moved back to a single db writer

pkg/pipe/engine.go

@@ -24,9 +24,6 @@ type EngineConfig struct {
 	// GraphBuilder params
 	BuilderCapacity int
 	CacheCapacity   int
-
-	// Archiver params
-	Archivers int
 }
 
 func NewEngineConfig() EngineConfig {
@@ -34,7 +31,6 @@ func NewEngineConfig() EngineConfig {
 		PrintEvery:      5000,
 		BuilderCapacity: 1000,
 		CacheCapacity:   100_000,
-		Archivers:       4,
 	}
 }
 
@@ -56,8 +52,10 @@ func Engine(
 	graphEvents := make(chan *nostr.Event, config.BuilderCapacity)
 	defer close(graphEvents)
 
-	go GraphBuilder(ctx, config, db, graphEvents)
 	log.Println("Engine: ready to process events")
+	defer log.Println("Engine: shutting down...")
+
+	go GraphBuilder(ctx, config, db, graphEvents)
 
 	Archiver(ctx, config, store, events, func(e *nostr.Event) error {
 		if e.Kind == nostr.KindFollowList {
@@ -69,8 +67,6 @@ func Engine(
 		}
 		return nil
 	})
-
-	log.Println("Engine: shutting down...")
 }
 
 // Archiver stores events in the event store.
@@ -81,7 +77,6 @@ func Archiver(
 	events chan *nostr.Event,
 	onReplace func(*nostr.Event) error) {
 
-	sem := make(chan struct{}, config.Archivers)
 	var processed int
 
 	for {
@@ -94,16 +89,34 @@ func Archiver(
 				return
 			}
 
-			sem <- struct{}{}
-			go func() {
-				err := archive(ctx, store, event, onReplace)
-				<-sem
+			err := func() error {
+				opctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+				defer cancel()
 
-				if err != nil {
-					log.Printf("Archiver: event ID %s, kind %d by %s: %v", event.ID, event.Kind, event.PubKey, err)
+				switch {
+				case nostr.IsRegularKind(event.Kind):
+					return store.Save(opctx, event)
+
+				case nostr.IsReplaceableKind(event.Kind):
+					replaced, err := store.Replace(opctx, event)
+					if err != nil {
+						return err
+					}
+
+					if replaced {
+						return onReplace(event)
+					}
+					return nil
+
+				default:
+					return nil
 				}
 			}()
 
+			if err != nil {
+				log.Printf("Archiver: event ID %s, kind %d by %s: %v", event.ID, event.Kind, event.PubKey, err)
+			}
+
 			processed++
 			if processed%config.PrintEvery == 0 {
 				log.Printf("Archiver: processed %d events", processed)
@@ -112,36 +125,6 @@ func Archiver(
 	}
 }
 
-// Archive an event based on its kind.
-func archive(
-	ctx context.Context,
-	store *eventstore.Store,
-	event *nostr.Event,
-	onReplace func(*nostr.Event) error) error {
-
-	ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
-	defer cancel()
-
-	switch {
-	case nostr.IsRegularKind(event.Kind):
-		return store.Save(ctx, event)
-
-	case nostr.IsReplaceableKind(event.Kind):
-		replaced, err := store.Replace(ctx, event)
-		if err != nil {
-			return err
-		}
-
-		if replaced {
-			return onReplace(event)
-		}
-		return nil
-
-	default:
-		return nil
-	}
-}
-
 // GraphBuilder consumes events to update the graph and random walks.
 func GraphBuilder(
 	ctx context.Context,