Make SearchMode have default value and add comments (#33863)

* Make `SearchMode` have default value if it is empty
* Add some comments for the "match" queries
* Fix a copy-paste mistake in `buildMatchQuery` (`db.go`)
* Add missing `q.Analyzer = repoIndexerAnalyzer`, it is in old code,
although I do not see real difference ....

modules/indexer/code/bleve/bleve.go

@@ -25,6 +25,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/typesniffer"
+	"code.gitea.io/gitea/modules/util"
 
 	"github.com/blevesearch/bleve/v2"
 	analyzer_custom "github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
@@ -272,14 +273,18 @@ func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int
 	pathQuery.FieldVal = "Filename"
 	pathQuery.SetBoost(10)
 
-	if opts.SearchMode == indexer.SearchModeExact {
+	searchMode := util.IfZero(opts.SearchMode, b.SupportedSearchModes()[0].ModeValue)
+	if searchMode == indexer.SearchModeExact {
+		// 1.21 used NewPrefixQuery, but it seems not working well, and later releases changed to NewMatchPhraseQuery
 		q := bleve.NewMatchPhraseQuery(opts.Keyword)
+		q.Analyzer = repoIndexerAnalyzer
 		q.FieldVal = "Content"
 		contentQuery = q
 	} else /* words */ {
 		q := bleve.NewMatchQuery(opts.Keyword)
 		q.FieldVal = "Content"
-		if opts.SearchMode == indexer.SearchModeFuzzy {
+		q.Analyzer = repoIndexerAnalyzer
+		if searchMode == indexer.SearchModeFuzzy {
 			// this logic doesn't seem right, it is only used to pass the test-case `Keyword:    "dESCRIPTION"`, which doesn't seem to be a real-life use-case.
 			q.Fuzziness = inner_bleve.GuessFuzzinessByKeyword(opts.Keyword)
 		} else {

modules/indexer/code/elasticsearch/elasticsearch.go

@@ -25,6 +25,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/typesniffer"
+	"code.gitea.io/gitea/modules/util"
 
 	"github.com/go-enry/go-enry/v2"
 	"github.com/olivere/elastic/v7"
@@ -365,7 +366,9 @@ func extractAggs(searchResult *elastic.SearchResult) []*internal.SearchResultLan
 // Search searches for codes and language stats by given conditions.
 func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
 	var contentQuery elastic.Query
-	if opts.SearchMode == indexer.SearchModeExact {
+	searchMode := util.IfZero(opts.SearchMode, b.SupportedSearchModes()[0].ModeValue)
+	if searchMode == indexer.SearchModeExact {
+		// 1.21 used NewMultiMatchQuery().Type(esMultiMatchTypePhrasePrefix), but later releases changed to NewMatchPhraseQuery
 		contentQuery = elastic.NewMatchPhraseQuery("content", opts.Keyword)
 	} else /* words */ {
 		contentQuery = elastic.NewMultiMatchQuery("content", opts.Keyword).Type(esMultiMatchTypeBestFields).Operator("and")

modules/indexer/code/indexer_test.go

@@ -17,6 +17,7 @@ import (
 	"code.gitea.io/gitea/modules/indexer/code/internal"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/modules/util"
 
 	_ "code.gitea.io/gitea/models"
 	_ "code.gitea.io/gitea/models/actions"
@@ -240,7 +241,7 @@ func testIndexer(name string, t *testing.T, indexer internal.Indexer) {
 				total, res, langs, err := indexer.Search(t.Context(), &internal.SearchOptions{
 					RepoIDs:    kw.RepoIDs,
 					Keyword:    kw.Keyword,
-					SearchMode: kw.SearchMode,
+					SearchMode: util.IfZero(kw.SearchMode, indexer_module.SearchModeWords),
 					Paginator: &db.ListOptions{
 						Page:     1,
 						PageSize: 10,

modules/indexer/issues/bleve/bleve.go

@@ -10,6 +10,7 @@ import (
 	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
 	inner_bleve "code.gitea.io/gitea/modules/indexer/internal/bleve"
 	"code.gitea.io/gitea/modules/indexer/issues/internal"
+	"code.gitea.io/gitea/modules/util"
 
 	"github.com/blevesearch/bleve/v2"
 	"github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
@@ -162,9 +163,10 @@ func (b *Indexer) Search(ctx context.Context, options *internal.SearchOptions) (
 	var queries []query.Query
 
 	if options.Keyword != "" {
-		if options.SearchMode == indexer.SearchModeWords || options.SearchMode == indexer.SearchModeFuzzy {
+		searchMode := util.IfZero(options.SearchMode, b.SupportedSearchModes()[0].ModeValue)
+		if searchMode == indexer.SearchModeWords || searchMode == indexer.SearchModeFuzzy {
 			fuzziness := 0
-			if options.SearchMode == indexer.SearchModeFuzzy {
+			if searchMode == indexer.SearchModeFuzzy {
 				fuzziness = inner_bleve.GuessFuzzinessByKeyword(options.Keyword)
 			}
 			queries = append(queries, bleve.NewDisjunctionQuery([]query.Query{

modules/indexer/issues/db/db.go

@@ -13,6 +13,7 @@ import (
 	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
 	inner_db "code.gitea.io/gitea/modules/indexer/internal/db"
 	"code.gitea.io/gitea/modules/indexer/issues/internal"
+	"code.gitea.io/gitea/modules/util"
 
 	"xorm.io/builder"
 )
@@ -46,7 +47,7 @@ func (i *Indexer) Delete(_ context.Context, _ ...int64) error {
 
 func buildMatchQuery(mode indexer.SearchModeType, colName, keyword string) builder.Cond {
 	if mode == indexer.SearchModeExact {
-		return db.BuildCaseInsensitiveLike("issue.name", keyword)
+		return db.BuildCaseInsensitiveLike(colName, keyword)
 	}
 
 	// match words
@@ -84,16 +85,16 @@ func (i *Indexer) Search(ctx context.Context, options *internal.SearchOptions) (
 			repoCond = builder.Eq{"repo_id": options.RepoIDs[0]}
 		}
 		subQuery := builder.Select("id").From("issue").Where(repoCond)
-
+		searchMode := util.IfZero(options.SearchMode, i.SupportedSearchModes()[0].ModeValue)
 		cond = builder.Or(
-			buildMatchQuery(options.SearchMode, "issue.name", options.Keyword),
+			buildMatchQuery(searchMode, "issue.name", options.Keyword),
-			buildMatchQuery(options.SearchMode, "issue.content", options.Keyword),
+			buildMatchQuery(searchMode, "issue.content", options.Keyword),
 			builder.In("issue.id", builder.Select("issue_id").
 				From("comment").
 				Where(builder.And(
 					builder.Eq{"type": issue_model.CommentTypeComment},
 					builder.In("issue_id", subQuery),
-					buildMatchQuery(options.SearchMode, "content", options.Keyword),
+					buildMatchQuery(searchMode, "content", options.Keyword),
 				)),
 			),
 		)

modules/indexer/issues/elasticsearch/elasticsearch.go

@@ -14,6 +14,7 @@ import (
 	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
 	inner_elasticsearch "code.gitea.io/gitea/modules/indexer/internal/elasticsearch"
 	"code.gitea.io/gitea/modules/indexer/issues/internal"
+	"code.gitea.io/gitea/modules/util"
 
 	"github.com/olivere/elastic/v7"
 )
@@ -152,7 +153,8 @@ func (b *Indexer) Search(ctx context.Context, options *internal.SearchOptions) (
 	query := elastic.NewBoolQuery()
 
 	if options.Keyword != "" {
-		if options.SearchMode == indexer.SearchModeExact {
+		searchMode := util.IfZero(options.SearchMode, b.SupportedSearchModes()[0].ModeValue)
+		if searchMode == indexer.SearchModeExact {
 			query.Must(elastic.NewMultiMatchQuery(options.Keyword, "title", "content", "comments").Type(esMultiMatchTypePhrasePrefix))
 		} else /* words */ {
 			query.Must(elastic.NewMultiMatchQuery(options.Keyword, "title", "content", "comments").Type(esMultiMatchTypeBestFields).Operator("and"))

modules/indexer/issues/indexer.go

@@ -282,7 +282,7 @@ const (
 
 // SearchIssues search issues by options.
 func SearchIssues(ctx context.Context, opts *SearchOptions) ([]int64, int64, error) {
-	indexer := *globalIndexer.Load()
+	ix := *globalIndexer.Load()
 
 	if opts.Keyword == "" || opts.IsKeywordNumeric() {
 		// This is a conservative shortcut.
@@ -291,10 +291,9 @@ func SearchIssues(ctx context.Context, opts *SearchOptions) ([]int64, int64, err
 		// So if the user creates an issue and list issues immediately, the issue may not be listed because the indexer needs time to index the issue.
 		// Even worse, the external indexer like elastic search may not be available for a while,
 		// and the user may not be able to list issues completely until it is available again.
-		indexer = db.NewIndexer()
+		ix = db.NewIndexer()
 	}
-
+	result, err := ix.Search(ctx, opts)
-	result, err := indexer.Search(ctx, opts)
 	if err != nil {
 		return nil, 0, err
 	}

modules/indexer/issues/indexer_test.go

@@ -82,9 +82,11 @@ func searchIssueWithKeyword(t *testing.T) {
 	}
 
 	for _, test := range tests {
+		t.Run(test.opts.Keyword, func(t *testing.T) {
 			issueIDs, _, err := SearchIssues(t.Context(), &test.opts)
 			require.NoError(t, err)
 			assert.Equal(t, test.expectedIDs, issueIDs)
+		})
 	}
 }