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52 lines
2.3 KiB
Markdown
52 lines
2.3 KiB
Markdown
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---
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outline: deep
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---
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# Implementing NIP-50 `search` support
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The [`nostr.Filter` type](https://pkg.go.dev/github.com/nbd-wtf/go-nostr#Filter) has a `Search` field, so you basically just has to handle that if it's present.
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It can be tricky to implement fulltext search properly though, so some [eventstores](eventstore) implement it natively, such as [Bluge](https://pkg.go.dev/github.com/fiatjaf/eventstore/bluge), [OpenSearch](https://pkg.go.dev/github.com/fiatjaf/eventstore/opensearch) and [ElasticSearch](https://pkg.go.dev/github.com/fiatjaf/eventstore/elasticsearch) (although for the last two you'll need an instance of these database servers running, while with Bluge it's embedded).
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If you have any of these you can just use them just like any other eventstore:
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```go
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func main () {
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// other stuff here
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normal := &lmdb.LMDBBackend{Path: "data"}
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os.MkdirAll(normal.Path, 0755)
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if err := normal.Init(); err != nil {
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panic(err)
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}
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search := bluge.BlugeBackend{Path: "search", RawEventStore: normal}
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if err := search.Init(); err != nil {
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panic(err)
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}
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relay.StoreEvent = append(relay.StoreEvent, normal.SaveEvent, search.SaveEvent)
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relay.QueryEvents = append(relay.QueryEvents, normal.QueryEvents, search.QueryEvents)
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relay.DeleteEvent = append(relay.DeleteEvent, normal.DeleteEvent, search.DeleteEvent)
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// other stuff here
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}
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```
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Note that in this case we're using the [LMDB](https://pkg.go.dev/github.com/fiatjaf/eventstore/lmdb) adapter for normal queries and it explicitly rejects any filter that contains a `Search` field, while [Bluge](https://pkg.go.dev/github.com/fiatjaf/eventstore/bluge) rejects any filter _without_ a `Search` value, which make them pair well together.
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Other adapters, like [SQLite](https://pkg.go.dev/github.com/fiatjaf/eventstore/sqlite3), implement search functionality on their own, so if you don't want to use that you would have to have a middleware between, like:
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```go
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relay.StoreEvent = append(relay.StoreEvent, db.SaveEvent, search.SaveEvent)
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relay.QueryEvents = append(relay.QueryEvents, func (ctx context.Context, filter nostr.Filter) (chan *nostr.Event, error) {
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if len(filter.Search) > 0 {
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return search.QueryEvents(ctx, filter)
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} else {
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filterNoSearch := filter
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filterNoSearch.Search = ""
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return normal.QueryEvents(ctx, filterNoSearch)
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}
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})
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```
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