Code/repo search (#2582)

Indexed search of repository contents (for default branch only)

1 files changed, 199 insertions, 0 deletions

diff --git a/modules/indexer/repo.go b/modules/indexer/repo.go
new file mode 100644
index 0000000000..226e565e3e
--- /dev/null
+++ b/modules/indexer/repo.go
@@ -0,0 +1,199 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package indexer
+
+import (
+	"os"
+	"strings"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/blevesearch/bleve"
+	"github.com/blevesearch/bleve/analysis/analyzer/custom"
+	"github.com/blevesearch/bleve/analysis/token/camelcase"
+	"github.com/blevesearch/bleve/analysis/token/lowercase"
+	"github.com/blevesearch/bleve/analysis/tokenizer/unicode"
+)
+
+const repoIndexerAnalyzer = "repoIndexerAnalyzer"
+
+// repoIndexer (thread-safe) index for repository contents
+var repoIndexer bleve.Index
+
+// RepoIndexerOp type of operation to perform on repo indexer
+type RepoIndexerOp int
+
+const (
+	// RepoIndexerOpUpdate add/update a file's contents
+	RepoIndexerOpUpdate = iota
+
+	// RepoIndexerOpDelete delete a file
+	RepoIndexerOpDelete
+)
+
+// RepoIndexerData data stored in the repo indexer
+type RepoIndexerData struct {
+	RepoID  int64
+	Content string
+}
+
+// RepoIndexerUpdate an update to the repo indexer
+type RepoIndexerUpdate struct {
+	Filepath string
+	Op       RepoIndexerOp
+	Data     *RepoIndexerData
+}
+
+func (update RepoIndexerUpdate) addToBatch(batch *bleve.Batch) error {
+	id := filenameIndexerID(update.Data.RepoID, update.Filepath)
+	switch update.Op {
+	case RepoIndexerOpUpdate:
+		return batch.Index(id, update.Data)
+	case RepoIndexerOpDelete:
+		batch.Delete(id)
+	default:
+		log.Error(4, "Unrecognized repo indexer op: %d", update.Op)
+	}
+	return nil
+}
+
+// InitRepoIndexer initialize repo indexer
+func InitRepoIndexer(populateIndexer func() error) {
+	_, err := os.Stat(setting.Indexer.RepoPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if err = createRepoIndexer(); err != nil {
+				log.Fatal(4, "CreateRepoIndexer: %v", err)
+			}
+			if err = populateIndexer(); err != nil {
+				log.Fatal(4, "PopulateRepoIndex: %v", err)
+			}
+		} else {
+			log.Fatal(4, "InitRepoIndexer: %v", err)
+		}
+	} else {
+		repoIndexer, err = bleve.Open(setting.Indexer.RepoPath)
+		if err != nil {
+			log.Fatal(4, "InitRepoIndexer, open index: %v", err)
+		}
+	}
+}
+
+// createRepoIndexer create a repo indexer if one does not already exist
+func createRepoIndexer() error {
+	docMapping := bleve.NewDocumentMapping()
+	docMapping.AddFieldMappingsAt("RepoID", bleve.NewNumericFieldMapping())
+
+	textFieldMapping := bleve.NewTextFieldMapping()
+	docMapping.AddFieldMappingsAt("Content", textFieldMapping)
+
+	mapping := bleve.NewIndexMapping()
+	if err := addUnicodeNormalizeTokenFilter(mapping); err != nil {
+		return err
+	} else if err := mapping.AddCustomAnalyzer(repoIndexerAnalyzer, map[string]interface{}{
+		"type":          custom.Name,
+		"char_filters":  []string{},
+		"tokenizer":     unicode.Name,
+		"token_filters": []string{unicodeNormalizeName, camelcase.Name, lowercase.Name},
+	}); err != nil {
+		return err
+	}
+	mapping.DefaultAnalyzer = repoIndexerAnalyzer
+	mapping.AddDocumentMapping("repo", docMapping)
+	var err error
+	repoIndexer, err = bleve.New(setting.Indexer.RepoPath, mapping)
+	return err
+}
+
+func filenameIndexerID(repoID int64, filename string) string {
+	return indexerID(repoID) + "_" + filename
+}
+
+func filenameOfIndexerID(indexerID string) string {
+	index := strings.IndexByte(indexerID, '_')
+	if index == -1 {
+		log.Error(4, "Unexpected ID in repo indexer: %s", indexerID)
+	}
+	return indexerID[index+1:]
+}
+
+// RepoIndexerBatch batch to add updates to
+func RepoIndexerBatch() *Batch {
+	return &Batch{
+		batch: repoIndexer.NewBatch(),
+		index: repoIndexer,
+	}
+}
+
+// DeleteRepoFromIndexer delete all of a repo's files from indexer
+func DeleteRepoFromIndexer(repoID int64) error {
+	query := numericEqualityQuery(repoID, "RepoID")
+	searchRequest := bleve.NewSearchRequestOptions(query, 2147483647, 0, false)
+	result, err := repoIndexer.Search(searchRequest)
+	if err != nil {
+		return err
+	}
+	batch := RepoIndexerBatch()
+	for _, hit := range result.Hits {
+		batch.batch.Delete(hit.ID)
+		if err = batch.flushIfFull(); err != nil {
+			return err
+		}
+	}
+	return batch.Flush()
+}
+
+// RepoSearchResult result of performing a search in a repo
+type RepoSearchResult struct {
+	StartIndex int
+	EndIndex   int
+	Filename   string
+	Content    string
+}
+
+// SearchRepoByKeyword searches for files in the specified repo.
+// Returns the matching file-paths
+func SearchRepoByKeyword(repoID int64, keyword string, page, pageSize int) (int64, []*RepoSearchResult, error) {
+	phraseQuery := bleve.NewMatchPhraseQuery(keyword)
+	phraseQuery.FieldVal = "Content"
+	phraseQuery.Analyzer = repoIndexerAnalyzer
+	indexerQuery := bleve.NewConjunctionQuery(
+		numericEqualityQuery(repoID, "RepoID"),
+		phraseQuery,
+	)
+	from := (page - 1) * pageSize
+	searchRequest := bleve.NewSearchRequestOptions(indexerQuery, pageSize, from, false)
+	searchRequest.Fields = []string{"Content"}
+	searchRequest.IncludeLocations = true
+
+	result, err := repoIndexer.Search(searchRequest)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	searchResults := make([]*RepoSearchResult, len(result.Hits))
+	for i, hit := range result.Hits {
+		var startIndex, endIndex int = -1, -1
+		for _, locations := range hit.Locations["Content"] {
+			location := locations[0]
+			locationStart := int(location.Start)
+			locationEnd := int(location.End)
+			if startIndex < 0 || locationStart < startIndex {
+				startIndex = locationStart
+			}
+			if endIndex < 0 || locationEnd > endIndex {
+				endIndex = locationEnd
+			}
+		}
+		searchResults[i] = &RepoSearchResult{
+			StartIndex: startIndex,
+			EndIndex:   endIndex,
+			Filename:   filenameOfIndexerID(hit.ID),
+			Content:    hit.Fields["Content"].(string),
+		}
+	}
+	return int64(result.Total), searchResults, nil
+}