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package repository
import (
"fmt"
"os"
"strings"
"sync"
"unicode/utf8"
"github.com/blevesearch/bleve"
)
var _ Index = &bleveIndex{}
type bleveIndex struct {
path string
mu sync.RWMutex
index bleve.Index
}
func openBleveIndex(path string) (*bleveIndex, error) {
index, err := bleve.Open(path)
if err == nil {
return &bleveIndex{path: path, index: index}, nil
}
b := &bleveIndex{path: path}
err = b.makeIndex()
if err != nil {
return nil, err
}
return b, nil
}
func (b *bleveIndex) makeIndex() error {
err := os.MkdirAll(b.path, os.ModePerm)
if err != nil {
return err
}
// TODO: follow https://github.com/blevesearch/bleve/issues/1576 recommendations
mapping := bleve.NewIndexMapping()
mapping.DefaultAnalyzer = "en"
index, err := bleve.New(b.path, mapping)
if err != nil {
return err
}
b.index = index
return nil
}
func (b *bleveIndex) IndexOne(id string, texts []string) error {
b.mu.Lock()
defer b.mu.Unlock()
return b._index(b.index.Index, id, texts)
}
func (b *bleveIndex) IndexBatch() (indexer func(id string, texts []string) error, closer func() error) {
b.mu.Lock()
defer b.mu.Unlock()
batch := b.index.NewBatch()
indexer = func(id string, texts []string) error {
return b._index(batch.Index, id, texts)
}
closer = func() error {
return b.index.Batch(batch)
}
return indexer, closer
}
func (b *bleveIndex) _index(indexer func(string, interface{}) error, id string, texts []string) error {
searchable := struct{ Text []string }{Text: texts}
// See https://github.com/blevesearch/bleve/issues/1576
var sb strings.Builder
normalize := func(text string) string {
sb.Reset()
for _, field := range strings.Fields(text) {
if utf8.RuneCountInString(field) < 100 {
sb.WriteString(field)
sb.WriteRune(' ')
}
}
return sb.String()
}
for i, s := range searchable.Text {
searchable.Text[i] = normalize(s)
}
return indexer(id, searchable)
}
func (b *bleveIndex) Search(terms []string) ([]string, error) {
b.mu.RLock()
defer b.mu.RUnlock()
for i, term := range terms {
if strings.Contains(term, " ") {
terms[i] = fmt.Sprintf("\"%s\"", term)
}
}
query := bleve.NewQueryStringQuery(strings.Join(terms, " "))
search := bleve.NewSearchRequest(query)
res, err := b.index.Search(search)
if err != nil {
return nil, err
}
ids := make([]string, len(res.Hits))
for i, hit := range res.Hits {
ids[i] = hit.ID
}
return ids, nil
}
func (b *bleveIndex) DocCount() (uint64, error) {
return b.index.DocCount()
}
func (b *bleveIndex) Clear() error {
b.mu.Lock()
defer b.mu.Unlock()
err := b.index.Close()
if err != nil {
return err
}
err = os.RemoveAll(b.path)
if err != nil {
return err
}
return b.makeIndex()
}
func (b *bleveIndex) Close() error {
b.mu.Lock()
defer b.mu.Unlock()
return b.index.Close()
}
|
