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forgejo/modules/indexer/code/bleve/bleve.go
6543 ab5f0b7558
Determine fuzziness of bleve indexer by keyword length ()
also bleve did match on fuzzy search and the other way around. this also fix that bug.

(cherry picked from commit b9c57fb78e8e0d80d786d8e1da433b6c7ebf2f1c)

Conflicts:
	tests/integration/repo_search_test.go
	simple conflict resolution in the tests
2024-03-26 19:04:27 +01:00

352 lines
11 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package bleve
import (
"bufio"
"context"
"fmt"
"io"
"strconv"
"strings"
"time"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/analyze"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/indexer/code/internal"
indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
inner_bleve "code.gitea.io/gitea/modules/indexer/internal/bleve"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/typesniffer"
"github.com/blevesearch/bleve/v2"
analyzer_custom "github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
analyzer_keyword "github.com/blevesearch/bleve/v2/analysis/analyzer/keyword"
"github.com/blevesearch/bleve/v2/analysis/token/camelcase"
"github.com/blevesearch/bleve/v2/analysis/token/lowercase"
"github.com/blevesearch/bleve/v2/analysis/token/unicodenorm"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/unicode"
"github.com/blevesearch/bleve/v2/mapping"
"github.com/blevesearch/bleve/v2/search/query"
"github.com/go-enry/go-enry/v2"
)
const (
unicodeNormalizeName = "unicodeNormalize"
maxBatchSize = 16
// fuzzyDenominator determines the levenshtein distance per each character of a keyword
fuzzyDenominator = 4
)
func addUnicodeNormalizeTokenFilter(m *mapping.IndexMappingImpl) error {
return m.AddCustomTokenFilter(unicodeNormalizeName, map[string]any{
"type": unicodenorm.Name,
"form": unicodenorm.NFC,
})
}
// RepoIndexerData data stored in the repo indexer
type RepoIndexerData struct {
RepoID int64
CommitID string
Content string
Language string
UpdatedAt time.Time
}
// Type returns the document type, for bleve's mapping.Classifier interface.
func (d *RepoIndexerData) Type() string {
return repoIndexerDocType
}
const (
repoIndexerAnalyzer = "repoIndexerAnalyzer"
repoIndexerDocType = "repoIndexerDocType"
repoIndexerLatestVersion = 6
)
// generateBleveIndexMapping generates a bleve index mapping for the repo indexer
func generateBleveIndexMapping() (mapping.IndexMapping, error) {
docMapping := bleve.NewDocumentMapping()
numericFieldMapping := bleve.NewNumericFieldMapping()
numericFieldMapping.IncludeInAll = false
docMapping.AddFieldMappingsAt("RepoID", numericFieldMapping)
textFieldMapping := bleve.NewTextFieldMapping()
textFieldMapping.IncludeInAll = false
docMapping.AddFieldMappingsAt("Content", textFieldMapping)
termFieldMapping := bleve.NewTextFieldMapping()
termFieldMapping.IncludeInAll = false
termFieldMapping.Analyzer = analyzer_keyword.Name
docMapping.AddFieldMappingsAt("Language", termFieldMapping)
docMapping.AddFieldMappingsAt("CommitID", termFieldMapping)
timeFieldMapping := bleve.NewDateTimeFieldMapping()
timeFieldMapping.IncludeInAll = false
docMapping.AddFieldMappingsAt("UpdatedAt", timeFieldMapping)
mapping := bleve.NewIndexMapping()
if err := addUnicodeNormalizeTokenFilter(mapping); err != nil {
return nil, err
} else if err := mapping.AddCustomAnalyzer(repoIndexerAnalyzer, map[string]any{
"type": analyzer_custom.Name,
"char_filters": []string{},
"tokenizer": unicode.Name,
"token_filters": []string{unicodeNormalizeName, camelcase.Name, lowercase.Name},
}); err != nil {
return nil, err
}
mapping.DefaultAnalyzer = repoIndexerAnalyzer
mapping.AddDocumentMapping(repoIndexerDocType, docMapping)
mapping.AddDocumentMapping("_all", bleve.NewDocumentDisabledMapping())
return mapping, nil
}
var _ internal.Indexer = &Indexer{}
// Indexer represents a bleve indexer implementation
type Indexer struct {
inner *inner_bleve.Indexer
indexer_internal.Indexer // do not composite inner_bleve.Indexer directly to avoid exposing too much
}
// NewIndexer creates a new bleve local indexer
func NewIndexer(indexDir string) *Indexer {
inner := inner_bleve.NewIndexer(indexDir, repoIndexerLatestVersion, generateBleveIndexMapping)
return &Indexer{
Indexer: inner,
inner: inner,
}
}
func (b *Indexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, commitSha string,
update internal.FileUpdate, repo *repo_model.Repository, batch *inner_bleve.FlushingBatch,
) error {
// Ignore vendored files in code search
if setting.Indexer.ExcludeVendored && analyze.IsVendor(update.Filename) {
return nil
}
size := update.Size
var err error
if !update.Sized {
var stdout string
stdout, _, err = git.NewCommand(ctx, "cat-file", "-s").AddDynamicArguments(update.BlobSha).RunStdString(&git.RunOpts{Dir: repo.RepoPath()})
if err != nil {
return err
}
if size, err = strconv.ParseInt(strings.TrimSpace(stdout), 10, 64); err != nil {
return fmt.Errorf("misformatted git cat-file output: %w", err)
}
}
if size > setting.Indexer.MaxIndexerFileSize {
return b.addDelete(update.Filename, repo, batch)
}
if _, err := batchWriter.Write([]byte(update.BlobSha + "\n")); err != nil {
return err
}
_, _, size, err = git.ReadBatchLine(batchReader)
if err != nil {
return err
}
fileContents, err := io.ReadAll(io.LimitReader(batchReader, size))
if err != nil {
return err
} else if !typesniffer.DetectContentType(fileContents).IsText() {
// FIXME: UTF-16 files will probably fail here
return nil
}
if _, err = batchReader.Discard(1); err != nil {
return err
}
id := internal.FilenameIndexerID(repo.ID, update.Filename)
return batch.Index(id, &RepoIndexerData{
RepoID: repo.ID,
CommitID: commitSha,
Content: string(charset.ToUTF8DropErrors(fileContents, charset.ConvertOpts{})),
Language: analyze.GetCodeLanguage(update.Filename, fileContents),
UpdatedAt: time.Now().UTC(),
})
}
func (b *Indexer) addDelete(filename string, repo *repo_model.Repository, batch *inner_bleve.FlushingBatch) error {
id := internal.FilenameIndexerID(repo.ID, filename)
return batch.Delete(id)
}
// Index indexes the data
func (b *Indexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *internal.RepoChanges) error {
batch := inner_bleve.NewFlushingBatch(b.inner.Indexer, maxBatchSize)
if len(changes.Updates) > 0 {
// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
if err := git.EnsureValidGitRepository(ctx, repo.RepoPath()); err != nil {
log.Error("Unable to open git repo: %s for %-v: %v", repo.RepoPath(), repo, err)
return err
}
batchWriter, batchReader, cancel := git.CatFileBatch(ctx, repo.RepoPath())
defer cancel()
for _, update := range changes.Updates {
if err := b.addUpdate(ctx, 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 {
return err
}
}
return batch.Flush()
}
// Delete deletes indexes by ids
func (b *Indexer) Delete(_ context.Context, repoID int64) error {
query := inner_bleve.NumericEqualityQuery(repoID, "RepoID")
searchRequest := bleve.NewSearchRequestOptions(query, 2147483647, 0, false)
result, err := b.inner.Indexer.Search(searchRequest)
if err != nil {
return err
}
batch := inner_bleve.NewFlushingBatch(b.inner.Indexer, maxBatchSize)
for _, hit := range result.Hits {
if err = batch.Delete(hit.ID); err != nil {
return err
}
}
return batch.Flush()
}
// Search searches for files in the specified repo.
// Returns the matching file-paths
func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
var (
indexerQuery query.Query
keywordQuery query.Query
)
phraseQuery := bleve.NewMatchPhraseQuery(opts.Keyword)
phraseQuery.FieldVal = "Content"
phraseQuery.Analyzer = repoIndexerAnalyzer
keywordQuery = phraseQuery
if opts.IsKeywordFuzzy {
phraseQuery.Fuzziness = len(opts.Keyword) / fuzzyDenominator
}
if len(opts.RepoIDs) > 0 {
repoQueries := make([]query.Query, 0, len(opts.RepoIDs))
for _, repoID := range opts.RepoIDs {
repoQueries = append(repoQueries, inner_bleve.NumericEqualityQuery(repoID, "RepoID"))
}
indexerQuery = bleve.NewConjunctionQuery(
bleve.NewDisjunctionQuery(repoQueries...),
keywordQuery,
)
} else {
indexerQuery = keywordQuery
}
// Save for reuse without language filter
facetQuery := indexerQuery
if len(opts.Language) > 0 {
languageQuery := bleve.NewMatchQuery(opts.Language)
languageQuery.FieldVal = "Language"
languageQuery.Analyzer = analyzer_keyword.Name
indexerQuery = bleve.NewConjunctionQuery(
indexerQuery,
languageQuery,
)
}
from, pageSize := opts.GetSkipTake()
searchRequest := bleve.NewSearchRequestOptions(indexerQuery, pageSize, from, false)
searchRequest.Fields = []string{"Content", "RepoID", "Language", "CommitID", "UpdatedAt"}
searchRequest.IncludeLocations = true
if len(opts.Language) == 0 {
searchRequest.AddFacet("languages", bleve.NewFacetRequest("Language", 10))
}
result, err := b.inner.Indexer.SearchInContext(ctx, searchRequest)
if err != nil {
return 0, nil, nil, err
}
total := int64(result.Total)
searchResults := make([]*internal.SearchResult, len(result.Hits))
for i, hit := range result.Hits {
startIndex, endIndex := -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
}
}
language := hit.Fields["Language"].(string)
var updatedUnix timeutil.TimeStamp
if t, err := time.Parse(time.RFC3339, hit.Fields["UpdatedAt"].(string)); err == nil {
updatedUnix = timeutil.TimeStamp(t.Unix())
}
searchResults[i] = &internal.SearchResult{
RepoID: int64(hit.Fields["RepoID"].(float64)),
StartIndex: startIndex,
EndIndex: endIndex,
Filename: internal.FilenameOfIndexerID(hit.ID),
Content: hit.Fields["Content"].(string),
CommitID: hit.Fields["CommitID"].(string),
UpdatedUnix: updatedUnix,
Language: language,
Color: enry.GetColor(language),
}
}
searchResultLanguages := make([]*internal.SearchResultLanguages, 0, 10)
if len(opts.Language) > 0 {
// Use separate query to go get all language counts
facetRequest := bleve.NewSearchRequestOptions(facetQuery, 1, 0, false)
facetRequest.Fields = []string{"Content", "RepoID", "Language", "CommitID", "UpdatedAt"}
facetRequest.IncludeLocations = true
facetRequest.AddFacet("languages", bleve.NewFacetRequest("Language", 10))
if result, err = b.inner.Indexer.Search(facetRequest); err != nil {
return 0, nil, nil, err
}
}
languagesFacet := result.Facets["languages"]
for _, term := range languagesFacet.Terms.Terms() {
if len(term.Term) == 0 {
continue
}
searchResultLanguages = append(searchResultLanguages, &internal.SearchResultLanguages{
Language: term.Term,
Color: enry.GetColor(term.Term),
Count: term.Count,
})
}
return total, searchResults, searchResultLanguages, nil
}