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package search
import (
"context"
"log"
"os"
"path"
"sync"
"searchix/internal/options"
"github.com/bcicen/jstream"
"github.com/blevesearch/bleve/v2"
"github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
"github.com/blevesearch/bleve/v2/analysis/token/camelcase"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/letter"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
)
const ResultsPerPage = 20
type Result[T options.NixOption] struct {
*bleve.SearchResult
Results []T
}
type Index[T options.NixOption] struct {
index bleve.Index
docs *sync.Map
}
func New[T options.NixOption](kind string) (*Index[T], error) {
var err error
bleve.SetLog(log.Default())
indexMapping := bleve.NewIndexMapping()
textFieldMapping := bleve.NewTextFieldMapping()
descriptionFieldMapping := bleve.NewTextFieldMapping()
descriptionFieldMapping.Analyzer = "web"
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")
}
nameMapping := bleve.NewTextFieldMapping()
nameMapping.Analyzer = "option_name"
nameMapping.IncludeTermVectors = true
nixValueMapping := bleve.NewDocumentStaticMapping()
nixValueMapping.AddFieldMappingsAt("Text", textFieldMapping)
nixValueMapping.AddFieldMappingsAt("Markdown", textFieldMapping)
optionMapping := bleve.NewDocumentStaticMapping()
optionMapping.AddFieldMappingsAt("Option", nameMapping)
optionMapping.AddFieldMappingsAt("Loc", bleve.NewKeywordFieldMapping())
optionMapping.AddFieldMappingsAt("RelatedPackages", textFieldMapping)
optionMapping.AddFieldMappingsAt("Description", textFieldMapping)
optionMapping.AddSubDocumentMapping("Default", nixValueMapping)
optionMapping.AddSubDocumentMapping("Example", nixValueMapping)
indexMapping.AddDocumentMapping("option", optionMapping)
index, err := bleve.NewMemOnly(indexMapping)
// index, err = bleve.New(path.Join(cfg.DataPath, const indexFilename = "index.bleve"), indexMapping)
if err != nil {
return nil, errors.WithMessage(err, "error opening index")
}
batch := index.NewBatch()
var docs sync.Map
jsonFile, err := os.Open(path.Join("data", "processed", kind+".json"))
if err != nil {
return nil, errors.WithMessage(err, "error opening json file")
}
dec := jstream.NewDecoder(jsonFile, 1)
var opt options.NixOption
ms, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
ErrorUnused: true,
ZeroFields: true,
Result: &opt,
})
if err != nil {
return nil, errors.WithMessage(err, "could not create struct decoder")
}
for mv := range dec.Stream() {
opt = options.NixOption{}
err := ms.Decode(mv.Value) // stores in opt
if err != nil {
return nil, errors.WithMessagef(err, "could not decode object into option, object: %#v", mv.Value)
}
docs.Store(opt.Option, opt)
err = batch.Index(opt.Option, opt)
if err != nil {
return nil, errors.WithMessagef(err, "could not index option %s", opt.Option)
}
}
err = index.Batch(batch)
if err != nil {
return nil, errors.WithMessage(err, "failed to run batch index operation")
}
return &Index[T]{
index,
&docs,
}, nil
}
func (index *Index[T]) Search(ctx context.Context, keyword string, from uint64) (*Result[T], error) {
query := bleve.NewMatchQuery(keyword)
query.Analyzer = "option_name"
search := bleve.NewSearchRequest(query)
search.Size = ResultsPerPage
if from != 0 {
search.From = int(from)
}
bleveResult, err := index.index.SearchInContext(ctx, search)
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
if err != nil {
return nil, errors.WithMessage(err, "failed to execute search query")
}
results := make([]T, min(ResultsPerPage, bleveResult.Total))
for i, result := range bleveResult.Hits {
doc, _ := index.docs.Load(result.ID)
results[i] = doc.(T)
}
return &Result[T]{
bleveResult,
results,
}, nil
}
}
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