MB-71969 Propagate custom_filter/custom_score callback errors

search/query/custom_query_test.go

@@ -104,7 +104,7 @@ func TestCustomFilterQueryMarshalJSONPreservesPayloadAndRewritesChild(t *testing
 	}
 
 	q := NewCustomFilterQueryWithFilter(NewMatchQuery("ipa"),
-		func(d *search.DocumentMatch) bool { return true }, []string{"abv"}, payload)
+		func(d *search.DocumentMatch) (bool, error) { return true, nil }, []string{"abv"}, payload)
 
 	out, err := q.MarshalJSON()
 	if err != nil {
@@ -154,7 +154,7 @@ func TestCustomScoreQueryMarshalJSONPreservesPayloadAndRewritesChild(t *testing.
 	}
 
 	q := NewCustomScoreQueryWithScorer(NewMatchQuery("ipa"),
-		func(d *search.DocumentMatch) float64 { return d.Score }, []string{"ibu"}, payload)
+		func(d *search.DocumentMatch) (float64, error) { return d.Score, nil }, []string{"ibu"}, payload)
 
 	out, err := q.MarshalJSON()
 	if err != nil {

search/searcher/search_custom_filter.go

@@ -32,8 +32,10 @@ func init() {
 
 // CustomFilterFunc decides whether a hit (with doc-value fields populated)
 // should be kept. Unlike FilterFunc it does not receive a SearchContext since
-// custom-query callbacks only need the DocumentMatch.
-type CustomFilterFunc func(d *search.DocumentMatch) bool
+// custom-query callbacks only need the DocumentMatch. A non-nil error aborts
+// the search so the failure can be surfaced to the caller rather than silently
+// dropping the hit.
+type CustomFilterFunc func(d *search.DocumentMatch) (bool, error)
 
 // CustomFilterSearcher wraps a child searcher, optionally loads doc values
 // into each DocumentMatch, then applies a CustomFilterFunc to decide whether
@@ -71,7 +73,11 @@ func (f *CustomFilterSearcher) Next(ctx *search.SearchContext) (*search.Document
 		if err = loadDocValuesOnHitWithTypes(next, f.dvReader, f.indexReader, f.fieldTypes); err != nil {
 			return nil, err
 		}
-		if f.accept(next) {
+		keep, ferr := f.accept(next)
+		if ferr != nil {
+			return nil, ferr
+		}
+		if keep {
 			return next, nil
 		}
 		next, err = f.child.Next(ctx)
@@ -90,7 +96,11 @@ func (f *CustomFilterSearcher) Advance(ctx *search.SearchContext, ID index.Index
 	if err = loadDocValuesOnHitWithTypes(adv, f.dvReader, f.indexReader, f.fieldTypes); err != nil {
 		return nil, err
 	}
-	if f.accept(adv) {
+	keep, ferr := f.accept(adv)
+	if ferr != nil {
+		return nil, ferr
+	}
+	if keep {
 		return adv, nil
 	}
 	return f.Next(ctx)

search/searcher/search_custom_score.go

@@ -30,8 +30,10 @@ func init() {
 	reflectStaticSizeCustomScoreSearcher = int(reflect.TypeOf(sfs).Size())
 }
 
-// CustomScoreFunc defines a function which can mutate document scores.
-type CustomScoreFunc func(d *search.DocumentMatch) float64
+// CustomScoreFunc defines a function which can mutate document scores. A
+// non-nil error aborts the search so the failure can be surfaced to the caller
+// rather than silently falling back to the original score.
+type CustomScoreFunc func(d *search.DocumentMatch) (float64, error)
 
 // CustomScoreSearcher wraps any other searcher, optionally loads doc values
 // into each DocumentMatch, then mutates the score using the supplied
@@ -60,15 +62,21 @@ func NewCustomScoreSearcher(ctx context.Context, s search.Searcher, mutate Custo
 
 // applyScore mutates the score on the hit and, when explain is enabled,
 // replaces the explanation with a single node describing the custom score
-// result.
-func (f *CustomScoreSearcher) applyScore(d *search.DocumentMatch) {
-	d.Score = f.mutate(d)
+// result. A non-nil error from the score function is returned so the caller
+// can abort the search.
+func (f *CustomScoreSearcher) applyScore(d *search.DocumentMatch) error {
+	score, err := f.mutate(d)
+	if err != nil {
+		return err
+	}
+	d.Score = score
 	if f.explain {
 		d.Expl = &search.Explanation{
 			Value:   d.Score,
 			Message: "custom_score function result",
 		}
 	}
+	return nil
 }
 
 func (f *CustomScoreSearcher) Size() int {
@@ -85,7 +93,9 @@ func (f *CustomScoreSearcher) Next(ctx *search.SearchContext) (*search.DocumentM
 		if err = loadDocValuesOnHitWithTypes(next, f.dvReader, f.indexReader, f.fieldTypes); err != nil {
 			return nil, err
 		}
-		f.applyScore(next)
+		if err = f.applyScore(next); err != nil {
+			return nil, err
+		}
 	}
 	return next, nil
 }
@@ -99,7 +109,9 @@ func (f *CustomScoreSearcher) Advance(ctx *search.SearchContext, ID index.IndexI
 		if err = loadDocValuesOnHitWithTypes(adv, f.dvReader, f.indexReader, f.fieldTypes); err != nil {
 			return nil, err
 		}
-		f.applyScore(adv)
+		if err = f.applyScore(adv); err != nil {
+			return nil, err
+		}
 	}
 	return adv, nil
 }

search_test.go

@@ -4837,9 +4837,9 @@ func TestCustomFilterQuery(t *testing.T) {
 		"7": {},
 	}
 
-	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) bool {
+	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) (bool, error) {
 		_, ok := allowedIDs[d.ID]
-		return ok
+		return ok, nil
 	}, nil, nil)
 
 	req := NewSearchRequest(q)
@@ -4884,8 +4884,8 @@ func TestCustomScoreQuery(t *testing.T) {
 		"0": 1.0,
 	}
 
-	q := query.NewCustomScoreQueryWithScorer(fictionQuery, func(d *search.DocumentMatch) float64 {
-		return d.Score + boosts[d.ID]
+	q := query.NewCustomScoreQueryWithScorer(fictionQuery, func(d *search.DocumentMatch) (float64, error) {
+		return d.Score + boosts[d.ID], nil
 	}, nil, nil)
 
 	req := NewSearchRequest(q)
@@ -4927,9 +4927,9 @@ func TestCustomFilterQueryDocumentMatchIDWithoutFields(t *testing.T) {
 		"7": {},
 	}
 
-	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) bool {
+	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) (bool, error) {
 		_, ok := allowedIDs[d.ID]
-		return ok
+		return ok, nil
 	}, nil, nil)
 
 	req := NewSearchRequest(q)
@@ -4967,12 +4967,12 @@ func TestCustomScoreQueryWithDocValues(t *testing.T) {
 	fictionQuery := NewTermQuery("fiction")
 	fictionQuery.SetField("genre")
 
-	q := query.NewCustomScoreQueryWithScorer(fictionQuery, func(d *search.DocumentMatch) float64 {
+	q := query.NewCustomScoreQueryWithScorer(fictionQuery, func(d *search.DocumentMatch) (float64, error) {
 		rating, ok := d.Fields["rating"].(float64)
 		if ok && rating >= 9 {
-			return d.Score + 100
+			return d.Score + 100, nil
 		}
-		return d.Score
+		return d.Score, nil
 	}, []string{"rating"}, nil)
 
 	req := NewSearchRequest(q)
@@ -5002,8 +5002,8 @@ func TestCustomScoreQueryExplain(t *testing.T) {
 	titleQuery := NewMatchQuery("habit")
 	titleQuery.SetField("title")
 
-	q := query.NewCustomScoreQueryWithScorer(titleQuery, func(d *search.DocumentMatch) float64 {
-		return d.Score * 2
+	q := query.NewCustomScoreQueryWithScorer(titleQuery, func(d *search.DocumentMatch) (float64, error) {
+		return d.Score * 2, nil
 	}, nil, nil)
 
 	req := NewSearchRequest(q)
@@ -5172,12 +5172,12 @@ func TestCustomFilterQueryDateTimeDocValues(t *testing.T) {
 	// Datetime doc values are decoded as RFC 3339 strings.
 	cutoffStr := cutoff.UTC().Format(time.RFC3339Nano)
 
-	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) bool {
+	q := query.NewCustomFilterQueryWithFilter(fictionQuery, func(d *search.DocumentMatch) (bool, error) {
 		pubStr, ok := d.Fields["published"].(string)
 		if !ok {
-			return false
+			return false, nil
 		}
-		return pubStr >= cutoffStr
+		return pubStr >= cutoffStr, nil
 	}, []string{"published"}, nil)
 
 	req := NewSearchRequest(q)