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package index
import (
"bytes"
"context"
"encoding/gob"
"go.alanpearce.eu/searchix/internal/config"
"go.alanpearce.eu/searchix/internal/nix"
"go.alanpearce.eu/x/log"
"github.com/blevesearch/bleve/v2"
"github.com/blevesearch/bleve/v2/analysis/analyzer/standard"
"github.com/blevesearch/bleve/v2/search"
"github.com/blevesearch/bleve/v2/search/query"
"github.com/pkg/errors"
)
const ResultsPerPage = 20
type DocumentMatch struct {
*search.DocumentMatch
Data nix.Importable
}
type Result struct {
*bleve.SearchResult
Hits []DocumentMatch
}
type ReadIndex struct {
index bleve.Index
log *log.Logger
meta *Meta
}
func (index *ReadIndex) GetEnabledSources() ([]string, error) {
facet := bleve.NewFacetRequest("Source", 100)
query := bleve.NewMatchAllQuery()
search := bleve.NewSearchRequest(query)
search.AddFacet("Source", facet)
results, err := index.index.Search(search)
if err != nil {
return nil, errors.WithMessage(err, "could not get list of enabled sources from index")
}
enabledSources := make([]string, results.Facets["Source"].Terms.Len())
for i, term := range results.Facets["Source"].Terms.Terms() {
enabledSources[i] = term.Term
}
return enabledSources, nil
}
func (index *ReadIndex) GetSource(
ctx context.Context,
source *config.Source,
) (*bleve.SearchResult, error) {
var query query.Query
if source == nil {
query = bleve.NewMatchAllQuery()
} else {
tq := bleve.NewTermQuery(source.Name)
tq.SetField("Source")
query = tq
}
search := bleve.NewSearchRequest(query)
result, err := index.index.SearchInContext(ctx, search)
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
if err != nil {
return nil, errors.WithMessagef(
err,
"failed to execute search to find source %s in index",
source,
)
}
}
return result, nil
}
func setField(
q query.FieldableQuery,
field string,
) query.FieldableQuery {
q.SetField(field)
return q
}
func (index *ReadIndex) search(
ctx context.Context,
request *bleve.SearchRequest,
) (*Result, error) {
request.Fields = []string{"_data", "Source"}
bleveResult, err := index.index.SearchInContext(ctx, request)
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
if err != nil {
return nil, errors.WithMessage(err, "failed to execute search query")
}
results := make([]DocumentMatch, bleveResult.Hits.Len())
var buf bytes.Buffer
for i, result := range bleveResult.Hits {
results[i].DocumentMatch = bleveResult.Hits[i]
_, err = buf.WriteString(result.Fields["_data"].(string))
if err != nil {
return nil, errors.WithMessage(err, "error fetching result data")
}
err = gob.NewDecoder(&buf).Decode(&results[i].Data)
if err != nil {
return nil, errors.WithMessagef(err, "error decoding gob data: %s", buf.String())
}
buf.Reset()
}
return &Result{
SearchResult: bleveResult,
Hits: results,
}, nil
}
}
func (index *ReadIndex) Search(
ctx context.Context,
source *config.Source,
keyword string,
from uint64,
) (*Result, error) {
query := bleve.NewBooleanQuery()
// match the user's query in any field ...
userQuery := bleve.NewMatchQuery(keyword)
userQuery.Analyzer = "option_name"
if source != nil {
query.AddMust(
setField(bleve.NewTermQuery(source.Key), "Source"),
userQuery,
)
}
// ...and boost it if it matches any of these
query.AddShould(
setField(bleve.NewMatchQuery(keyword), "MainProgram"),
setField(bleve.NewMatchQuery(keyword), "Name"),
setField(bleve.NewMatchQuery(keyword), "Attribute"),
)
query.AddShould(
setField(bleve.NewMatchQuery(keyword), "Loc"),
setField(bleve.NewMatchQuery(keyword), "Name"),
)
nameLiteralQuery := bleve.NewMatchQuery(keyword)
nameLiteralQuery.SetField("Name")
nameLiteralQuery.Analyzer = standard.Name
query.AddShould(nameLiteralQuery)
search := bleve.NewSearchRequest(query)
search.Size = ResultsPerPage
if from != 0 {
search.From = int(from)
}
return index.search(ctx, search)
}
func (index *ReadIndex) GetDocument(
ctx context.Context,
source *config.Source,
id string,
) (*nix.Importable, error) {
key := nix.MakeKey(source, id)
query := bleve.NewDocIDQuery([]string{key})
search := bleve.NewSearchRequest(query)
result, err := index.search(ctx, search)
if err != nil {
return nil, err
}
if result.Total == 0 {
return nil, nil
}
return &result.Hits[0].Data, err
}
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