Move Bleve and Elastic code indexers to use a common cat-file --batch (#14781)

* Extract out the common cat-file batch calls

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

* Move bleve and elastic indexers to use a common cat-file --batch when indexing

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

* move catfilebatch to batch_reader and rename to batch_reader.go

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

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>

modules/git/batch_reader.go

@@ -2,17 +2,48 @@
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
 
-// +build !gogit
-
 package git
 
 import (
 	"bufio"
 	"bytes"
+	"io"
 	"math"
 	"strconv"
+	"strings"
 )
 
+// CatFileBatch opens git cat-file --batch in the provided repo and returns a stdin pipe, a stdout reader and cancel function
+func CatFileBatch(repoPath string) (*io.PipeWriter, *bufio.Reader, func()) {
+	// Next feed the commits in order into cat-file --batch, followed by their trees and sub trees as necessary.
+	// so let's create a batch stdin and stdout
+	batchStdinReader, batchStdinWriter := io.Pipe()
+	batchStdoutReader, batchStdoutWriter := io.Pipe()
+	cancel := func() {
+		_ = batchStdinReader.Close()
+		_ = batchStdinWriter.Close()
+		_ = batchStdoutReader.Close()
+		_ = batchStdoutWriter.Close()
+	}
+
+	go func() {
+		stderr := strings.Builder{}
+		err := NewCommand("cat-file", "--batch").RunInDirFullPipeline(repoPath, 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 to read from the cat-file --batch
+	batchReader := bufio.NewReader(batchStdoutReader)
+
+	return batchStdinWriter, batchReader, cancel
+}
+
 // ReadBatchLine reads the header line from cat-file --batch
 // We expect:
 // <sha> SP <type> SP <size> LF

modules/git/commit_info_nogogit.go

@@ -141,29 +141,8 @@ func GetLastCommitForPaths(commit *Commit, treePath string, paths []string) ([]*
 		}
 	}()
 
-	// We feed the commits in order into cat-file --batch, followed by their trees and sub trees 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(commit.repo.Path, batchStdoutWriter, &stderr, batchStdinReader)
-		if err != nil {
-			_ = revListWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
-		} else {
-			_ = revListWriter.Close()
-		}
-	}()
-
-	// For simplicities sake we'll us a buffered reader
-	batchReader := bufio.NewReader(batchStdoutReader)
+	batchStdinWriter, batchReader, cancel := CatFileBatch(commit.repo.Path)
+	defer cancel()
 
 	mapsize := 4096
 	if len(paths) > mapsize {

modules/git/pipeline/lfs_nogogit.go

@@ -64,27 +64,8 @@ func FindLFSFile(repo *git.Repository, hash git.SHA1) ([]*LFSResult, error) {
 
 	// Next feed the commits in order into cat-file --batch, followed by their trees and sub trees 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 := git.NewCommand("cat-file", "--batch").RunInDirFullPipeline(repo.Path, batchStdoutWriter, &stderr, batchStdinReader)
-		if err != nil {
-			_ = revListWriter.CloseWithError(git.ConcatenateError(err, (&stderr).String()))
-		} else {
-			_ = revListWriter.Close()
-		}
-	}()
-
-	// For simplicities sake we'll us a buffered reader to read from the cat-file --batch
-	batchReader := bufio.NewReader(batchStdoutReader)
+	batchStdinWriter, batchReader, cancel := git.CatFileBatch(repo.Path)
+	defer cancel()
 
 	// We'll use a scanner for the revList because it's simpler than a bufio.Reader
 	scan := bufio.NewScanner(revListReader)

modules/git/repo_language_stats_nogogit.go

@@ -11,7 +11,6 @@ import (
 	"bytes"
 	"io"
 	"math"
-	"strings"
 
 	"code.gitea.io/gitea/modules/analyze"
 
@@ -22,30 +21,8 @@ import (
 func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, error) {
 	// 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)
+	batchStdinWriter, batchReader, cancel := CatFileBatch(repo.Path)
+	defer cancel()
 
 	writeID := func(id string) error {
 		_, err := batchStdinWriter.Write([]byte(id))

modules/indexer/code/bleve.go

@@ -5,7 +5,10 @@
 package code
 
 import (
+	"bufio"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -173,7 +176,7 @@ func NewBleveIndexer(indexDir string) (*BleveIndexer, bool, error) {
 	return indexer, created, err
 }
 
-func (b *BleveIndexer) addUpdate(commitSha string, update fileUpdate, repo *models.Repository, batch rupture.FlushingBatch) error {
+func (b *BleveIndexer) addUpdate(batchWriter *io.PipeWriter, batchReader *bufio.Reader, commitSha string, update fileUpdate, repo *models.Repository, batch rupture.FlushingBatch) error {
 	// Ignore vendored files in code search
 	if setting.Indexer.ExcludeVendored && enry.IsVendor(update.Filename) {
 		return nil
@@ -196,8 +199,16 @@ func (b *BleveIndexer) addUpdate(commitSha string, update fileUpdate, repo *mode
 		return b.addDelete(update.Filename, repo, batch)
 	}
 
-	fileContents, err := git.NewCommand("cat-file", "blob", update.BlobSha).
-		RunInDirBytes(repo.RepoPath())
+	if _, err := batchWriter.Write([]byte(update.BlobSha + "\n")); err != nil {
+		return err
+	}
+
+	_, _, size, err := git.ReadBatchLine(batchReader)
+	if err != nil {
+		return err
+	}
+
+	fileContents, err := ioutil.ReadAll(io.LimitReader(batchReader, size))
 	if err != nil {
 		return err
 	} else if !base.IsTextFile(fileContents) {
@@ -254,10 +265,17 @@ func (b *BleveIndexer) Close() {
 // Index indexes the data
 func (b *BleveIndexer) Index(repo *models.Repository, sha string, changes *repoChanges) error {
 	batch := rupture.NewFlushingBatch(b.indexer, maxBatchSize)
-	for _, update := range changes.Updates {
-		if err := b.addUpdate(sha, update, repo, batch); err != nil {
-			return err
+	if len(changes.Updates) > 0 {
+
+		batchWriter, batchReader, cancel := git.CatFileBatch(repo.RepoPath())
+		defer cancel()
+
+		for _, update := range changes.Updates {
+			if err := b.addUpdate(batchWriter, batchReader, sha, update, repo, batch); err != nil {
+				return err
+			}
 		}
+		cancel()
 	}
 	for _, filename := range changes.RemovedFilenames {
 		if err := b.addDelete(filename, repo, batch); err != nil {

modules/indexer/code/elastic_search.go

@@ -5,8 +5,11 @@
 package code
 
 import (
+	"bufio"
 	"context"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"strconv"
 	"strings"
 	"time"
@@ -172,7 +175,7 @@ func (b *ElasticSearchIndexer) init() (bool, error) {
 	return exists, nil
 }
 
-func (b *ElasticSearchIndexer) addUpdate(sha string, update fileUpdate, repo *models.Repository) ([]elastic.BulkableRequest, error) {
+func (b *ElasticSearchIndexer) addUpdate(batchWriter *io.PipeWriter, batchReader *bufio.Reader, sha string, update fileUpdate, repo *models.Repository) ([]elastic.BulkableRequest, error) {
 	// Ignore vendored files in code search
 	if setting.Indexer.ExcludeVendored && enry.IsVendor(update.Filename) {
 		return nil, nil
@@ -195,8 +198,16 @@ func (b *ElasticSearchIndexer) addUpdate(sha string, update fileUpdate, repo *mo
 		return []elastic.BulkableRequest{b.addDelete(update.Filename, repo)}, nil
 	}
 
-	fileContents, err := git.NewCommand("cat-file", "blob", update.BlobSha).
-		RunInDirBytes(repo.RepoPath())
+	if _, err := batchWriter.Write([]byte(update.BlobSha + "\n")); err != nil {
+		return nil, err
+	}
+
+	_, _, size, err := git.ReadBatchLine(batchReader)
+	if err != nil {
+		return nil, err
+	}
+
+	fileContents, err := ioutil.ReadAll(io.LimitReader(batchReader, size))
 	if err != nil {
 		return nil, err
 	} else if !base.IsTextFile(fileContents) {
@@ -230,14 +241,21 @@ func (b *ElasticSearchIndexer) addDelete(filename string, repo *models.Repositor
 // Index will save the index data
 func (b *ElasticSearchIndexer) Index(repo *models.Repository, sha string, changes *repoChanges) error {
 	reqs := make([]elastic.BulkableRequest, 0)
-	for _, update := range changes.Updates {
-		updateReqs, err := b.addUpdate(sha, update, repo)
-		if err != nil {
-			return err
-		}
-		if len(updateReqs) > 0 {
-			reqs = append(reqs, updateReqs...)
+	if len(changes.Updates) > 0 {
+
+		batchWriter, batchReader, cancel := git.CatFileBatch(repo.RepoPath())
+		defer cancel()
+
+		for _, update := range changes.Updates {
+			updateReqs, err := b.addUpdate(batchWriter, batchReader, sha, update, repo)
+			if err != nil {
+				return err
+			}
+			if len(updateReqs) > 0 {
+				reqs = append(reqs, updateReqs...)
+			}
 		}
+		cancel()
 	}
 
 	for _, filename := range changes.RemovedFilenames {