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// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !wasm
// +build !wasm
package fulltext
import (
"strings"
"github.com/blevesearch/bleve/v2"
"github.com/blevesearch/bleve/v2/mapping"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
)
// Search contains all existing bleve.Index
type Search struct {
FulltextIndex bleve.Index
}
// IndexElement describes the layout of an element to index
type IndexElement struct {
EventID string
RoomID string
Content string
ContentType string
StreamPosition int64
}
// SetContentType sets i.ContentType given an identifier
func (i *IndexElement) SetContentType(v string) {
switch v {
case "m.room.message":
i.ContentType = "content.body"
case gomatrixserverlib.MRoomName:
i.ContentType = "content.name"
case gomatrixserverlib.MRoomTopic:
i.ContentType = "content.topic"
}
}
// New opens a new/existing fulltext index
func New(cfg config.Fulltext) (fts *Search, err error) {
fts = &Search{}
fts.FulltextIndex, err = openIndex(cfg)
if err != nil {
return nil, err
}
return fts, nil
}
// Close closes the fulltext index
func (f *Search) Close() error {
return f.FulltextIndex.Close()
}
// Index indexes the given elements
func (f *Search) Index(elements ...IndexElement) error {
batch := f.FulltextIndex.NewBatch()
for _, element := range elements {
err := batch.Index(element.EventID, element)
if err != nil {
return err
}
}
return f.FulltextIndex.Batch(batch)
}
// Delete deletes an indexed element by the eventID
func (f *Search) Delete(eventID string) error {
return f.FulltextIndex.Delete(eventID)
}
// Search searches the index given a search term, roomIDs and keys.
func (f *Search) Search(term string, roomIDs, keys []string, limit, from int, orderByStreamPos bool) (*bleve.SearchResult, error) {
qry := bleve.NewConjunctionQuery()
termQuery := bleve.NewBooleanQuery()
terms := strings.Split(term, " ")
for _, term := range terms {
matchQuery := bleve.NewMatchQuery(term)
matchQuery.SetField("Content")
termQuery.AddMust(matchQuery)
}
qry.AddQuery(termQuery)
roomQuery := bleve.NewBooleanQuery()
for _, roomID := range roomIDs {
roomSearch := bleve.NewMatchQuery(roomID)
roomSearch.SetField("RoomID")
roomQuery.AddShould(roomSearch)
}
if len(roomIDs) > 0 {
qry.AddQuery(roomQuery)
}
keyQuery := bleve.NewBooleanQuery()
for _, key := range keys {
keySearch := bleve.NewMatchQuery(key)
keySearch.SetField("ContentType")
keyQuery.AddShould(keySearch)
}
if len(keys) > 0 {
qry.AddQuery(keyQuery)
}
s := bleve.NewSearchRequestOptions(qry, limit, from, false)
s.Fields = []string{"*"}
s.SortBy([]string{"_score"})
if orderByStreamPos {
s.SortBy([]string{"-StreamPosition"})
}
return f.FulltextIndex.Search(s)
}
func openIndex(cfg config.Fulltext) (bleve.Index, error) {
m := getMapping(cfg)
if cfg.InMemory {
return bleve.NewMemOnly(m)
}
if index, err := bleve.Open(string(cfg.IndexPath)); err == nil {
return index, nil
}
index, err := bleve.New(string(cfg.IndexPath), m)
if err != nil {
return nil, err
}
return index, nil
}
func getMapping(cfg config.Fulltext) *mapping.IndexMappingImpl {
enFieldMapping := bleve.NewTextFieldMapping()
enFieldMapping.Analyzer = cfg.Language
eventMapping := bleve.NewDocumentMapping()
eventMapping.AddFieldMappingsAt("Content", enFieldMapping)
eventMapping.AddFieldMappingsAt("StreamPosition", bleve.NewNumericFieldMapping())
// Index entries as is
idFieldMapping := bleve.NewKeywordFieldMapping()
eventMapping.AddFieldMappingsAt("ContentType", idFieldMapping)
eventMapping.AddFieldMappingsAt("RoomID", idFieldMapping)
eventMapping.AddFieldMappingsAt("EventID", idFieldMapping)
indexMapping := bleve.NewIndexMapping()
indexMapping.AddDocumentMapping("Event", eventMapping)
indexMapping.DefaultType = "Event"
return indexMapping
}
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