func repositorySizeResponse(size int64) *pb.RepositorySizeResponse {
+	return &pb.RepositorySizeResponse{Size: size}
+}
diff --git a/internal/service/repository/size_test.go b/internal/service/repository/size_test.go
new file mode 100644
index 000000000..c5d55c66f
--- /dev/null
+++ b/internal/service/repository/size_test.go
@@ -0,0 +1,71 @@
+package repository
+
+import (
+	"os"
+	"path"
+	"testing"
+
+	"gitlab.com/gitlab-org/gitaly/internal/config"
+	"gitlab.com/gitlab-org/gitaly/internal/testhelper"
+
+	pb "gitlab.com/gitlab-org/gitaly-proto/go"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc/codes"
+)
+
+func TestSuccessfulRepositorySizeRequest(t *testing.T) {
+	client := newRepositoryClient(t)
+	server := runRepoServer(t)
+	defer server.Stop()
+
+	storageName := "default"
+	storagePath, found := config.StoragePath(storageName)
+	if !found {
+		t.Fatalf("No %q storage was found", storageName)
+	}
+
+	repoCopyPath := path.Join(storagePath, "fixed-size-repo.git")
+	testhelper.MustRunCommand(t, nil, "cp", "-R", "testdata/fixed-size-repo.git", repoCopyPath)
+	defer os.RemoveAll(repoCopyPath)
+
+	request := &pb.RepositorySizeRequest{
+		Repository: &pb.Repository{
+			StorageName:  storageName,
+			RelativePath: "fixed-size-repo.git",
+		},
+	}
+
+	response, err := client.RepositorySize(context.Background(), request)
+	require.NoError(t, err)
+	// We can't test for an exact size because it will be different for systems with different sector sizes,
+	// so we settle for anything greater than zero.
+	require.True(t, response.Size > 0, "size must be greater than zero")
+}
+
+func TestFailedRepositorySizeRequest(t *testing.T) {
+	client := newRepositoryClient(t)
+	server := runRepoServer(t)
+	defer server.Stop()
+
+	invalidRepo := &pb.Repository{StorageName: "fake", RelativePath: "path"}
+
+	testCases := []struct {
+		description string
+		repo        *pb.Repository
+	}{
+		{repo: invalidRepo, description: "Invalid repo"},
+	}
+
+	for _, testCase := range testCases {
+		t.Logf("test case: %q", testCase.description)
+
+		request := &pb.RepositorySizeRequest{
+			Repository: testCase.repo,
+		}
+
+		_, err := client.RepositorySize(context.Background(), request)
+		testhelper.AssertGrpcError(t, err, codes.InvalidArgument, "")
+	}
+}
diff --git a/internal/service/repository/testdata/fixed-size-repo.git/HEAD b/internal/service/repository/testdata/fixed-size-repo.git/HEAD
new file mode 100644
index 000000000..cb089cd89
--- /dev/null
+++ b/internal/service/repository/testdata/fixed-size-repo.git/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/master
diff --git a/internal/service/repository/testdata/fixed-size-repo.git/config b/internal/service/repository/testdata/fixed-size-repo.git/config
new file mode 100644
index 000000000..07d359d07
--- /dev/null
+++ b/internal/service/repository/testdata/fixed-size-repo.git/config
@@ -0,0 +1,4 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true
diff --git a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/VERSION b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/VERSION
index 2094a100c..d21d277be 100644
--- a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/VERSION
+++ b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/VERSION
@@ -1 +1 @@
-0.24.0
+0.25.0
diff --git a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/blob.pb.go b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/blob.pb.go
index e29077081..20c8f3f8b 100644
--- a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/blob.pb.go
+++ b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/blob.pb.go
@@ -75,6 +75,8 @@ It has these top-level messages:
 	RepackFullResponse
 	GarbageCollectRequest
 	GarbageCollectResponse
+	RepositorySizeRequest
+	RepositorySizeResponse
 	Repository
 	GitCommit
 	CommitAuthor
diff --git a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/repository-service.pb.go b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/repository-service.pb.go
index 6c544d7db..39228adad 100644
--- a/vendor/gitlab.com/gitlab-org/gitaly-proto/go/repository-service.pb.go
+++ b/vendor/gitlab.com/gitlab-org/gitaly-proto/go/repository-service.pb.go
@@ -137,6 +137,39 @@ func (m *GarbageCollectResponse) String() string            { return proto.Compa
 func (*GarbageCollectResponse) ProtoMessage()               {}
 func (*GarbageCollectResponse) Descriptor() ([]byte, []int) { return fileDescriptor6, []int{7} }
 
+type RepositorySizeRequest struct {
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository" json:"repository,omitempty"`
+}
+
+func (m *RepositorySizeRequest) Reset()                    { *m = RepositorySizeRequest{} }
+func (m *RepositorySizeRequest) String() string            { return proto.CompactTextString(m) }
+func (*RepositorySizeRequest) ProtoMessage()               {}
+func (*RepositorySizeRequest) Descriptor() ([]byte, []int) { return fileDescriptor6, []int{8} }
+
+func (m *RepositorySizeRequest) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+type RepositorySizeResponse struct {
+	// Repository size in kilobytes
+	Size int64 `protobuf:"varint,1,opt,name=size" json:"size,omitempty"`
+}
+
+func (m *RepositorySizeResponse) Reset()                    { *m = RepositorySizeResponse{} }
+func (m *RepositorySizeResponse) String() string            { return proto.CompactTextString(m) }
+func (*RepositorySizeResponse) ProtoMessage()               {}
+func (*RepositorySizeResponse) Descriptor() ([]byte, []int) { return fileDescriptor6, []int{9} }
+
+func (m *RepositorySizeResponse) GetSize() int64 {
+	if m != nil {
+		return m.Size
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*RepositoryExistsRequest)(nil), "gitaly.RepositoryExistsRequest")
 	proto.RegisterType((*RepositoryExistsResponse)(nil), "gitaly.RepositoryExistsResponse")
@@ -146,6 +179,8 @@ func init() {
 	proto.RegisterType((*RepackFullResponse)(nil), "gitaly.RepackFullResponse")
 	proto.RegisterType((*GarbageCollectRequest)(nil), "gitaly.GarbageCollectRequest")
 	proto.RegisterType((*GarbageCollectResponse)(nil), "gitaly.GarbageCollectResponse")
+	proto.RegisterType((*RepositorySizeRequest)(nil), "gitaly.RepositorySizeRequest")
+	proto.RegisterType((*RepositorySizeResponse)(nil), "gitaly.RepositorySizeResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -163,6 +198,7 @@ type RepositoryServiceClient interface {
 	RepackIncremental(ctx context.Context, in *RepackIncrementalRequest, opts ...grpc.CallOption) (*RepackIncrementalResponse, error)
 	RepackFull(ctx context.Context, in *RepackFullRequest, opts ...grpc.CallOption) (*RepackFullResponse, error)
 	GarbageCollect(ctx context.Context, in *GarbageCollectRequest, opts ...grpc.CallOption) (*GarbageCollectResponse, error)
+	RepositorySize(ctx context.Context, in *RepositorySizeRequest, opts ...grpc.CallOption) (*RepositorySizeResponse, error)
 	// Deprecated, use the RepositoryExists RPC instead.
 	Exists(ctx context.Context, in *RepositoryExistsRequest, opts ...grpc.CallOption) (*RepositoryExistsResponse, error)
 }
@@ -211,6 +247,15 @@ func (c *repositoryServiceClient) GarbageCollect(ctx context.Context, in *Garbag
 	return out, nil
 }
 
+func (c *repositoryServiceClient) RepositorySize(ctx context.Context, in *RepositorySizeRequest, opts ...grpc.CallOption) (*RepositorySizeResponse, error) {
+	out := new(RepositorySizeResponse)
+	err := grpc.Invoke(ctx, "/gitaly.RepositoryService/RepositorySize", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *repositoryServiceClient) Exists(ctx context.Context, in *RepositoryExistsRequest, opts ...grpc.CallOption) (*RepositoryExistsResponse, error) {
 	out := new(RepositoryExistsResponse)
 	err := grpc.Invoke(ctx, "/gitaly.RepositoryService/Exists", in, out, c.cc, opts...)
@@ -227,6 +272,7 @@ type RepositoryServiceServer interface {
 	RepackIncremental(context.Context, *RepackIncrementalRequest) (*RepackIncrementalResponse, error)
 	RepackFull(context.Context, *RepackFullRequest) (*RepackFullResponse, error)
 	GarbageCollect(context.Context, *GarbageCollectRequest) (*GarbageCollectResponse, error)
+	RepositorySize(context.Context, *RepositorySizeRequest) (*RepositorySizeResponse, error)
 	// Deprecated, use the RepositoryExists RPC instead.
 	Exists(context.Context, *RepositoryExistsRequest) (*RepositoryExistsResponse, error)
 }
@@ -307,6 +353,24 @@ func _RepositoryService_GarbageCollect_Handler(srv interface{}, ctx context.Cont
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RepositoryService_RepositorySize_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RepositorySizeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RepositoryServiceServer).RepositorySize(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/gitaly.RepositoryService/RepositorySize",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RepositoryServiceServer).RepositorySize(ctx, req.(*RepositorySizeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _RepositoryService_Exists_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(RepositoryExistsRequest)
 	if err := dec(in); err != nil {
@@ -346,6 +410,10 @@ var _RepositoryService_serviceDesc = grpc.ServiceDesc{
 			Handler:    _RepositoryService_GarbageCollect_Handler,
 		},
 		{
+			MethodName: "RepositorySize",
+			Handler:    _RepositoryService_RepositorySize_Handler,
+		},
+		{
 			MethodName: "Exists",
 			Handler:    _RepositoryService_Exists_Handler,
 		},
@@ -357,26 +425,29 @@ var _RepositoryService_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor6) }
 
 var fileDescriptor6 = []byte{
-	// 330 bytes of a gzipped FileDescriptorProto
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-	0xff, 0xff, 0x92, 0x5a, 0xad, 0x44, 0xec, 0x03, 0x00, 0x00,
+	// 370 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x94, 0x41, 0x4f, 0xfa, 0x40,
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+	0x54, 0xd2, 0xa7, 0xf7, 0x31, 0x49, 0x85, 0x1e, 0x40, 0x06, 0xb3, 0xab, 0xed, 0xea, 0xc9, 0xba,
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+	0x32, 0xa4, 0xd1, 0xf7, 0x0c, 0x69, 0x76, 0xd2, 0xad, 0x60, 0x0f, 0xac, 0x5f, 0xf4, 0xa5, 0x6f,
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+	0x00, 0x00,
 }
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 33665d290..5771a1740 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -191,12 +191,12 @@
 			"revisionTime": "2017-01-30T11:31:45Z"
 		},
 		{
-			"checksumSHA1": "8AFcgl/ENSDLQ26Mglf3RXTi2DQ=",
+			"checksumSHA1": "e9ZQz6FpXi0QrNny0gSeJhi239Y=",
 			"path": "gitlab.com/gitlab-org/gitaly-proto/go",
-			"revision": "a90904cbcc0b21b0aabdfc80c38e30b598309c34",
-			"revisionTime": "2017-08-01T15:18:55Z",
-			"version": "v0.24.0",
-			"versionExact": "v0.24.0"
+			"revision": "8467d23c4e791b2b4f6672e152efb9a07c7b3310",
+			"revisionTime": "2017-08-03T18:19:00Z",
+			"version": "v0.25.0",
+			"versionExact": "v0.25.0"
 		},
 		{
 			"checksumSHA1": "Y+HGqEkYM15ir+J93MEaHdyFy0c=",