mirror of
https://github.com/0ceanSlim/grain.git
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61 lines
2.1 KiB
Go
61 lines
2.1 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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"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: Extract the 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 a 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": bson.M{"$elemMatch": bson.M{"0": "d", "1": dTag}}}
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// Step 3: Check if an existing event is found
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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: If an existing event is found, compare created_at and id to decide if it should be replaced
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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 before inserting the new one
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_, err := collection.DeleteOne(ctx, filter)
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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: Insert the new event (without upsert since we already deleted the old one)
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_, err = collection.InsertOne(ctx, evt)
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if err != nil {
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response.SendOK(ws, evt.ID, false, "error: could not insert the new event into the database")
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return fmt.Errorf("error inserting event kind %d into MongoDB: %v", evt.Kind, err)
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}
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fmt.Printf("Inserted 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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