nip77: simplify direction selection.

nip77/example/example.go

@@ -45,7 +45,7 @@ func main() {
 		}
 
 		err := nip77.NegentropySync(ctx,
-			local, "ws://localhost:7777", nostr.Filter{})
+			local, "ws://localhost:7777", nostr.Filter{}, nip77.Both)
 		if err != nil {
 			panic(err)
 		}

nip77/nip77.go

@@ -17,7 +17,21 @@ type direction struct {
 	target nostr.RelayStore
 }
 
-func NegentropySync(ctx context.Context, store nostr.RelayStore, url string, filter nostr.Filter, d string) error {
+type Direction int
+
+const (
+	Up   = 0
+	Down = 1
+	Both = 2
+)
+
+func NegentropySync(
+	ctx context.Context,
+	store nostr.RelayStore,
+	url string,
+	filter nostr.Filter,
+	dir Direction,
+) error {
 	id := "go-nostr-tmp" // for now we can't have more than one subscription in the same connection
 
 	data, err := store.QuerySync(ctx, filter)
@@ -80,13 +94,13 @@ func NegentropySync(ctx context.Context, store nostr.RelayStore, url string, fil
 	pool := newidlistpool(50)
 
 	// Define sync directions
-	directions := map[string][]direction{
+	directions := [][]direction{
-		"up":   {{"up", neg.Haves, store, r}},
+		{{"up", neg.Haves, store, r}},
-		"down": {{"down", neg.HaveNots, r, store}},
+		{{"down", neg.HaveNots, r, store}},
-		"both": {{"up", neg.Haves, store, r}, {"down", neg.HaveNots, r, store}},
+		{{"up", neg.Haves, store, r}, {"down", neg.HaveNots, r, store}},
 	}
 
-	for _, dir := range selectDir(directions, d) {
+	for _, dir := range directions[dir] {
 		wg.Add(1)
 		go func(dir direction) {
 			defer wg.Done()
@@ -141,15 +155,3 @@ func NegentropySync(ctx context.Context, store nostr.RelayStore, url string, fil
 
 	return nil
 }
-
-// selectDir returns the directions to sync based on the user input
-func selectDir(directions map[string][]direction, d string) []direction {
-	switch d {
-	case "up":
-		return directions["up"]
-	case "down":
-		return directions["down"]
-	default:
-		return directions["both"]
-	}
-}