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search_db.go
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search_db.go
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package storage
import (
"bytes"
"fmt"
"html/template"
"os"
"path/filepath"
"regexp"
"strconv"
"github.com/blevesearch/bleve"
"github.com/blevesearch/bleve/mapping"
)
type SearchDB struct {
Path string
mapping.IndexMapping
bleve.Index
}
const (
TITLE = "title"
MODIFIED = "modified"
)
func NewSearchDB(dir string) (*SearchDB, error) {
os.RemoveAll(filepath.Dir(dir))
os.MkdirAll(filepath.Dir(dir), 0755)
indexMapping := buildIndexMapping()
index, err := bleve.Open(dir)
if err == bleve.ErrorIndexPathDoesNotExist {
index, err = bleve.New(dir, indexMapping)
if err != nil {
return nil, err
}
} else if err != nil {
return nil, err
}
return &SearchDB{
Path: dir,
IndexMapping: indexMapping,
Index: index,
}, nil
}
func buildIndexMapping() mapping.IndexMapping {
textFieldAnalyzer := "en"
pageMapping := bleve.NewDocumentMapping()
enTextFieldMapping := bleve.NewTextFieldMapping()
enTextFieldMapping.Analyzer = textFieldAnalyzer
pageMapping.AddFieldMappingsAt(TITLE, enTextFieldMapping)
dateTimeMapping := bleve.NewDateTimeFieldMapping()
pageMapping.AddFieldMappingsAt(MODIFIED, dateTimeMapping)
indexMapping := bleve.NewIndexMapping()
indexMapping.AddDocumentMapping("page", pageMapping)
indexMapping.DefaultAnalyzer = textFieldAnalyzer
return indexMapping
}
type QueryResult struct {
Phrase string
Total uint64
Took float64
QueryMatches []QueryMatch
}
func (qr *QueryResult) ToMap() map[string]interface{} {
if qr == nil {
return nil
}
return map[string]interface{}{
"phrase": qr.Phrase,
"total": qr.Total,
"took": qr.Took,
"query_matches": qr.QueryMatches,
}
}
type QueryMatch struct {
ID string
Rank int
Score float64
Modified string
Title string
Body template.HTML
}
func (s *SearchDB) Query(phrase string) (*QueryResult, error) {
sr := bleve.NewSearchRequest(bleve.NewQueryStringQuery(phrase))
sr.Highlight = bleve.NewHighlightWithStyle("html")
sr.Fields = []string{TITLE, MODIFIED}
searchResults, err := s.Search(sr)
if err != nil {
return nil, err
}
qr := QueryResult{
Phrase: phrase,
Took: formatFloat(searchResults.Took.Seconds()),
Total: searchResults.Total,
QueryMatches: make([]QueryMatch, 0),
}
for i, hit := range searchResults.Hits {
qm := QueryMatch{
Rank: i + searchResults.Request.From + 1,
ID: hit.ID,
Score: hit.Score,
Title: hit.Fields[TITLE].(string),
Modified: hit.Fields[MODIFIED].(string),
}
var buf bytes.Buffer
for _, fragments := range hit.Fragments {
for _, fragment := range fragments {
buf.WriteString(fragment + "\n")
}
}
qm.Body = template.HTML(buf.String())
qr.QueryMatches = append(qr.QueryMatches, qm)
}
return &qr, nil
}
var htmlCharFilterRegexp = regexp.MustCompile(`</?[!\w]+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)/?>`)
func filterHTMLTags(input []byte) []byte {
return htmlCharFilterRegexp.ReplaceAllFunc(input, func(in []byte) []byte {
return bytes.Repeat([]byte(``), len(in))
})
}
func formatFloat(val float64) float64 {
f, err := strconv.ParseFloat(fmt.Sprintf("%f", val), 64)
if err != nil {
return val
}
return f
}