mirror of
https://github.com/0ceanSlim/grain.git
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67 lines
2.3 KiB
Go
67 lines
2.3 KiB
Go
package kinds
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import (
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"context"
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"fmt"
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"grain/server/handlers/response"
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relay "grain/server/types"
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"go.mongodb.org/mongo-driver/bson"
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"go.mongodb.org/mongo-driver/mongo"
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"go.mongodb.org/mongo-driver/mongo/options"
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"golang.org/x/net/websocket"
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)
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// HandleParameterizedReplaceableKind handles parameterized replaceable events based on NIP-01 rules
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func HandleParameterizedReplaceableKind(ctx context.Context, evt relay.Event, collection *mongo.Collection, ws *websocket.Conn) error {
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// Step 1: Find dTag from the event's tags
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var dTag string
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for _, tag := range evt.Tags {
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if len(tag) > 0 && tag[0] == "d" {
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dTag = tag[1]
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break
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}
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}
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// Step 2: Create filter to find the existing event based on pubkey, kind, and dTag
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filter := bson.M{"pubkey": evt.PubKey, "kind": evt.Kind, "tags.d": dTag}
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// Step 3: Find the existing event from the database
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var existingEvent relay.Event
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err := collection.FindOne(ctx, filter).Decode(&existingEvent)
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if err != nil && err != mongo.ErrNoDocuments {
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return fmt.Errorf("error finding existing event: %v", err)
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}
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// Step 4: Handle event replacement logic (NIP-01 rules)
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// If we found an existing event and the new event is older, reject the update
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if err != mongo.ErrNoDocuments {
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if existingEvent.CreatedAt > evt.CreatedAt || (existingEvent.CreatedAt == evt.CreatedAt && existingEvent.ID < evt.ID) {
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response.SendOK(ws, evt.ID, false, "blocked: relay already has a newer event for this pubkey and dTag")
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return nil
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}
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// Step 5: Delete the older event if the new event is valid
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_, err := collection.DeleteOne(ctx, bson.M{"_id": existingEvent.ID})
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if err != nil {
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return fmt.Errorf("error deleting the older event: %v", err)
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}
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fmt.Printf("Deleted older event with ID: %s\n", existingEvent.ID)
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}
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// Step 6: Upsert the new event (insert if not existing, or update if newer)
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opts := options.Update().SetUpsert(true)
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update := bson.M{
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"$set": evt,
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}
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_, err = collection.UpdateOne(ctx, filter, update, opts)
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if err != nil {
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response.SendOK(ws, evt.ID, false, "error: could not connect to the database")
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return fmt.Errorf("error updating/inserting event kind %d into MongoDB: %v", evt.Kind, err)
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}
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fmt.Printf("Upserted event kind %d into MongoDB: %s\n", evt.Kind, evt.ID)
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response.SendOK(ws, evt.ID, true, "")
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return nil
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}
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