File count and bytes in CommitLanguage response

This change extends the CommitLanguage response to include FileCount and
Bytes. Getting the FileCount per language requires an additional
git-linguist call which might increase the GRPC call execution time.
To have control over the FileCount call, a new feature flag
('linguist_file_count_stats') has been introduced that can be turned off
when performance issues occur.

8 files changed, 286 insertions, 152 deletions

diff --git a/changelogs/unreleased/include-file-count-in-commit-language-reponse.yml b/changelogs/unreleased/include-file-count-in-commit-language-reponse.yml
new file mode 100644
index 000000000..34db2110b
--- /dev/null
+++ b/changelogs/unreleased/include-file-count-in-commit-language-reponse.yml
@@ -0,0 +1,5 @@
+---
+title: Include file count and bytes in CommitLanguage response
+merge_request: 1482
+author:
+type: changed
diff --git a/internal/linguist/linguist.go b/internal/linguist/linguist.go
index 3b215fd9a..419f22993 100644
--- a/internal/linguist/linguist.go
+++ b/internal/linguist/linguist.go
@@ -19,6 +19,8 @@ func init() {
 	config.RegisterHook(LoadColors)
 }
 
+var exportedEnvVars = []string{"HOME", "PATH", "GEM_HOME", "BUNDLE_PATH", "BUNDLE_APP_CONFIG"}
+
 var (
 	colorMap = make(map[string]Language)
 )
@@ -28,11 +30,19 @@ type Language struct {
 	Color string `json:"color"`
 }
 
+// CountPerLanguage represents a counter value (int) per language.
+type CountPerLanguage map[string]int
+
+// ByteCountPerLanguage represents a counter value (bytes) per language.
+type ByteCountPerLanguage map[string]uint64
+
+// FileListPerLanguage is used to parse Linguist's breakdown output to represent the list of files per language.
+type FileListPerLanguage map[string][]string
+
 // Stats returns the repository's language stats as reported by 'git-linguist'.
-func Stats(ctx context.Context, repoPath string, commitID string) (map[string]int, error) {
-	cmd := exec.Command("bundle", "exec", "bin/ruby-cd", repoPath, "git-linguist", "--commit="+commitID, "stats")
-	cmd.Dir = config.Config.Ruby.Dir
-	reader, err := command.New(ctx, cmd, nil, nil, nil, os.Environ()...)
+func Stats(ctx context.Context, repoPath string, commitID string) (ByteCountPerLanguage, error) {
+	reader, err := startGitLinguist(ctx, repoPath, commitID, "stats")
+
 	if err != nil {
 		return nil, err
 	}
@@ -42,10 +52,35 @@ func Stats(ctx context.Context, repoPath string, commitID string) (map[string]in
 		return nil, err
 	}
 
-	stats := make(map[string]int)
+	stats := make(ByteCountPerLanguage)
 	return stats, json.Unmarshal(data, &stats)
 }
 
+// FileCountStats returns the file counts per language
+func FileCountStats(ctx context.Context, repoPath string, commitID string) (CountPerLanguage, error) {
+	reader, err := startGitLinguist(ctx, repoPath, commitID, "breakdown")
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	languageFiles := make(FileListPerLanguage)
+	if err := json.Unmarshal(data, &languageFiles); err != nil {
+		return nil, err
+	}
+
+	stats := make(CountPerLanguage)
+	for lang, files := range languageFiles {
+		stats[lang] = len(files)
+	}
+
+	return stats, nil
+}
+
 // Color returns the color Linguist has assigned to language.
 func Color(language string) string {
 	if color := colorMap[language].Color; color != "" {
@@ -67,6 +102,19 @@ func LoadColors(cfg config.Cfg) error {
 	return json.NewDecoder(jsonReader).Decode(&colorMap)
 }
 
+func startGitLinguist(ctx context.Context, repoPath string, commitID string, linguistCommand string) (io.Reader, error) {
+	cmd := exec.Command("bundle", "exec", "bin/ruby-cd", repoPath, "git-linguist", "--commit="+commitID, linguistCommand)
+	cmd.Dir = config.Config.Ruby.Dir
+
+	var env []string
+	reader, err := command.New(ctx, cmd, nil, nil, nil, exportEnvironment(env)...)
+	if err != nil {
+		return nil, err
+	}
+
+	return reader, nil
+}
+
 func openLanguagesJSON(cfg config.Cfg) (io.ReadCloser, error) {
 	if jsonPath := cfg.Ruby.LinguistLanguagesPath; jsonPath != "" {
 		// This is a fallback for environments where dynamic discovery of the
@@ -106,3 +154,13 @@ func openLanguagesJSON(cfg config.Cfg) (io.ReadCloser, error) {
 
 	return os.Open(path.Join(linguistPathSymlink.Name(), "lib/linguist/languages.json"))
 }
+
+func exportEnvironment(env []string) []string {
+	for _, envVarName := range exportedEnvVars {
+		if val, ok := os.LookupEnv(envVarName); ok {
+			env = append(env, fmt.Sprintf("%s=%s", envVarName, val))
+		}
+	}
+
+	return env
+}
diff --git a/internal/metadata/featureflag/featureflags.go b/internal/metadata/featureflag/featureflags.go
index 8ddd15d26..9860291b9 100644
--- a/internal/metadata/featureflag/featureflags.go
+++ b/internal/metadata/featureflag/featureflags.go
@@ -3,4 +3,7 @@ package featureflag
 const (
 	// GetAllLFSPointersGo will cause the GetAllLFSPointers RPC to use the go implementation when set
 	GetAllLFSPointersGo = "get_all_lfs_pointers_go"
+
+	// LinguistFileCountStats will invoke an additional git-linguist command to get the number of files per language
+	LinguistFileCountStats = "linguist_file_count_stats"
 )
diff --git a/internal/service/commit/languages.go b/internal/service/commit/languages.go
index 87c8ab0d5..17a00407e 100644
--- a/internal/service/commit/languages.go
+++ b/internal/service/commit/languages.go
@@ -9,6 +9,7 @@ import (
 	"gitlab.com/gitlab-org/gitaly/internal/helper"
 	"gitlab.com/gitlab-org/gitaly/internal/helper/text"
 	"gitlab.com/gitlab-org/gitaly/internal/linguist"
+	"gitlab.com/gitlab-org/gitaly/internal/metadata/featureflag"
 	"gitlab.com/gitlab-org/gitaly/internal/service/ref"
 	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
 	"google.golang.org/grpc/codes"
@@ -45,12 +46,21 @@ func (*server) CommitLanguages(ctx context.Context, req *gitalypb.CommitLanguage
 		return nil, err
 	}
 
+	// TODO: remove feature flag when Stats and FileCountStats is executed with one ruby script call
+	fileCountStats := make(linguist.CountPerLanguage)
+	if featureflag.IsEnabled(ctx, featureflag.LinguistFileCountStats) {
+		fileCountStats, err = linguist.FileCountStats(ctx, repoPath, commitID)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	resp := &gitalypb.CommitLanguagesResponse{}
 	if len(stats) == 0 {
 		return resp, nil
 	}
 
-	total := 0
+	total := uint64(0)
 	for _, count := range stats {
 		total += count
 	}
@@ -61,9 +71,11 @@ func (*server) CommitLanguages(ctx context.Context, req *gitalypb.CommitLanguage
 
 	for lang, count := range stats {
 		l := &gitalypb.CommitLanguagesResponse_Language{
-			Name:  lang,
-			Share: float32(100*count) / float32(total),
-			Color: linguist.Color(lang),
+			Name:      lang,
+			Share:     float32(100*count) / float32(total),
+			Color:     linguist.Color(lang),
+			FileCount: uint32(fileCountStats[lang]),
+			Bytes:     uint64(stats[lang]),
 		}
 		resp.Languages = append(resp.Languages, l)
 	}
diff --git a/internal/service/commit/languages_test.go b/internal/service/commit/languages_test.go
index c23ba8a23..b456719a5 100644
--- a/internal/service/commit/languages_test.go
+++ b/internal/service/commit/languages_test.go
@@ -5,9 +5,11 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"gitlab.com/gitlab-org/gitaly/internal/metadata/featureflag"
 	"gitlab.com/gitlab-org/gitaly/internal/testhelper"
 	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
 	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
 )
 
 func TestLanguages(t *testing.T) {
@@ -27,40 +29,67 @@ func TestLanguages(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
+
+	ctx = EnableLinguistFileCountStatsFeatureFlag(ctx)
+
 	resp, err := client.CommitLanguages(ctx, request)
 	require.NoError(t, err)
 
 	require.NotZero(t, len(resp.Languages), "number of languages in response")
 
 	expectedLanguages := []gitalypb.CommitLanguagesResponse_Language{
-		{Name: "Ruby", Share: 66, Color: "#701516"},
-		{Name: "JavaScript", Share: 22, Color: "#f1e05a"},
-		{Name: "HTML", Share: 7, Color: "#e34c26"},
-		{Name: "CoffeeScript", Share: 2, Color: "#244776"},
+		{Name: "Ruby", Share: 66, Color: "#701516", FileCount: 4, Bytes: 2943},
+		{Name: "JavaScript", Share: 22, Color: "#f1e05a", FileCount: 1, Bytes: 1014},
+		{Name: "HTML", Share: 7, Color: "#e34c26", FileCount: 1, Bytes: 349},
+		{Name: "CoffeeScript", Share: 2, Color: "#244776", FileCount: 1, Bytes: 107},
 		// Modula-2 is a special case because Linguist has no color for it. This
 		// test case asserts that we invent a color for it (SHA256 of the name).
-		{Name: "Modula-2", Share: 2, Color: "#3fd5e0"},
+		{Name: "Modula-2", Share: 2, Color: "#3fd5e0", FileCount: 1, Bytes: 95},
 	}
 
 	require.Equal(t, len(expectedLanguages), len(resp.Languages))
 
 	for i, el := range expectedLanguages {
 		actualLanguage := resp.Languages[i]
-		require.True(t, languageEqual(&el, actualLanguage), "expected %+v, got %+v", el, *actualLanguage)
+		requireLanguageEqual(t, &el, actualLanguage)
 	}
 }
 
-func languageEqual(expected, actual *gitalypb.CommitLanguagesResponse_Language) bool {
-	if expected.Name != actual.Name {
-		return false
-	}
-	if expected.Color != actual.Color {
-		return false
+func TestFileCountIsZeroWhenFeatureIsDisabled(t *testing.T) {
+	server, serverSocketPath := startTestServices(t)
+	defer server.Stop()
+
+	client, conn := newCommitServiceClient(t, serverSocketPath)
+	defer conn.Close()
+
+	testRepo, _, cleanupFn := testhelper.NewTestRepo(t)
+	defer cleanupFn()
+
+	request := &gitalypb.CommitLanguagesRequest{
+		Repository: testRepo,
+		Revision:   []byte("cb19058ecc02d01f8e4290b7e79cafd16a8839b6"),
 	}
-	if (expected.Share-actual.Share)*(expected.Share-actual.Share) >= 1.0 {
-		return false
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	resp, err := client.CommitLanguages(ctx, request)
+	require.NoError(t, err)
+
+	require.NotZero(t, len(resp.Languages), "number of languages in response")
+
+	for i := range resp.Languages {
+		actualLanguage := resp.Languages[i]
+		require.Equal(t, uint32(0), actualLanguage.FileCount)
 	}
-	return true
+}
+
+func requireLanguageEqual(t *testing.T, expected, actual *gitalypb.CommitLanguagesResponse_Language) {
+	require.Equal(t, expected.Name, actual.Name)
+	require.Equal(t, expected.Color, actual.Color)
+	require.False(t, (expected.Share-actual.Share)*(expected.Share-actual.Share) >= 1.0, "shares do not match")
+	require.Equal(t, expected.FileCount, actual.FileCount)
+	require.Equal(t, expected.Bytes, actual.Bytes)
 }
 
 func TestLanguagesEmptyRevision(t *testing.T) {
@@ -112,3 +141,9 @@ func TestInvalidCommitLanguagesRequestRevision(t *testing.T) {
 	})
 	testhelper.RequireGrpcError(t, err, codes.InvalidArgument)
 }
+
+func EnableLinguistFileCountStatsFeatureFlag(ctx context.Context) context.Context {
+	return metadata.NewOutgoingContext(ctx, metadata.New(map[string]string{
+		featureflag.HeaderKey(featureflag.LinguistFileCountStats): "true",
+	}))
+}
diff --git a/proto/commit.proto b/proto/commit.proto
index 35ce65c43..8eca1dd75 100644
--- a/proto/commit.proto
+++ b/proto/commit.proto
@@ -360,6 +360,8 @@ message CommitLanguagesResponse {
     string name = 1;
     float share = 2;
     string color = 3;
+    uint32 file_count = 4;
+    uint64 bytes = 5;
   }
   repeated Language languages = 1;
 }
diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index aabc2b7f3..c83afcbf6 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -1701,6 +1701,8 @@ type CommitLanguagesResponse_Language struct {
 	Name                 string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
 	Share                float32  `protobuf:"fixed32,2,opt,name=share,proto3" json:"share,omitempty"`
 	Color                string   `protobuf:"bytes,3,opt,name=color,proto3" json:"color,omitempty"`
+	FileCount            uint32   `protobuf:"varint,4,opt,name=file_count,json=fileCount,proto3" json:"file_count,omitempty"`
+	Bytes                uint64   `protobuf:"varint,5,opt,name=bytes,proto3" json:"bytes,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -1752,6 +1754,20 @@ func (m *CommitLanguagesResponse_Language) GetColor() string {
 	return ""
 }
 
+func (m *CommitLanguagesResponse_Language) GetFileCount() uint32 {
+	if m != nil {
+		return m.FileCount
+	}
+	return 0
+}
+
+func (m *CommitLanguagesResponse_Language) GetBytes() uint64 {
+	if m != nil {
+		return m.Bytes
+	}
+	return 0
+}
+
 type RawBlameRequest struct {
 	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	Revision             []byte      `protobuf:"bytes,2,opt,name=revision,proto3" json:"revision,omitempty"`
@@ -2659,134 +2675,135 @@ func init() {
 func init() { proto.RegisterFile("commit.proto", fileDescriptor_db7163399a465f48) }
 
 var fileDescriptor_db7163399a465f48 = []byte{
-	// 2017 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/ruby/proto/gitaly/commit_pb.rb b/ruby/proto/gitaly/commit_pb.rb
index 6cb34706f..31d68226b 100644
--- a/ruby/proto/gitaly/commit_pb.rb
+++ b/ruby/proto/gitaly/commit_pb.rb
@@ -167,6 +167,8 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
     optional :name, :string, 1
     optional :share, :float, 2
     optional :color, :string, 3
+    optional :file_count, :uint32, 4
+    optional :bytes, :uint64, 5
   end
   add_message "gitaly.RawBlameRequest" do
     optional :repository, :message, 1, "gitaly.Repository"