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// 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
}
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