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Go
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import ( "bufio" "context" "crypto/sha256" "fmt" "io" "os/exec" "path" "strings" "time"
"github.com/dgraph-io/ristretto" "github.com/go-git/go-git/v5/plumbing" "github.com/go-git/go-git/v5/plumbing/object")
var ( commitCache *ristretto.Cache)
func init() { cache, _ := ristretto.NewCache(&ristretto.Config{ NumCounters: 1e7, MaxCost: 1 << 30, BufferItems: 64, TtlTickerDurationInSec: 120, }) commitCache = cache}
func (g *GitRepo) streamingGitLog(ctx context.Context, extraArgs ...string) (io.Reader, error) { args := []string{} args = append(args, "log") args = append(args, g.h.String()) args = append(args, extraArgs...)
cmd := exec.CommandContext(ctx, "git", args...) cmd.Dir = g.path
stdout, err := cmd.StdoutPipe() if err != nil { return nil, err }
if err := cmd.Start(); err != nil { return nil, err }
return stdout, nil}
type commit struct { hash plumbing.Hash when time.Time files []string message string}
func cacheKey(g *GitRepo, path string) string { sep := byte(':') hash := sha256.Sum256(fmt.Append([]byte{}, g.path, sep, g.h.String(), sep, path)) return fmt.Sprintf("%x", hash)}
func (g *GitRepo) calculateCommitTimeIn(ctx context.Context, subtree *object.Tree, parent string, timeout time.Duration) (map[string]commit, error) { ctx, cancel := context.WithTimeout(ctx, timeout) defer cancel() return g.calculateCommitTime(ctx, subtree, parent)}
func (g *GitRepo) calculateCommitTime(ctx context.Context, subtree *object.Tree, parent string) (map[string]commit, error) { filesToDo := make(map[string]struct{}) filesDone := make(map[string]commit) for _, e := range subtree.Entries { fpath := path.Clean(path.Join(parent, e.Name)) filesToDo[fpath] = struct{}{} }
for _, e := range subtree.Entries { f := path.Clean(path.Join(parent, e.Name)) cacheKey := cacheKey(g, f) if cached, ok := commitCache.Get(cacheKey); ok { filesDone[f] = cached.(commit) delete(filesToDo, f) } else { filesToDo[f] = struct{}{} } }
if len(filesToDo) == 0 { return filesDone, nil }
ctx, cancel := context.WithCancel(ctx) defer cancel()
pathSpec := "." if parent != "" { pathSpec = parent } output, err := g.streamingGitLog(ctx, "--pretty=format:%H,%ad,%s", "--date=iso", "--name-only", "--", pathSpec) if err != nil { return nil, err }
reader := bufio.NewReader(output) var current commit for { line, err := reader.ReadString('\n') if err != nil && err != io.EOF { return nil, err } line = strings.TrimSpace(line)
if line == "" { if !current.hash.IsZero() { // we have a fully parsed commit for _, f := range current.files { if _, ok := filesToDo[f]; ok { filesDone[f] = current delete(filesToDo, f) commitCache.Set(cacheKey(g, f), current, 0) } }
if len(filesToDo) == 0 { cancel() break } current = commit{} } } else if current.hash.IsZero() { parts := strings.SplitN(line, ",", 3) if len(parts) == 3 { current.hash = plumbing.NewHash(parts[0]) current.when, _ = time.Parse("2006-01-02 15:04:05 -0700", parts[1]) current.message = parts[2] } } else { // all ancestors along this path should also be included file := path.Clean(line) ancestors := ancestors(file) current.files = append(current.files, file) current.files = append(current.files, ancestors...) }
if err == io.EOF { break } }
return filesDone, nil}
func ancestors(p string) []string { var ancestors []string
for { p = path.Dir(p) if p == "." || p == "/" { break } ancestors = append(ancestors, p) } return ancestors}