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Use cat-file --batch in GetLanguageStats (#14685)

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* Use cat-file --batch in GetLanguageStats

This PR moves to using a single cat-file --batch in GetLanguageStats
significantly reducing the number of processes spawned during language stat
processing.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update modules/git/repo_language_stats_nogogit.go

Co-authored-by: a1012112796 <1012112796@qq.com>

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
zeripath 2021-02-17 19:32:47 +00:00 committed by GitHub
parent fe628d8406
commit 7ba158183a
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 100 additions and 30 deletions
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130
modules/git/repo_language_stats_nogogit.go
View file

@ -7,9 +7,11 @@
package git
import (
"bufio"
"bytes"
"io"
"io/ioutil"
"math"
"strings"
"code.gitea.io/gitea/modules/analyze"
@ -18,16 +20,60 @@ import (
// GetLanguageStats calculates language stats for git repository at specified commit
func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, error) {
// FIXME: We can be more efficient here...
//
// We're expecting that we will be reading a lot of blobs and the trees
// Thus we should use a shared `cat-file --batch` to get all of this data
// And keep the buffers around with resets as necessary.
//
// It's more complicated so...
commit, err := repo.GetCommit(commitID)
// We will feed the commit IDs in order into cat-file --batch, followed by blobs as necessary.
// so let's create a batch stdin and stdout
batchStdinReader, batchStdinWriter := io.Pipe()
batchStdoutReader, batchStdoutWriter := io.Pipe()
defer func() {
_ = batchStdinReader.Close()
_ = batchStdinWriter.Close()
_ = batchStdoutReader.Close()
_ = batchStdoutWriter.Close()
}()
go func() {
stderr := strings.Builder{}
err := NewCommand("cat-file", "--batch").RunInDirFullPipeline(repo.Path, batchStdoutWriter, &stderr, batchStdinReader)
if err != nil {
_ = batchStdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
_ = batchStdinReader.CloseWithError(ConcatenateError(err, (&stderr).String()))
} else {
_ = batchStdoutWriter.Close()
_ = batchStdinReader.Close()
}
}()
// For simplicities sake we'll us a buffered reader
batchReader := bufio.NewReader(batchStdoutReader)
writeID := func(id string) error {
_, err := batchStdinWriter.Write([]byte(id))
if err != nil {
return err
}
_, err = batchStdinWriter.Write([]byte{'\n'})
return err
}
if err := writeID(commitID); err != nil {
return nil, err
}
shaBytes, typ, size, err := ReadBatchLine(batchReader)
if typ != "commit" {
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, ErrNotExist{commitID, ""}
}
sha, err := NewIDFromString(string(shaBytes))
if err != nil {
log("Unable to get commit for: %s", commitID)
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, ErrNotExist{commitID, ""}
}
commit, err := CommitFromReader(repo, sha, io.LimitReader(batchReader, size))
if err != nil {
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, err
}
@ -38,17 +84,45 @@ func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, err
return nil, err
}
contentBuf := bytes.Buffer{}
var content []byte
sizes := make(map[string]int64)
for _, f := range entries {
contentBuf.Reset()
content = contentBuf.Bytes()
if f.Size() == 0 || enry.IsVendor(f.Name()) || enry.IsDotFile(f.Name()) ||
enry.IsDocumentation(f.Name()) || enry.IsConfiguration(f.Name()) {
continue
}
// If content can not be read or file is too big just do detection by filename
var content []byte
if f.Size() <= bigFileSize {
content, _ = readFile(f, fileSizeLimit)
if err := writeID(f.ID.String()); err != nil {
return nil, err
}
_, _, size, err := ReadBatchLine(batchReader)
if err != nil {
log("Error reading blob: %s Err: %v", f.ID.String(), err)
return nil, err
}
sizeToRead := size
discard := int64(0)
if size > fileSizeLimit {
sizeToRead = fileSizeLimit
discard = size - fileSizeLimit
}
_, err = contentBuf.ReadFrom(io.LimitReader(batchReader, sizeToRead))
if err != nil {
return nil, err
}
content = contentBuf.Bytes()
err = discardFull(batchReader, discard)
if err != nil {
return nil, err
}
}
if enry.IsGenerated(f.Name(), content) {
continue
@ -86,24 +160,20 @@ func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, err
return sizes, nil
}
func readFile(entry *TreeEntry, limit int64) ([]byte, error) {
// FIXME: We can probably be a little more efficient here... see above
r, err := entry.Blob().DataAsync()
if err != nil {
return nil, err
func discardFull(rd *bufio.Reader, discard int64) error {
if discard > math.MaxInt32 {
n, err := rd.Discard(math.MaxInt32)
discard -= int64(n)
if err != nil {
return err
}
}
defer r.Close()
if limit <= 0 {
return ioutil.ReadAll(r)
for discard > 0 {
n, err := rd.Discard(int(discard))
discard -= int64(n)
if err != nil {
return err
}
}
size := entry.Size()
if limit > 0 && size > limit {
size = limit
}
buf := bytes.NewBuffer(nil)
buf.Grow(int(size))
_, err = io.Copy(buf, io.LimitReader(r, limit))
return buf.Bytes(), err
return nil
}