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package git
import (
"fmt"
"path/filepath"
"sync"
"testing"
"time"
"github.com/go-git/go-billy/v5/util"
"github.com/stretchr/testify/require"
"github.com/go-git/go-git/v5/plumbing/object"
)
// setupBenchmarkRepo creates a test repository with the specified number of files.
// It returns the worktree for benchmarking.
func setupBenchmarkRepo(b *testing.B, numFiles, numSubdirs, numGoroutines int) *Worktree {
b.Helper()
tmpDir := b.TempDir()
repoDir := filepath.Join(tmpDir, "repo")
repo, err := PlainInit(repoDir, false)
require.NoError(b, err)
wt, err := repo.Worktree()
require.NoError(b, err)
content := []byte("test content for benchmark\n")
var wg sync.WaitGroup
fileChan := make(chan string, numFiles)
for range numGoroutines {
wg.Add(1)
go func() {
defer wg.Done()
for filePath := range fileChan {
dir := filepath.Dir(filePath)
err := wt.Filesystem.MkdirAll(dir, 0o755)
if err != nil {
b.Errorf("failed to create directory %s: %v", dir, err)
continue
}
err = util.WriteFile(wt.Filesystem, filePath, content, 0o644)
if err != nil {
b.Errorf("failed to write file %s: %v", filePath, err)
}
}
}()
}
for i := range numFiles {
subdir := fmt.Sprintf("dir%d", i%numSubdirs)
fileName := fmt.Sprintf("file%04d.txt", i)
filePath := filepath.Join(subdir, fileName)
fileChan <- filePath
}
close(fileChan)
wg.Wait()
for i := range numSubdirs {
err = wt.AddGlob(fmt.Sprintf("dir%d/*", i))
require.NoError(b, err)
}
sig := &object.Signature{
Name: "Benchmark",
Email: "benchmark@test.com",
When: time.Now(),
}
_, err = wt.Commit("Initial commit with many files", &CommitOptions{
Author: sig,
Committer: sig,
})
require.NoError(b, err)
return wt
}
// BenchmarkStatus benchmarks Status() on a repository with 2000 files.
// It includes sub-benchmarks for clean and modified scenarios.
func BenchmarkStatus(b *testing.B) {
const (
numFiles = 2000
numSubdirs = 10
numGoroutines = 10
)
wt := setupBenchmarkRepo(b, numFiles, numSubdirs, numGoroutines)
b.Run("Clean", benchmarkStatusClean(wt))
b.Run("Modified", benchmarkStatusModified(wt, numFiles, numSubdirs))
}
// benchmarkStatusClean returns a benchmark function for testing Status() on a clean repository.
// This represents the worst-case scenario for the current implementation where
// every file's hash is computed unnecessarily since nothing has changed.
func benchmarkStatusClean(wt *Worktree) func(b *testing.B) {
return func(b *testing.B) {
for b.Loop() {
status, err := wt.Status()
if err != nil {
b.Fatalf("failed to get status: %v", err)
}
if !status.IsClean() {
b.Fatalf("expected clean status, got: %v", status)
}
}
}
}
// benchmarkStatusModified returns a benchmark function for testing Status() on a repository
// with some modified files. This represents a more realistic scenario where a small
// percentage of files have changed.
func benchmarkStatusModified(wt *Worktree, numFiles, numSubdirs int) func(b *testing.B) {
return func(b *testing.B) {
const modifiedPercent = 1
numModified := (numFiles * modifiedPercent) / 100
if numModified == 0 {
numModified = 1
}
modifiedContent := []byte("modified content\n")
for i := range numModified {
subdir := fmt.Sprintf("dir%d", i%numSubdirs)
fileName := fmt.Sprintf("file%04d.txt", i)
filePath := filepath.Join(subdir, fileName)
err := util.WriteFile(wt.Filesystem, filePath, modifiedContent, 0o644)
require.NoError(b, err)
}
for b.Loop() {
status, err := wt.Status()
if err != nil {
b.Fatalf("failed to get status: %v", err)
}
if status.IsClean() {
b.Fatalf("expected modified status, got clean")
}
modCount := 0
for _, fileStatus := range status {
if fileStatus.Worktree == Modified {
modCount++
}
}
if modCount != numModified {
b.Fatalf("expected %d modified files, got %d", numModified, modCount)
}
}
}
}
// BenchmarkStatusLarge benchmarks Status() on a large repository with 5000 files.
func BenchmarkStatusLarge(b *testing.B) {
const (
numFiles = 5000
numSubdirs = 20
numGoroutines = 10
)
wt := setupBenchmarkRepo(b, numFiles, numSubdirs, numGoroutines)
b.Run("Clean", benchmarkStatusClean(wt))
}
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