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package search
import (
"bytes"
"context"
"encoding/gob"
"log"
"log/slog"
"os"
"path"
"searchix/internal/file"
"searchix/internal/options"
"github.com/blevesearch/bleve/v2"
"github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
"github.com/blevesearch/bleve/v2/analysis/analyzer/keyword"
"github.com/blevesearch/bleve/v2/analysis/analyzer/web"
"github.com/blevesearch/bleve/v2/analysis/token/camelcase"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/letter"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/single"
"github.com/blevesearch/bleve/v2/document"
"github.com/blevesearch/bleve/v2/mapping"
index "github.com/blevesearch/bleve_index_api"
"github.com/pkg/errors"
)
type WriteIndex struct {
index bleve.Index
}
const ExpectedIndexExtension = ".bleve"
func createIndexMapping() (mapping.IndexMapping, error) {
indexMapping := bleve.NewIndexMapping()
indexMapping.StoreDynamic = false
indexMapping.IndexDynamic = false
indexMapping.TypeField = "BleveType"
textFieldMapping := bleve.NewTextFieldMapping()
textFieldMapping.Store = false
descriptionFieldMapping := bleve.NewTextFieldMapping()
descriptionFieldMapping.Store = false
descriptionFieldMapping.Analyzer = web.Name
err := indexMapping.AddCustomAnalyzer("option_name", map[string]interface{}{
"type": custom.Name,
"tokenizer": letter.Name,
"token_filters": []string{
camelcase.Name,
},
})
if err != nil {
return nil, errors.WithMessage(err, "could not add custom analyser")
}
err = indexMapping.AddCustomAnalyzer("loc", map[string]interface{}{
"type": keyword.Name,
"tokenizer": letter.Name,
"token_filters": []string{
camelcase.Name,
},
})
if err != nil {
return nil, errors.WithMessage(err, "could not add custom analyser")
}
err = indexMapping.AddCustomAnalyzer("keyword_single", map[string]interface{}{
"type": keyword.Name,
"tokenizer": single.Name,
})
if err != nil {
return nil, errors.WithMessage(err, "could not add custom analyser")
}
keywordFieldMapping := bleve.NewKeywordFieldMapping()
keywordFieldMapping.Analyzer = "keyword_single"
nameMapping := bleve.NewTextFieldMapping()
nameMapping.Analyzer = "option_name"
nameMapping.IncludeTermVectors = true
nameMapping.Store = false
nixValueMapping := bleve.NewDocumentStaticMapping()
nixValueMapping.AddFieldMappingsAt("Text", textFieldMapping)
nixValueMapping.AddFieldMappingsAt("Markdown", textFieldMapping)
locFieldMapping := bleve.NewKeywordFieldMapping()
locFieldMapping.Analyzer = "loc"
locFieldMapping.IncludeTermVectors = true
locFieldMapping.Store = false
optionMapping := bleve.NewDocumentStaticMapping()
optionMapping.AddFieldMappingsAt("Name", keywordFieldMapping)
optionMapping.AddFieldMappingsAt("Source", keywordFieldMapping)
optionMapping.AddFieldMappingsAt("Loc", locFieldMapping)
optionMapping.AddFieldMappingsAt("RelatedPackages", textFieldMapping)
optionMapping.AddFieldMappingsAt("Description", textFieldMapping)
optionMapping.AddSubDocumentMapping("Default", nixValueMapping)
optionMapping.AddSubDocumentMapping("Example", nixValueMapping)
indexMapping.AddDocumentMapping("option", optionMapping)
return indexMapping, nil
}
func createIndex(indexPath string) (bleve.Index, error) {
indexMapping, err := createIndexMapping()
if err != nil {
return nil, err
}
idx, err := bleve.NewUsing(
indexPath,
indexMapping,
bleve.Config.DefaultIndexType,
bleve.Config.DefaultKVStore,
map[string]interface{}{
"nosync": true,
},
)
if err != nil {
return nil, errors.WithMessagef(err, "unable to create index at path %s", indexPath)
}
return idx, nil
}
func NewIndexer(indexPath string, force bool) (*WriteIndex, error) {
var err error
bleve.SetLog(log.Default())
exists, err := file.Exists(indexPath)
if err != nil {
return nil, errors.WithMessagef(
err,
"could not check if index exists at path %s",
indexPath,
)
}
var idx bleve.Index
if !exists || force {
if force {
if path.Ext(indexPath) != ExpectedIndexExtension {
return nil, errors.Errorf(
"cowardly refusing to delete path %s (it doesn't end in '%s')",
indexPath,
ExpectedIndexExtension,
)
}
err := os.RemoveAll(indexPath)
if err != nil {
return nil, errors.WithMessagef(err, "could not remove index file %s", indexPath)
}
}
idx, err = createIndex(indexPath)
} else {
idx, err = bleve.Open(indexPath)
if err != nil {
err = errors.WithMessagef(err, "could not open index at path %s", indexPath)
}
}
if err != nil {
return nil, err
}
return &WriteIndex{
idx,
}, nil
}
func (i *WriteIndex) ImportOptions(
ctx context.Context,
objects <-chan *options.NixOption,
) <-chan error {
var err error
errs := make(chan error)
go func() {
defer close(errs)
batch := i.index.NewBatch()
indexMapping := i.index.Mapping()
outer:
for opt := range objects {
select {
case <-ctx.Done():
slog.Debug("context cancelled")
break outer
default:
}
doc := document.NewDocument(opt.Source + "/" + opt.Name)
err = indexMapping.MapDocument(doc, opt)
if err != nil {
errs <- errors.WithMessagef(err, "could not map document for option: %s", opt.Name)
continue
}
var data bytes.Buffer
enc := gob.NewEncoder(&data)
err = enc.Encode(opt)
if err != nil {
errs <- errors.WithMessage(err, "could not store option in search index")
continue
}
field := document.NewTextFieldWithIndexingOptions("_data", nil, data.Bytes(), index.StoreField)
newDoc := doc.AddField(field)
// slog.Debug("adding option to index", "name", opt.Name)
err = batch.IndexAdvanced(newDoc)
if err != nil {
errs <- errors.WithMessagef(err, "could not index option %s", opt.Name)
continue
}
}
size := batch.Size()
slog.Debug("flushing batch", "size", size)
err := i.index.Batch(batch)
if err != nil {
errs <- errors.WithMessagef(err, "could not flush batch")
}
}()
return errs
}
func (i *WriteIndex) Close() error {
err := i.index.Close()
if err != nil {
return errors.WithMessagef(err, "could not close index")
}
return nil
}
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